What is metal galvanization

Metal galvanizing ⛓❗

what is galvanizing metal

Metal galvanizing is a process during which the product is treated with zinc, molten to high temperatures. Thanks to the technique, the output is a product with excellent strength characteristics that is not subject to corrosion. It is important that the technique is carried out by experienced specialists who will competently prepare the metal alloy and its subsequent processing with zinc in accordance with norms and standards.

Hot dip galvanizing, also known as dip galvanizing, is the process of applying a zinc coating by immersing a steel structure in a bath of molten zinc. Before being immersed in a zinc bath, the steel is chemically cleaned to remove oils, grease and oxides. Surface preparation is critical so that the zinc will not react with contaminated steel.

After preparing the surface before galvanizing, the steel is immersed in a bath of molten (450 °C) zinc. The melt consists of more than 98% pure zinc, with the remaining 2% or less being additives - typically aluminum, nickel and bismuth.

These additives help with zinc fluidity and optimize zinc intake, improve coating appearance, and provide other benefits.

When the product is immersed in a bath, the molten zinc reacts chemically with the iron in the steel to form a zinc coating.

How hot-dip galvanizing is performed: stages

As mentioned above, galvanizing a metal consists of several successive stages - preparation and direct processing with a zinc alloy. The surface that will be subjected to galvanizing is carefully prepared, and the galvanizing process itself is carried out in accordance with GOST 9.307-89.

The technology requires special conditions, devices and experience. According to GOST, the methodology consists of the following sequential points:

  1. alloy machining;
  2. degreasing the surface of the part;
  3. washing and etching;
  4. fluxing and drying.

More about the stages

At the mechanical treatment , it is possible to remove various contaminants from the surface, as well as oxidation products, rust stains, and various types of slag deposits. It is important to remember that according to GOST it is mandatory to round corners and edges. At this stage, professionals use modern sandblasting machines.

Degreasing of metal structures is carried out at a temperature of 70-75 degrees. It is this stage that provides the product with excellent adhesion to hot zinc. If greasy marks remain on the surface, then there is a huge risk that the zinc in these places will peel off. Full degreasing is impossible without chemicals prescribed by GOST. To remove these substances from the surface of the product, the technology of washing the structure is used.

Etching is another equally important point, during which oxidized areas are removed, as well as the old coating layer. When etching, a mixture of hydrochloric acid is used. To perform the technique, a temperature of up to 24 degrees is required. As for the concentration of the substance, everything will depend on how much contaminants are present on the metal product.

For the etching technique, compositions with an acid content of up to 200 grams per liter are taken. During the etching process, an acid solution can harm the product, and therefore it is important to reduce hydrogen in the etching mixture. For this purpose, professionals use inhibitors. After etching, another wash follows to remove any remaining chemicals, and then the product is coated with hot zinc. For this purpose, special baths with hot zinc composition are used.

The resulting product boasts excellent strength characteristics. For many years, rust stains and no traces of corrosion appear on the structure. In addition, a structure that has undergone a galvanizing procedure does not require repainting.

Hot dip galvanizing

Hot zinc coating is applied to many types of metal structures in countless construction sectors from electrical products to artistic sculptures.

Ranging in size from small parts such as nuts, bolts and nails to large structural forms, galvanizing is an integral part of many industries in Russia and contributes to improved infrastructure.

Most often, hot-dip galvanizing is used to coat metal exposed to negative weather conditions; however, it is also used for products in fresh and salt water, submerged in soil, embedded in concrete, and many other applications.

Product size can be a barrier to hot dip galvanizing; however, the length of the galvanizing bath is 13 meters, and its width and depth are 1.5 and 3 meters, respectively, and allows the processing of large-sized products.

If you have any questions, you can ask our specialists!

Metal galvanization

The active use of metals raises the issue of their reliable anti-corrosion protection. Its correct solution will extend its service life by decades. The most common and effective method is galvanizing the metal. Its essence is the application of a composition containing about 95% zinc to a metal surface. There are several varieties of the method, which have both advantages and disadvantages.

Improved performance

The service life of steel products is significantly reduced if they are used in a humid environment or negative atmospheric conditions. By applying a zinc layer to the metal, you can protect it from all negatives for a long time.

Substantiating this effect with the help of science, it is worth saying that it is based on the galvanization process - steel and zinc form a pair in which it is the coating material that has an electronegative charge. This layer produces not only a mechanical barrier effect, but also chemical neutrality, without reacting with acids, alkalis, etc.

The durability of the material will be at a level up to the complete destruction of the layer. Performance indicators after galvanizing the metal increase several times, and the cost of the procedure pays off several times.

Types of procedure

There are five main galvanizing methods in modern industry:

  1. hot;
  2. cold;
  3. gas-thermal;
  4. thermal diffusion;
  5. galvanic.

They are selected taking into account the environment of future use, conditions and required characteristics. Galvanizing options have different thicknesses of the applied layer, due to different technological processes: temperature conditions and exposure time.

In order for the processing to be carried out efficiently with a long-lasting result, you need to consistently perform the preparatory steps:

  • degreasing, cleaning;
  • treatment with acid solutions, etching;
  • fluxing and washing after all previous stages;
  • drying.

The treated metal does not lose its performance for decades, allowing you to forget about corrosion prevention. The new coating interacts well with other paint and varnish coatings, which makes it possible to carry out additional anti-corrosion treatment on already galvanized metal. Manufacturers provide a multi-year warranty on products, no matter how they are covered.

Steel galvanizing

The popularity of zinc coating for protecting metal from corrosion is due to the high resistant qualities of the material. Galvanizing steel makes the metal an ideal option for use in manufacturing, roofing, vehicles, and construction. The resulting product is characterized by its lightness, reliability, durability, and ability to withstand an aggressive external environment.

Manufacturing process

To process an ordinary sheet of steel with zinc, it is necessary to use modern equipment for steel coils so that the output is a product that meets all national quality standards.

Having gone through the preparatory stages, the steel coil is placed in a continuous galvanizing machine, where the process of direct coating with liquid zinc takes place. During the process, the temperature and speed of the workpiece are regulated.

Upon completion of the procedure, a smooth profile sheet is obtained, suitable for further use in the manufacture of other parts. Depending on the technology used for galvanizing steel, there are several types of process:

  1. cold stamping;
  2. general purpose;
  3. cold polishing;
  4. subject to further coloring.

It is this classification that makes it possible to divide the processed material into grades.

Application area

Galvanized steel is used in many areas of human economic activity:

  • production of rolled pipes, roofing elements, fencing;
  • automotive industry;
  • instrument making.

The use of such steel for roofing needs is especially significant. Corrugated sheeting, this is the name given to galvanized roofing material, is strong, reliable and durable, able to withstand high humidity and temperature changes. And the cost-effectiveness of using this option is obvious, thanks to the cost, which is lower than that of most modern materials.

