RARE EARTH ELEMENT BASED PERMANENT MAGNET HAVING COPPER PLATING FILM ON SURFACE THEREOF

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PROBLEM TO BE SOLVED : To provide a method for producing a rare earth element based permanent magnet having a copper plating film on the surface thereof, which uses a novel plating solution for an electrolytic copper plating treatment and allows the formation of a copper plating film excellent in adhesiveness on the surface of a rare earth metal based permanent magnet. SOLUTION : The method for producing the rare earth element based permanent magnet having a copper plating film on the surface thereof comprises forming a copper plating film on the surface of the rare earth element based permanent magnet by the electrolytic copper plating treatment using the plating solution which is adjusted to have a pH of 9.0 to 11.5 and comprises three components of (1) : a Cu2+ ion; (2) a chelating agent exhibiting a chelate stability constant with a Cu2+ ion of ≥10.0; and (3) a chelating agent exhibiting a chelate stability constant with an Fe3+ ion of ≥16.0, (under a condition that the chelate stability constant is measured at a pH of 9.0 to 11.5). COPYRIGHT : (C)2007, JPO&INPIT