Environmental non-cyanide plating solution for silver-plating
A silver electroplating and environment-friendly technology, applied in the field of electrochemical silver plating, can solve the problems of low industrial practical value, increased electroplating cost, poor coating adhesion, etc., to meet the needs of electroplating industry, low raw material cost, and reduced production cost. Effect
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Embodiment 1
[0020] According to 0.15mol / L AgNO 3 , 0.6mol / L β-alanine, 0.1mol / L uracil and 0.002g / L polyethyleneimine. Dissolve each substance in deionized water to prepare an environmentally friendly silver plating solution to adjust the pH value of the silver plating solution is 13, and the temperature of the silver electroplating solution is 15°C. Immerse the copper or brass plated parts in the silver electroplating solution, adopt a one-step electroplating method, and use a current density of 0.2A / dm 2 Electroplating is carried out on the copper plated parts until the thickness of the silver layer is 3 μm. The obtained silver layer is bright and has good bonding force with the matrix.
Embodiment 2
[0022] According to 0.15mol / L AgNO 3 , 0.5mol / L cystine, 0.1mol / L isonicotinic acid, 0.05g / L polyethyleneimine and 0.05g / L benzotriazole. Dissolve each substance in deionized water and prepare an environmentally friendly silver For the electroplating solution, the pH of the silver plating solution is adjusted to be 10, and the temperature of the silver electroplating solution is 40°C. Immerse the copper or brass plated parts in the silver electroplating solution, adopt a one-step electroplating method, and use a current density of 0.2A / dm 2 Electroplating is carried out on the copper plated parts until the thickness of the silver layer is 3 μm. The obtained silver layer is bright and has good bonding force with the matrix.
Embodiment 3
[0024] According to 0.1mol / L AgSO 3 CH 3 , 0.5mol / L aminodiacetic acid, 0.1mol / L 5,5-dimethylhydantoin, 0.95g / L polyethyleneimine and 0.05g / L 10ppm Sb were dissolved in deionized water, The environment-friendly silver electroplating solution is prepared, the pH of the silver plating solution is adjusted to be 8, and the temperature of the silver electroplating solution is 40°C. Immerse the brass plated parts in the silver electroplating solution, adopt a one-step electroplating method, and use a current density of 0.2A / dm 2 Electroplating is carried out on the copper plated parts until the thickness of the silver layer is 3 μm. The obtained silver layer is bright and has good bonding force with the matrix.
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