| 摘要 |
PURPOSE:To maintain excellent magnetic property for a long period by applying Cu plating to the surface of an RE-B-Fe sintered rare earth magnet or an RE- TM-B hot processed rare earth magnet, and also, forming a plating of a metal baser than Cu thereon. CONSTITUTION:For a high corrosion-resistant metallic magnet, a Cu plating is made on the surface of an RR-B-Fe sintered rare earth magnet or an RE-TM- B hot processed rare earth magnet, and a plating of metal baser than Cu is made thereon. Cu is a metal excellent in hydrogen permeation suppressing effect, so it can hinder the hydrogen produced in electric plating or electroless plating from moving toward magnetic alloy, and prevent embrittlement and break of the magnet in the boundary between the plating and the magnet alloy. Moreover, the plating, which is made on the Cu plating and is made of a metal baser than Cu acts upon Cu as a sacrificed anode, and prevents the corrosion of Cu and the magnet alloy. Hereby, excellent magnetic property can gotten. |
