NdFeB magnets have outstanding magnetic properties, and they are the most common rare earth magnets. They are widely used in consumer electronics, motors, medical equipment, toys, packaging, hardware machinery, aerospace and other fields. But metal ions on NdFeB magnet surface metal ions are very active and they are easy to react with the outside world. So how to avoid the corrosion of NdFeB magnets?
The first way to avoid the corrosion of NdFeB magnet is phosphatization, which is a metal surface treatment technology based on the principle of chemical conversion coating. The aims of phosphatization include protecting the substrate from corrosion to a certain extent, using as a primer before painting to improve film adhesion and corrosion resistance and reducing the friction and lubrication during metal cold working.
The second way to avoid corrosion of NdFeB magnets is electroplating, which is a process by electrolyzing metal ions and then coating a thin layer of other metals or alloys. Electroplating is the process of using electrolysis to attach the surface of a metal or other materials to a metal coating. And it is a process which prevents metal oxidation such as corrosion. In all, it improves wear resistance, corrosion resistance and enhances electrical conductivity, reflectivity, aesthetic properties.
The third way to avoid corrosion of NdFeB magnets is electrophoresis. Electrophoresis separates charged particles at different speeds in the electric field, which is called electrophoresis. Electrophoresis is a common anticorrosive surface treatment, sintered NdFeB magnets, bonded NdFeB magnets are used. Electrophoretic coating not only has good adhesion to the surface of porous magnet, but also has the characteristics of resistance to salt spray and acid and alkali corrosion.
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