Carbonates in Cyanide Plating Baths

Question: What causes carbonates to form in a cyanide plating bath?


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Question:

What causes carbonates to form in a cyanide plating bath? L.R.

Answer:

There are three main mechanisms for forming carbonates in a cyanide plating bath. One mechanism is due to low or poor anode efficiency. In this case, the cyanide is oxidized to carbonate. Another mechanism involves the absorption of carbon dioxide from air in an alkaline solution. The third mechanism involves the decomposition of cyanide. All three mechanisms are usually at work in a cyanide plating bath. The bottom line is you will almost always have this problem!

 

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