METHOD FOR PRODUCING CORROSION-RESISTANT RARE EARTH BASED PERMANENT MAGNET, CORROSION-RESISTANT RAR

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A method for producing a corrosion- resistant rare earth based permanent magnet, characterized in that it comprises providing an aqueous treating fluid, which contains a hydrolysis-polymerization product of an alkyl silicate and fine zinc particles having an average particle diameter of 1 to 50 μm and has a pH of 6 to 8 and a viscosity of 1000 cP or less, applying the fluid on the surface of a rare earth based permanent magnet, and subjecting the resultant magnet to a heat treatment at 250°C to 400°C, to thereby form a corrosion-resistant coating film containing fine zinc particles dispersed therein; a corrosion-resistant rare earth based permanent magnet produced by the method; a dip spin coating method being suitable for forming a coating film on thin work pieces having various shapes; and a method for forming a coating film on a work piece. The method allows the stable and easy production of a rare earth based permanent magnet having, on the surface thereof, a corrosion-resistant coating film containing fine zinc particles dispersed in the film. © KIPO & WIPO 2007