When buying steel, you should pay attention to the treated surface, or more precisely to its quality - it should be smooth and without mechanical damage.

Whatever the method of galvanized metal, its anti-corrosion properties are preserved for many years, no matter the conditions in which it is used. Galvanizing steel is one of the most effective methods of extending the service life of rolled metal products.

Source: https://oooecm.ru/zashchita-metalla/

Galvanized rolled metal - application and advantages

what is galvanizing metal

Metals treated with zinc are considered the most durable products. This fact is due to the anti-corrosion properties of the zinc coating.

In this regard, galvanized metal products are economical to use, as they have a fairly long service life.

The price for additional processing pays off many times over time, because zinc-coated products can last for a long period of time without any costs for additional processing and maintenance.

Where is galvanized metal used?

Products with zinc protection can be used in various fields of industry and construction. They are indispensable when installing metal structures and are used for arranging roofing structures, fences, decking, fences, etc. Galvanized metal products are in great demand in the construction of urban infrastructure.

Advantages of galvanized products

Galvanized metal products are very popular in all areas of industry and construction due to their unique properties. We list only a small fraction of the advantages of products with zinc coating:

  1. The most important advantage is the high level of corrosion resistance. Products coated with zinc can retain their original appearance from 30 to 120 years.
  2. A durable protective barrier against adverse environmental conditions. Zinc coating is not afraid of pronounced temperature changes, contact with moisture, or mechanical stress.
  3. Cost savings on galvanized products. The price per ton of rolled metal with zinc coating is significantly lower than the cost of products made from other materials with the same positive characteristics.
  4. Low thermal conductivity. This property of metals is especially appreciated when equipping roofs, professional flooring, and house panels.
  5. Impeccable appearance. With cold galvanizing, you can give the product a noble material and decorative effect. You can choose any shade of galvanization so that the coating looks most advantageous and acquires decorative properties.

How does the galvanizing process of metals take place?

Today, galvanizing metal products involves two methods: cold and hot.

Hot-dip galvanizing occurs using molten zinc. Products undergo special processing:

  • At the initial stage, the structures are cleaned and degreased with special solutions. Metals can be cleaned using sandblasting.
  • Next, the products are washed in large baths - galvanizing tanks.
  • After washing, an etching process follows to remove all oxides for better bonding of the zinc to the metal surface.
  • The product is washed again to remove chemicals.
  • Rolled metal is fluxed.
  • The final stage of pre-treatment involves drying the products.

After the preparatory procedures, direct hot-dip galvanizing begins. Products are immersed in molten zinc at a temperature of 460 degrees. The thickness of the coating depends on the speed at which the metals are immersed in the hot mixture. Next, the products are removed from the baths and cooled using a diffuser method. The output is metals with a stable protective coating.

It is noteworthy that zinc has the ability to self-heal. This means that the damage heals every year. This process continues until the zinc coating completely disappears down to the last atom. Hot-processed zinc coating can last for 120 years under normal conditions.

Cold galvanizing is the simplest and most affordable method for protecting metals from corrosion. The only drawback of this processing method is that it is impossible to obtain the same thick layer of zinc as with hot-dip galvanizing. The basic principle of cold application of zinc is the coating of metals with special compounds, with the highest percentage of zinc-containing mixture - up to 95%.

buy galvanized rolled metal in Moscow from our company. The prices will please you.

Delivery is carried out to many Russian cities and regions, including the following:

  • Ekaterinburg
  • Chelyabinsk
  • Pervouralsk
  • Tyumen
  • Mound
  • Nizhny Tagil
  • Serov
  • Permian
  • Tobolsk
  • Surgut
  • Khanty-Mansiysk
  • Ufa
  • Izhevsk
  • Kazakhstan

You may also be interested in the following articles:

Source: https://ECM-zink.ru/info/stati/oczinkovannyij-metalloprokat-primenenie-i-preimushhestva.html

Galvanized sheet: technical characteristics and scope of application

what is galvanizing metal

Galvanized sheet is a metal product for the production of which cold-rolled (less commonly, pickled hot-rolled) coiled or sheet steel is used. A protective zinc layer is applied to the steel base. Galvanizing provides not only barrier (similar to paint and varnish materials), but also electrochemical protection of rolled steel from corrosion. The protective layer, depending on the chemical composition and method of application, may have different thickness, appearance, and performance characteristics.

Types and main characteristics of coatings

GOST R 52246-2016 under the concept of “galvanized rolled products” combines products with the following types of coating:

  • Zinc (Z) . Galvanizing is carried out in several ways - hot, galvanic, thermal diffusion. For local processing of individual areas, cold galvanizing is used. In the mass production of galvanized sheets, the most commonly used method is hot-dip galvanizing, carried out in baths of molten zinc. A high-performance process is the processing of rolled products on continuous lines.
  • Iron-zinc (ZZ) . This coating is obtained by annealing rolled steel with a coating that contains up to 12% Fe. The surface is gray, matte, there is no crystallization pattern. Variety – iron-zinc tempered (ZZD). This coating is obtained by cold deformation of rolled products with an iron-zinc layer in a temper mill. It is usually used as a basis for subsequent decorative processing. The surface has a specified roughness value.
  • Zinc aluminum (CA) . Resistant to corrosion and high temperatures. This coating combines the ductility of aluminum and the corrosion resistance of zinc.
  • Zinc-aluminum-magnesium (ZAM) . The composition of the melt into which the steel sheet is immersed, in addition to zinc and aluminum, includes magnesium.

The corrosion resistance of zinc coating increases with increasing thickness, but the risk of zinc peeling during stamping or bending increases. The thickness of the protective layer is characterized by its class. High classes are used for products that will not be coated with a coloring layer.

Table of coating classes according to GOST R 52246-2016

Class Coating weight on both sides, average for three samples, not less, g/m2 Coating thickness on one side, average for three samples, not less, microns Coverage class Coating weight on both sides, average for three samples, not less, g/m2
Zinc and iron-zinc Zinc-aluminum
60 60 4,2 60 60
80 80 5,6 80 80
100 100 7,0 95 95
120 120 8,4 130 130
140 140 9,8 185 185
180 180 12,6 200 200
200 200 14,0 255 255
225 225 15,8 300 300
275 275 19,3
350 350 24,5
450 450 31,6
600 600 42,0

Technical characteristics of galvanized sheet

Zinc coatings for steel sheets make up approximately 60% of all metal protective layers used in the national economy. Not only sheet metal is galvanized, but also pipes, shaped steel, fasteners, wire, parts of machine tools, automated lines, machines and mechanisms. This method has gained wide popularity among metal product manufacturers due to the complex of positive properties of the protective layer, including:

  • Elasticity . Galvanized sheets and rolls are capable of drawing, rolling, and bending.
  • Freshly deposited zinc coating can be easily soldered using acid-free fluxes.
  • Zinc is an active metal that has a more negative electrical potential compared to iron, therefore it is zinc that reacts with aggressive solutions, protecting the steel base from destruction . In conditions of high humidity, zinc reacts with carbon dioxide and sulfur compounds in the air to form a thin film of zinc hydroxides and carbonates.
THIS IS INTERESTING:  What is silver rhodium plating

At temperatures above 0°C, zinc in relation to iron changes the type of protection from anodic to cathodic, which leads to the preservation of the zinc layer and rapid corrosion of the steel base. Therefore, galvanized sheets are not used for operation at temperatures above 0°C.

