METHOD FOR MANUFACTURING RARE-EARTH PERMANENT MAGNET EXCELLENT IN SALT WATER RESISTANCE

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PROBLEM TO BE SOLVED : To provide a method for manufacturing a rare-earth permanent magnet excellent in salt water resistance. SOLUTION : The method for manufacturing a rare-earth permanent magnet excellent in salt water resistance is configured as follows. The method includes a step for executing the oxidation heat treatment at 200-500°C after forming a Mg-containing Al film by vapor deposition on the surface of a rare-earth permanent magnet. Regarding the oxidation heat treatment, it is desirable to adopt a method for executing the oxidation heat treatment under an atmosphere that oxygen partial pressure is 1×102 to 1×105 Pa while water vapor partial pressure is 0.1-1, 000 Pa (however, excluding 1, 000 Pa). COPYRIGHT : (C)2011, JPO&INPIT