Sintered NdFeB magnets are very sensitive to corrosion and need additional protection of the surface. Almost all magnets will be surface treated before they are sent to customers. There are several types of the coatings which are used depending on the different corrosion resistance requirements, such as surface passivation, Ni, Ni-Cu-Ni, Zn, epoxy, etc. The characteristics of standard DMEGC coatings are shown in Table 1.
Table 1. Coating characteristics.pdf | PDF |