| 摘要 |
PROBLEM TO BE SOLVED: To obtain an extremely excellent gold or gold alloy plating material small in deterioration in heat resistance, corrosion-resistance and contact resistance between gold or gold alloy plating parts, which has not been realized heretofore. SOLUTION: As an intermediate layer, alloy plating of a nickel-phosphorous- boron series or a nickel-phosphorous-boron-cobalt series is applied to deposit a film of a phosphorous compound on the surface of gold or gold alloy plating as a surface layer, and before the deposition of a phosphate film, heat treatment is suitably executed, by which an extremely good gold or gold alloy plating small in heat resistance, corrosion-resistance and contact resistance between gold or gold alloy plating parts can be obtained.
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