HIGHLY CORROSION-RESISTANT R-T-B BASED RARE EARTH MAGNET

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PROBLEM TO BE SOLVED : To provide a hydrogen-embrittlement-proof and highly corrosion-resistant surface treatment on the surface of an R-T-B based rare earth magnet (R stands for at least one rare earth element containing Y, and T stands for Fe, or Fe and Co). SOLUTION : The surface treatment includes : forming an aluminum coating with an aluminum electroplating solution using non-aqueous solvent on the surface of an R-T-B-based rare earth magnet (R stands for at least one rare earth element containing Y, and T stands for Fe, or Fe and Co); and further changing part of the aluminum coating into an oxide film through thermal hydroxidation or anodization; thereby forming a hydrogen-embrittlement-proof and highly corrosion-resistant coating. COPYRIGHT : (C)2009, JPO&INPIT