Compared with permanent magnet materials such as ferrite, neodymium magnets (NdFeB magnets) have excellent magnetic properties and are also the most commonly used rare earth magnets. They are widely used in electronics, power machinery, medical equipment, toys, packaging, hardware machinery, aerospace and Other areas. However, neodymium magnets (NdFeB magnets) are very susceptible to corrosion. So how to avoid corrosion of neodymium magnets?
1. Phosphating
Phosphating is a process in which chemical and electrochemical reactions form a phosphate chemical conversion film. Phosphating has the following purposes:
Protect the base material from corrosion to a certain extent.
Use as a primer before painting to improve the adhesion and corrosion resistance of the film layer.
It plays the role of friction reduction and lubrication during metal cold working.
2. Electroplating
Electroplating is the process of plating a thin layer of other metals or alloys on the surface of other metals through electrolysis. The electron microscopy process is the process of using electrolysis to attach the surface of metal or other materials to a metal film, thereby preventing metal oxidation (such as corrosion) , improve wear resistance, conductivity, reflectivity, corrosion resistance and enhance aesthetic effects. In addition to gold magnets, many coins have an electroplated outer layer.
3. Electrophoresis
Under the action of an electric field, charged particles move toward electrodes with opposite electrical properties, which is called electrophoresis. The technology of separating charged particles through the different speeds of charged particles in an electric field is called electrophoresis technology. Electrophoresis is a method widely used for sintering sensitive iron boron and One of the anti-corrosion surface treatment technologies for bonded neodymium magnets. The electrophoretic coating not only has good adhesion to the porous magnet surface, but also has resistance to salt spray, acid and alkali corrosion.