After the neodymium iron boron magnet is left for a period of time, white or other colored spots will appear on the surface, which will gradually develop into rust spots. Normally, the plating layer of electroplated magnets is not easy to appear rust spots. The reasons for the rust spots are generally as follows:

1. Insufficient electroplating time or process flow problems;

2. The dirt on the surface of the magnet before electroplating is not well cleaned;

3. The magnet is stored in a place with humidity, poor air circulation, and temperature difference;

4. Magnet oxidation caused by broken magnet packaging seal;

For the qualified electroplating products of neodymium iron boron magnets, under normal circumstances, there should be no rust spots on the surface of the electroplating coating of the magnet. NdFeB magnets should avoid the following storage methods:

In places that are too humid and air circulation is not good; when the temperature difference changes greatly, even if the salt spray test qualified products are stored in a harsh environment for a long time, rust spots may occur. When the electroplating product is stored in a harsh environment, the base layer will further react with the condensed water, which will cause the base layer and the plating layer to have a low binding force, and in severe cases, the base will be partially powdered, and then naturally peeled. Electroplating products should not be placed in a place with high humidity for a long time, but should be placed in a cool, dry place.