Products – Tekhmashholding – group of companies, official website
- We have been providing galvanizing services for more than 4 years, the essence of which is the electrochemical deposition of zinc on the surface of a metal in a solution of zinc-containing electrolyte.
- Galvanic coating complies with GOST 9.301-86
- Zinc coating thickness from 6 to 20 microns
- Appearance: depending on the finishing treatment, the coating has a silver-gray or greenish-yellow color, is smooth, and has a decorative appearance.
- The price of galvanizing metal is negotiable, depending on the thickness of the coating and the volume of the order.
- high technology
- relatively low cost
- obtaining a sufficiently high level of product protection
- uniform coating application without streaks and drops on parts of any complexity
- obtaining smooth and beautiful protective coatings without additional processing
- for highly loaded springs
- for parts operating at temperatures above 250°C
- for parts operating in fresh hot water at temperatures above 60°C
- in some other cases related to the specific operating conditions of the products
- The color of the zinc coating with colorless chromating is silver-gray or silver-gray with a bluish tint. Slight rainbow shades are allowed.
- Iridescent chromate coating color: greenish-yellow with iridescent tints
- Allowable dimensions: 1000 x 500 x 500 mm
- Minimum lot size: 1 piece
- 24/7 production
- Standard order production time is 48 hours
- Implemented international QMS ISO 9001 at the enterprise
- Transportation of products, if necessary, is carried out by our transport
- Cleaning the product from dirt, rust, varnish and other coatings. Processing in alkaline solution.
- Electrolytic degreasing.
- Etching in a solution of hydrochloric acid for final purification, as well as activation of the metal for the main procedure.
- Immersion of parts in an electrolyte bath, as well as pure zinc elements placed in mesh sections. Electric current is applied to two metals. Zinc ions settle on the surface of the part.
- Clarification in nitric acid with removal of the oxide film.
- Phosphating to form a phosphate film, which enhances the protective properties of zinc.
- Passivation in a solution of chromic acid or its salts. Enhances the shine of the coating.
- effective protection from environmental conditions (moderate);
- the coating can be applied to objects of complex shape;
- smooth coating without smudges or drops;
- aesthetic appearance and shine, no need for additional processing;
- low costs for the coating process.
- low level of adhesion to different types of metals—this weakens the anti-corrosion effect over time;
- the metal may become brittle, which is dangerous if the product is used in structures;
- The coating is not resistant in aggressive environments and is intended for use in moderate environments.
- Galvanic galvanizing method
- Metal coating
- Galvanic bath
- high level of productivity. In a short time, a large number of metal products are coated with a solution of zinc alloy and electrolyte.
- Accuracy of the procedure. After processing metal products in this way, a uniform coating is formed that covers the entire product. There are practically no smudges or chips.
- Improving the external qualities of individual metal objects. This method is excellent not only for protecting against corrosion, but also for giving products made from different metals an aesthetic appearance. The surface is covered with a thin layer of silver-colored film. The product becomes shiny.
- An electric current is supplied to the two metals that are in the galvanic treatment bath. For this purpose, special electrodes are used.
- A metal such as zinc can be used in any form. It is placed in special mesh-type containers.
- During the electrolysis process, charged zinc particles disintegrate into ions and settle on the surface being treated. In this case, the coating layer is quite small.
- Under the influence of electric current, zinc anode particles are split.
- To process metals in industrial conditions using this method, three types of solution are used: acid, alkaline, cyanide. Their choice depends on what metal is being processed with a zinc alloy.
- small-sized bath. It is designed for processing small metal products.
- Medium sized bath. It can easily fit one metal object, which consists of metal parts. There is no need to disconnect them to fully process the product.
- Large bathtub. It is used for processing large objects with zinc alloy. It even accommodates short length pipes.
- hot;
- cold;
- electrochemical, or galvanic;
- gas-thermal;
- thermal diffusion.
- conditions for using the part;
- thickness of the protective layer;
- durability;
- special protection requirements.
- complex and energy-intensive equipment;
- high temperatures;
- extremely harmful production waste;
- the size of the processed products is limited by the dimensions of the zinc bath.
- mechanical cleaning;
- degreasing;
- etching in an acidic environment;
- washing and flux treatment;
- drying.
- low environmental hazard;
- low porosity;
- high mechanical and anti-corrosion resistance (several times higher than with the galvanic method);
- there is no need for waste disposal.
- the coating turns out dull, gray and does not decorate the product;
- low productivity;
- harmful working conditions.
- Battery 6-12 V, 2-6 A (any car or motorcycle). Instead of a battery, you can use a charger of sufficient power.
- Bath made of non-conductive material (plexiglass, textolite, etc.)
- Suspension system: conductive rods and hooks.
- Switching devices and wires.
- Ammeter and rheostat.
- Electrolyte - any zinc-containing salt. You can take a car electrolyte and dissolve zinc powder in it.
- Zinc plates.
- current strength;
- electrolyte temperature;
- electrolyte density
- production of power transmission line supports;
- any metal structures and structures;
- production of equipment used in places of high humidity;
- equipment and structures for oil production and refining;
- production of road barriers and wheel guards ;
- automotive industry and agriculture.
- manufacturability and simplicity of the process, the coating is created quickly;
- no expensive equipment for galvanizing ;
- the process is faster than other options.
- When cold galvanizing, a mixture of zinc is applied to the top of the product.
- Apply this mixture with a roller or brush; if complex products are being coated, then use a spray gun.
- Up to 93% of zinc is formed on the surface.
- installed pipes;
- power line parts;
- some parts of railway tracks;
- elements that are in assembled condition and cannot be dismantled for galvanizing.
- low resistance to impacts, chips and scratches;
- sensitivity to organic solvents.
- First, the surface is cleaned of dirt, dust and degreased.
- Then etching occurs with acid solutions.
- The structure is washed and fluxed.
- The metal is dried.
- After the first 4 stages of metal preparation, zinc is prepared.
- The metal structure is placed in a large tank filled with molten metal.
- During the process, a thin iron-zinc layer is formed on the steel, creating reliable protection against rust.
- After removal from the bath, the product is dried using a special apparatus.
- accuracy and ability to adjust layer thickness;
- smoothness of the coating;
- protective layer up to 30 microns;
- perfect uniformity;
- impressive decorative properties.
- Metal plates are exposed to current in a special electrolyte solution.
- After some time, due to the action of electrodes with different charges, metal products begin to dissolve, and zinc rushes to their surface, creating a uniform layer.
