Due to the severe toxicity of cyanide, cyanide-free plating is being promoted in many regions. However, some electroplating processes continue to use cyanide plating because of the large difference in the effect of cyanide plating compared to the use of cyanide plating.
As we all know, the electroplating industry has been suffering from pollution for many years, which has become a lingering pain for electroplating companies. Cyanide is one of the most powerful and fastest-acting toxic drugs known. In many potent rodenticides, cyanide is contained; if a person ingests 50 mg, it can kill; if a large amount of the substance is ingested, the patient will immediately lose consciousness and die (stroke cyanide poisoning). Most toxicology textbooks have identified severe cyanide poisoning as "stunned, comatose, and dying within five minutes." Because this toxicity is rapid and fatal. **
Cyanide is widely used in industrial production, especially in the electroplating industry. Cyanide plays a complexing role in the electroplating process, mainly by complexing the metal ions of the plating solution (target metal ions), and the complex formed by cyanide and the target metal ions aggregates near the cathode to form a cathodic polarization effect. The higher the degree of cathodic polarization, the slower the plating, but the higher the plating quality. Conversely, the lower the degree of cathodic polarization, the faster the plating, but the poorer the plating quality, the more likely it is to have holes or roughness. The cyanide complexation makes the coating fine and smooth, and the quality of the finished product is high. Therefore, the use of cyanide in the electroplating process is very common.
Due to the severe toxicity of cyanide, cyanide-free plating is being promoted in many regions. However, some electroplating processes continue to use cyanide plating because of the large difference in the effect of cyanide plating compared to the use of cyanide plating.
Cyanide plating is not irreplaceable, and countries have introduced treatment plans and prescribed emission standards. The ultimate goal is to eliminate cyanide plating and replace this toxic process with other process technologies. The achievement of this goal is mainly due to advances in electroplating technology and investment in cyanide-free electroplating research. For example, the original galvanizing is mainly cyanide galvanizing, and it is high cyanide galvanizing. Because of its large amount and wide area, many merchants have increased their research investment. After two generations of efforts, now they are cyanide-free bright galvanized and Bright galvanizing of potassium chloride not only replaces cyanide galvanizing from the properties of plating and plating, but also its operation management is easier and easier than cyanide galvanizing, wastewater treatment is easy, and production cost is low. The serious cyanide pollution in electroplating production is more due to the poor management of the company in the process of using and handling cyanide. The smuggling in the electroplating industry still occurs from time to time. Foshan Renchang Chemical adheres to the concept of environmental protection and has independently developed non-cyanide alkaline copper plating additive and cyanide-free alkaline zinc plating additive.
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