(1) The composition and operating conditions of the stripping solution for silver plating on copper and copper alloys are as follows: a) Chemical method Sodium cyanide 15 g/L Hydrogen peroxide 15~30g/L Temperature room temperature Until the time is closed b) Electrolysis method Potassium cyanide 50~100g/L Cathode stainless steel plate Anode current density 0.3～0.5A/dm2 Until the time is closed (2) Removal of silver coating on white metal The solution composition and operating conditions of the electrolysis method are as follows: Sodium cyanide 30g/L Temperature room temperature Cathode stainless steel plate Voltage 4V, anode electrolysis Until the time is closed (3) The composition and operating conditions of the stripping solution for silver plating on steel parts are as follows: Potassium nitrate 100～200g/L Ammonia 50～150mL/L Temperature room temperature Anode current density 0.5~1A/dm2 Until the time is closed |
