Cyanide-free sulfite gold plating solution and application thereof

Abstract

The invention relates to the field of gold plating, and discloses a cyanide-free sulfite gold plating solution and application thereof. The cyanide-free sulfite gold plating solution is prepared from gold sulfite, alkali metal sulfite, 3-nitrobenzenesulfonate, organic polyamine, organic phosphonate, polyhydric alcohol compounds, a macromolecular polymer containing imine and thiourea compounds. The cyanide-free sulfite gold plating solution contains a current efficiency stabilizer with the excellent property, the current efficiency stabilizer participates in the cathode reduction process in the gold plating process to inhibit side reactions from occurring, therefore, the current efficiency is improved, and the cyanide-free sulfite gold plating solution is obviously beneficial for improving the uniform plating capacity of the plating solution; in addition, a series of the problems that the gold plating amount cannot be accurately estimated, the plating solution dispersing capacity is relatively poor, and the current density is low due to the unstable current efficiency caused by the low current are solved.

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