RARE EARTH MAGNET ALLOY

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PROBLEM TO BE SOLVED : To improve the weathering resistance of the top surface of a rare earth magnet alloy material without performing any plating or resin coating. SOLUTION : The weathering resistance of a rare earth magnet alloy is improved in such a method that the top surface of R-Fe-B-based or R-Fe-B-C-based rare earth magnet alloy (R is at least one kind of the rare-earth element, and Fe may be partly replaced with Co) is preferably brought in contact with the acid solution, followed by the solution containing fatty acid salt compound. Preferably the boric acid solution is used as the acid solution. COPYRIGHT : (C)2008, JPO&INPIT