Electroplating solution for cyanide-free silver plating and cyanide-free silver plating method
A cyanide-free silver plating and electroplating solution technology, which is applied in the field of cyanide-free silver plating and electroplating solution for cyanide-free silver plating, can solve the problems of difficult maintenance and easy passivation of plated parts, and achieve good brightness, stability and Excellent dispersibility and smooth surface
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Embodiment 1
[0018] The formula and preparation method of the electroplating solution of the cyanide-free silver plating of the present embodiment are
[0019] The formula of the electroplating solution is: silver nitrate 40g / L, sodium thiosulfate 200g / L, potassium metabisulfite 40g / L, ammonium acetate 20g / L, thiosemicarbazide 0.6g / L, and the pH is maintained at 5-6.
[0020] The preparation method of the electroplating solution: first dissolve 200g of sodium thiosulfate in 300ml of distilled water, stir to make it all dissolve; then dissolve 40g of silver nitrate and 40g of potassium metabisulfite in 250ml of distilled water, and stir Pour the potassium metabisulfite solution into the silver nitrate solution to form a cloudy silver metabisulfite solution, and immediately add the solution slowly into the sodium thiosulfate solution to complex the silver ions with sodium thiosulfate to form a yellowish color. Clarifying liquid; then add 20g of ammonium acetate into the solution, and after t...
Embodiment 2
[0022] The formula and preparation method of the electroplating solution of the cyanide-free silver plating of the present embodiment are
[0023] The formula of the electroplating solution is: silver nitrate 43g / L, sodium thiosulfate 230g / L, potassium metabisulfite 43g / L, ammonium acetate 25g / L, thiosemicarbazide 0.7g / L, and the pH is maintained at 5-6.
[0024] The preparation method of the electroplating solution: the preparation method is the same as in Example 1, except that the addition of each component is adjusted accordingly according to the formula requirements.
Embodiment 3
[0026] The formula and preparation method of the electroplating solution of the cyanide-free silver plating of the present embodiment are
[0027] The formula of the electroplating solution is: silver nitrate 45g / L, sodium thiosulfate 250g / L, potassium metabisulfite 45g / L, ammonium acetate 30g / L, thiosemicarbazide 0.8g / L, and the pH is maintained at 5-6.
[0028] The preparation method of the electroplating solution: the preparation method is the same as in Example 1, except that the addition of each component is adjusted accordingly according to the formula requirements.
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Abstract
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