Compound cyanide-free gold plating solution and preparation method thereof

Abstract

The invention relates to the technical field of light industry and chemical materials, in particular to a compound cyanide-free gold plating solution and a preparation method thereof. The compound cyanide-free gold plating solution is characterized by being composed of cyanide-free gold salt, soft base type coordination agents, non-soft base type coordination agents, reducing agents, impurity shielding agents, additives, pH buffering agents and water, wherein the content of the cyanide-free gold salt is 0.8-6g / L, the content of the soft base type coordination agents is 8-50g / L, the content of the non-soft base type coordination agents is 3-20g / L, the content of the reducing agents is 1-10g / L, the content of the impurity shielding agents is 5-20g / L, the content of the additives is 1-10g / L and the content of the pH buffering agents is 10-40g / L. The compound cyanide-free gold plating solution is small in corrosion to nickel layers and has the advantages that the stability is good, the plating effect is good and the utilization rate of the gold salt is high. The preparation method has the advantages of being simple and low in production cost.

Description

technical field [0001] The invention relates to the technical field of light industry and chemical materials, in particular to a compound cyanide-free gold plating solution and a preparation method thereof. Background technique [0002] Gold has good physical properties and stable chemical properties, so it is widely used in many industrial fields such as high-end decoration, electronics, instrumentation, and aerospace. The traditional gold plating technology mainly adopts cyanide gold plating. Although the effect of cyanide gold plating is good, the negative impact is also great. It is well known that CN in cyanide - It is highly toxic, not only has hidden dangers to the human body, but also has a great pollution to the environment. In recent years, the country has introduced a series of environmental protection measures, and the application of cyanide-containing gold plating is strictly regulated. The need for technology is becoming more and more urgent. [0003] In ord...

AI Technical Summary

Problems solved by technology

Yet because the existence of the sulfur in gold sulfite can increase the corrosion of nickel greatly, can cause the problem that coating corrosion depth is too large, so the gold plating solution of gold sulfite in the prior art has the big defect to the corrosion of nickel layer, In addition, the gold plating solution of gold sulfite in the prior art also has problems such as instability, poor plating effect, and low gold salt utilization rate.

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