A thiosulfate silver plating additive, its preparation method and its electroplating solution

Abstract

The invention discloses a thiosulfate silvering additive, a preparation method thereof and electroplate liquid containing the same. The thiosulfate silvering additive comprises 12-18 g / L of lauryl sodium sulfate, 3-5 g / L of polyethylene glycol, 10-13 g / L of nitrogen mustard, 5-10 g / L of cumin, 250-350 g / L of 1,10-phenanthroline monohydrate, 50-100 g / L of dimercaprol dimercaptopropanol, 50-100 g / Lof mercaptoethylamine, 100-150 g / L of ethylene glycol tetraacetic acid (EGTA) and the balance water. The additive provided by the invention enables the dispersity, the stability and the electroplatingperformance of the electroplate liquid to be quite remarkably improved, the pH value does not need to be adjusted repeatedly in the electroplating process, meanwhile, the performance including the smoothness, the adhesive force, the glossiness, the anti-tarish performance and the like of a silvering coating are remarkably improved, the thickness of the coating is further reduced, and phenomena such as fracturing do not exist; and the electroplate liquid provided by the invention does not contain cyanide, the mirror surface of the coating is bright, small in brittleness, good in adhesive force, flat in surface, bright, good in anti-tarish performance and high in heat resistance, application to the multiple fields of decorative electroplating, functional electroplating and the like can be achieved, preplating is not needed, and the bonding force can also be guaranteed.

Description

technical field [0001] The invention relates to a thiosulfate silver plating additive, a preparation method thereof and an electroplating solution containing it, belonging to the field of silver plating. Background technique [0002] Silver has a unique silver-white luster, excellent electrical conductivity and brazing properties, relatively stable chemical properties to organic acids and alkalis, and the price is cheaper than other precious metals. Silver plating is widely used in tableware, jewelry, and artwork , electrical contact materials in the electrical and electronic industries, etc. [0003] So far, most of the electroplating silver processes at home and abroad still use cyanide silver plating. The reason is that the cyanide silver plating process has good stability of the plating solution, good plating ability and depth capability, and fine crystallization of the coating. However, cyanide is a highly toxic substance, which is harmful to the health of on-site oper...

AI Technical Summary

Problems solved by technology

However, cyanide is a highly toxic substance, which is harmful to the health of on-site operators. Good ventilation equipment is required during production, and the discharged sewage is not conducive to environmental protection.

[0004] With the development of industry, environmental pollution has become more and more serious, the awareness of environmental protection in various countries in the world has also been continuously strengthened, and the introduction of related policies has gradually eliminated cyanide-based silver plating. However, the existing cyanide-free silver plating has dull luster and Defects such as uneven layer, poor discoloration resistance, thick coating, poor adhesion, and easy cracking

Images