- metal coating with zinc occurs by applying a dry mixture;
- then the mixture is transferred to an airtight container and heated to 2600 degrees;
- zinc gas obtained at this temperature penetrates the metal molecules;
- the method is used to create a layer of protection with a thickness of 15 microns and higher.
- adjustment of layer thickness in a wide range;
- no need to dispose of generated waste;
- absence of pores on the finished coating;
- environmental safety;
- strength and protection are 5 times higher than those of the galvanic method.
- Aluminum . Used for the production of current conductors, as well as in the food and chemical industries. Additionally, it is used as a deoxidizing agent in the manufacture of steel for heat-resistant structures.
- Chrome . Used for decoration and beauty, as well as for corrosion protection in the manufacture of high-strength alloy steels, for example, in the production of hairpins.
- Copper . A beautiful, high-strength metal that is used primarily for roofing elements.
- Titan . Light metal is widely used in aircraft construction, in the manufacture of jet engines, and turbines. Sometimes used to make car mufflers.
- excellent corrosion resistance in fresh or sea water, as well as in polluted atmospheres;
- shiny decorative coating.
- fasteners;
- tools;
- brackets;
- supports and suspensions;
- external parts of cars;
- equipment;
- cold rolled steel.
- mechanical cleaning;
- steel pickling;
- washing in water;
- degreasing from oil and grease stains;
- washing;
- galvanic galvanizing of steel;
- washing and drying.
- slightly acidic and sour. Standard mixtures based on sulfates, chlorides or their components;
- ammonia are neutral and alkaline mixtures obtained by dissolving zinc oxide in a mixture of ammonium sulfate;
- cyanide and zincate. Alkaline mixtures that use sodium cyanide and zincate dissolved in sodium hydroxide.
- Cold galvanizing. The coating process is carried out as a result of electrochemical reactions, adhesion is ensured by molecular attraction. To protect against corrosion, surfaces are coated with special paints with a high percentage of highly dispersed zinc. The simplest and most accessible method is widely used in the manufacture of consumer goods and metal structures of prefabricated buildings.
- Hot galvanizing. In terms of frequency of use, it ranks second among all methods, and in terms of quality of coverage it occupies a leading position. Disadvantages - large energy losses, harmful effects on the environment. The prepared parts are immersed in special baths with molten zinc, after exposure they are removed and left in a suspended state to remove excess and cool.
- Galvanic galvanizing. Technical parameters meet the requirements of GOST301-86, coating thickness up to 30 microns. During the process, zinc moves from the anode to the surface of the product; to impart the desired properties to the coating, electrolytes of different chemical compositions are used. The disadvantage of the method is the difficulty of cleaning technological compositions.
- Gas thermal galvanizing. One of the complex methods, zinc is melted in a heated gas stream and directed to the surface of the workpiece. Used for processing industrial elements with large linear dimensions. Precipitates are porous; to increase protection against corrosion processes, an additional coating of a layer of zinc is required.
- Thermal diffusion galvanizing. One of the types of hot-dip galvanizing. The coating occurs due to the penetration of zinc atoms into the steel, forming a complex structure of an iron-zinc alloy. Advantages: parts are processed in confined spaces, which minimizes the harmful impact on the environment, the coating is smooth without micropores, the thickness of the zinc coating varies widely.
- Sulfate electrolytes. The main component is zinc sulfate, the optimal concentration is at least 200 mg/l. For continuously moving galvanized parts, the concentration can increase to 700 mg/l. Sulfate solutions are easy to use, non-toxic, and have a high current efficiency. Due to these indicators, galvanizing in sulfate electrolytes has become widespread during the processing of parts of simple design. To stabilize acidity, special additives are added to the composition.
- Chloride electrolytes for galvanic galvanizing. Despite their high current conductivity, they are used much less frequently. The reason is that it is technologically difficult to obtain chemically pure zinc chloride, and other brands of salt contain a large number of unacceptable impurities.
- Boron fluoride electrolytes for galvanizing. The main component is lead borofluoride; sodium salts are added to increase electrical conductivity; the surface structure is improved by adding PVA composition. The current output is greatly influenced by the operating mode of the equipment. Application of zinc coating should be carried out at a temperature of +20°C. The mass of zinc depends on the deposition time and the concentration of the solution.
- Ammonium chloride electrolytes. Due to high cathodic polarization and electrical conductivity, optimal dissipation power is achieved. Galvanizing is smooth and shiny, coatings are uniform on complex profiles. The equipment does not require additional mechanisms for mixing the solution; buffer additives are used to stabilize acidity levels. To obtain shine during galvanic galvanizing, shine formers are used. Chlorammonium-urotropic electrolytes are widely used in industry; ammonium acetate is added to depassivate the anodes.
- Amino complex electrolytes for galvanic galvanizing. Obtained by adding various organic compounds to chlorammonium, they have a high polarization of zinc. The precipitates are fine-crystalline and, when special additional components are used, shiny. Equipment for performing the work is ordinary,
- Pyrophosphate electrolytes for galvanic galvanizing. Plastic containers are used to equip production lines; parts are prepared in separate baths. As a result of the chemical interaction of the initial components, a precipitate of zinc pyrophosphate precipitates, which subsequently dissolves to form zinc complex compounds.
- Initially, the part is degreased and washed.
- Then etching occurs in a solution of hydrochloric acid to remove contaminants, rust, salts and scale.
- The structures to be galvanized and the zinc plates are immersed in an electrolyte bath. The plates and structures are connected to a direct current source.
During electrolysis, the zinc anode dissolves and settles on the surface of the steel product.
- Then comes washing and clarification in nitric acid to remove oxide films, and additional washing.
- Passivation with application of an additional protective layer.
- Washing and drying galvanized products.
- Control of product appearance.
Advantages of the galvanic method of galvanizing metal:
Scope of application of electroplating
Currently, galvanic metal processing is widespread and is used in all areas of industry to protect various metal products and parts, such as bolts, nuts, washers, fasteners and structural elements, from corrosion. Parts made of steel of various grades with tensile strength up to 1500 N/mm² can be galvanized.
Electrolytic galvanizing is not recommended for use in the following cases:
Appearance of finished products
With the galvanic galvanizing method, the coatings are of precise size, uniform, shiny, and have a decorative appearance. The final products can have two coating color options:
Zinc coating thickness
Galvanic galvanizing is the most rational and economical method of metal coating, allowing the thickness of the deposited zinc layer to be adjusted over a wide range. The thickness is adjusted depending on the purpose, conditions and service life in accordance with GOST 9.303-84 and varies widely - from 3 to 40 microns. For example, for light operating conditions the coating thickness is 6-9 microns, for medium and hard conditions - 15-21 microns, for particularly harsh conditions - 24-40 microns.
