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Cadmium cyanide plating aluminium and aluminium alloy pieces out of light appear

The reason:


(1) containing cyanide and hydroxide;


(2) have impurities or additives in the solution;


(3) carbonate accumulating too much;


(4) the solution of photoelectric liquid used for a long time.


Processing method:


1) supplement cyanide and hydroxide;


(2) add additives;


(3) adding barium cyanide or reduce the carbonate crystallization temperature, and then filtered to remove electrolyte;


(4) as the solution of photoelectric liquid used for a long time, is recommended to replace the solution of photoelectric liquid.