The protective properties of zinc also sharply decrease in the atmosphere with organic compounds - chlorine-containing hydrocarbons, vapors of synthetic resins and other substances. The destruction of the coating is caused by the proximity of galvanized rolled steel to freshly painted or oil-treated products and structures.

To increase the resistance of the zinc layer to such atmospheres, it is treated with solutions of chromic acid or its salts, as well as salts of phosphoric acid.

The colors of the zinc coating range from gray to light gray. Over time, the surface darkens and becomes dull. The phosphated coating has colors ranging from dark to light gray; the crystalline structure of the phosphate film is visible on the surface.

The corrosion resistance and aesthetics of sheets and other types of rolled products can be improved by chromating. In this case, the surface acquires colors from golden yellow to yellow-green. The brownish color in this case is a sign of marriage.

Range of galvanized sheets

In accordance with GOST R 52246-2016, products are produced in the following sizes:

  • sheet width – 0.7-1.8 m;
  • roll width – 0.5-1.8 m;
  • the thickness of the base with the thickness of the protective layer is 0.3-4.5 mm.

Areas of application of galvanized steel

In GOST R 52264-2016, galvanized sheets are divided into grades according to their intended purpose:

  • 01 – flat and curved products;
  • 02 – tableware products obtained by bending and joining into a lock;
  • 03 – deep-drawn stamped parts and profiles of complex configuration;
  • 04, 05, 06 - products made accordingly by complex, particularly complex, very particularly complex drawing;
  • 07 – products in the production of which particularly deep drawing was used;
  • 220, 250, 280, 320, 350, 390, 420, 450 – profiled sheets in demand in construction.

The most common area of ​​application of galvanized sheets is the production of corrugated sheets, metal products used, depending on the brand, as roofing material, for the construction of fences, wall cladding, and in the manufacture of multilayer (“sandwich”) panels. Flat sheets are in demand for the manufacture of additional elements of roof structures - ridges, abutments, gutters and pipes, and finishing of gables.

Source: https://navigator-beton.ru/articles/list-otsinkovannyj-harakteristiki.html

Metal galvanizing: technology and methods

Many methods and methods have been created to protect metal from corrosion. Their essence lies in the fact that a special substance is applied to the surface of the metal. At the final stage, a thin film is formed. It prevents moisture, oxygen, and aggressive substances from entering the surface. Among these methods, metal galvanizing is distinguished. It is the most effective.

General information

As mentioned earlier, galvanizing a metal is the process of applying a special substance to the surface of a product. Such solutions are created on the basis of zinc, which is the most suitable starting material. It prevents corrosion and also protects the surface from aggressive substances. The processed sheet has a number of advantages:

  • the strength of the product increases;
  • resistance to different temperatures;
  • not exposed to aggressive substances;
  • the service life of the product increases;
  • the product is not subject to oxidation.

Technological basis

Galvanizing of metal is a popular procedure all over the world. This process involves applying a special zinc solution to the steel surface. After this, a thin film is formed, which performs protective functions, that is, it prevents corrosion. Corrosion changes the structure of the metal and renders the product unusable.

As mentioned earlier, products are affected by moisture, as well as oxygen and aggressive substances. Their molecules enter the deep structure of the metal, which leads to the appearance of rust. As a result, holes appear on the surface. This process can take a long time. To slow down the oxidation process, use a zinc solution.

Stages

Galvanizing of metal involves covering various types of products with a protective zinc film. To perform this procedure, you must have special equipment. Each element of the device should not be exposed to moisture or aggressive substances. The galvanizing process is divided into the following stages:

  1. Preparatory. First of all, you need to put the product in order. Its surface must be cleaned of various substances and then degreased. Next comes the etching process. The metal product is lowered into a container with an acidic medium. As a rule, a solution of sulfuric acid is used. Due to metal etching, an oxide film appears on the surface. This means that the zinc solution will last longer. At the final stage, acid residues are removed from the product and dried.
  2. Galvanizing process. This stage consists of applying a solution to the prepared surface. To make it, you need to melt zinc in a special bath under high temperature. When the solution is ready, a metal product is immersed in the bath and left for several minutes.
  3. Drying the product. The galvanized product is dried at room temperature.

The process of galvanizing metal products occurs in special baths.

If necessary, they are equipped with sockets. Despite their significant volumes, they also process a large number of small items. Thus, equipment for galvanizing metal and hardware can have not only small, but also large sizes.

Basic processing methods

The most popular way to protect metal products from corrosion is galvanizing. There are different ways to do this process. Each of them is used for a specific type of metal. Some species may react with zinc. There are four types of processing: hot, cold, thermal diffusion, galvanic. Let's look at each type in more detail.

Hot

Coating products in this way is popular in many countries. Its main positive properties are high quality and long service life. Therefore, this method has become one of the best. There are also a number of negative properties.

First of all, the method is not environmentally friendly, since many chemicals are used at the preparation and galvanizing stage. In addition, there is a significant difficulty in hot working. It is necessary to maintain the temperature of zinc in the range from 500 to 5000ºС.

Maintaining this level of heating requires a lot of electricity. Hot galvanizing metal at home is a rather complex process.

Technologically, the process is divided into two stages. This is the preparation and galvanizing of metal. At the first stage, they prepare the metal product. Its surface must be degreased and cleared of debris. After this, etching, washing and drying occurs.

These operations are prescribed in regulatory documentation.

To coat a part with zinc, you need to immerse it in a special bath. It contains a special solution that prevents corrosion. Methods for fixing metal during hot-dip galvanizing can be different. They depend on the type and shape of the product. This technology is used in many industries. For example, for the production of galvanized wire, pipes, etc.

After applying the hot method to them, the products have a long service life, that is, they are reliably protected from corrosion. The only difficulty is the baths. To process large parts, it is necessary to find a bath of appropriate volumes, which is quite difficult.

This feature affects costs. Where is hot galvanizing of metal performed? Kursk, Moscow, Chelyabinsk, Yaroslavl - this is just a small list of cities where various companies offer this service. Often they work with large volumes.

Galvanic galvanizing of metal - technology

This method is used when processing a smooth surface is necessary. The technology of galvanizing metal by galvanic method is based on fixing the substance to the surface of the product due to electrochemical action. This method is suitable for absolutely all types of metal. The product receives a uniform shiny coating. This occurs due to the fusion of the metal coating and zinc.

