As a complexing agent for complex electroplating solution, cyanide is an important raw material for electroplating industry and is widely used in the world. However, cyanide is a highly toxic chemical with a lethal dose of only 5 mg. Once absorbed, it cannot be cured at all. With the change of China's industrial structure and the transfer of international processing industry, the dosage of cyanide electroplating in China is increasing. It poses a serious threat to the ecological environment of China. In addition, all aspects of cyanide production, transportation, storage and use must attach great importance to safety without any negligence. Therefore, the state strictly controls the sale and use of cyanide and stipulates a strict management system. Include limiting or even cancel that reverse cyanide electroplating process.
In fact, the research and development of cyanide-free electroplating has never stopped in the electroplating technology field all over the world. And with the progress of related technologies, new electroplating additives or intermediates that were not available before entered the electroplating market, which further improved the quality of the existing cyanide-free electroplating process, such as alkaline cyanide-free zinc plating, and made new progress in the original cyanide-free electroplating process, such as alkaline cyanide-free copper plating. The cyanide-free electroplating process of some plating seeds has been improved to varying degrees, but it can not completely replace the cyanide-containing process of these plating seeds. Therefore, people actively study cyanide-free gold plating process.