Corrosion resistance
Application of zinc galvanic coating using colorless and iridescent chromating provides products with protection from various types of corrosion and mechanical stress.
Corrosion resistance is characterized by the time before the appearance of corrosion products when tested in a neutral salt spray chamber. The duration of testing in the chamber is determined depending on the thickness of the coating and the type of additional processing.
Our company regularly tests the coating in a neutral salt fog chamber, both independently to certify the quality of the applied coating, and at the request of Customers.
Norms and Standards for Galvanic Zinc Coating
General requirements for zinc coatings are set out in GOST R 9.301-86. Methods for monitoring zinc coatings are presented in GOST 9.308-85.
Coating method
We carry out galvanizing of metal parts, both in drums and on a hanging line. The suspension line is used for galvanizing mainly metal structures, machine parts, instruments, fasteners, furniture fittings, fittings, etc.
Parameters of products for processing on the hanging line:
Galvanizing in drums is ideal for coating small parts: hardware (bolts, nuts, studs, etc.), metal fittings, etc. Described in more detail in our article.
Advantages of ordering galvanizing services from us:
galvanika63.ru
Galvanic galvanizing of metal: technology, equipment
Business May 15, 2016
Galvanic galvanizing is an effective and inexpensive, and therefore a common way to protect ferrous metals from corrosion. Most often it is used in the production of hardware and fasteners, as well as steel mesh.
Methods of applying zinc coating
Anti-corrosion galvanizing is performed in various ways, and the service life of the coating depends on the thickness of the protective layer.
The method of applying the coating depends on its required properties, the size of the product, and the conditions of its further operation.
The simplest and most technologically advanced, but insufficiently providing resistance to mechanical impacts of the protective layer, is cold galvanizing using primers that contain large quantities of highly dispersed zinc powder.
In terms of the volume of galvanizing production, hot galvanizing ranks second. The coating obtained in this way is high-quality and durable, but environmentally unsafe, since molten zinc is used, and maintaining its temperature slightly less than 500 ° C requires a large amount of electricity and chemical surface preparation methods.
Very similar to hot-dip galvanizing, a more technologically advanced, but less productive method of thermal diffusion application of a protective layer. It is used when high demands are placed on the thickness and appearance of the coating.
Another galvanizing method is thermal gas spraying, which is used to protect large-sized products and structures that simply cannot be placed in a bath.
Galvanic galvanizing does not have many of the disadvantages of other coating methods and has its positive aspects.
Advantages of galvanic galvanizing
The method of applying zinc coating by electrolysis is the most common.
The main advantage for which galvanic galvanizing of metal is used is the high degree of protection of the material surface from corrosion. A thin layer of zinc increases the service life of products several times, and therefore reduces the cost of their maintenance and replacement.
The coating is smooth, without streaks or drops, and both the shape and size of the product are preserved. It can be applied to objects of any shape, even the most complex.
Smooth and shiny decorative coatings do not require additional processing in most cases.
In addition, the process of applying zinc coating itself requires low costs, and galvanic units have high productivity.
Source: https://pellete.ru/cink/galvanicheskaya-ocinkovka.html
Galvanizing to protect metal
Applying a layer of zinc extends the service life of the product
Galvanic galvanizing is a method of applying a protective layer of zinc to a product using an electrolyte solution. This creates a uniform and smooth coating with a thickness of 9-15 microns on its surface.
It does not allow various substances to penetrate the structure of the metal and change its properties, so the surface becomes more resistant to environmental conditions. How the zinc galvanization process is carried out correctly is regulated by GOST 9.301-86.
Using an electrolyte solution, metal products of various shapes and sizes are coated, however, only on the outside. These are the features of the technology: inside, if there are no through holes, zinc does not lie down due to the lack of electrical conductivity.
For galvanizing small elements with threads, a rotating drum is used, and for larger ones, a hanging method is used (fixed on a wire and immersed in a solution). The corrosion protection provided by the procedure extends the life of parts and, accordingly, reduces maintenance or replacement costs.
In addition, galvanic galvanizing performs a decorative function: after galvanizing, the products undergo passivation, during which the products are given the desired color.
The method is mainly used for steel and cast iron products to provide corrosion protection and an aesthetic appearance. Most often these are various types of fasteners and tools, brackets and supports, sheet metal, external parts of machines and equipment.
Main stages of the process
Galvanic lines at enterprises necessarily include technological baths where the zinc coating is created. The process depends on what metal needs to be galvanized; simple acidic or complex electrolytes are used (both groups have several varieties).
The line also includes devices for transporting products and for treating wastewater. Here are the main stages that the part goes through, and each of them is followed by washing:
This is followed by drying of the finished galvanized product and quality control.
Advantages of the galvanization method
Main disadvantages:
Source: https://metalloprokat-staleron.ru/stati/galvanicheskoe-cinkovanie-dlya-zashhity-metalla/
Galvanic galvanizing
In the modern world, a large number of methods are used to protect metal surfaces from the formation of a layer of corrosion, which leads to the fact that the metal coating begins to become more brittle and collapses. Today, for effective protection against corrosion, the galvanic method of treating metals with zinc is used.
Galvanic galvanizing of metal
Galvanic galvanizing is the process of applying zinc to the surface of a metal in an electrolyte solution. This method is one of the most effective for combating the appearance of corrosion on metal products.
The zinc alloy covers the metal with a thin film that has excellent protective properties. It makes it possible, after processing, to use metals in an aggressive environment. It prevents various substances from penetrating the metal structure to change its properties.
As a result of the use of zinc and electrolyte, metals become more durable and resistant to environmental conditions.
Zinc is a suitable metal for processing other types of metal materials. After the galvanic galvanizing procedure, a layer of film appears on the surface of the treated metal, which gives it a silvery tint with a bluish tint. Thanks to this, a product made from such material acquires a more aesthetic appearance.
Galvanic galvanizing of metal has advantages and disadvantages.
The advantages of this procedure include:
The main disadvantage of this procedure is the low level of adhesion to different types of metals. As a result, the protective effect against corrosion does not last long. In addition, as a result of anodizing, the metal may become brittle, which leads to structural failure.
Today, galvanizing is used to coat individual components with a zinc alloy to protect them from corrosion and to provide an aesthetically pleasing appearance. Nails, hardware and fastening tools are processed using this method.