This interaction is affected by the presence of various debris or other films on the surface. Therefore, before starting the procedure, you should do some cleaning. In mass production, it is difficult to monitor this, so galvanizing may be of poor quality.

The galvanic method is based on immersing a metal product in a bath containing an electrolyte solution. A current source is connected to the part. In this case, the process of electrolysis occurs. It is exposed to zinc, which coats the metal part.

pros

The main positive quality is the appearance of the product - the surface is smooth and shiny. However, there is also a significant drawback. Before draining the solution that was in the bathroom, it is necessary to clean it of zinc. This method generates a large amount of waste that is harmful to the environment. Therefore, it is necessary to purchase special expensive equipment. It will release zinc from the solution. Therefore, this method is one of the most expensive.

This procedure is used by many craftsmen when it is necessary to process small parts. First you need to find a suitable container and make an electrolyte. The procedure is carried out in a well-ventilated area and in protective clothing, since electrolyte particles can be harmful to humans. If they come into contact with the skin, a chemical burn is possible.

To prepare, take water, zinc sulphide, magnesium and vinegar. The finished concentrate must be filtered. Next, the metal part is lowered into the container and the anode product is prepared. A copper wire is attached to a small piece of zinc and connected to the electrical network. The product is lowered into the electrolyte and the processing process begins. After this, the metal part is dried.

Galvanizing metal at home is quite easy to do.

Features of the cold method

Over the past few years, this method has become widespread. Its essence lies in the fact that a metal product is painted with special substances that contain zinc. This method does not require any special skills. However, there are also disadvantages: finished galvanized products are subject to mechanical stress.

In addition, it is necessary to constantly monitor the technical personnel who prepare the solution and perform the work. As mentioned earlier, this method is quite simple. Therefore, equipment for cold galvanizing of metal is not required. Work must be carried out in accordance with sanitary and hygienic rules.

Using this method, pipes are processed, as well as products that are in a fixed version. To do this, you need to prepare a solution and apply it to the product using a brush or roller. The only equipment used for cold galvanizing metal is a spray gun.

It helps to reach inaccessible places and paint evenly and efficiently. Among the disadvantages, many users note low reliability.

Thermal diffusion galvanizing technology

This method has been used for a long time, but it is still popular today.

https://youtube.com/watch?v=jHFJ_Nn5QPs

It was first used in England at the end of the 19th century. The invention became famous thanks to the famous scientist Sherard. However, this method was quickly forgotten, replaced by another. Its revival occurred at the end of the twentieth century.

The technology of the thermal diffusion method is that the surface of a metal product is treated with zinc in a vapor state. To do this, it must be heated to 2500ºС. The process is carried out in a closed container in the presence of a zinc-containing mixture and metal elements.

The technology for carrying out this procedure is determined not only by domestic, but also by imported regulatory documents.

Thermal diffusion galvanizing is performed when it is necessary to achieve a thickness of 20 microns. The technological process is similar to the hot galvanizing method. However, there are also differences. The prepared product is lowered into a drum oven, where processing occurs due to rotating forces. This process is completed within 3 hours of operation of this equipment. It is used to paint various small parts, such as washers and screws.

Unlike the hot method, zinc dusting occurs evenly over the entire surface.

Conclusion

This process helps protect various metal parts from corrosion, moisture, and aggressive substances. There are 4 technological types of galvanizing. Each of them has its own characteristics and is suitable for a specific type of metal.

Incompatibility of such components will lead to poor-quality painting and, as a result, to a decrease in the strength of the finished product. Galvanizing occurs in special baths or drum furnaces. However, the process can also be done at home. To do this you need to purchase consumables.

The work is carried out in a ventilated area in special protective clothing, since some components cause harm to the human body.

Source: https://FB.ru/article/242672/tsinkovanie-metalla-tehnologiya-i-metodyi

Metal galvanizing

Today, a large number of methods have been created to protect against corrosion. They are aimed at ensuring that, with the help of special solutions or substances, a thin protective film appears on the surface of metal products, which prevents oxygen and products present in an aggressive environment from reaching the metal. Galvanizing of metal surfaces is one of the most effective methods of preventing the appearance of corrosive plaque.

Metal galvanizing process

Metal galvanizing is the procedure of applying a thin layer of zinc to the surface of a metal product. This metal is excellent for creating solutions that are designed to protect against corrosion. It belongs to the category of resistant to the influence of aggressive environments. This method of protecting metal surfaces from rust gives the treated surface:

  • strength and hardness,
  •  resistance to temperature changes,
  • resistance to the influence of aggressive environments,
  • longer service life,
  • the ability not to undergo oxidation.

Metal galvanizing price

Attention: Galvanizing metal surfaces is an inexpensive procedure. The price of galvanizing metal in our country depends on its type and the amount of material being processed. The average price is from 16,000 rubles per five tons. This amount can reach 30,000 rubles.

Today galvanizing is a fairly popular procedure. Its action is based on the fact that a thin film appears on the metal surface under the influence of a zinc alloy, which completely covers the surface. It prevents the formation of corrosion on the metal, which destroys the structure of the metal and renders metal products unusable.

Due to the action of oxygen and liquid substances, a corrosive film appears on the metal surface. The metal becomes more porous and oxygen penetrates into its deeper layers, which leads to the growth of corrosion.

A coating of rust appears on the surface of the iron, which makes the metal structure more susceptible to the passage of air. The oxidation process occurs over a long period of time.

The zinc alloy film does not allow oxygen to penetrate into the deep layers of metals. Thanks to this, the process of their oxidation becomes impossible.

Metal galvanizing technology

Metal galvanizing technology involves complete coating of any types of metal products with a zinc film. This procedure requires special equipment made from materials that can withstand aggressive environments.

Galvanizing of metal surfaces is carried out in several stages:

At this stage, work with the material occurs. To do this, it is first degreased and various contaminants are removed from the surface. After this, the metal is etched using an acidic medium. The most commonly used solution is sulfuric acid. As a result, an oxide film appears on the metal. It is necessary for the best adhesion of zinc and the metal being processed. After this, all acid residues are removed and the surface is thoroughly dried.

  • Zinc alloy deposition process.

This stage involves applying a zinc film to the dried metal surface. To do this, zinc is melted in a bath at a temperature of at least 450 degrees Celsius. Only after this the metal product that needs to be processed is immersed there. The procedure lasts several minutes.

At this stage, the finished product is dried at room temperature.

As a result of the procedure, a dense film is formed on the metal surface. It makes it more durable and hard.

Galvanizing of metal products is carried out in specialized baths. They must be equipped with a device for connecting electrical current if necessary. Their volume may vary. However, any such bath can accommodate a large number of small metal products for processing.

