| abstract |
A process for producing a highly anticorrosive rare earth permanent magnet, characterized by sequentially subjecting an R-Fe-B sintered magnet to surface finishing involving cutting and/or polishing, plating pretreatment, nickel electroplating to a given plating thickness, immersion in an aqueous solution containing a phosphoric salt, washing with water and heat treatment at 150 to 400 DEG C for 1 to 24 hr in an atmosphere of 1.3X10<3> Pa or higher oxygen partial pressure so as to form a thin nickel oxide layer at the surface layer portion. |