Metal member coated with metal layers
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United States of America Patent
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-
Jul 3, 2007
Grant Date -
Mar 3, 2005
app pub date -
Aug 10, 2004
filing date -
Aug 25, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a metal member capable of realizing a corrosion resistance and wear resistance, which are equivalent to or better than those when expensive PdNi is used even if PdNi is not used, and of being produced at relatively low costs. A first layer essentially consisting of nickel and unavoidable impurities is formed on the surface of a base metal member. On the first layer, a second layer essentially consisting of nickel, phosphorus and unavoidable impurities is formed. On the second layer, a third layer essentially consisting of a noble metal or an alloy thereof is formed. The second layer contains 10 to 15 wt % of phosphorus. The thickness of the first layer is 3 .mu.m or more, and the thickness of the second layer is 0.1 .mu.m or more.
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