THIS IS INTERESTING:  How to disassemble a magnet

Galvanizing baths are divided into:

  • small-sized structures,
  • medium-sized structures,
  • large-sized structures.

Types of metal galvanizing

In the modern world, galvanizing is used to treat metal surfaces. It serves primarily to protect against corrosion. Different metals require different methods of this process. This is due to the fact that not all metals are able to adhere to zinc under certain conditions.

The main methods of galvanizing metal are presented in the following ways:

This method differs from all others in that it does not require a special bath. The zinc alloy solution is applied in the same way as any paint coating.

This procedure involves lowering a metal product into a bath of zinc alloy for processing. The galvanizing process occurs under the influence of slight heating. This allows the solution to be applied to the surface more evenly.

This method is characterized by the fact that the entire procedure occurs under the influence of electric current. Metal is dropped into the electrolyte solution and an electric current is connected, supplying a small voltage.

It consists of applying a zinc alloy of any thickness to the metal surface. It is determined by the customer. Special containers are used for the procedure.

Table 1. Comparison of zinc with other metals

Metal name Brief description Metal property Application
Aluminum silver-white metal Melting point 650°C. Aluminum is resistant to atmospheric corrosion due to the formation of a dense oxide film on its surface. The most important feature of aluminum is its low density - 2.7 g/cm3 versus 7.8 g/cm3 for iron and 8.94 g/cm3 for copper. Has good thermal and electrical conductivity. Handles well under pressure. It is used in the electrical industry for the manufacture of current conductors, in the food and chemical industries. It is used as a deoxidizer in steel production, for aluminizing parts to increase their heat resistance. It is rarely used in its pure form due to its low strength - 50 MPa.
Chromium a shiny non-ferrous metal with a bluish tint, similar in specific gravity to iron. It is quite hard (one less than diamond), however, fragile. It is quite hard, but nevertheless fragile. Melting point 1910 °C. Resistant to oxidation in atmosphere and water. Nitric acid does not dissolve it. It dissolves gradually in solutions of hydrochloric and sulfuric acids, but more actively in strong hydrochloric acid. Chrome is quite strong against abrasion. In its pure form, chromium is widely used for decorative and anti-corrosion coating of other metals. In industry, chromium is widely used for the production of high-strength alloyed chromium steels.
Copper red metal, pink when broken has high ductility and corrosion resistance, high electrical and thermal conductivity (100% pure copper standard, then 65% aluminum, 17% iron), as well as resistance to atmospheric corrosion Allows its use as a roofing material for critical buildings
Titan (Te) light metal of silvery-white color. has a high melting point, low thermal conductivity and poor anti-friction properties, but is easily forged and stamped. When heated to 500 °C in air, it does not oxidize, and at higher temperatures a strong protective film forms on its surface. Therefore, titanium and its alloys are used to make the skin of supersonic aircraft, jet engine compressors, in a turbo structure - shovels and turbine disks, etc. From sheet titanium it is possible to make (using argon welding) lightweight mufflers for cars that do not rust or burn out.

Table 2. Comparison of zinc with non-ferrous metals

ConditionsMetalsBrassCopperZinc-titaniumSteel in polymers
UV resistance ***** ***** ***** ***
High temperature resistance ***** ***** **** ***
Corrosion resistance ***** ***** ***** ****
Resistance to mechanical stress **** **** **** **
Soldering ***** ***** ***
Folding **** ***** ***** ****
Weight ***** ***** ***** ***
Price **** **** ***** **
Life time **** ***** **** ***

Source: https://lkmprom.ru/clauses/tekhnologiya/tsinkovanie-metalla-tekhnologiya-i-metody/

Metal galvanizing methods

Iron and steel are the materials from which the skeleton of modern technological civilization is made. But - alas! — and the steel foundation of our civilization has its own weak spot. It is called corrosion, from which iron and steel do not have the natural protection that the oxide film provides for many non-ferrous metals - tin, zinc or aluminum.

Steel needs protection from corrosion - and the best protection for it is galvanizing. (or galvanized). Galvanized sheets will last much longer than regular steel sheets.

Why zinc?

First of all, because zinc is quite common and inexpensive, it itself is practically resistant to corrosion, melts at a not very high temperature (about 420 degrees, which is much lower than the melting point of iron), and has acceptable strength. And at the same time - what is important! - has a stationary electric potential of -0.76 V, that is, much more negative than that of iron.

Due to this property, zinc, even if the integrity of the coating is damaged and under the influence of electrolytes, will play the role of an anode in the resulting electrochemical reactions. That is, it will slowly dissolve, thereby protecting the steel base of the structure from electrochemical corrosion. In general - give us zinc coatings! Just in what ways to apply them? This is a rather interesting question, since there are several such methods - and each of them has its own pros and cons. Let's consider them

Hot galvanizing

This is, at first glance, the simplest and most reliable method of creating a zinc film on cast iron and steel products: these objects are simply immersed in molten zinc, and then taken out already coated with a layer of zinc 40 to 80 microns thick - that is, quite dense and wear-resistant.

However, not everything is so simple: in order for the zinc film to reliably “catch” on the surface of ferrous metal, this surface must be thoroughly cleaned and fluxed (that is, coated with a composition that should prevent it from oxidizing before contact with molten zinc and ensure reliable adhesion zinc film).

It should be borne in mind that molten zinc hardens quite quickly and can therefore form sagging up to 1 mm. thick, which is undesirable in cases where there is a thread on the surface of galvanized products. In addition, the technology itself imposes restrictions on the size of the products that we want to galvanize in this way - they cannot be larger than baths of molten zinc (and they cannot be very large by definition).

Cold galvanizing method

Unlike hot galvanizing, its cold version has nothing to do with the size of the parts and surfaces being galvanized, since it consists of applying electrolytic solutions of zinc in various volatile liquids to them.

Such solutions (galvanol, cynotane, cynotern, zincnol) are applied to the steel surface from a spray bottle: the solvent dries, but the zinc coating remains - and it “sits” on the steel surface very reliably, with high adhesion.

In this case, the surface to be coated does not need to be fluxed; it can simply be cleaned of rust and dirt.

The cold galvanizing method is good for its simplicity

and suitability for outdoor work. But the appearance of steel coated in this way will simply be a matte gray without a metallic sheen.

Therefore, cold galvanizing is best used as a “paintable coating”.

Galvanic galvanizing method

But the galvanic galvanizing method gives the galvanized surface an extremely attractive appearance.

It consists in the fact that current flows through a bath of electrolyte, with zinc plates serving as the anode and steel products as the cathode. Under the influence of current, zinc dissolves in the electrolyte, and its ions are deposited on the iron.

The result is a thin (from 4 to 20 microns) film that not only protects the steel from corrosion, but also gives the surface an aesthetic appearance. The surface coated with galvanic zinc can acquire (depending on its thickness) a blue-blue, light gray or matte white metallic sheen.