Table 1. Galvanic compatibility of metals
MetalSteelAluminumDuraluminCopperBrassBronzeChromeNickelZincTinSolder PIC| Steel | + | + | + | — | — | — | + | + | + | + | + |
| Aluminum | + | + | + | — | — | — | + | — | + | P | P |
| Duralumin | + | + | + | — | — | — | + | — | + | P | P |
| Copper | — | — | — | + | + | + | + | + | — | P | P |
| Brass | — | — | — | + | + | + | + | + | — | P | P |
| Bronze | — | — | — | + | + | + | + | + | — | P | P |
| Chromium | + | + | + | + | + | + | + | + | + | P | P |
| Nickel | + | — | — | + | + | + | + | + | + | P | P |
| Zinc | + | + | + | — | — | — | + | + | + | + | + |
| Tin | + | P | P | P | P | P | P | P | + | + | + |
| Solder PIC | + | P | P | P | P | P | P | P | + | + | + |
Galvanic coating of metal
Galvanizing technology is an electrolytic chemical process, which consists of the following:
Attention: Galvanic processing of metals with zinc is best carried out in a weak acidic environment. Thanks to this, it is possible to obtain a denser coating and an even protective layer.
Galvanic galvanizing bath
In the modern world, specialized equipment is required for galvanic processing of metals in a zinc alloy solution. Manufacturing plants use production lines that consist of elements that allow galvanic processing of metal products on an industrial scale.
Equipment for galvanic galvanizing is represented by specialized baths. They are made from materials that are not destroyed under the influence of an aggressive environment.
Galvanic galvanizing baths can be of several types:
The main disadvantage of electroplating equipment is that it is not suitable for processing non-standard products.
Also included with the equipment for carrying out this process of processing metal products is a device for supplying electric current. Without it, the deposition of zinc particles on the surface of metals is almost impossible. It must have electrodes for connection to metal and zinc alloy.
Galvanizing line
. Electroplating of metals.
Source: http://lkmprom.ru/clauses/tekhnologiya/galvanicheskoe-tsinkovanie-metallov-osobennosti-ts/
Metal galvanizing
Steel products are used in all areas of human life. Durable and reliable, they bring benefit and convenience for a long time. But steel products have a dangerous enemy - rust, which can render them unusable. There are many ways to protect against it. One of the popular ones is galvanizing the metal.
Metal galvanizing
Features of the galvanizing procedure and the main methods of metal protection
Metal corrosion, or the process of its oxidation, is especially intensified in conditions of high humidity. To prevent corrosion of metal products, protective coatings are applied to them. Galvanizing of metal is considered one of the most reliable, since zinc takes on the effects of aggressive environments. Galvanizing provides not only barrier, but also electrochemical protection of the metal. During the reaction, an oxide layer appears on the surface of the part, which provides additional protection.
After mechanical destruction of the coating, the effect of the protective layer ceases. There are various types of metal galvanizing, many of them require complex and expensive equipment, but some can also be used at home.
Galvanized pipes
Galvanizing technology was first mastered in France in the 18th century and further developed in England. Domestic scientists Jacobi and Mendeleev made a great contribution to improving the process. Today, galvanizing metal is one of the most affordable ways to protect against corrosion.
Galvanizing methods
Metalworking specialists distinguish the following methods for applying zinc coatings to metals:
The application method is selected based on the following criteria:
The thickness of the layer is determined by the time the part is in the working environment and the temperature in the working area. When designing a technological process, it should be borne in mind that mechanical processing after coating the part with zinc will destroy the protective layer.
Hot galvanizing
This method is distinguished by the high quality of the resulting metal coating. However, its distribution is limited by the following disadvantages:
First, a block of preparatory operations is performed:
Hot galvanizing
Only after this does the actual galvanizing begin. The prepared parts are lowered into a bath of molten zinc. A thin layer consisting of Fe and Zn compounds appears on their surface. Next, the parts are taken out of the bath and blown with air under high pressure. This allows you to remove excess zinc and at the same time dries the part.
Due to the complexity of the process and harmful working conditions, it is not used at home.
Cold galvanizing
This method is technologically much simpler. It can be reproduced at home. A layer of zinc-containing substance is applied to the workpiece using a brush or roller. To protect workpieces of particularly complex shapes and topography, spray guns are used. Compositions for cold galvanizing of metal are polymer solutions based on fine-grained zinc powder. The most commonly used is zinconol, which creates a corrosion-protecting layer on the surface with a 90% Zn content.
Cold galvanizing is also used in industry to protect already assembled parts and structures - for example, power line supports.
Cold galvanizing
The method is also used to restore partially damaged anti-corrosion coatings, for example, as a result of wear or repair work.
The disadvantage of this method of coating metal with zinc is the low mechanical strength of the coating.
Galvanic method
The electrochemical method allows you to obtain a durable and smooth layer. During the process, you can control the thickness of the applied metal layer. The quality very much depends on the degree of degreasing of the workpiece.
Galvanization of parts occurs as follows. Protected workpieces and zinc plates - donors are lowered into a bath of electrolyte, and voltage is applied to them. The current flowing in the resulting circuit, using the phenomenon of electrochemical metal transfer, pulls zinc atoms from the plates and deposits them on the workpieces.
Galvanic galvanizing
The disadvantages of the method are the high cost, which consists of the cost of plates, electrolyte and electricity. In addition, you will have to incur high costs for decontamination of the spent electrolyte.
Thermal diffusion galvanizing
The technology was developed in the early 19th century, but only recently gained widespread popularity. The workpieces to be protected are placed in a sealed container, into which dry powder containing zinc is added. Next, the container is heated to high temperatures (400-900 °C). The zinc evaporates and its vapors are deposited on the surface of the product. Preparation of workpieces is carried out in the same way as in the case of hot-dip galvanizing.
The advantages of this method are as follows:
Thermal diffusion galvanizing
The disadvantages include:
The uniformity of the thickness of the zinc coating layer also leaves much to be desired.
Gas thermal spraying of zinc
The method is used for processing large-sized products, steel sheets, etc. Zinc is transferred to the prepared surface of the workpiece by a jet of burning gas. A zinc wire is placed in the flame of a gas burner, it melts and droplets of metal fall on the workpiece, forming a scale-like layer on it.
Gas thermal galvanizing
The method is used in combination with the application of anti-corrosion paints and varnishes and is very effective for protecting the hulls of sea vessels and coastal structures.
How to perform the procedure at home
Galvanizing at home is most often carried out using the galvanic or cold method. First of all, you need to degrease the workpieces, pickle them with an acid solution and rinse thoroughly with water.
