METHOD FOR PRODUCING CORROSION-RESISTANT RARE EARTH BASED PERMANENT MAGNET, CORROSION-RESISTANT RARE EARTH BASED PERMANENT MAGNET, DIP SPIN COATING METHOD FOR WORK PIECE, AND METHOD FOR COATING FILM ON WORK PIECE

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 mum...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHIMURA KOHSHI, OTANI TOMOIKU
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL BASIC ELECTRIC ELEMENTS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRICITY INDUCTANCES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAGNETS METALLURGY PERFORMING OPERATIONS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SPRAYING OR ATOMISING IN GENERAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSFORMERS TRANSPORTING
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Beschreibung
Zusammenfassung:	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 mum 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.