| 摘要 |
PROBLEM TO BE SOLVED: To provide an SUS material for a disc spring which is used for electric contact and passes a repetitive keying test repeating keying≥1 million times. SOLUTION: The metal plate used for electric contact is produced by forming a nickel-plating layer 3 on the surface of a sheet-like substrate 2 made of stainless steel, forming a≤0.5μm thickness copper-plating layer 4 on the nickel-plating layer 3 through flash plating, and forming a silver-plating layer 5 on the copper-plating layer 4. COPYRIGHT: (C)2004,JPO&NCIPI
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