PROCESS FOR PRODUCING HIGHLY ANTICORROSIVE RARE EARTH PERMANENT MAGNET AND METHOD OF USING THE SAME

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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°C for 1 to 24 hr in an atmosphere of 1.3×103 Pa or higher oxygen partial pressure so as to form a thin nickel oxide layer at the surface layer portion.