Cyaniding silver plating brightening agent and preparation method thereof

Abstract

The invention relates to cyaniding silver plating brightening agent and a preparation method thereof. The brightening agent is characterized by mainly comprising antimony potassium tartrate, imidazole, sodium dodecyl dibenzene sulfonate, polyoxyethylene ether, deionized water and the like. The cyaniding silver plating brightening agent has a bright silver plating coating with uniform plating, fading prevention, high hardness, good wear resistance, and strong bonding force with substrate. Compared with a conventional cyaniding silver plating brightening agent, the operation of the brightening agent has the advantages of high working temperature, wide current density range, good deep plating capability and the like.

Description

technical field [0001] The invention relates to a brightener for cyanide silver plating and a preparation method thereof, belonging 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. Two categories of cyanide silver plating. With the continuous improvement of people's awareness of environmental protection, it is urgent to develop a mature cyanide-free silver plating process to replace the heavily polluting cyanide silver plating, which is the mainstream direction of future developmen...

AI Technical Summary

Problems solved by technology

However, compared with cyanide silver plating, the cyanide-free silver plating operation process is more complicated and the cost is higher, especially the stability of the plating solution and its brightener in the cyanide-free silver plating system has not been well solved, and it is difficult to Continuous operation for a long time, so the current highly toxic cyanide silver plating is still the mainstream of silver plating industry at home and abroad. This is one reason, and because the traditional bright silver preparation method is to plate Putting on a thick layer of silver and then polishing it by mechanical grinding not only wastes manpower and material resources, but also wastes a lot of silver in the polishing process, while the silver plating brightener can plate bright silver with a mirror luster at one time. Therefore, The research on brightener for cyanide silver plating has direct practical significance

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

[0004] The invention provides a cyanide silver-plating brightener and a preparation method thereof, which solves and overcomes the problem that most of the currently commercialized cyanide silver-plating brighteners contain sulfur, which is easily decomposed during the electrodeposition process, and the small molecules produced are vulcanized. The impurities will be mixed in the coating, which will easily change the color of the coating, and the working current density range during electroplating is narrow and the operating temperature is low.