The main advantages of such a coating will be the uniformity of its thickness over the entire surface to be coated.

But these advantages also come with their own disadvantages: a thin and beautiful galvanic coating will not be resistant to abrasion, and an increase in its thickness will be fraught with the fact that the steel during the galvanizing process can also acquire the so-called. "hydrogen fragility". However, galvanic galvanizing. Due to its low cost, it is often used for anti-corrosion protection of various types of fasteners, metal products and decorative elements.

Thermal diffusion galvanizing

The main disadvantage of galvanic galvanizing, “hydrogen embrittlement,” is avoided by thermal diffusion galvanizing technology.

It is based on the fact that zinc, under certain conditions, can evaporate from the surface of a zinc-containing powder and penetrate into the surface layers of iron, resulting in the formation of a complex zinc-iron alloy.

Such diffusion becomes possible when

high (from 290 to 400 degrees) temperature and the presence of electrical potential, at which steel products act as an anode.

The thermal diffusion process is carried out in a rotating container at reduced pressure (0.1 atmosphere) in a reducing hydrogen atmosphere. Thermal diffusion galvanizing of each batch of fastening hardware requires from 90 to 180 minutes.

As a result, these parts will acquire a mouse-gray color - but with it, increased surface strength and excellent corrosion resistance (3-5 times better than with galvanic galvanizing and one and a half to two times better than with hot-dip galvanizing).

In this case, the uniformity of the coating will be ideal, and there is no point in talking about the adhesion of such a coating - it simply “merges” with the ferrous metal, so it is simply impossible to separate it from it. Of course, the appearance of hardware galvanized in this way does not bring much aesthetic pleasure, but bolts, nuts, springs and screws are not required to be particularly beautiful.

Thermal-diffusion galvanizing has only one drawback, but it is significant - due to the nature of the technology, it can only be used for small-sized objects.

Gas-thermal galvanizing

Recently, another option for applying zinc coating—gas-thermal—has begun to be increasingly used. In this case, zinc in the form of a thin wire or powder is fed to the nozzle of a special burner, melts in a stream of hot gas and settles in tiny drops on the surface of a steel or cast iron product.

In principle, this method could be considered a type of hot-dip galvanizing, if only the drops of molten zinc hitting the metal surface were not deformed, creating a “scaly” porous coating.

This coating requires an additional layer of paint to fill micropores in the zinc layer.

This, of course, is a drawback, but such combined coatings have excellent adhesion and are resistant to the most unfavorable operating conditions (sea water, frequent precipitation, acidic environment, etc.), where they can last up to 30 years.

Source: https://stvybor.ru/staty/212-methods-zinc-plating/

Products – Tekhmashholding – group of companies, official website

    This is not at all surprising, because the possibilities of this material are really great. This steel is perfect for making cable trays intended for laying wires and cables with voltages up to 1000 Volts, installing floors, making corrugated sheets from it, using it to create roofing, as well as in the process of creating stamped products. Galvanized cable trays not only protect electrical wires from mechanical damage, but also ensure the safety of the cable route. Trays are installed indoors, and to protect street electrical wiring they are installed outside buildings and structures.

    Characteristics of galvanized steel

    Before the metal turns into galvanized sheet, which has anti-corrosion properties, it goes through a zinc alloying process. Preference is given to this metal due to the fact that it is highly resistant to corrosion. When compared to other metals that are rust resistant, it is the cheapest. Steel receives galvanized protection after it is immersed in molten zinc, and as a result of a chemical reaction, zinc and iron molecules are bonded. The end result is galvanized steel, of which zinc is an integral part. The outer layer of this steel is zinc, followed by mixed layers, the proportion of zinc in which gradually decreases, and steel acts as the core. As a rule, this material is called galvanizing. Galvanized rolls are divided according to their purpose into several different groups: general purpose group, cold forming group, painting group and cold stamping group. Cold-formed steel, due to its drawing quality, is divided into subgroups: normal, deep and very deep drawing. Also, galvanizing thickness can be normal or reduced. Such material may or may not have crystallization patterns. The intensity of galvanizing can be determined based on the mass of zinc that was spent on processing one square meter of steel. Thus, you can understand how much zinc was spent on protecting the metal. Based on this, three classes of galvanized steel can be distinguished: • Increased class, having a mass of one square meter with a coating applied on both sides from 570 to 855 grams. The thickness of such a coating is from 40 to 60 microns. • The first class, having a mass of no more than 258, the coating on both sides reaches 570 grams, the thickness is from 18 to 40 microns. • The second class has a coating mass from 142.5 to 258 grams, its thickness is from 10-18 microns. This class of steel is used in the manufacture of galvanized cable trays (ducts). A mandatory quality of galvanized steel is cleanliness: for example, there should be no sagging or cracks on the surface of the sheet. It is acceptable to have small deposits or slight deposits on the surface; uneven crystallization of the coating and the presence of small particles are possible. When creating galvanized steel, the norm is considered to be a width from 710 to 1500 mm and a thickness from 0.5 to 3.0 mm.  

    Advantages of galvanized steel

    Metal products have many advantages over their competitors - stone and wood. A sheet of iron has almost the same lightness when compared to wood, but it is much stronger (its strength is comparable to stone, while metal is much lighter). The main disadvantage of metal is corrosion. For example, an untreated car body can last only ten years, after which it will be susceptible to corrosion and after a few years the metal will be completely rusty. There are many ways in which you can fight corrosion. One of these methods is anti-corrosion treatment with various compounds. The main disadvantage of such compositions is that if it is erased, the open area will become completely defenseless against corrosion. Nowadays, one of the most effective methods of preventing corrosion is galvanizing metal. Depending on the area of ​​application of galvanized metal, its thickness may vary: for example, the thinnest coating has a thickness of 10 microns. Steel of this thickness is used for simple working conditions. Galvanized steel with a coating of 50 microns has increased resistance to various heavy work; such a coating can completely protect the metal from hazardous chemicals and corrosion for many years.www.koks-montazh.ru

    What is galvanized steel? | ECM-Electro

    Galvanized sheet has excellent physical properties. Yekaterinburg has many offers for its sale. You can buy galvanized sheets in rolls or sheets of different sizes.

    Manufacturing

    A ferrozinc layer is applied to a metal sheet that has undergone special anti-corrosion treatment. Such sheets are called galvanized. This type of processing gives the metal the positive qualities of stainless steel; it protects the iron from exposure to aggressive environments. The ferrozinc layer gives the metal the electrochemical properties of cathodic protection. Due to the galvanic reaction of the zinc-steel layer, the first element gradually enters the oxidation process. With such a reaction, the steel itself remains undamaged. Galvanized sheets are produced using various methods. Yekaterinburg offers several types of these metal products.

