| 摘要 |
PURPOSE:To form a composite plated silver-oxide film contg. uniformly and finely dispersed metallic oxide and having the superior performance of a contact point by using a silver plating bath contg. suspended fine metallic oxide particles and by supplying a specified DC pulsating current. CONSTITUTION:A contact point material having superior wear resistance and superior characteristics of a contact point for an electric apparatus is formed by silver-oxide composite plating. At this time, a silver plating bath contg. the dispersed particles of one or more among CdO, SnO2, In2O3, ZnO, CuO, Sb2O3, La2O3, MgO, MnO2, Bi2O3 and TeO each having 0.01-1mum particle size and 40-100g/l (expressed in terms of silver) dissolved silver cyanide but not contg. other cyanide is used, and a pulsating current is supplied at 5-150A/dm<2> average current density with 50msec-5sec period in which the ratio of DC pulse is 0.5-0.9. A thick composite plated silver-oxide film is obtd.
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