Different Coatings of NdFeB Permanent Magnets 20161230
NdFeB Permanent Magnet with NiCuNi, Zn, Cr, Epoxy, Au, Ag, Parylene
As we all known, although NdFeB magnet is the strongest
permanent magnet material so far in the world, it has relatively lower corrosion resistance, therefore, it is necessary to be plated with coatings. Commonly, China Rare Earth Magnet Limited has several different coatings in the market like Ni, Chrome, Gold, Zinc, Epoxy and so on, which will influences the surface color and reserved time separately. Below is the comparison of certain kinds of common coatings.
The surface of Zn coating is always silver and white color. And the
NdFeB magnets with Zn coating is always made by barrel plating with comparatively lower price. It can be kept in salt mist for 12 to 48 hours on average. Besides, it is easy to be attached together with some adhesive such as AB glue.
Usually, the Ni coating in the market means Ni-Cu-Ni three layers, which can stand 120 to 200 hours in salt mist. It looks bright and gleaming. Particularly, it is hard to be oxidized in the air, thus, it is well-like by
permanent magnet manufacturers. But the coating is easy to fall off when be used with glues.
In the electroplating industry, chrome coating is not familiar for its high costing. But with extremely strong anti-corrosion ability, it is mainly used in environment with high PH value.
The Au coating is always used in jewelry and accessory, which makes it seems beautiful as the real gold.
This kind of coating is popular in recent year, namely, it is to add a layer of resin paint after nickel plating. It develops rapidly in various electroplated products nowadays. The greatest advantage of it is this coating can be made to whatever color you want, like black, grey, green and so on.
The high polymer material has the best protection effect to the NdFeB neodymium permanent magnets whether in the environment of acid, alkali or slat as proved.
In general, it is necessary for the magnets manufacturers to choose the most appropriate coating according different working environment.
Tags: Permanent Magnet, NdFeB Magnets, Magnet Manufacturer,
China Rare Earth Magnet Limited manufactures NdFeB permanent magnets with different coatings like NiCuNi, Zn, Black Epoxy, etc.
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