A galvanizing installation will require the following materials and equipment:
The rods are placed across the bathtub, the plate parts are suspended from them, after which the wires from the battery are connected through an ammeter and a rheostat. When carrying out galvanizing with your own hands, keep in mind that the thickness of the layer is determined by such parameters as:
Affects the thickness and total surface area of the workpiece.
Source: https://stankiexpert.ru/spravochnik/materialovedenie/cinkovanie-metalla.html
Galvanizing
To place an application, contact us by phone: (383) 284 44 40 . The application can be sent to [email protected] , or fill out the form to calculate the cost of the product.
galvanizing procedure is required in the manufacture of most fasteners, and is also necessary for many types of building metal structures. At Nedvals you can order galvanizing of elements in the manufacture of certain parts. Our arsenal includes more than 5000 sq. m of production premises, as well as modern tools for applying zinc coating using all existing methods.
To find out the details and place your first order, call (383) 284 44 40. An expert will help you decide on the coating application method and tell you which product is best to order for certain purposes.
Galvanizing: Why is a thin layer of metal applied to steel?
Steel is a strong, reliable and durable material. However, it is susceptible to corrosion even after short-term exposure to a humid environment. Therefore, the use of steel structures in fresh air or sea water becomes impossible.
This would be the case if the galvanizing . This process ensures that the zinc molecules firmly adhere to the steel, creating impeccable rust protection. By forming a galvanic couple, zinc is almost impossible to remove mechanically from the surface of the steel.
Fact! The period of decomposition of zinc coating is measured in decades, reaching 50-70 years of operation in constant conditions of an aggressive environment.
Even after the zinc has degraded in certain areas, the process continues to form zinc hydroxide, which extends the life of the product and the coating as a whole. Additionally, galvanizing creates electrochemical protection of the metal.
Galvanizing: areas of application
There are many application methods for galvanizing For example, when making hammer rivets, one method is used, but for coating threaded rods, a completely different one is used. Galvanization is used in such areas as:
Galvanizing is used in almost all known branches of light and heavy industry. And this is explained by such main characteristics of zinc as resistance to environmental influences, safety and environmental friendliness, as well as the low cost of galvanizing.
In modern industry there are few methods for protecting metal from corrosion that can compete in price and quality with galvanizing . After all, structures with such a coating can be used for many years in sea water, in soil and in some acidic environments. But when using galvanized structures in acids and alkalis, it is important to remember that its service life is significantly reduced.
Methods for galvanizing steel structures
Nedwal's company uses all existing techniques for galvanizing metal structures , focusing on the tasks and needs of the customer. Cold and galvanic galvanizing methods are the most popular methods of applying metal to steel and other products. However, there is another method - hot galvanizing, which is also in high demand in Novosibirsk .
Cold galvanizing method
Cold galvanizing is perhaps the most popular method of protecting metal from corrosion. And this is due to the following reasons:
The essence of this method is extremely simple:
In some situations, cold galvanizing in Novosibirsk becomes the only possible method of processing products.
Cold galvanizing: when there are no alternatives
Such products include:
Cold galvanizing mixtures are also used during the restoration of metal structures. For example, when restoring a car body.
Fact! Cold galvanizing does not require compliance with such requirements as temperature conditions.
Despite the simplicity of the technology, the final coating is strong, reliable, elastic and incredibly resistant to both mechanical damage and thermal expansion.
But we must not forget about the existing disadvantages of cold galvanizing :
It is these disadvantages that make cold galvanization unprofitable or unavailable in some areas.
Hot-dip galvanizing: features, pros and cons
The next widespread method of galvanizing metal structures is hot-dip galvanizing, which is also in great demand in Novosibirsk. It takes a well-deserved 2nd place in demand among Nedvals customers .
When considering the hot galvanizing method, it is important to learn about its possible negative properties, the main one of which is environmental unsafety. Hot -dip galvanizing uses toxic chemicals to treat the surface of the structure. Molten zinc is then applied to it.
Galvanizing stages
The galvanizing procedure begins with preparing the surface for the application of zinc:
to perform hot-dip galvanizing in Novosibirsk if the dimensions of the product are too large, for example, power line supports. In this case, the choice is made in favor of cold galvanizing. An important feature of the hot procedure is that it cannot be performed at home due to the need for complex equipment and the danger of the process.
Galvanic galvanizing: advantages and applications
During galvanic galvanizing of metal, metal structures are treated electrochemically. The advantages of this method are the following:
The metal structure on which zinc is applied adheres to the coating so powerfully that even the molecules bond with each other, making it the strongest of all existing ones. If the metal processing method before applying zinc is violated, the galvanic method completely loses its advantages .
This is why it is so important to trust metal galvanizing in Novosibirsk to industry experts. By contacting Nedvals, the customer receives a guarantee of strict adherence to the technology.
Galvanizing technique
When galvanizing, the following technology is followed:
Among the disadvantages of galvanic galvanizing, the most acute is its high cost. Also, after galvanization, a lot of hazardous waste is generated that requires specific disposal and purification before being discharged into the sewer.
Thermal diffusion method
In addition to galvanic, cold and hot galvanizing in Novosibirsk, the thermal diffusion method, or TDC, deserves attention. It is also called sheradization. Here are its features:
The structure is prepared as in the hot galvanizing . But it has significant differences from all other galvanizing methods and specific advantages:
But it is impossible to imagine such galvanizing without disadvantages, which include: an unsightly dirty gray color, low productivity, harm to human health, and non-uniformity in thickness.
Whatever method the customer likes, it is important to choose the galvanizing method based on the assigned tasks and operating conditions of the metal structure. In any case, at the Nedvals company galvanizing is carried out by experts who guarantee the creation of a reliable coating without defects.
Comparison of zinc with other metals
Galvanizing is a popular, reliable and most sought after method of protecting metal. However, its use is not relevant in 100% of cases, and sometimes the use of additional substances is required:
All these materials are much more expensive than zinc coating, therefore their use is irrational when working with metal structures such as power lines and fasteners (with the exception of the described areas).
If you need high-quality galvanizing of a finished metal structure or the production of zinc-coated fasteners or other metal products, order from Nedwal's! We have our own production and prices are 25% lower than in stores with finished products.