    Galvanizing methods

    The galvanizing process can be carried out using various methods. Some of the most common are galvanization and hot-dip galvanizing. You can buy galvanized sheet at different prices, depending on the method of its production. During hot-dip galvanizing, the steel strip is subjected to electrochemical cleaning, drying, and then annealing. After this, the metal is passed through a bath containing molten zinc, and then it is rolled on a unit that imparts the required thickness to the zinc layer. Galvanization involves the process of electrolytic galvanizing, during which a reaction with alkaline or acidic electrolytes takes place. Galvanization obtained in this way is more ductile, but the cost of such a sheet will be slightly higher. Galvanized sheet has different categories. Yekaterinburg has many companies offering categories of sheet drawing such as:

    • G - deep;
    • VG - very deep;
    • N - normal.

    This galvanizing method is the most economical and effective. The zinc applied in this way can be located either on one side of the sheet or on both.

    Before buying a galvanized sheet, pay attention to the zinc layer; it should be uniform and continuous.

    ecm-electro.ru

    Cink Steel

    Galvanized steel today is one of the most common and best materials used for various roofing installations.

    Thus, www.metgrup.ru allows you to process the material to obtain durable characteristics.

    Reasons for choosing galvanized steel

    It should be noted that galvanized steel, first of all, is inexpensive compared to other materials. Galvanized steel is lightweight, making it easy to install and install. With its help you can create a roof with complex geometry. Galvanized steel sheets, which are used to create overhangs, valleys, gutters, pipes and cornices, have also become very popular on the market.

    And by using sheets with polymer coatings of the same color, beautiful harmony is created. The two sides of the galvanized sheet are coated with a layer of zinc, which protects the product from the influence of external factors and corrosion.

    If the steel is not galvanized, it will not be reliable and will require more frequent maintenance of the product. This is the reason that such steel is not used as a roofing material. For these purposes, exclusively hot-dip galvanized and cold-rolled steel is used. However, obtaining such steel is a continuous and very complex process. First, the steel is cleaned, then annealed, and then lowered into a special bath with zinc solution. The thickness of the zinc applied on both sides is adjustable.

    Types of galvanized steel

    Galvanized steels, according to their chemical composition, are alloyed and carbon. Alloy steel contains several elements that improve the mechanical and physical properties of steel. These elements include silicon, manganese, chromium, copper, nickel, which should be introduced in an amount of about 2.5%.

    This type of steel is divided into the following types: low-alloy, medium-alloy and high-alloy. Low alloy steel is more often used in construction. Carbon steel, in turn, is divided into high-quality structural steel, ordinary quality steel and tool steel. Ordinary quality carbon steel is an alloy of carbon and iron. Depending on the amount of harmful impurities (sulfur, phosphorus, etc.) the quality of galvanized steel is determined.

    vseojkh.ru

    What is galvanized steel sheet? — Construction and repair

    Source: https://pellete.ru/stal/chto-takoe-ocinkovannaya-stal.html

    Technology of cold galvanizing of metal, advantages, methods, compositions for galvanizing - Machine

    The longest (more than 25 years) protection of metals from corrosion is provided by coatings containing more than 95% zinc. However, traditional application methods, such as hot-dip galvanizing or galvanizing, are not always profitable, and sometimes they are completely impossible to implement.

    For hot-dip galvanizing, it is necessary to take the structures to a special workshop, where they are dipped into baths of zinc heated to 460°C. Not all structures will fit into these baths; some will have to be disassembled.

    Not every design or product can be disassembled. Some metals are capable of deforming at such high temperatures.

    Assembling and disassembling structures, as well as their transportation, entails additional costs.

    Cold galvanizing compositions do not deform metals; they can be used for structures and products of any size, and can be applied directly at the site of use, which is especially important when structures cannot be dismantled. Therefore, cold galvanizing today has also become a traditional method that allows achieving those protective characteristics in an accessible, convenient and cheap way.  

    What is cold galvanizing and how does it work?

    Before studying and choosing compositions for cold galvanizing, you need to understand how the method works and why it is so good in the fight against corrosion.

    Cold galvanizing is the application of a special composition with a high (more than 95%) zinc content to the prepared metal surface. The compositions are applied like ordinary paints, with a brush, roller, or spray gun, directly at the site where the structures are used.

    As a result, a durable coating is formed that protects not only from corrosion, but also from various negative phenomena, such as temperature changes or the ingress of chemicals.

    Despite the fact that the method is so easy to apply, it is no less effective than other, difficult to implement methods of protection.  

    Why is zinc used in formulations?

    In compositions for cold galvanizing, not just zinc is used, but its high content (more than 95%) and very high purity, without impurities (98-99%). If you apply such a composition to the surface of another metal, you will immediately provide 2 types of corrosion protection:

    1. When zinc interacts with air and water, an oxide or hydroxide is formed on its surface, which prevents the further development of the reaction and the formation of corrosion. This method prevents oxygen and moisture from penetrating deep into the iron, which is why it is called passive or barrier.  
    2. The electrochemical potential of zinc is much lower than that of iron (-760 and -440 mV). Therefore, forming a pair, iron becomes a cathode, and zinc plays the role of an anode, gives up its electrons, and is consumed itself to protect the iron. In this case, zinc compounds are formed, which “heal” coating defects, stopping the corrosion process and preventing its further occurrence. This method is called active or cathodic.   

    For some time after application (depending on operating conditions), the coating still has a porous structure that allows a minimal amount of moisture to pass through to the iron. The coating then protects the iron in an active, cathodic way.

    Subsequently, the structure of the coating becomes compacted, it ceases to allow moisture and air to pass through. Passive barrier protection comes into effect.

    However, if the integrity of the coating is damaged (defects, scratches, cracks), cathodic, active protection will come into force again.   

    How do compositions for cold galvanizing differ from conventional and zinc-containing paints?

     It's simple - conventional paints do not contain zinc, which means they do not have the protective properties that zinc provides. In addition to zinc, aluminum and tin also provide similar protective characteristics. However, their durability is slightly lower than zinc, and the price is slightly higher. Therefore, the use of zinc is optimal for use in cold galvanizing compositions.

    However, not every zinc paint or zinc-containing paint is suitable for cold galvanizing. If you see zinc in the paint, do not rush to buy it; it may not provide you with even one method of protection against corrosion.

    The composition for cold galvanizing is not paint with the addition of zinc, it is rather zinc with the addition of polymers and binders. In the composition for cold galvanizing, the zinc content must be at least 95%, and the purity of zinc should strive for 100%. In addition, zinc particles in this composition are no more than 12-15 microns, and better yet – 3-5 microns.

    If paint with zinc does not meet the above requirements, then it is not a composition for cold galvanizing and will not provide long-term (25-50 years) corrosion protection.  

    What are the advantages of cold galvanizing and are there any disadvantages?

