After the magnet has been placed for a period of time, white or other colored spots will appear on the surface, which will gradually develop into rust spots. Under normal circumstances, the plating of electroplated magnets is not prone to rust spots. The reasons for rust spots are generally as follows:
1. The dirt on the surface of the magnet before electroplating is not well cleaned;
2. The electroplating time is not enough or the process flow problem;
3. Magnet oxidation caused by damage to the packaging seal of the magnet;
4. The magnet should be stored in a place with humidity, poor air circulation and temperature difference;
How to avoid rust corrosion damage of NdFeB magnets?
In order to avoid corrosion damage, it is necessary to protect the surface of the permanent magnet material during use, such as electroplating with gold, nickel, zinc, and tin, and spraying epoxy resin on the surface.
NdFeB magnets are divided into sintered NdFeB magnets and bonded NdFeB magnets. Bonded NdFeB magnets are magnetic in all directions and are resistant to corrosion; while sintered NdFeB magnets are prone to corrosion and require coating on the surface. Zinc, nickel, environmental protection zinc, environmental protection nickel, nickel copper nickel, environmental protection nickel copper nickel, etc. Sintered NdFeB is generally divided into axial magnetization and radial magnetization, which are determined according to the required working surface.