Process for the corrosion protection of neodymium-iron-boron group sintered magnets

摘要

Disclosed is a process for the corrosion protection of a neodymium-iron-boron group sintered magnet, which comprises the steps of: immersing the neodymium-iron-boron group sintered magnet in oxidizing acid to activate the surface thereof; plating the magnet with nickel having internal stress of not more than 1000 kgf/cm2; and applying cationic electrodeposition coating thereto.