- Aug 18, 2018 -
As the anode protective coating for steel products, galvanizing is the most widely used plating in the world, and it is no exception in China. It accounts for about 1/3 of the total area of electroplated products. Because cyanide galvanizing has good dispersing ability, the coating is fine and the passivation performance after plating is good, and the coating is brittle, which is the mainstream process in galvanizing. In addition, the raw materials used are relatively cheap, and the area of steel products tends to be large. Therefore, the scale of the galvanizing tank is also large in electroplating. The tens of thousands of liters of plating liquid are common, and some such as locomotive vehicle factory electroplating train reefer exchange The galvanizing tank is up to 100,000 liters. These large galvanizing processes are precisely the choice of cyanide plating. Since galvanizing is a commonly used plating type, and the amount is also large,involving a wide range, it is important to promote cyanide-free galvanizing.
Cyanide-free galvanizing has matured in the cyanide-free electroplating movement in China in the 1970s, and it is now the most mature process in cyanide-free electroplating. The realization of cadmium-free cyanide will greatly reduce the amount of cyanide in the electroplating industry, while cyanide-free galvanizing has a good technical background. According to different needs and different technologies, cyanide-free galvanizing is divided into three series: alkaline and neutral (weakly acidic) and acidic. Among them, the performance of alkaline galvanizing and cyanide galvanizing is the closest, and the existing cyanide-containing galvanizing can pass the transition of low cyanide to cyanide, which is easy for manufacturers to accept.