Plating solution and plating method of cyanide-free plating silver
An electroplating solution and silver electroplating technology, applied in the field of electroplating silver, can solve the problems of cyanide-free silver plating not widely used electroplating silver, poor stability of the plating solution, large stress of the coating layer, etc., to improve the corrosion resistance and discoloration resistance, and the coating Low stress, simple formula effect
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Embodiment 1
[0023] The electroplating method of cyanide-free silver electroplating includes the following steps:
[0024] 1) The formula of cyanide-free alkaline silver plating solution is (using water as solvent): silver nitrate content 20g / L, ammonium acetate 70g / L, niacin 70g / L, potassium carbonate 60g / L, potassium hydroxide 40g / L, sodium phthalylsulfonimide 0.2g / L, polyethylene glycol 0.16g / L, ammonia water as a pH adjuster, adjust the pH of the plating solution to 9.5.
[0025] 2) The silver plate (purity 99.99%) is used as the anode, and the parts to be plated are used as the cathode; the following are several specific materials of the plated parts, and the corresponding pre-treatment and pre-treatment processes (the existing methods can be processed ):
[0026] The base material of plated parts is copper pre-treatment and pre-treatment process: plated parts degreasing-washing-pickling-washing-weak erosion-washing-pre-silvering-washing.
[0027] The base material of the plated parts is al...
Embodiment 2
[0031] The electroplating method of cyanide-free silver electroplating includes the following steps:
[0032] 1) The formula of cyanide-free alkaline silver plating solution is: silver nitrate content 40g / L, ammonium acetate 80g / L, niacin 95g / L, potassium carbonate 70g / L, potassium hydroxide 50g / L, phthaloyl Sodium sulfonimide 0.8g / L, polyethylene glycol 0.32g / L, ammonia water is the pH value adjuster, the pH value of the plating solution is 9.5-10.
[0033] 2) Take the silver plate (purity 99.99%) as the anode, and the article to be plated as the cathode; heat the bath temperature to 30~40℃, apply a single pulse electroplating power between the anode and the cathode to control the average pulse current of the cathode The density is 0.6~1.2A / dm 2 , The pulse width is 4ms, the duty cycle is 30%; the cathode is moved and stirred, and the plating is completed when the thickness of the coating reaches the requirement.
Embodiment 3
[0035] The electroplating method of cyanide-free silver electroplating includes the following steps:
[0036] 1) The formula of cyanide-free alkaline silver plating solution is: silver nitrate content 60g / L, ammonium acetate 90g / L, niacin 110g / L, potassium carbonate 80g / L, potassium hydroxide 60g / L, phthaloyl Sodium sulfonimide 1.2g / L, polyethylene glycol 0.64g / L, ammonia water is the pH value adjuster, and the pH value of the plating solution is 9-9.5.
[0037] 2) Use the silver plate (purity 99.99%) as the anode, and the article to be plated as the cathode; heat the bath temperature to 25~35℃, apply a single pulse electroplating power between the anode and the cathode to control the average pulse current of the cathode The density is 0.6~1.2A / dm 2 , The pulse width is 5ms, the duty cycle is 40%; the cathode is moved and stirred, and the plating is completed when the thickness of the coating reaches the requirement.
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