A kind of cyanide-free sulfite gold plating solution and its application

Abstract

The invention relates to the field of gold plating, and discloses a cyanide-free sulfite gold plating solution and an application thereof. The cyanide-free sulfite gold plating solution contains gold sulfite, alkali metal sulfite, and 3-nitrobenzenesulfonic acid Salts, organic polyamines, organic phosphonates, polyol compounds, high molecular polymers containing imines, and thiourea compounds. The cyanide-free sulfite gold plating solution provided by the present invention contains a current efficiency stabilizer with excellent properties, which participates in the reduction process of the cathode during the gold plating process, and prevents the occurrence of chemical side reactions, thereby improving the current efficiency, which is obviously beneficial Improve the throwing ability of the plating solution. And it improves a series of problems such as the inaccurate prediction of the amount of gold plating caused by the low current and unstable current efficiency, the relatively poor dispersion ability of the plating solution and the low current density.

Description

technical field [0001] The invention relates to the field of gold plating, in particular to a cyanide-free sulfite gold plating solution and the application of the cyanide-free sulfite gold plating solution in preparing gold products. Background technique [0002] With the improvement of people's living standards, gold products are more and more favored by consumers. At present, more and more gold products are produced by electroplating. [0003] Although the cyanide-free sulfite gold plating technology has been available for more than 40 years, it is mainly limited by several factors such as technical difficulty, process cost and practicality, so it is rarely used in the current gold plating industry. But it is also the most researched technology in the development of gold plating technology at this stage, and it is a new technology that is most likely to replace the toxic and harmful cyanide gold plating technology. From the perspective of long-term development of the ind...

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Problems solved by technology

[0006] The purpose of the present invention is to promote and stabilize the current efficiency of cyanide-free sulfite gold plating solution (also referred to as cyanide-free gold plating solution herein), under the premise of not affecting the performance of the gold-plated layer, solve the problem that the gold-plated weight cannot be caused by low efficiency. Problems such as accurate prediction, relatively poor bath dispersibility and low current density