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Carbonates in non-cyanide plating solutions





September 17, 2010

Does anyone know if carbonates will even form in non-cyanide neutral plating solutions?

Romina Garcia
Engineer - Winnipeg, MB, Canada



First of two simultaneous responses -- September 23, 2010

I will not answer directly but to say that if you leave an open container of sodium hydroxide, or most any other sodium compound, it will take CO2 from the air and form sodium carbonate. This accelerates with heat. And we all have experienced carbonates increasing in a non-cyanide alkaline zinc plating solution with time and temperature.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
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Second of two simultaneous responses -- September 23, 2010

Hi Romina,

It's possible if the neutral plating solution is slightly alkaline with air agitation:

E.g. 2NaOH(aq.) + CO2(g) ==> Na2CO3(aq.) + H2O

Regards,
David

David Shiu
David Shiu
- Singapore


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