Cyanide-free bright silver plating electroplating solution

Abstract

The invention relates to a cyanide-free bright silver plating electroplating solution which is characterized by mainly consisting of silver nitrate, potassium thiosulfate, potassium metabisulfite, potassium sulphate, boric acid, sulfuric acid, brightener, deionized water and the like. The cyanide-free bright silver plating electroplating solution does not contain cyanide, the coating is bright in mirror surface, a cyanide silver plating effect can be achieved, and the cyanide-free bright silver plating electroplating solution has the characteristics that the coating has less possibility of discoloring, and the solution is low in brittleness and high in adhesion force.

Description

technical field [0001] The invention relates to a cyanide-free bright silver-plating electroplating solution, which belongs to the field of metal material surface protection. Background technique [0002] Silver plating is a kind of precious metal electroplating, because the cost of silver plating is relatively lower than that of gold plating, and it has high conductivity, light reflection and chemical stability to organic acids and alkalis, so it is widely used in Functional electroplating such as decorative electroplating electronic devices, due to the rapid development of electronic technology in recent years, has led to rapid growth of functional silver plating. However, highly toxic cyanide silver plating is still the mainstream of silver plating industry at home and abroad. With the continuous improvement of environmental awareness, it is urgent to develop a mature cyanide-free silver plating process to replace the heavily polluting cyanide silver plating. [0003] At...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic cyanide-free brighteners have defects such as slightly low stability of the plating solution, too brittle coating, poor anti-discoloration ability of the coating, and unsatisfactory brightening effect.

[0004] The invention provides a cyanide-free bright silver plating solution, the mainstream of which belongs to the alkyl sulfonate plating solution, which solves and overcomes the problems of environmental pollution in the fluoroborate plating solution and the citrate plating solution. The composition is complex, the production is difficult to control, the long-term stability of the sulfamate plating solution is poor, and the disadvantages of lead sulfate precipitation are easy to occur