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Removal of carbonates in cadmium plating solution

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
4th Generation Surface Engineering
Consultant - Arvika,
Sweden
1999

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
2000

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