| 摘要 |
PURPOSE: A silver carbon plating method for a contact unit for a switch in contact with electricity is provided to extend the life span of a silver-plated switch and improve the surface resistance and durability by plating a contact unit of the switch with carbon. CONSTITUTION: A silver carbon plating method for a contact unit for a switch in contact with electricity uses a chemical solution which is manufactured by mixing AgCN(Silver Cyanide) of 30-40g/l, NaCN(Sodium Cyanide) of 100-130g/l, NaCO(sodium Carbonate) of 5-10g/l, C of 40-80g/l, a hardening agent of 2-5ml/l, and a wetting agent of 40-60ml/l to improve surface resistance, durability, heat resistance, low-temperature resistance, and wear resistance. A hardening agent of 2-5m/l and an additive of 40-60m/l are added to maintain a current density of 0.2-0.4A/dm^2 and a temperature of 7-35°C. A degreasing process of 20-60 seconds, an AgC plating process of 10-15 minutes, a tarnishing process of 1-3 minutes, and a water separation process of 3 minutes and 40 seconds to 5 minutes. Each lot takes 8-15 minutes and a plating solution is supplemented one time everyday, thereby enhancing surface deterioration.
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