| 摘要 |
AN FE-B-R BASED PERMANENT MAGNET AND METAL PIECES ARE PLACED INTO A TREATING VESSEL, WHERE THEY ARE VIBRATED AND/OR AGITATED, WHEREBY A METAL FILM IS FORMED ON THE SURFACE OF THE MAGNET. A SOL SOLUTION PRODUCED BY THE HYDROLYTIC REACTION AND THE POLYMERIZING REACTION OF A METAL COMPOUND WHICH IS A STARTING MATERIAL FOR A METAL OXIDE FILM IS APPLIED TO THE METAL FILM AND SUBJECTED TO A HEAT TREATMENT TO FORM A METAL OXIDE FILM. THEREFORE, IT IS POSSIBLE TO FORM, ON THE SURFACE OF THE MAGNET, A CORROSION-RESISTANT FILM WHICH CAN BE PRODUCED EASILY AND AT A LOW COST WITHOUT CARRYING-OUT OF A PLATING TREATMENT OR A TREATMENT USING HEXA-VALENT CHROMIUM AND WHICH HAS AN EXCELLENT ADHESION TO THE SURFACE OF THE MAGNET AND CAN EXHIBIT A STABLE HIGH MAGNETIC CHARACTERISTIC WHICH CANNOT BE DETERIORATED EVEN IF THE MAGNET IS LEFT TO STAND FOR A LONG PERIODOF TIME UNDER HIGH-TEMPERATURE AND HIGH-HUMIDITY CONDITIONS OF A TEMPERATURE OF 80°C AND A RELATIVE HUMIDITY OF 90 THUS, IT IS POSSIBLE TO PROVIDE AN FE-B-R BASED PERMANENT MAGNET HAVING AN EXCELLENT CORROSION RESISTANCE.
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