Technology of non-cyanide silver coating

A process method, a cyanide-free silver plating technology, is applied in the field of electrochemical silver plating technology, which can solve the problems of not too ideal brightening effect, poor anti-discoloration ability of the coating, large internal stress of the coating, etc., and achieve strong anti-discoloration, Good wear resistance, uniform color effect
CN1680630AInactive Publication Date: 2005-10-12SHANGHAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI UNIV
Publication Date
2005-10-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

A process of silver coating with no cyanogens at the action of magnetic field and impulse current. The main process is impulsive silver coating. Ingredients of the solution are as follow. AgNO3,50-60g / L; sodium thiosulfate, 250-350g / L; potassium, 90-110g / L; K2SO4,20-30g / L; boracic acid, 25-35g / L; brightener,5m / L. Stir at 20-40deg.C for 10min. pH of silvering solution is 4.2-4.8. Mean impulse current density is 0.5-1ms. Duty ratio is 5-15%. Orientation of magnetic field is parallel with that of impulse current. Square ratio of positive and negative pole is bigger than 2.
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Description

technical field

[0001] The invention relates to a cyanide-free silver plating process under the action of a magnetic field and a pulse current, belonging to the technical field of electrochemical silver plating. Background technique

[0002] Silver plating was once mainly used for decorative purposes, but with the promotion and application of electroplating technology in electronic devices, semiconductors, and instruments, the amount of functional silver plating has soared. So far, cyanide silver plating is still the mainstream of industrial production in the silver plating industry at home and abroad. With the continuous improvement of environmental awareness, cyanide silver plating will be gradually eliminated. The research on cyanide-free silver plating has been carried out for more than ten years. Although some achievements have been made, the technology is still immature. Throughout the history of cyanide-free silver plating, people mainly carry out research work from...

Claims

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