What metals are magnetic?
Typically, powerful magnets are designed to find precious metals. A search magnet reacts to gold and silver quite strongly, and although it is difficult to find them in their pure form, its power is enough to pick up jewelry and coins from the ground. The main goal of all search engines is treasures, expensive coins, and sometimes just ferrous metal.
The article will describe the structure of the magnet and the basic principle of operation. He will also figure out what exactly can be found with its help and how to find expensive alloys. It will be explained in detail what ferromagnets, paramagnets and diamagnetic materials are. In addition, valuable tips and recommendations will be given that will greatly simplify the search for valuable items.
Search magnet device
This device consists of a steel case, inside of which there is a neodymium magnet. It is made from a rare alloy containing neodymium, iron and boron. This compound has a powerful attractive property. Despite its compactness, it is capable of holding things tens of times its own weight.
To make it easier to get various things, the case is equipped with a special mount. It is screwed into the magnet body via a thread. On top of the fastener there is a fastener in the form of a hook or loop that will hold the cable or rope. This mount has a rigid base that is firmly screwed into the body. The entire structure has a reliable foundation, and in this case, there is no fear in lifting any expensive and heavy thing.
Principle of operation
The search magnet has rather poor functionality. The main task of such an object is to attract as many metal objects as possible. But the device copes with its main task more than well. Thanks to its unique design, it has great strength and is able to hold quite large objects, as well as objects containing gold or silver, which ordinary magnets cannot handle.
This is especially convenient when getting things out of wells, funnels and various pits. It's also good to use this thing underwater. In water, all objects are subject to great resistance, and picking up any object becomes a rather labor-intensive task. But with a neodymium magnet, searching and removing such objects is greatly simplified.
What items can be found
When asked what kinds of things can be found using a search magnet, iron objects, including coins, immediately come to mind. Almost all paramagnetic metals can be found.
Simply put, materials that are attracted to the magnet body, but more on that later. Such coins, or precious metals, can be of great value.
For example, you can find iron coins from the period of Tsarist Russia, as well as many rare Soviet coins.
Powerful magnets can attract metals such as:
- aluminum
- copper
- tin
- brass
- lead
Most searches are carried out in attics, in various beaches and public places where people can lose things, as well as in wells and pits. In such places they usually find costume jewelry, expensive jewelry, various metal boxes, and sometimes even expensive mobile devices (on the beach). This is what finding things on land is all about.
As for water, you can also find many valuable things, including gold jewelry. Also, thanks to superstitions, a whole fortune of coins can be raised from the bottom. Moreover, there is no need to get coins from city fountains, since there are quite a lot of abandoned wells that no one needs, but they store precious things.
Does a magnet attract gold and silver?
Is it possible to find pure gold or silver with powerful magnets? No, since such metals are diamagnetic, that is, they are not attracted to magnets. But it's not all bad, thanks to all the power of neodymium alloy, it is possible to get some jewelry. Such objects usually have a ligature in them.
This alloy helps precious metals such as gold or silver acquire certain properties. For example, silver jewelry does not darken as much, but gold jewelry is more durable. But the most important thing is that the ligature allows magnetization and makes it possible to find various alloys.
But it is also possible to find pure gold or silver. At the beginning of the article it was said that iron boxes can be found. Typically, jewelry made of gold or silver is stored in such cases. So, walking through an attic or similar places, you can get rich, in the literal sense of the word.
Magnetic properties of various metals
In order to go hunting for valuable metals, you need to know what exactly will be attracted to a magnet. Since metals have different magnetic properties, and some do not have them at all. They can be divided into three groups:
-
ferromagnets
-
paramagnets
-
diamagnetic materials
Ferromagnets are metals with some of the best magnetic properties. Such metals are highly magnetic. These include ferrous metal.
Paramagnetic materials have the usual properties; they are readily attracted to a magnet, but do not have the function of magnetization. These include some alloys of jewelry and several types of non-ferrous metals.
And finally, diamagnetic materials. Such alloys are extremely difficult to respond to magnetic fields and greatly complicate the search for truly precious things. Diamagnets include gold, silver, aluminum, patina and other metals that even the strongest magnet does not pick up.
Is it possible to find gold with a magnet?
As already discussed earlier, jewelry and coins with gold can be lifted, but it is very problematic.
It is impossible to get pure gold with a magnet.
But if various factors are favorable, such as an iron box or paramagnetic jewelry lying nearby, then there is a chance to find it. Basically, only jewelry containing gold, such as bracelets, earrings and rings, can be caught with a magnet. The best places to search are sandy beaches, wells, and the sea or river bottom where a large number of people swim.
Source: https://steelfactoryrus.com/kakie-metally-magnityatsya/
Characteristics of neodymium magnets
We wrote this article to answer the question about classes of magnets, their standards, and physical characteristics.
Despite the fact that the magnets we offer are called neodymium, they can be very different from each other, because each magnet has its own physical characteristics, not just size, shape and coating. Therefore, the question of which neodymium magnets are of interest to you should not confuse you. In this article you will get answers to many of your questions.
What do the letters and numbers mean in the classes of neodymium magnets?
Often, we, as manufacturers and sellers, want to hear the technical characteristics of the magnet, namely the letters and numbers in which they (the technical characteristics) are encrypted.
And the buyer often thoroughly knows his field of application of magnets, but does not know the nomenclature, especially the international one. So, let's begin to understand the international nomenclature of magnets, namely classes, technical characteristics and designations.
First of all, neodymium magnets are divided into classes, which are designated by letters and numbers (for example, N35), which contain basic information about the magnet. Below is a standard nomenclature table of characteristics of neodymium magnets (look in the left column - the classes are indicated there).
In the table, we presented all numerical values in two units of measurement. The first, without brackets, is the measurement value in the SI system (this is the system in which our country operates), and the second (indicated in brackets) is the measurement in the international CGSE system (European standards). For your convenience, we decided to indicate both units of measurement in the table.
Neodymium magnet characteristics table
We begin to study the table from right to left. As you can see from the right column of the table, the main class difference between magnets is their operating temperature of use, that is, the permissible maximum temperature, above which the magnet begins to lose its magnetic properties. Thus, the temperature range of use of the magnet is indicated by the letter part of its marking (left column). Let's decipher these letters:
- Magnets brand N (Normal) – can be used at normal temperatures, that is, up to 80 degrees Celsius;
- Magnets brand M (Medium) – can be used at elevated temperatures, that is, up to 100 degrees Celsius;
- Magnets of grade H (High) – can be used at high temperatures, up to 120 degrees Celsius;
- SH (Super High) magnets
- Magnets of the UH (Ultra High) brand – can be used at temperatures up to 180 degrees Celsius;
- Magnets brand EH (Extra High) - can be used at temperatures up to 200 degrees Celsius.
