METHOD FOR MANUFACTURING CORROSION-RESISTANT RARE EARTH BASED PERMANENT MAGNET, CORROSION-RESISTANT

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PROBLEM TO BE SOLVED : To provide a stable and easy manufacturing method of a rare earth based permanent magnet which has a zinc particulate variance corrosion-resistant coat on a surface, the corrosion-resistant rare earth based permanent magnet which is manufactured by the method, a dip spin coating method suitable for coating film formation to thin works of various profiles, and a coating film forming method of the work. SOLUTION : In the manufacturing method of the corrosion-resistant rare earth based permanent magnet, basin system treatment liquid whose pH is 6-8 and viscosity is at most 1, 000 cP and which contains hydrolysis polymerized reactant of an alkyl silicate and zinc particulate whose mean particle diameter is 1-50 μm is spread on a surface of the rare earth based permanent magnet. After that, thermal treatment is performed at 250-400°C, and zinc particulate variance corrosion-resistant coat is formed.