Source: https://www.nedwals.ru/%D1%83%D1%81%D0%BB%D1%83%D0%B3%D0%B8/%D1%86%D0%B8%D0%BD% D0%BA%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5
Galvanic galvanization of metal
Industrial production has long and successfully learned to improve the physical and technical qualities of steel products. One of the methods is the deposition on their surface, by electrolysis, of a thin layer of another metal, with higher resistance to atmospheric influences or mechanical and chemical loads. This process is called galvanization. As a result, the product acquires:
Of course, not every metal is suitable for this. Nickel, chromium and zinc are used for these purposes. Galvanizing or galvanizing is a very effective means of protection against corrosion.
This element not only resists destruction processes well, but is also resistant to electromagnetic influence. In addition, zinc helps the base metal to withstand mechanical damage.
In the affected area, it, as a more active element, is the first to enter into an oxidation reaction and “seals” it with a dense oxide film.
Galvanizing method
The most common method of galvanizing is with electrolytes in an acidic environment. This method guarantees excellent ability to galvanize objects of any configuration. In addition, this method reduces hydrogen embrittlement, that is, a decrease in the ductility of galvanized products.
Electric current is applied to two metals in a container with electrolyte: a steel part and pure zinc. Under the influence of voltage, the zinc anode breaks down into ions and they are deposited on the surface, forming a continuous film.
Steel, after such spraying, becomes more wear-resistant and heat-resistant. The color of the layer itself can vary (from rainbow to matte white). Its thickness is from 10 to 25 microns.
Unfortunately, despite all the undoubted advantages of this method, electrochemical galvanizing is dangerous from the point of view of the environment and human health. It produces hazardous waste, which requires expensive wastewater treatment.
Application of galvanized metals
Most often, galvanization is used for technical components and rubbing parts of mechanisms, thin-walled pipes and various small parts. Moreover, the galvanic method makes it possible to apply a coating inside them.
Galvanized metal products are also used in everyday life. For example, this is how electrical wires are protected from moisture. Without zinc coating, they would be completely destroyed in 10 years, but with it they can last at least half a century. They are also common in construction in the form of corrugated sheets, corrugated sheets and metal tiles. Hangars, garages and cabins are assembled from metal structures. And zinc-coated profiles are an integral part of sandwich panels.
Source: http://zgp1.ru/?p=2883
Galvanic galvanizing of metal: technology, equipment
Galvanic galvanizing is an effective and inexpensive, and therefore a common way to protect ferrous metals from corrosion. Most often it is used in the production of hardware and fasteners, as well as steel mesh.
Disadvantages of galvanic galvanizing
The method of applying a protective coating by electrolysis is not without its drawbacks.
The main disadvantage is the low adhesion of zinc to metal, due to which the surface of the product must be thoroughly cleaned.
Another disadvantage is the formation of toxic waste during the coating process, which requires serious cleaning.
Failure to comply with the regimes can lead to the filling of the base metal with hydrogen, which leads to fragility of the product itself and to a deterioration in the quality of the coating.
Operating principle
Galvanic galvanizing is based on the principle of protective action, which is determined by the difference in the electrochemical potentials of zinc and iron. Since zinc has a lower electrochemical potential, its coating provides protective protection for ferrous metals. That is, in a humid environment, it is he who is subject to electrochemical corrosion.
When iron oxidizes, oxides are formed that have a larger volume than the original metal. The oxide film becomes loose and allows oxygen to pass through to the not yet oxidized metal. And on zinc, during oxidation, a thin and dense film is formed; it does not allow oxygen to penetrate deep into the metal, protecting not only the coating, but also the base metal underneath.
Types of galvanic galvanizing
Galvanic zinc plating is a technology that is electrolysis, i.e. electrochemical redox processes in an electrolyte under the influence of direct electric current.
Based on the composition of the electrolyte, galvanizing is divided into three types: acid, cyanide and alkaline.
The most commonly used method is applying zinc coating in weakly acidic electrolytes, especially for cast iron and steel parts of complex configuration. Products made of carbon and alloy steels with this type of galvanizing are less susceptible to hydrogen embrittlement, and the appearance is excellent, with a remarkable decorative effect in a wide range of colors.
Additional protection during galvanizing
The protective effect of zinc coatings depends on its thickness, which during galvanic deposition is only 5 microns, and the nature of the electrolyte.
In some cases, the protective properties of zinc coating are increased by passivation, phosphating or painting.
Passivation (chromatization) is a chemical treatment of products in solutions with chromic acid or its salts, as a result of which chromate films are formed on the surface. This process enhances not so much the protective properties as the decorative ones, because as a result the gloss of the coating is enhanced, and it can be painted in various colors.
When phosphating (processing in salts of phosphoric acid) galvanized products, a phosphate film is formed on the surface. After phosphating, a paint coating can still be applied.
Galvanic galvanizing stages
In production, galvanic galvanizing consists of several technological processes, each of which is completed by washing with water in a flow bath or by brush-washing.
First, the products are thoroughly cleaned of rust, scale, process grease, coolant or paint residues and degreased in alkaline solutions. Then electrolytic degreasing occurs.
After this, they are etched in an aqueous solution of hydrochloric acid, during which the surface is finally cleaned without disturbing the surface layer and it is picked up - activated before applying the zinc coating. Only then does the actual galvanizing take place.
After this, if necessary, the products are clarified and cleaned of the oxide film in an aqueous solution of nitric acid, then phosphating, passivation and drying.
When galvanizing various products, additional operations may be performed. For example, before galvanizing, a strip is unwound, the ends are welded, straightened, and after it is oiled and rolled up.
Galvanizing equipment
A galvanic line is a specific sequence of washing and processing baths in which a single or multi-layer zinc coating with the required functional properties is created.
In accordance with production volumes, equipment with varying degrees of mechanization is used. At large enterprises, mechanized lines with automatic control are installed. There are lines with partial or full manual control, as well as mini-lines.
The galvanizing line consists of more than just baths. It includes transport systems of various designs, mandatory equipment for wastewater treatment, auxiliary equipment, which includes devices for galvanizing, heating elements, heat exchangers, cathode and anode rods.
Additional equipment includes ventilation systems, drying chambers and cabinets, refrigeration equipment, filtering units, demiwater production equipment, and pumps.
Electrolytes for galvanizing
For galvanic galvanizing, depending on the purpose of the product, electrolytes are used, which are divided into two main groups.
Electrolytes in which zinc is present in the form of simple hydrated ions are called simple acidic. These are hydrofluoride, sulfate and chloride solutions.
Complex complex acidic and alkaline electrolytes contain zinc in complex ions with positive and negative charges. These are ammonia, pyrophosphate, cyanide and other solutions.