It is worth mentioning that negative temperatures do not affect the magnetic properties of most magnets.
The numbers indicated in the magnet class designation: N30, 33M, 35H, 38SH, 40UH, etc., indicate Magnetic Energy (fourth column of the table), measured in kiloJoules per cubic meter.
This criterion of magnets is responsible for their power or the so-called “tearing force,” that is, the force that must be applied to the magnet in order to “tear” it from the surface. It is necessary to understand that the surface (steel sheet) must be perfectly flat, and the applied force must be perpendicular to the sheet.
These are the so-called ideal or theoretical conditions. It is absolutely clear that the higher the digital designation of the magnet, the higher its pull-out force.
Magnet pull-out force
But, in addition, the “pull force” depends not only on the physical characteristics of the magnet, but also on its size and weight. For example, a 25*20 mm magnet is easier to tear off a steel sheet than a 40*5 mm magnet, since the contact area of the second magnet is larger (25 mm versus 40 mm). But the magnetic field lines, if visualized, extend “further” at the first magnet (25*20 mm), which means it “clings” to the steel sheet better.
| Class | Residual magnetic induction, milliTesla (KiloGauss) | Coercive force, KiloAmpere/meter (KiloOersted) | Magnetic energy, kiloJoule/m3 (MegaGauss-Oersted) | Operating temperature, degrees Celsius |
| N35 | 1170-1220 (11,7-12,2) | ≥955 (≥12) | 263-287 (33-36) | 80 |
| N38 | 1220-1250 (12,2-12,5) | ≥955 (≥12) | 287-310 (36-39) | 80 |
| N40 | 1250-1280 (12,5-12,8) | ≥955 (≥12) | 302-326 (38-41) | 80 |
| N42 | 1280-1320 (12,8-13,2) | ≥955 (≥12) | 318-342 (40-43) | 80 |
| N45 | 1320-1380 (13,2-13,8) | ≥955 (≥12) | 342-366 (43-46) | 80 |
| N48 | 1380-1420 (13,8-14,2) | ≥876 (≥12) | 366-390 (46-49) | 80 |
| N50 | 1400-1450 (14,0-14,5) | ≥876 (≥11) | 382-406 (48-51) | 80 |
| N52 | 1430-1480 (14,3-14,8) | ≥876 (≥11) | 398-422 (50-53) | 80 |
| 33M | 1130-1170 (11,3-11,7) | ≥1114 (≥14) | 247-263 (31-33) | 100 |
| 35M | 1170-1220 (11,7-12,2) | ≥1114 (≥14) | 263-287 (33-36) | 100 |
| 38M | 1220-1250 (12,2-12,5) | ≥1114 (≥14) | 287-310 (36-39) | 100 |
| 40M | 1250-1280 (12,5-12,8) | ≥1114 (≥14) | 302-326 (38-41) | 100 |
| 42M | 1280-1320 (12,8-13,2) | ≥1114 (≥14) | 318-342 (40-43) | 100 |
| 45M | 1320-1380 (13,2-13,8) | ≥1114 (≥14) | 342-366 (43-46) | 100 |
| 48M | 1380-1420 (13,8-14,3) | ≥1114 (≥14) | 366-390 (46-49) | 100 |
| 50M | 1400-1450 (14,0-14,5) | ≥1114 (≥14) | 382-406 (48-51) | 100 |
| 30H | 1080-1130 (10,8-11,3) | ≥1353 (≥17) | 223-247 (28-31) | 120 |
| 33H | 1130-1170 (11,3-11,7) | ≥1353 (≥17) | 247-271 (31-34) | 120 |
| 35H | 1170-1220 (11,7-12,2) | ≥1353 (≥17) | 263-287 (33-36) | 120 |
| 38H | 1220-1250 (12,2-12,5) | ≥1353 (≥17) | 287-310 (36-39) | 120 |
| 40H | 1250-1280 (12,5-12,8) | ≥1353 (≥17) | 302-326 (38-41) | 120 |
| 42H | 1280-1320 (12,8-13,2) | ≥1353 (≥17) | 318-342 (40-43) | 120 |
| 45H | 1320-1380 (13,2-13,8) | ≥1353 (≥17) | 326-358 (43-46) | 120 |
| 48H | 1380-1420 (13,8-14,3) | ≥1353 (≥17) | 366-390 (46-49) | 120 |
| 30SH | 1080-1130 (10,8-11,3) | ≥1592 (≥20) | 233-247 (28-31) | 150 |
| 33SH | 1130-1170 (11,3-11,7) | ≥1592 (≥20) | 247-271 (31-34) | 150 |
| 35SH | 1170-1220 (11,7-12,2) | ≥1592 (≥20) | 263-287 (33-36) | 150 |
| 38SH | 1220-1250 (12,2-12,5) | ≥1592 (≥20) | 287-310 (36-39) | 150 |
| 40SH | 1240-1280 (12,4-12,8) | ≥1592 (≥20) | 302-326 (38-41) | 150 |
| 42SH | 1280-1320 (12,8-13,2) | ≥1592 (≥20) | 318-342 (40-43) | 150 |
| 45SH | 1320-1380 (13,2-13,8) | ≥1592 (≥20) | 342-366 (43-46) | 150 |
| 28UH | 1020-1080 (10,2-10,8) | ≥1990 (≥25) | 207-231 (26-29) | 180 |
| 30UH | 1080-1130 (10,8-11,3) | ≥1990 (≥25) | 223-247 (28-31) | 180 |
| 33UH | 1130-1170 (11,3-11,7) | ≥1990 (≥25) | 247-271 (31-34) | 180 |
| 35UH | 1180-1220 (11,7-12,2) | ≥1990 (≥25) | 263-287 (33-36) | 180 |
| 38UH | 1220-1250 (12,2-12,5) | ≥1990 (≥25) | 287-310 (36-39) | 180 |
| 40UH | 1240-1280 (12,4-12,8) | ≥1990 (≥25) | 302-326 (38-41) | 180 |
| 28EH | 1040-1090 (10,4-10,9) | ≥2388 (≥30) | 207-231 (26-29) | 200 |
| 30EH | 1080-1130 (10,8-11,3) | ≥2388 (≥30) | 233-247 (28-31) | 200 |
| 33EH | 1130-1170 (11,3-11,7) | ≥2388 (≥30) | 247-271 (31-34) | 200 |
| 35EH | 1170-1220 (11,7-12,2) | ≥2388 (≥30) | 263-287 (33-36) | 200 |
| 38EH | 1220-1250 (12,2-12,5) | ≥2388 (≥30) | 287-310 (36-39) | 200 |
How to compare the strength of magnets?
