Introduction to cyanide-free galvanizing process

- Oct 19, 2018 -

The processes for cyanide in electroplating are mainly galvanizing, copper plating, silver plating and alloy plating (such as brass, copper-tin alloy and imitation gold plating). Others are gold-plated, but the concentration of cyanide in other solutions is extremely low, and the amount of cyanide in the discharged wastewater is almost negligible through multiple recovery. In these plating solutions requiring sodium cyanide or potassium cyanide, the largest amount is cyanide zinc plating. According to the investigation, the sodium cyanide required for cyanide galvanizing accounts for about 70% of the total amount of sodium cyanide, that is, the amount is more than the sum of other plating materials (including the nickel plating layer). Times around. Technically, the cyanide galvanizing process is more likely to be cyanide-free than other plating.

As we all know, China's cyanide-free zinc plating technology has a solid foundation. The technical level of the two major cyanide-free galvanizing processes of chloride and zincate is not worse than that of foreign countries. As long as it is not nitpicking, it can be said that cyanide-free galvanizing is completely capable of replacing cyanide galvanizing. If there is a particularly demanding galvanized product, the Dacromet process can be used.

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