Before 1970 practically all bright zinc plating was cyanide based. Since that time, the development of non-cyanide alkaline and acid processes offers new options to the zinc plating industry. Today, the majority of zinc platers use cyanide free solutions. This elimination of cyanide is possibly the most successful achievement in the ongoing search of environmentally acceptable alternative technologies. In this paper the development of alternatives to cyanide zinc, from their inception to the present, is traced. The history of the evolution of alternative processes clarifies the general strategies required for the successful development of environmentally friendly technologies.
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