If there is a need to compare which of two selected magnets is stronger, we recommend that you use the following methods.
- With the same linear dimensions (exact method):
To understand how much stronger one magnet is than another, it is necessary to divide the value of the residual magnetic induction of one magnet (second column of the table) by the value of the residual magnetic induction of the other magnet. Example: neodymium magnet N40 with B=1250 mT and neodymium magnet N50 with B=1400 mT, we divide their magnetic inductions and get 1400/1250 = 1.12, that is, the N50 magnet is “stronger” than the N40 magnet by 12%, provided that the linear dimensions of the magnets are the same.
- For different linear dimensions (rough method):
To understand how much stronger one magnet is than another, you need to compare their masses. Example: a 30*10 mm magnet weighs approximately 55 grams, and a 25*20 mm magnet weighs 76 grams. We divide their masses 76/55=1.38, that is, a 25*20 mm magnet is stronger than a 30*10 mm magnet by about 38%, provided that their classes, that is, physical characteristics, are the same.
Magnet coercive force
And there is one unaffected column left in the table - Coercive Force (third column). Briefly, Coercivity is the amount of magnetic field a magnet must be placed in to “demagnetize” it. This value, as a rule, is very important in cases where the magnet is operated in conditions of a strong external magnetic field, as a rule, near powerful electrical components.
We hope that in this article (characteristics of neodymium magnets) you have found answers to some of your questions. We will be happy to answer other questions by phone or email, which are indicated in the contacts.
Source: https://magnit96.com/blog/article/harakteristiki_neodimovyh_magnitov/
Neodymium magnet: what does it mean and what is it made of, how to use
Using a magnetized screwdriver or screwdriver is like having an extra hand.
Inventors shop at a budget Chinese online store.
Driving screws is a task that sometimes requires a third hand. You need one hand to hold the screw, one to turn the screwdriver or operate the drill, and the third to align the objects being fastened. Nobody has three hands, but if your screwdriver can hold a screw, you can easily do most jobs with the two you have. This is one of the reasons why professional tradesmen use magnetized screwdrivers and bits.
A magnetized screwdriver also serves other purposes. This eliminates the need to hold the screw when you have to drive it into a place that is too tight for your other hand. It can also hold screws you remove from hard-to-reach places so they don't fall off or get lost. Moreover, if a screw or any other metal object falls, you can use it to retrieve it.
The main reasons for metal magnetization
Magnets are media that create their own magnetic field. Main groups of magnets:
- paramagnetic materials;
- ferromagnets;
- Diamagnets.
Steel products based on alloys of iron, cobalt or nickel refer to substances whose own magnetic field is higher than the external one, i.e. to ferromagnets. The magnetization of a substance is considered to be the sum of the magnetic properties of particles per unit volume.
At the moment the Curie temperature threshold is reached, spontaneous domains with magnetization are formed, which spread until they are completely filled. Under normal conditions, it is possible to obtain a magnetized tool when working close to electric motors, magnetrons and other elements. The metal takes away the properties of magnetism from a nearby emitter, thereby becoming magnetized.
Working with small parts with a magnetized tool can cause a lot of trouble. Sharpening metals with increased magnetism properties is impossible to ideal sizes, because... the material is covered with shavings.
Advantages
The most common neodymium magnet is one that has an iron oxide alloy, which has good heat resistance, high magnetic permeability and low cost. Equipped with color coding, high coercivity, powerful magnetic field to hold objects suspended, compact size, light weight, affordable and wide range of applications. Has a long service life.
If an ordinary magnet works for 10 years and can be demagnetized, then a neodymium magnet does not lose its properties after 100 years. Another advantage is the shape. This product has a horseshoe shape. It gives the device a long service life. As for the cost, these are expensive products, but the cost is justified by excellent performance and impeccable reliability.
Durability of work as one of the advantages
Force
It is worth pointing out that the strength contained in neodymium magnets is another advantage. She is tall and it is impossible to find a competitor to her. This is a record type of indicator, the increase of which is impossible. Power is generated during manufacturing. Magnetization occurs after the alloy is formed. Thanks to existing technologies, the alloy is magnetized in such a way that the magnet has incredibly high power and this figure reaches a record.
Note! Power is a relative philistine concept. The force is stable, but it is measured using instruments. In this case, the readings depend on the thickness of the surface and cleanliness. The separation angle can have some influence.
Strength as one of the advantages
Life time
The service life of the equipment, if used properly, is 30 years. Due to careless handling, the device may be damaged. The point is the lack of flexibility, as well as brittleness and cracking under heavy load. Falls, impacts, or reduced traction will reduce the life of the equipment. For this reason, it is necessary to avoid falls using parts that come into contact during movements.
Another extremely important point is the irreversible loss of magnetic properties due to heating. Therefore, grinding with cutting or drilling reduces the chain force and may ignite the alloy. If storage and operation are organized correctly, then magnetization is maintained for 10 years.
Long service life
Using a demagnetization device
The demagnetization device comes in three variations. The basic elements can be selected at home, using simple methods that do not require much effort to manufacture. There are special devices that can both demagnetize and magnetize an element.
Magnetometers are used in the following sequence:
- The magnetic field strength of the instrument is an important parameter that needs to be determined, because it is possible to get a negative result;
- the same parameter must be found on a magnet of the opposite sign;
- touching the tool to the area of the device will demagnetize it.
The process takes place within 10 seconds; at home, no connection to the electrical network is required. The functionality is checked as follows: the self-tapping screw is brought to the magnetized metal, and the level of magnetization is checked. Afterwards the demagnetization process occurs and is checked again.
How to use
Neodymium magnetic element is the strongest, exceeding analogues that are based on rare earth metal. In addition, neodymium is capable of maintaining a magnetized structure for a significantly long time. Such equipment can be used in various fields. For example, it is used in the manufacture of over-ear headphones with wind generators, motor wheels and scooters.
Note! Magnets are actively used in industrial, household, and medical fields. They are also used to carry out search work with a metal detector. They can often be found in plumbing fixtures or souvenirs.
Specific examples include the use of magnets in the development of medical devices, magnetic treatment of water, the creation of oil and technological filters, and the formation of actuators with highly sensitive sensors. In addition, they are needed to produce clothes with covers and shoes, and to create advertising, information and navigation materials.
Scope of application of the material
Overall, neodymium is the most powerful permanent magnetic material that has high resistance to demagnetization, attractive power, and a metallic appearance. It has a long service life and consists of boron, iron and a metal of the lanthanide group.
Methods for demagnetizing metal
There are several ways to demagnetize metal structures. Devices are used depending on the frequency of use, purpose and power. Before you demagnetize metal at home, you need to understand the existing structures.