The deposition rate and then the quality of zinc deposits on the product (cathode) depend first of all on what electrolyte is used.
Of the complex electrolytes, zinc deposits on the cathode with high ion scattering. As the current density increases, the metal yield decreases and the hydrogen yield increases.
Therefore, galvanizing in complex electrolytes is carried out at low current densities, and the coating is of very high quality, fine-grained and uniform.
In weakly acidic simple electrolytes, galvanic galvanizing, including at home, takes place at a high current density, at a higher speed than when using complex solutions. The appearance of the products is good, but the coating is not of very high quality and is only suitable for products of a fairly simple shape.
Galvanic galvanizing
The technological process of galvanizing itself takes place in a bath with an electrolyte. Products made of ferrous metal are lowered into it, to which electric current is supplied through special electrodes (cathode), and pure zinc in the form of balls or plates placed in special mesh sections (anode).
During the electrochemical reaction, under the influence of an electric current with a density of 1 to 5 A/dm, zinc dissolves in the electrolyte, then its ions are deposited on the cathode, forming a galvanic coating 4-25 microns thick.
It is with the use of this technology that fasteners (bolts and nuts) are obtained with a uniform and shiny coating.
Automated line for galvanizing
A modern galvanizing line is a fully automated line on which all stages of coating are carried out, including welding and high-quality degreasing of products for various purposes and configurations.
In general, an automatic line consists of a set of technological galvanic baths, modular rectifiers, a loading/unloading stand, transport equipment, equipment for exhaust ventilation, water supply and sewage disposal, a metal frame with a service ladder.
Galvanic baths can be made of stainless steel, steel lined with polymer materials or rubber. Modern bathtubs welded from sheet polymers are increasingly replacing metal containers. The choice of bath material depends on the composition and concentration of the electrolyte and the operating temperature.
Communications of water supply and sewerage systems, and in most cases ventilation are located under the bathtubs and are also made of polypropylene.
The dimensions of the line are determined by its productivity and the dimensions of the galvanic baths.
Galvanic galvanizing occurs with the formation of wastewater with a high concentration of heavy metal ions. Therefore, they are settled, filtered, neutralized, chemical precipitation, sorption and other processes are used in containers made of engineering polymers.
Electrolytic galvanizing at home
Do-it-yourself galvanizing begins with the selection of materials. The electrolyte can be a solution of zinc chloride and hydrochloric acid in distilled water.
This is the so-called soldering acid, which is most often used at home. Craftsmen etch zinc in battery sulfuric acid and obtain the electrolyte ZnSO4, but this process is dangerous because the reaction releases explosive hydrogen and heat.
In no case should there be a precipitate of undissolved salt crystals in the electrolyte.
Pure zinc can be bought at a chemical store or radio market, or it can be obtained from salt batteries or fuses preserved from the times of the Soviet Union.
A glass or plastic container can serve as a galvanic bath. Tripods for the anode and cathode are installed in it. The anode is a zinc plate to which the “plus” is connected from the power source.
The larger the anode, the more uniform the coating will be on the cathode, the product on which the protective coating will be applied.
There can be several anodes; they can be placed around the cathode at the same distance so that its surface is covered with zinc evenly and simultaneously on all sides. The “minus” of the power source is connected to the cathode.
Even when galvanizing is carried out at home, the technology necessarily includes thorough cleaning and degreasing of the part, as well as its activation in an acid solution.
Source: https://FB.ru/article/247122/galvanicheskoe-tsinkovanie-metalla-tehnologiya-oborudovanie
Features of the galvanic galvanizing technique
The basis of this technique is the electrochemical process of deposition of zinc from an electrolytic mixture onto steel, which is connected to the negative pole of the power source.
In order to enhance the corrosion and mechanical properties, as well as improve the appearance of the product, cadmium plating, chromating, and coating with phosphate substances are used.
It is advisable to use this technique for coating products made of carbon steel, as well as various types of cast iron. Zinc galvanizing is relevant for such steel products as:
Advantages of zinc coatings
Ferrous metals are regularly subjected to zinc treatment. This is due to the availability of the method, as well as its effectiveness. It must be said that zinc is four times cheaper than nickel, and it is also cheaper than tin.
If we take into account the use of cadmium, then it is no secret that this substance is carcinogenic, and the technology for processing with such a composition is labor-intensive. Zinc exhibits an excellent level of adhesion to the surface of steel or cast iron.
The coating obtained by galvanizing is characterized by ductility.
Subtleties of the process
The technique of galvanizing a metal structure is carried out by electrolysis with a sacrificial anode. The product being processed acts as a cathode. The anode is a pure zinc plate. It is important to place the zinc plates throughout the bath in such a way as to ensure a uniform flow of anions to the workpiece.
In this technique, the basic reagents are zinc sulfate and zinc chloride. The process also uses zinc fluoroborate. To improve the quality of galvanic processing of zinc, the mixture is supplemented with sodium, potassium and aluminum salts. The current density is responsible for adjusting the deposition rate and the maximum thickness of the zinc layer. The rate of deposition of a substance depends on the galvanic mixture, as well as its temperature.
During the technique, electrochemical dissolution of the zinc composition in the electrolyte occurs and its subsequent movement to the cathode. As mentioned above, the role of the cathode is a steel product, which must be given strength and anti-corrosion properties for many years. Specialists should monitor the anode plates and monitor for possible depletion, and salt oxide removal may also be necessary.
Devices and stages of the procedure
As for the devices used for zinc electroplating, they are no different from those used for galvanic processes.
You will need baths for galvanic galvanizing, as well as containers for the chemical preparation of metal structures. The volume of devices can reach 10 liters and even several cubic meters. Pipelines are connected to the baths, supplying and discharging water.
The pipelines are also responsible for supplying reagents and electrical contacts for supplying voltage to the anodes and cathodes.
Innovative baths are made from high-quality acid-resistant plastics.
Several successive stages of galvanic galvanizing of steel structures can be distinguished:
Each of the above stages must be controlled by specialists. Specialized companies offer zinc galvanization services in compliance with norms and standards. The workshop contains all the necessary equipment and devices that allow high-quality processing of steel products. Specialists adhere to GOST and also carry out control at every stage of work.
Basic electrolyte options for zinc electroplating
During zinc galvanization, the substance and temperature of the electrolyte at a specified current density has a direct impact on the deposition rate and quality of the zinc layer. It is worth saying that some versions of electrolyte mixtures contain substances that add shine.
Thus, the result is a product that not only has excellent strength properties, but also has a presentable appearance. For high-quality zinc galvanization, basic groups of electrolytes are used, which are also divided into varieties.
