Neodymium iron boron magnets generally require electroplating to prevent corrosion due to their poor corrosion resistance. So, what should I plating the magnet for? What is the effect of plating? Regarding the surface plating effect of neodymium iron boron coating, we should first know which neodymium iron boron coatings can be plated with?

What are the common coatings for neodymium iron boron magnets?

Neodymium iron boron strong magnet coatings are generally plated with nickel, copper, chromium, gold, black zinc, blue white zinc, epoxy resin, etc. The color of the surface of the magnet varies depending on the electroplating process, and the storage time also varies.

NI, ZN, epoxy resin: The effects of NI, ZN, epoxy resin, and PARYLENE-C coatings on the magnetic properties of neodymium iron boron magnets in three different solutions were compared and studied.

Polymer materials>epoxy resin>NI coating>ZN coating

The results show that in acid, alkali, and salt environments, the protective effect of polymer coatings on magnets is relatively poor compared to epoxy resin, with higher levels of NI coating and lower levels of ZN coating.

Salt spray testing machine

Zinc: The surface appears silver white and can be used for 12-48 hours of salt spray. It can be used for bonding with some adhesives, such as AB adhesive. If electroplated, it can be stored for two to five years.

How about plating with gold and jade

Galvanized neodymium iron boron countersunk magnet products

Nickel: It appears to be a stainless steel color, but when left in the air, the surface is difficult to oxidize. It also has a beautiful appearance and good glossiness. Electroplating can withstand 12-72 hours of salt spray testing. Its disadvantage is that it cannot be used for bonding with some adhesives, which can cause the coating to fall off.

Advantages: Beautiful appearance

Disadvantage: The coating is prone to detachment

Copper: mostly found in the hardware industry, rarely used in the neodymium iron boron industry, with a yellow appearance.

Rarely used

Yellow appearance

Chromium: The chromium electroplating industry is also relatively rare, and its electroplating cost is high, which is generally unacceptable to companies. But its ability to release decay is strong, making it difficult to react with other substances. Mainly used in areas with strong acidity and alkalinity. Usually, this is rarely chosen.

Relatively rare

Black zinc: According to customer requirements, the surface of its product is treated to black. In terms of electroplating process, it mainly involves adding a layer of black protective film through chemical treatment on the basis of zinc plating. This film can also protect the product, increase salt spray time, and extend oxidation time. But its surface is easily scratched and loses its protective effect. Nowadays, there are very few people in use, and most of them are replaced by resin.

Black in color

Mostly replaced by resin

Jin: Most of the yellow gold handpieces we see on the street at small stalls are plated with gold or copper. Plating makes the appearance of the product look as beautiful as gold, and is commonly used in the hand jewelry industry. Our products can also be gilded for magnetic jewelry.

Can be used for magnetic jewelry

Epoxy resin: It is a product that is coated with nickel and then coated with a layer of resin paint. This industry has only had a market in the past two years, and its development speed is very fast. Nowadays, many people use various electroplating products, and its major advantage is that it can achieve the color you want.

Advantages: Available in various colors

The appropriate coating should be selected based on the different usage environments. The coating of different manufacturers is different, and the main reason is the length of chamfering and electroplating time. Without understanding the quality of magnet electroplating, we should determine the quality of the coating. In fact, a simple and fast way is to look at the coating. The brighter the coating, the better the quality. Therefore, when choosing to order magnets, try to choose well-known enterprises in the industry to ensure the quality of the coating.