- An ordinary magnet is large in size; a tool is held over it at a minimum distance, on the verge of the attraction process. The magnet can be removed from an old speaker, most of which are round in shape. The process is carried out when the product is removed from the structure, loosening it; the further the tool is from the structure, the smaller the amplitude. The location of the axis on which there is no magnetic field depends on the design of the product.
- More frequent use will require a device operated at home from the mains. It is possible to make the device at home or purchase it at radio parts stores. The main component is a coil of wound wire connected to a transformer. The supply of alternating current allows you to demagnetize the element, direct current - vice versa.
Removing magnetization with a magnetometer
There are many variations and kits for demagnetizing metals in production.
Tunnel devices include a coil having an opening connected to a network.
The size of the hole can be different, depending on the purpose and dimensions of the parts being processed. Multi-band magnets driven by motion, rotation of which occurs with speed control, the impact and change in amplitude is carried out by moving the part away from the body.
Electromagnets operate from a 220 or 380 volt network and allow you to demagnetize an element with a tap for a certain time. Container mechanisms allow you to install the product to a device in which the necessary environment is automatically created.
Paramagnets and ferromagnets
Let's consider the option when each atom of a substance has its own magnetic field. These fields are multidirectional and compensate each other. If you place a magnet next to such a substance, the fields will be oriented in one direction. The substance will have a magnetic field, a positive and a negative pole.
Then the substance will be attracted to the magnet and can itself become magnetized, that is, it will attract other metal objects. For example, you can magnetize steel clips at home. Each one will have a negative and a positive pole, and you can even hang a whole chain of paper clips on a magnet.
Such substances are called paramagnetic.
Source: https://instanko.ru/drugoe/kakie-metally-magnityatsya.html
Which search magnet is better to buy?
Neodymium search magnets today are actively used by treasure hunters who are looking for valuable things. Depending on the type and type, the device can have different holding weights and can be used to search for small elements or large catches.
Most often it is needed to work in places where using a metal detector is difficult or even impossible. Can also be used together.
To get the maximum result from its use, it is important to first choose the right search magnet and then use it.
First of all, decide under what conditions and for what purposes the device will be used. As a rule, these are dried up wells or lakes or rivers. Powerful search magnets are best suited for this. The more powerful it is, the heavier objects it can withstand and the greater the chance that it will be magnetized to the find.
However, there are also disadvantages of very strong magnets: they are more dangerous and more difficult to tear off. The best option for searching at depth is considered to be models with a pull-off force of 400–600 kg. At the same time, you should be very careful when purchasing; sellers often significantly exaggerate the power of the magnets.
It is recommended to buy from well-known and trusted sellers, such as, for example, the “World of Magnets” search magnet store. Otherwise, you can easily get the wrong adhesion force for which you expected, for example, instead of 400 you get 300 kg.
Unfortunately, it is very difficult to prove that the magnet was of inadequate power immediately upon purchase, since it can be demagnetized if handled incorrectly.
The use of double-sided search magnets also significantly increases the chances of magnetization reversal to a find. They are recommended for use in rivers and lakes. With such a device, you will not miss a find because the magnet “looked” in the other direction.
For use with a metal detector, weaker one-sided models are most often suitable. They will be easier to use and their strength is usually enough to check a cop.
To use a search magnet correctly, you need to understand the characteristics of the materials from which it is made.
An alloy of neodymium, boron and iron can withstand a hundred times its own weight. Using the magnet is extremely simple. It is enough to bring the device close to a metal object, and it will work immediately. Depending on the area, finds can be valuable, large, and sometimes dangerous.
Rope
Decide under what conditions the device will be used. As a rule, these are dried up wells or lakes or rivers. First you need to pick up a special rope. When choosing, look at the breaking strength. This characteristic shows how much weight the cable is designed for.
The breaking force of the rope must be at least equal to or greater than the power of the magnet. For example, for a device with a nominal force of 200 kg, a cable with a similar weight limit is suitable. You can and even need to take more in some cases.
If you plan to use a pole, then its weight should be added to the rated strength of the magnet. Also, finds will often have to be pulled out of silt, algae or sand. Water creates stress on the object, so a thick rope is definitely needed.
It is recommended to take with reserve.
For searching at the bottom of reservoirs there are rubberized cables that do not deteriorate from the influence of a humid environment.
Pole
A separate interesting device that will be useful to treasure hunters operating in swampy areas. The magnet itself is lightweight, so it does not penetrate dense silt. The magnet is attached to the end of the pole, then lowered deeper. This way you can find ancient treasures hidden at the very bottom.
Rules for working with a magnet
When working with a magnet, the following troubles may arise:
- rope break;
- slipping of the device from the smooth surface of a large object;
- loss of the device itself due to unreliable fastening.
To ensure safe, high-quality and successful searches, it is necessary to pay attention to all these points and take measures to eliminate them. It is important not only to choose a rope, but also to secure the device correctly and use the correct casting technique.
Ways to bind a search magnet
There are several effective knots that are often used to tie a magnet for searching: nautical, academic, surgical, constrictor. The first is the most popular, which is mainly used. The rest are often tied as additional ones, alternately, for greater strength. This way the magnet will never get lost.
Even this excellent device has its weaknesses. In total, such a magnet has 2 minuses. These shortcomings are easily solved, so they rarely become a reason to refuse a purchase.
- Heat. This alloy tolerates elevated temperatures extremely negatively. More than +80 is lethal for its unique properties. The most suitable mode varies from -50 to +50.
- High humidity. Most often, a magnet is used under water, in conditions of complete immersion. This does not affect the magnet itself, but at the same time the shell quickly corrodes. The problem can be solved by simply maintaining the device. After each use, you need to clean off any rust that has appeared and remove any remaining water. Do not store in a place with high humidity.
Basic Precautions
Be careful when handling neodymium search magnets. This is a powerful and serious device that disables equipment and causes injuries in a couple of seconds. The magnetic field easily deletes information from bank cards, hard drives, and breaks pacemakers.
Be sure to use additional hand protection. Since the devices develop a large magnetizing force, your hands may suffer. The two search engines have double the strength and easily crush the fingers between them.
Magnets can stick to metal items at high speeds, even through a pocket. If you carry it in your hands by the ring and walk past a metal structure, you can easily get a fracture of the phalanx.
The magnets are incredibly fragile, although they have a high power rating. If dropped or suddenly released for gluing, it may simply crack and lose its properties.
Use in difficult conditions
The most valuable and interesting finds are hidden in places inaccessible to humans. Search magnets are designed for use precisely in those places where a metal detector cannot reach. The magnet is lowered to a depth on a special rope. To do this, it is most practical to use a double-sided device with side mounting. It is thrown into the water like a drag, from a boat or from the shore.