The following can be distinguished:
There are also electrolytes based on amino compounds, but they do not exhibit a sufficient deposition rate.
Why should you trust galvanic galvanizing to specialists?
If the technique is carried out with deviations from the norms and GOST, then the result may be a non-uniform, brittle and rough coating. This may be due to non-compliance with the temperature of the solution, as well as insufficient mixing of the mixtures. To prevent this from happening, you should entrust the process to experienced specialists. Professionals will carry out galvanizing at the highest level using modern baths, devices and quality control at every stage of work.
Source: https://oooecm.ru/zashchita-metalla/galvanicheskoe-cinkovanie/
Types and technologies of galvanizing
Currently, anti-corrosion galvanizing is carried out in several ways. The specific method is selected taking into account the purpose and size of the parts and the technological capabilities of the enterprise and the availability of equipment.
Corrosion rate of galvanic galvanizing and cadmium plating
Today, up to 40% of total metal production is used for galvanizing; it is the most used method of anti-corrosion protection of metal surfaces. Due to the fact that the potential of zinc is more negative than that of steel, cast iron and iron, protection occurs by electrochemical means. When exposed to volatile products of synthetic resins, drying oils and chloride-containing hydrocarbons, galvanized galvanizing coatings are quickly destroyed.
Galvanizing thickness used
To increase corrosion resistance, after galvanizing products, special chemical additional treatment is performed in solutions of chromic or phosphoric acid.
Comparative characteristics of the electrolytes used
Simple and complex electrolytes are used for galvanic galvanizing. The first include chloride, sulfate, borofluoride and others. The latter include ammonium, cyanide, amino complex and zincate electrolytes; various additives and additives can be added for improvement.
Galvanic zinc plating in simple electrolytes occurs at a fairly low polarization of the cathode; in complex electrolytes, the polarization has significant values. Galvanizing precipitates in acidic solutions with a coarse-crystalline structure. The quality improves after the introduction of various additives. In complex electrolytes, the coating is fine-crystalline, dense, and has increased performance indicators.
The specific galvanizing method is selected taking into account the operating conditions of the products and the technical capabilities of the enterprise.
The low dissipative properties of simple electrolytes limit galvanizing of parts with complex geometric shapes. Precipitation of zinc from complex solutions occurs with high dispersive power, they provide a uniform coating on complex surfaces.
Acidic (simple) electrolytes The process requires special galvanizing equipment, baths are made of stable plastics, the dimensions of the baths are regulated by state standards, and, if desired, the customer can be adjusted taking into account the characteristics of the production premises.
Depending on the size and layout of the galvanizing shop, it is possible to install lines or separate working areas for galvanizing.
Galvanizing mode and composition of chloride electrolytes
The first electrolyte is used for galvanizing in rotating installations, the second for galvanizing with shiny coatings, the third for zinc coating of rolled sheets and wires.
Galvanizing mode and composition of chloride electrolytes
Galvanizing mode and composition of boron fluoride electrolytes.
Cyanide electrolytes for galvanic galvanizing
The operating mode of galvanic baths has a great influence on the quality of deposits.
The temperature parameters of electrochemical processes are controlled automatically, the percentage of zinc is checked at the end of each work shift. Adding organic substances to solutions allows for shiny galvanizing.
Work on the equipment is divided into separate stages; compliance with the recommended parameters of each of them ensures the proper quality of coatings.
Composition of cyanide electrolytes for industrial equipment
A solution of sodium cyanide is prepared separately, subject to mandatory compliance with safety rules for working on industrial equipment. After preparing sodium cyanide, sodium hydroxide is added to the solution in small portions with constant stirring. At the final stage of preparation, the electrolyte is diluted with distilled water until the calculated concentration of zinc is obtained.
Galvanic zinc plating in solution produces significantly fewer impurities; if necessary, they are removed electrochemically as they accumulate.
Zincate electrolytesThe principles of galvanic galvanizing in zincate electrolytes differ in terms of current density. The dissociation of components occurs in steps; high values of cathodic polarization are required for deposition.
The surface of the product has a spongy structure and a dark color due to microparticles that appear due to the electrochemical dissolution of zinc anodes in an alkaline environment. To eliminate the problem, tetravalent tin compounds are added to the solution. It is allowed to use Trilon B, polyethylene polyamine, etc. for the same purposes.
Additives make it possible to obtain more complete galvanic zinc plating at increased current density parameters.
Composition and mode of zincate electrolytes
Composition and modes of chlorammonium electrolytes for galvanic galvanizing
Composition of electrolytes for galvanic galvanizing using amino complex compounds
Composition of pyrophosphate electrolytes for galvanic galvanizing
To improve the quality and stability of zinc coatings, final deposition of the top layer can be additionally performed. Chromating is most often used in industry for these purposes.
DIY galvanizing at home
Small-sized products can be galvanized with your own hands. For galvanic galvanizing, a simple acidic electrolyte is used, prepared from 200 g of zinc sulfate, 50 g of ammonium sulfate, 15 g of sodium acetate. The components are dissolved in one liter of water, the electrolyte temperature during the application of zinc coating is 18 ÷ 25 ° C, the current density is 1.5 A/dm2.
DIY equipment for galvanizing
1 – container for electrolyte. You can make it yourself from plastic.
2 – zinc anodes. The dimensions must correspond to the dimensions of the container; the quantity is selected depending on the placement of the parts being processed.
3 – galvanizing products. Dimensions and quantities must take into account the technical characteristics of the bath.
4 – electrolyte. The solution is prepared in accordance with existing recommendations for chemical composition.
The thickness of the zinc coating with your own hands is regulated by the exposure time, current density and electrolyte concentration. Galvanizing must be carried out in compliance with safety regulations; the dimensions of the equipment must ensure favorable process parameters.
Source: https://plast-product.ru/galvanicheskoe-tsinkovanie/
Galvanic galvanizing technology
Electroplating is the application of various metal and chemical coatings to metal surfaces. The most common electroplating method is galvanizing.
Galvanic galvanizing is the process of applying a thin layer of zinc to the surface of metal products in an electrolyte solution. During the electrolysis process, zinc dissolves, and its ions with a positive potential are deposited on the surface of the base metal to form a layer with a thickness of 4 to 20 microns, which accurately follows the contours of the product. The coating during galvanizing is particularly precise and smooth.
Due to the obvious advantages of TDC over other methods, TERMISHIN RUS RESECH LLC provides only thermal diffusion galvanizing services.
