发明名称 |
UNDERWATER USE TYPE RARE EARTH-BASE PERMANENT MAGNET AND METHOD FOR MANUFACTURING THE SAME |
摘要 |
PROBLEM TO BE SOLVED: To provide an underwater use type rare earth-base permanent magnet which exhibits excellent corrosion resistance even when used by being immersed in an oxidative electrolyte solution (etchant) having high corrosiveness, and a method for manufacturing the same. SOLUTION: The permanent magnet is constituted by forming an Ni plating film having characteristics of >=-0.1 V in natural electrode potential (to an SCE saturated calomel electrode) in an aqueous solution containing 10 ppm Cu ions and >=0 V in an aqueous solution containing 100 ppm Cu ions on the extreme surface layer of the magnet surface.
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申请公布号 |
JP2002212783(A) |
申请公布日期 |
2002.07.31 |
申请号 |
JP20010009311 |
申请日期 |
2001.01.17 |
申请人 |
SUMITOMO SPECIAL METALS CO LTD |
发明人 |
OSHIMA KAZUHIDE;ARANAE TOSHINOBU |
分类号 |
C25D3/12;C22C38/00;C25D5/12;C25D7/00;H01F41/02;(IPC1-7):C25D7/00 |
主分类号 |
C25D3/12 |
代理机构 |
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主权项 |
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地址 |
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