The magnet works best at a distance of no more than 10 cm. This way, even the largest elements will be captured.
On sand or land, the catch literally flies out on its own. Underwater, among the silt, it will be a little more difficult. Therefore, you need to bring it closer and pull harder. If an object is stuck in the ground, it must be dug out manually. Large items are retrieved using a special automated winch. Coins, keys, badges, weapons are quite easy to pick up, it does not require special skills.
Features of transportation and storage
A strong magnetic field damages equipment and electronics. To minimize the possibility of damage, follow safety precautions during storage and transportation.
Source: http://3Monety.ru/blog/kakoj-poiskovyj-magnit-luchshe-pokupat/
Information about neodymium magnets
A neodymium magnet is an alloy of boron, iron and neodymium. For more than 20 years, scientists have been developing a neodymium magnet . The result was a magnet with high adhesive force. Its properties surpass all known magnets.
Advantages and disadvantages
The main advantage of neomagnets over ferritic magnets is power. The adhesion force is measured in thousands of kilograms. They are several tens of times more powerful than ferritic alloys. The attractive force of neod magnets is 50-300 kg. The service life of a neod magnet is more than thirty years. Over ten years it demagnetizes by 1%.
Due to its properties, this alloy is widely used in everyday life. Despite their popularity, neodymium magnets also have a number of negative aspects:
- high demagnetization speed;
- processing complexity;
- instability to high temperatures (if the temperature is specified by the manufacturer, the magnet will irrevocably lose its properties);
- instability to physical activity
VARIETIES
The shape of neodymium magnets can be:
- ring-shaped;
- rectangular;
- spherical;
- in the form of a disk;
- in the form of a cube and more.
The choice of shape depends on the purpose of the neodymium alloy.
It should be noted that components of neomagnets can be converted into flexible magnetic sheets, often used in the production of refrigerator magnets and souvenirs. To give any unusual shape you will need special equipment. Neomagnets are distinguished not only by shape, but also by adhesion force, size and maximum operating temperature.
What does adhesion force depend on?
Magnetic energy is static; when the dimensions of the alloy change, it does not change, as it might seem at first glance. Adhesion strength depends on:
- air humidity;
- size of the working side of the magnet;
- magnetic properties of metals;
- the presence of a metal case;
- magnet size;
- frequency and curvature of the metal surface.
So, the larger the working surface area and the larger the dimensions, the stronger the force of attraction of the magnet to the metal surface will be. If there is rust or unevenness on the metal surface, the adhesion force will drop, but the magnetic energy will not change.
TECHNOLOGY
Most neomagnets that go on sale are made by sintering in special furnaces. Manufacturing technology is a complex process taking place in a vacuum or inert atmosphere. Production process:
- At the first stage, all the constituent elements of the alloy (boron, iron, neodymium) are converted into powder.
- Then the powder is pressed and given the desired shape.
- Next, set the direction of the magnetic field.
- The powdered ingredients are then placed in ovens. Sintered and magnetized.
At first glance, the technology for manufacturing neodymium magnets may seem simple and easy.
But that's not true. Manufacturing will require not only the labor of dozens of people, but also special equipment. Manufacturers are faced with the task of not only making a magnet of the desired shape and generating a magnetic field of the required strength. Many may also need more unusual properties, such as resistance to high temperatures.
Source: https://magnitof.com/informacija-pro-neodimovye-magnity/
How to choose the right search magnet - an objective rating of the best search magnets for any purpose
The search magnet is a round device with a steel body equipped with a neodymium core of varying power. It is used for “fishing” for scrap metal, silver, gold items and jewelry. There are many types of units, each of which differs in power, weight and design.
How to choose a search magnet
Search magnets differ in design, use cases, weight, power and size. Such diversity takes a beginner by surprise. Techniques and life hacks for successful “magnetic fishing” will help you choose a search magnet.
Single sided or double sided
There are two main types of search magnets used in different directions. The choice depends on the conditions of use, so before you buy a single-sided or double-sided unit, it is important to compare their advantages and disadvantages:
| Characteristic | Single sided magnet | Double sided magnet |
| Grip on object | The find is magnetized at the end, so even when working on a rocky bottom, the likelihood of unhooking is low. | Thanks to two working surfaces, it easily attracts an object, but is more likely to be lost when colliding with an obstacle. |
| Terms of Use | The unit is perfect for “vertical fishing”. It is more convenient to search while in a boat or on a bridge. The magnet enters perpendicularly into the water without turning over. | A universal magnet with a double surface that can be used in any environment. It will attract objects, even upside down. |
| Weight | The lightweight device is great for long searches. | A double-sided magnet is a third heavier than a single-sided one, which leads to rapid fatigue of the search engine. |
| Design | It has one eye-bolt fastening and a single working surface. | Equipped with two surfaces and fastenings. |
What weight of search magnet to choose
The average weight of search magnets is 0.2-4 kg. In your arsenal you need to have a unit with a force of attraction of at least 100-200 kg. By purchasing such a device, a search engine will be able to lift a flat metal plate with a smooth and clean surface or small objects from the bottom. In real conditions, fouling with silt, algae, and current weakens the effect of the magnet. As a result, it turns out that having an attractive force of 100 kg, the structure will overpower an object weighing no more than 7-10 kg.
Based on reviews from owners, it is better to choose a magnet with more powerful characteristics - 200-400 kg. They will magnetize interesting things, bypassing priceless pieces of hardware.
You can also buy a magnet for searching in water to make money, but in this case you will need a power in the range of 600-800 kg. Despite their modest weight, they are able to overcome mountains of metal. With their help you can find bicycles, motorcycles and remains of cars.
Table of sizes and main characteristics of search magnets
|
Objective rating of search magnets
At the moment, the absolute market leaders are:
- Forceberg F-200 . A model that rightfully tops the list of the best search magnets due to its characteristics. Despite its modest dimensions, it provides traction of 220 kg. And two eye bolts are used to separate the magnet from the find and make searching easier. Wear less than 1% in 10 years.
- Redmag F-200 . The modification is famous for its compliance with the specified power declared by the manufacturer. The maximum tensile strength of the presented model is 200-225 kg. An improved design made of metal and neodymium, with the addition of iron and boron impurities, strengthens the assembly several times, giving it additional strength. Used to extract scrap metal from water, soil and even construction waste
- F-300 Superpower . The model is designed to search for steel objects and scrap metal. In calm conditions (in the absence of current), the unit is capable of pulling about 200 kg, in other cases the figure decreases several times. The device weighs 1.9 kg. This modification is perfect for beginner search engines.
