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Ted Mooney, P.E. RET
Pine Beach, NJ
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Carbonates in non-cyanide plating solutions
Does anyone know if carbonates will even form in non-cyanide neutral plating solutions?
Romina GarciaEngineer - Winnipeg, MB, Canada
September 17, 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 H Probert
Robert H Probert Technical Services
Garner, North Carolina
First of two simultaneous responses -- September 23, 2010
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
- Singapore
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