Common coatings for magnets

The magnet coating treatment is mainly aimed at the special working environment of the magnet. For example, the working environment of motor magnet and iron remover magnetic rod is relatively humid, so the surface coating treatment is required. At present, the main coating technologies of magnets are: zinc plating, color zinc plating, nickel plating, black nickel plating, nickel copper nickel plating, gold plating, silver plating, epoxy resin plating.

NdFeB magnet surface coating treatment, according to the characteristics of the use of the product and the preservation of the line often different electroplating processing, the most common electroplating process is galvanized, nickel plating. The surface color of each plating layer is different. Each has its own advantages and disadvantages. 

Galvanized: the surface looks silvery white, can do12-48 hours of salt spray, can be used in some glue bonding, (such as AB glue) such as electroplating can be stored for two to five years, the advantage is that the price is relatively low.

Black zinc plating: the surface of the product is treated into black according to customer requirements. in the electroplating process, a black protective film is added through chemical treatment on the basis of zinc plating. this film can also protect the product, increase the salt spray time and prolong the oxidation time. But the surface is easily scratched and loses its protective effect.

Nickel plating: looks like stainless steel luster, the surface is difficult to be oxidized in the air, and the appearance is good, the gloss is good, and the electroplating can be passed12-72 hours salt spray test. Its disadvantage is that it cannot be used with some glue, which will cause the coating to fall off and accelerate oxidation. Now the market is mostly nickel-copper-nickel. This electroplating method does 120-200 hours of salt spray, but its electroplating cost is relatively high.

Gold-plated silver: used for magnetic jewelry, magnetic jewelry are golden yellow, silver white majority. The appearance of gold-plated magnets looks as beautiful as gold. They are generally used in the jewelry industry. Our products can also be gold-plated for magnetic jewelry. 

Plating epoxy resin: is the magnet after nickel plating and then add a layer of resin paint on the outside, its biggest advantage is that it can extend the salt spray test time.

Chrome plating: Chrome plating is generally relatively rare, and it is difficult to react with other substances because of its strong corrosion resistance. Generally applied In the harsh working environment with strong pH. Its electroplating cost is very high, the general company can not accept, so few people choose.