    The cold galvanizing method has a number of undeniable advantages compared to other methods.

    Advantages:

    • There are no restrictions on the size of structures;
    • Products and structures do not need to be disassembled and transported;
    • Welding possible after coating;
    • Welds can be galvanized;
    • Quickly repair the damaged area;
    • Applicable at -10°C and +40°C;
    • We obtain an elastic coating that does not crack or deform, even when exposed to high or low temperatures;
    • High (1 point) adhesion to metal surfaces and finishing coatings;
    • Using the method on your own, without involving specialists.
    • The price is noticeably lower, and the savings are greater.

    The method also has difficulties that can hardly be called disadvantages:

    • Careful surface preparation and strict adherence to the technological process are required.
    • It is difficult to cover internal cavities and hard-to-reach areas.

    Careful surface preparation ultimately provides excellent adhesion and additional durability to the coating, so the results are worth the effort.

    Strict adherence to the technological process is required in all methods - the better the work is done, the longer and more reliable the coating will serve.

    And in order to cover internal cavities and hard-to-reach areas, cold galvanizing compounds began to be produced in the form of sprays, and they also used special attachments for spray guns.

    Due to its compatibility with welding, the mobility of the technical process and the possibility of applying it to a structure of any size, cold galvanizing is used to protect bridges and bridge structures, various reservoirs, port and hydraulic structures, power line supports, road fences, lighting poles, cellular masts, protection of railway trains, pipelines, equipment of industrial enterprises and building metal structures, not to mention fences, gates, roofing and smaller metal products.   

    The application process is very simple!

    The technological process of cold galvanizing is quite simple and has only 6 points. Usually they cope with it on their own, that is, without the involvement of specialists.

    1. Surface preparation – removal of old coatings, cleaning, degreasing. For better adhesion, it is important to roughen it (sandblasting or metal brushes).
    2. To prepare the composition, mix with a drill with an attachment or mixer until smooth.
    3. Application of the material - by brush, roller, spray gun or dipping.
    4. Applying the required number of layers. Layer drying from 10 to 40 minutes.
    5. Quality control of the coating - it should not have through pores, bubbles or visible damage.
    6. Final curing before commissioning.

    You can learn about the process of surface preparation and application in detail in the article Cold galvanizing with your own hands.  

    Once the corrosion protection industry began to appreciate the benefits of cold galvanizing, many different types, grades and formulations appeared on the market. We will tell you about the most popular and proven options.

    Compound for cold galvanizing or zinc-containing paint. Contains 96% pure zinc, guarantees a reliable anti-corrosion coating for a period of 10 to 50 years, depending on the number of layers and operating conditions.

    It is highly economical to use - only 220-300 grams of composition are used per 1 m2 with a layer thickness of 40 microns. Sold at a low price - from 300 rubles per kg.

    Dries quickly (20 minutes) and combines well with 99% of paint finishes.

    Dries quickly (30 minutes), forms a coating resistant to prolonged contact with alcohols, salts, sea and fresh water. Allows you to weld structures after coating without destroying it.  

    Sold at a price of 270 rubles per kg. Excellent for protecting cold water pipes.

    Composition for cold galvanizing with a protective effect. Allows application without preliminary cleaning of the surface (we still recommend doing this for greater durability of the coating) and at temperatures from -30 +80°C. The finished Zinkor-Barrier coating will withstand temperatures from -60 to +150°C.

    Withstands constant exposure to aggressive environments, fresh and sea water, salts, alkalis and weak acids. Contains 96% zinc.

    Dries from 10 to 50 minutes, compatible with most paintwork materials, excellent for use in the oil and gas complex. Costs from 400 rubles per kg.

    Zinc spray or Zinkor spray is a complete composition for cold galvanizing in an aerosol can. Contains 96% zinc, protects metals that are constantly in water, soil and air from corrosion.

    Works great not only as a stand-alone coating, but also as a primer in combination with various decorative paints and varnishes. You can use zinc welding spray.  

    Has tread protection. Convenient to use in hard-to-reach places or for repairing small areas of coating. Price – from 400 rubles per 520 ml can.

    Anti-corrosion zinc-rich composition. Contains 85% zinc, but has increased resistance to dirt, water, oil products, and aggressive atmospheres.

    • It is actively used to protect hydraulic structures, bridges, load-bearing building structures, and oil storage tanks.
    • Has excellent adhesion to metal surfaces (1 point) and to finishing coatings.
    • Sold at a price of 360 rubles per kg.  

    Often used for corrosion protection of water supply systems or petroleum storage tanks. Works as an independent coating or as a primer, in combination with various enamels. Sold at a price of 295 rubles per kg.

    Composition for cold galvanizing with increased resistance. Can be applied in frosts down to -30°C; after complete drying, it can withstand both low (-60°C) and high (+160°C) temperatures.

    Excellent compatibility with almost all paintwork materials. Easily copes with constant heating, contact with fresh, sea and even hot water. It is used to protect water pipelines, including hot water supply, petroleum product storage tanks, transport, building structures, hydraulic structures and in other areas. Costs from 330 rubles per kg.

    A well-known composition that has gained fame around the world. It is actively used in industry, transport, at nuclear power plants and hydroelectric power stations, it is used to protect bridges and roads, it is indispensable in oil refining and forging, during construction, as well as at urban infrastructure facilities. Sold from 690 rubles per kg.

    How to choose the composition you need?

    Before you buy a composition for cold galvanizing, you need to understand what your requirements it must meet. You need to study its composition and find out what the manufacturers guarantee if you apply this coating.

    The color of the compositions for cold galvanizing is practically the same - gray, matte. The consumption of the composition is also approximately the same for everyone - about 300 g per 1 m2.

    What you should pay attention to:

    • Zinc concentration - must be at least 88-94% zinc, otherwise it is not a composition for cold galvanizing, but simply zinc-containing paint, which will not give the desired effect.
    • The service life of the coating without renewal should be 25-50 years.
    • Shelf life and shelf life of the composition - if you are not going to use it on the same day, then this is a very important parameter for you.
    • The drying time of the layer and commissioning will tell you how quickly you can use the structure after applying the coating.
    • Surface preparation and application conditions may require conditions that you may find difficult to achieve.
    • Price - sometimes it is inflated simply because of imported production or brand recognition. You can always choose less expensive, domestic analogues with the same characteristics.​

    Look for all compounds for cold galvanizing in the metal protection catalogue.  

    Do you need advice and help in choosing the right composition?

    Source: https://regionvtormet.ru/okrashivanie/tehnologiya-holodnogo-tsinkovaniya-metalla-preimushhestva-metody-sostavy-dlya-otsinkovki.html

Did you like the article? Share with friends:
Metals and their processing
-- Sideb lion (lipk) -->
How to coat metal against corrosion

Close
For any suggestions regarding the site: [email protected]
Для любых предложений по сайту: [email protected]