RARE-EARTH PERMANENT MAGNET HAVING CORROSION-RESISTANT COATING, PROCESS FOR PRODUCING THE SAME, AN

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A rare-earth permanent magnet which has on the surface an inexpensive corrosion-resistant coating film combining excellent heat resistance with excellent adhesion; a process for producing the permanent magnet; and a treating liquid for forming the corrosion-resistant coating film. The rare-earth permanent magnet is characterized by having on the surface thereof a corrosion-resistant coating film which comprises lithium silicate and a thermoplastic resin as components and in which the thermoplastic resin is contained in an amount of 0.1 to 50 wt.%% and has been evenly dispersed. The treating liquid, which is an excellent liquid for forming the corrosion-resistant coating film, is characterized in that a soap-free aqueous emulsion of a thermoplastic resin was used and that the treating liquid contains the thermoplastic resin and lithium silicate in given amounts. The process, which is for producing a rare- earth permanent magnet, is characterized by forming a corrosion-resistant coating film from the treating liquid. © KIPO & WIPO 2007