How to avoid the corrosion of NdFeB magnets?

Compared with ferrite and other permanent magnet materials, neodymium magnets (NdFeB magnets) have excellent magnetic properties and are the most commonly used rare earth magnets, widely used in electronics, power machinery, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. However, neodymium magnets (NdFeB magnets) are highly susceptible to corrosion. So how do you avoid corrosion from neodymium magnets? In this article, we will introduce some general methods to avoid corrosion of neodymium magnetic surface.

1604993898863847 - How to avoid the corrosion of NdFeB magnets?

1. Phosphating
Phosphating is a process of chemical and electrochemical reaction to form a phosphate chemical conversion film. Phosphating has the following purposes:

  • 1. to a certain extent to protect the base metal from corrosion.
  • 2. Used as a primer before painting to improve the adhesion and corrosion resistance of the film.
  • 3. in the process of metal cold working friction and lubrication.

2. The plating
By electrolytic plating on top of other metal surface, thin layers of other metal or alloy plating process is the use of electrolytic plating process made of metal or other materials attached to a layer of metal film on the surface of the process, so as to prevent the oxidation of the metal, such as corrosion, improve wear resistance, electrical conductivity, reflectivity, corrosion resistance and enhance the aesthetic effect. In addition to the neodymium magnet, many coins are coated with electroplating.
3. Electrophoresis
Electrophoresis is the movement of charged particles towards the opposite electrode under the action of an electric field. The technique of separating charged particles at different velocities in an electric field is called electrophoresis. Electrophoresis is a widely used in sintered NdFeB and bonded NdFeB permanent magnet anticorrosive surface treatment technology. The electrophoretic coating not only has good adhesion to the porous magnet surface, but also has the properties of resistance to salt spray, acid and alkali corrosion.

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