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topic 3940

Removal of carbonates in cadmium plating solution


(1999)

We have high carbonates in our cyanide cadmium plating solution. For high carbonates in copper cyanide plating solution, the Metal Finishing Guidebook suggests precipitating them with lime (calcium hydroxide). Is this possible in a cadmium solution also, or do we have to freeze them out. If we do have to freeze them out, is dry ice a good method or will the carbon dioxide cause any problems.

Guy Lester
- Ontario, California


(1999)

Hi Guy. If you use NaCn you can freeze them out.

anders sundman
Anders Sundman
3rd Generation in Plating
Consultant - Arvika, Sweden



(2000)

Dear Guy,

To freeze out carbonates in cyanide -cadmium electrolyte is best method, but dry ice not suitable for that,because it can increase the amount of carbonates in electrolyte.

Best regards,Nina

N.Sezin
- Haifa,Israel



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