ndfeb magnets are generally required to be electroplated to prevent corrosion due to their poor corrosion resistance. So what's the best coating on a magnet? First let's find out what can be done with the surface coating on NdFeB Magnets.

Ndfeb magnetic ring gold plated

Nd-fe-b strong magnet coating is generally nickel, copper, chromium, gold, black zinc, blue white zinc, epoxy resin and so on. Electroplating is different, the color of the surface of the magnet will also be different, the preservation time also has the length.

By comparing and studying the effect of NI, ZN, epoxy and PARYLENE C coating on the magnetic properties of Ndfeb magnets in three solutions, we found that: in the environment of acid, alkali and salt, the polymer material coating has the best protection effect on the magnets, while the epoxy resin coating is relatively poor, the NI coating is second, and the ZN coating is relatively poor.

Zinc: the surface looks silver-white, can do 12-48 hours salt spray, can be used with some glue (such as AB glue), such as good electroplating words can be stored 2~5 years.

Nickel: looks like stainless steel color, placed in the air surface is difficult to be oxidized, and beautiful appearance, good gloss, electroplating can pass 12-72 hours salt spray test. The disadvantage is that can not be used with some glue, so that the coating will fall off, speed up the oxidation. Now the market for nickel - copper - nickel this electroplating way, do 120-200 hours of salt fog.

Copper: appears in the hardware industry, neodymium iron boron magnetic material industry few people use, its appearance is yellow.

Chromium: Chromium electroplating industry is also relatively rare, its electroplating cost is very high, general companies can not accept. But it has a strong ability to decay and is difficult to react with other substances. Mainly used where the ph is high.

Black zinc: the surface of NdFeb magnetic material can be treated as black according to customers' requirements. In the aspect of electroplating process, a black protective film is added on the basis of galvanizing by chemical treatment. This film can also protect the product, increase the time of salt spray and prolong the time of oxidation. But its surface is easy to be scratched and loses its protective effect. Now the use of people are also very small, mostly with resin instead.

Gold: Some of the yellow gold ornaments we see on the street are mostly gold or copper. Gold plating makes the product look as beautiful as gold, which is generally used in the jewelry industry. Our products can also be gold-plated for magnetic jewelry.

Epoxy resin: is in the product nickel plating and then add a layer of resin paint outside, the industry in the past two years to the market, its rapid development, now a variety of electroplating products with a lot of people, its biggest advantage is to be able to achieve the color you want.

In the choice of what material coating, should be based on different use environment to choose the appropriate coating. The manufacturer coating is not the same, one of the most important reason is the length of chamfer and plating time. In the case of not understanding the electroplating of magnets, how should we judge the quality of the coating, in fact, there is one of the most simple and fast way is to see the coating, the brighter the coating indicates the better quality.