- Nepra F-200 . Improved unit with additional corrosion protection. Nickel plating and galvanizing of the cup extend the life of the magnet, protecting it from rust. The maximum adhesion force is 200 kg, it is achieved only in ideal conditions, and decreases when immersed in a body of water. Among the disadvantages, in comparison with competitors, we can highlight the rate of loss of attractive forces - over 2% over 10 years.
You need to select and buy a magnet based on the specific application. For beginner searchers, a basic lightweight model with a low attractive force is suitable. More experienced fishermen should pay attention to the updated modification for retrieving large finds.
What can you catch?
Fragments of historical monuments - knives, weapons from the times of the Great Patriotic War - are often recovered from the bottom of lakes and rivers. A magnet with good attractive force will pull out hidden treasures in wells and garbage pits. Cossack sabers were repeatedly raised from the Dnieper. All products containing iron and ferromagnetic metals will be attracted to the magnet.
Pure gold is not magnetized, but such jewelry also contains a ligature (a mixture to impart strength). For example, products of 585 standard contain 41.5% other metals, including nickel, which is highly attractive.
You can also find silver, but not all its varieties can be raised. Sets of past centuries, with the addition of ligature, are often mined from the depths of centuries-old lakes.
Stainless steel is magnetic to varying degrees, depending on the alloys added. Aluminum, brass, bronze, tin, lead and copper will not be attracted.
Often in your finds you can find metal sealed cylinders worn by German soldiers. They kept their valuables in them.
Places to find relics
Ideal search places are military crossings and centuries-old bridges. Valuable finds can be discovered when examining mill whirlpools and pre-revolutionary wells. The drains, cesspools and station toilets surprise you with their artifacts.
Search for valuable coins
Only cheap royal change will not be attracted to the magnet, but medium-denomination coins made with an admixture of nickel and chromium will delight their treasure hunter. You shouldn't count on expensive coins, because... They were made of gold and silver, which means they are very weakly magnetized.
Search Magnet Care
To use a search magnet for a long time, it is important to properly care for it. There are no special requirements for processing the coating, but you need to wipe it with a dry cloth and clean it of small adhering metal particles.
The magnet is a fairly reliable tool; its service life depends on the characteristics of its use. Over a decade, it loses no more than 1% of power.
Do not hit or heat the device. When exposed to temperatures above 80 °C, it will lose its magnetic properties and turn into a useless piece of metal.
Important! The design negatively affects the operation of electronics; the damage radius depends on the power. When searching for artifacts, you should keep smartphones and laptops at a safe distance, and it is better to store search magnets in special bags (more details below).
Demagnetization of search magnets
Even the most powerful magnets lose their properties over time. Ferrite products will last for several decades, but neodymium products will last 200-300 years.
Causes of involuntary demagnetization:
- Heat. When heated above 80 ⁰C, the magnet will completely lose its attractive force. Only some models have increased resistance to temperature changes and can withstand up to 200 ⁰C.
- Strong blows. Mechanical impacts on a magnet (impact, falling from a height) deprive it of its value.
- Errors when cutting and drilling. Strong pressure when processing a magnet with a grinder can lead to loss of characteristics.
- Impact of external factors. When exposed to a magnetic field with an induction of about 3-4 Tesla, the magnet can be demagnetized.
It will be possible to restore the lost properties only in large-scale production using an industrial magnetization installation.
Accessories for search magnets
Thanks to proper use, transportation and storage, the search magnet will last a long time and will not lose its properties ahead of schedule. Accessories protect the unit from environmental influences and ensure efficient use and transportation.
Ropes for search magnets
Chinese cord and clothesline are the first step to failure. They only look very strong, but in practice they will break during the first dive. An “accident” will happen even if the object is too heavy or simply caught on a snag.
In order not to lose the magnet on your first “fishing”, you need to use a very strong rope. When choosing, it is important to consider its characteristics. For example, if the search involves a magnet capable of pulling out an object weighing 400 kg, then the breaking capacity of the cord should be no less. Particular attention should be paid to the diameter; it should be at least 0.4-0.5 cm. But the length depends on the scale of the search; rope of 10-15 meters is in great demand.
Ways to bind a search magnet
The main secret of success is proper lacing. Initially, you need to tie the magnet with a constrictor knot, use a surgical one a little higher, and secure it all with an academic one. Pull and cauterize the end. Tie the cord on your hand so you don’t miss it when casting.
Bags for magnets
Bags for search magnets with shielding are an indispensable accessory for any treasure hunter. It is made of wear-resistant material with sewn-in steel plates to isolate the magnetic field. A person will be able to move the unit without the risk of accidentally magnetizing it in the wrong place.
The bag is quite durable and perfectly protects the magnet from external damage, simplifying transportation.
Search Magnet Alternative
Magnetic trawls are devices with an elongated horizontal working surface, designed from a special rare alloy of neodymium, iron and boron for work in difficult conditions. The device is covered with stainless steel and applied using a special technology. This is done in order to protect the magnet itself from damage.
conclusions
Before purchasing a magnet, you need to decide on its purpose and the subject of your search. For “fishing” from a boat or bridge, a small one-sided device is suitable; it is especially popular among beginners. The double-sided unit has better characteristics and can be used in various adverse conditions. For an ordinary amateur, a magnet with a low attractive force of 300-400 kg will be suitable, but for a professional – from 500 kg and above.
Source: http://urklad.ru/poiskovye-magnity/kak-pravilno-vybrat-poiskovyj-magnit-obektivnyj-rejting-luchshih-poiskovyh-magnitov-pod-ljubye-celi/
What metals does a neodymium magnet attract - Metalist's Guide
Searching for coins and treasures with a “search magnet” in water (river, well, lake, etc.) and in the ground (attic backfill, beaches) is gaining great popularity. Why ?
In this article I will tell you: which coins can be magnetic and which cannot? what types of magnets are there? how to search with a search magnet? What can you find with a magnet, and in what places can you find something worth 100%?
Anyone who has decided to sell the found ferrous metal is advised to read our article.
What metals does the “search magnet” attract?
A search magnet will not attract precious and non-ferrous metals in their pure form (gold, silver, copper, aluminum), since they are not “ferromagnetic”. A magnet can attract: iron, cast iron, steel, nickel.
For those who are going to use a “search magnet” to look for coins and treasures, as a consolation (to add optimism, so to speak), I want to say that: firstly, the coins may be in an iron case-box (according to statistics, all the treasures found were located there), secondly where have you seen coins made from the same metal?
In many cases, this is an alloy of ferrous metal with non-ferrous metal (the photo is one hundred percent proof of this, coins on a magnet, most likely a copper-nickel alloy, it’s hard to see, but I think Tsarist Russia).
Precious metals are a different matter, and gold and silver are fused reluctantly, one might even say not at all.
Modern coins, some Soviet coins (mainly 1, 2, 3 and 5 kopecks), and some Tsarist coins are especially well magnetized.
The magnetic properties of a coin are higher, the more iron or other ferromagnetic is in the copper alloy (well, at least 1.0 - 2%).
As for the magnetic Royal coins, I recently read a small article about this (I don’t remember where), that at the Yekaterinburg Mint at one time a lot of copper magnetic coins were minted.
The reason for this was that copper with a high iron content was mined at one of the mines, so coins made from this ore are fully attracted by a magnet.
It is also known that some coins of Anna Ioannovna, and coins of 1 and 2 kopecks from 1811-1843 are magnetic, and the latter are generally a ternary alloy (copper-nickel-zinc).
I advise you to have a very strong magnet (preferably made of non-bium) to search for coins.
What types of search magnets are there? Where can I buy them?
Search magnets have different weight holding strengths: 200, 300, 400, 600, or 1600 kg. Magnets can also be single-sided or double-sided. The second option is preferable, since the metal attraction area is available on both sides.
You can buy a magnet in an online search equipment store, for example, double-sided with a force of 120 kg, it costs only 1.5 thousand rubles, for a magnet with a force of 600 kg, you will have to “fork out” 5,800 rubles.
The only obstacle to purchasing a search magnet is delivery (after all, under the conditions of delivery by Russian Post, it is strictly forbidden to send magnetic materials).
A search magnet consists of three parts: a body, a magnet, and a bolt-loop (a cable or rope is attached to it).
Safety precautions when working with a magnet are very important: do not insert any parts of your body between the magnet and the metal, as you can be seriously injured (in some cases, even fractures); when transporting, make sure that it does not come into contact with metal parts of the machine, do not heat the magnet, as at temperatures above 80 degrees Celsius, it can demagnetize; after use, wipe it with a dry cloth to avoid corrosion.
Where to look to find something “worthwhile”?
You can search with a magnet: in natural reservoirs, wells, swamps, on sandy beaches, in powder in the attic.
There can be a lot of metal finds on the beaches: modern small change (modern 10 rubles are especially well magnetized), keys, corks, etc.
When searching in the attic, we advise you to comb the area first with a magnet so as not to rush into hundreds of metal detector signals; there are a lot of metal objects there.
In order to optimally search for valuables in the water, you need to take the choice of “fishing” place very seriously. My advice to you is to look for the place of an ancient beach, or a place where, according to the stories of the guards, people took water, washed, and swam.
Usually there is sandy soil, a convenient descent, and a flat shore area.
Also, don’t forget the tradition of throwing coins into the sea on vacation so that you can come back again, or into the river “for good luck.”
Take old maps and overlay them on modern ones (I tell you how to overlay them here), look for ancient flooded villages, buy a magnet and a boat, and go ahead to search for valuables.
By the way, if you sell scrap metal along the way, you will always be in the black.
Finds in the water will be the following: nails, irons, knives, coins, rings, shovels, axes, fish hooks and other metal objects.
Yes, move electronic devices away from the magnet, as it can strongly influence them with its magnetic field.
Good luck with your “catch”. Read our blog
Source: https://ssk2121.com/kakie-metally-prityagivaet-neodimovyy-magnit/
Device for adjusting the magnetic field from metal objects
Strictly speaking, this is not a magnet, but rather an electromagnet, with the help of which you can initiate and configure any magnetic radiation, even quite weak ones, to be captured by appropriate devices. It is not easy to build such a device, but the authors, citizens of Australia, have no doubt about its effectiveness.
That's why they patented their invention in their patent office. Based on the fact that Australian soil is not much different from domestic soil, we will give a description of the device and operating principle of such a magnet for gold and silver.
Although it is necessary to repeat - in the generally accepted sense, this design has nothing .
The operation of the device is based on the well-known physical fact that when any object that generates magnetic oscillations in an alternating electric field moves, changes occur inside the trapper circuit associated with the movement of atoms around the nucleus.
If the area of electric field generation is sequentially moved along or across the magnetic field from a metal object, changes will occur in this area, the intensity of which determines the degree and strength of the interaction of two fields - magnetic and electric.
The difficulty is that strong magnetic fields are not created by noble metals . It is known, for example, that, according to the principle of decreasing, the electrochemical potentials of non-ferrous metals are located as follows (we consider only the area of interest to us): copper → mercury → silver → palladium → platinum → gold.
Thus, if the expression “is copper attracted to a magnet” may still have some basis, then the phrase “magnet for gold” does not make any sense at all.
It is more correct to talk about an electromagnetic trap, which will record the fact of a coordinated change in electric and magnetic fields in a certain, rather local, metallic volume.
— how copper interacts with a magnet:
Recording of changes that occur in the apparatus under the influence of such fields is captured by the measuring circuit. It is a highly sensitive spring made of rhenium, a rare metal that is absolutely insensitive to temperature changes. The rhenium spring must be adjusted to operate.
The process is to set the conditional zero of the device, for which it is placed as far as possible from all metal objects. In urban areas, such a “search magnet for gold, silver and other precious metals” will not work. However, search engines are much more likely to look for gold, platinum, copper, silver, etc.
in old abandoned rural estates
With any movement of the device, a similar action occurs with the electric field, while the magnetic field remains constant in coordinates. Therefore, the resulting movement of the spring will also be different.
Where it turns out to be most intense, its source is almost certainly located - the magnetic field. Another thing is that this kind of search magnet for non-ferrous metals will not be able to show which metal is hidden under the thickness of wood or earth.
But the device will definitely show that there is metal there.
Any metal can be detected by a magnetic field
The principle of operation of such a pseudo-magnet is similar to the coils of a metal detector, with the only difference being that the “magnet” will be tuned to only 1 metal and this is in theory - but we don’t know how it will behave in practice, BUT, most likely, it’s cheaper, faster and simpler will use an ordinary metal detector to search for non-ferrous metals, since not a single wizard has yet invented a magnet for non-ferrous and precious metals, maybe because there are no wizards!
How to assemble and set up
It will be very difficult to find/buy a rhenium spring, but all other parts of the device are quite accessible for making yourself. The sequence is:
- A steel axle is made from a thin-walled steel pipe with a diameter of no more than 16 mm. Its length should not be less than three diameters, otherwise the change in the magnetic field cannot be detected.
- A frame is made from thin copper or brass wire. The authors do not describe its dimensions, but, based on the dimensions of the tubular axis, it should be at least 200x200 mm. The frame must be sufficiently rigid.
- Three (as many as possible) holes are drilled in the tubular axle at equal distances, in which the wooden axles are placed.
- Thin-walled wooden disks are made, the number of which must correspond to the number of holes drilled in the axle. Obviously, discs can also be made of plywood: what matters is the mass of the disc and its absolute immunity to magnetic fields.
- The central sectors of each disk are covered with metal foil made of the metal that will be searched. Thus, a search magnet for non-ferrous metals - copper, gold and silver (platinum is searched for much less frequently) should have three sets of replaceable wooden disks.
- The frame with disks must be able to move freely along the entire tubular axis with fixation in a certain place. If the fits of the mating parts are made with the required accuracy, then there should be no swaying of the frame when it moves.
- To create a magnetic trap, plates from an old transformer are used, which are packed into the frame outline. The distance between adjacent plates should not exceed 1.5 mm in thickness and 56 mm in length. Such plates form the screen of the device that perceives magnetic radiation.
- Next, assemble the magnetic coil. You will need a solenoid made of 600 layers of enameled wire, which is connected to an alternating current voltage source. The winding should be multilayer, this will reduce the parasitic capacitance of the coil and make the device less inertial.
- A ferromagnetic or - which is better - a ferroelectric core is inserted inside the coil.
- By connecting this structure through a step-down transformer, a constant position of the frame with the plates is achieved relative to the wooden disks. This will be the conditional zero of the search “magnet” for non-ferrous metals.
The easiest way to check whether a search “magnet” attracts gold and silver is on a real object made of these metals. At the same time, it will be possible to establish the practical sensitivity of the device.
about how a search magnet does NOT magnetize gold, silver and other coins
Source: https://respect-kovka.com/kakie-metally-magnityatsya/
Neodymium magnet N52 D60x40 super strong round magnet 250kg rare earth strong permanent powerful magnetic iron body
Product Description
D60 * 40 mm N52 + Maximum capacity of steel cup = 250 kg
The magnet is fragile and this product combination protects the magnet from damage and rust.
If the highest possible tension force is required, then neodymium magnets are the answer to your magnet needs
This is our real magnet
Product details:
Shape: Disc Brake
Dimensions: D60x40mm = 250 kg
Material: neodymium permanent magnets
Grade: N52 + steel bowl
Maximum operating temperature: 80 degrees Celsius/176 degrees Fahrenheit
Plating: Nickel + Copper + Nickel Three-layer plating
1. The pulling force will be maximized when pulling from the vertical direction with the surface of the magnets.
2. The traction force will depend on many factors: material material, effective contact area, surface smoothness, traction direction, temperature, material type, thickness, flatness, friction level, etc.), its quality (such as rust-free), its size (thickness plus total surface area), etc.
Note:
Material: NdFeB magnets (neodymium
About Us:
We are mainly producing mid and high-end NdFeB permanent magnets and research and development of NdFeB magnetic material .
We have been working on magnetic materials for more than 10 years . We are a professional online retailer in China.
We stock over one million magnets in various sizes. Most orders can be processed within 24-48 hours.
Customization is possible, but it will cost more for less quantity.
For any information, please contact us at any time. We will reply as soon as possible.
Thank you!
Source: https://ru.aliexpress.com/i/33015235741.html
Properties and advantages of magnets for searching for gold and silver
Many adventurers want to find precious metals in the ground rather than buy them. The idea is not without meaning, since in the past people often hid all their most valuable things in the ground, and now real treasures are sometimes found in their summer cottages. A search magnet for gold and silver will help facilitate the search procedure. Having purchased such a magnet, you can tie it to your equipment using a repair bolt or rope.
Search magnet
What can you find with a magnet?
Gold and silver are very difficult to find using a magnet. A search magnet searches in the ground only for ferromagnets, i.e. those metals that have the property of being attracted to a magnet. Among them:
- copper;
- aluminum;
- brass;
- silver;
- gold;
- turquoise, precious stones;
- tin;
- lead.
Their opposites are diamagnetic materials. Of course, pure gold and silver cannot be found using a magnet, since these metals do not react to it. But often the device helps to detect precious jewelry. And all because a ligature is added to their composition.
A ligature is a metal or an alloy of metals that is included in jewelry to give it strength or certain properties. A product with the addition of a ligature has its own sample. Fineness is the amount of pure precious metal in a product, expressed as a percentage.
The most popular standard is 585; rings with cubic zirconia and other precious stones, chains, and bracelets are made from it. The purity of such products is measured in some countries not by sample size, but by carat.
To convert carats to grams, you need to know that one carat equals 200 milligrams.
For example, a ring often contains nickel. Of course, this metal is not the best for use in jewelry, but it helps reduce the price of jewelry. It is to nickel that the magnet will react. It is advantageous to look for metals at the bottom of rivers or other bodies of water, since they are on the surface. For such purposes the following were developed:
- double-sided magnet;
- magnet trawl;
- one-sided magnet.
Operating principle
All devices have their advantages and disadvantages. A trawling magnet is suitable for large areas, and a single-sided magnet is suitable for limited metal searches nearby, a cubic zirconia ring can be found with just such a device. In addition, the magnet corrodes over time, and the force of attraction decreases. But manufacturers thought about this situation and began to cover search magnets with a layer of aluminum, zinc or other polymer.
The strength of the magnet is determined in gauss; a steel plate and a dynamometer are used for the procedure. But the indicator itself is approximate. If you combine several magnets, their field will increase, but not twice, but by 30%. A regular magnet has both poles of equal strength.
Neodymium magnet is considered the strongest. But even it has limitations in terms of magnetic properties. For example, temperature conditions. The device cannot withstand more than 80 degrees Celsius; if used in this mode, it loses power.
How does a search magnet work?
Among the finds using a magnet you can find:
- scrap metal - it is for these purposes that magnets are most often used;
- low-grade jewelry with admixtures of ferromagnetic materials, among them there may be items made of turquoise or with the addition of other stones;
- metal devices.
Magnets are absolutely “indifferent” to stones. Because gemstones are crystals and are not magnetic. And jewelry, in general, will not affect the magnet. Therefore, if you want to find a worthwhile decoration, you either need to spend a lot of time or know the places where they are hidden.
Therefore, the price of a magnet is more expensive than a ring with cubic zirconia, turquoise, and other budget jewelry. Before purchasing a device, think about the purpose for which you are buying it. Then go to stores and compare the cost of the magnet with the price of the finished product. To assess the profitability of searching for metals, it would be useful to find out the prices for purchasing scrap metal, and then calculate your finds in grams and find out when the cost of the magnet will pay off.
We recommend other articles
Source: https://DedPodaril.com/interesno/poiskovyy-magnit-na-zoloto-i-serebro.html
