Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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How to remove nitrates from silver cyanide plating bath
Q. Hello ,
I think nitrogen in our silver cyanide bath is a problem. I want to remove nitrogen compound as NO3 out of the bath . How I do that?
Any help please. Thank you very much. : )
Tawanlab s. - bangkok, Thailand
2004
A. The plating manuals I have read claim that nitrates up to 100 g/liter are not usually detrimental to silver plating. Therefore, one of the alternative methods I use for carbonate removal has been the use of Barium Nitrate to drop out Barium Carbonate, leaving Potassium Nitrate in solution. I have used Nitrate (sparingly) in bright silver (Cookson Silverex II) for several years to no ill effect. I mostly use Barium Hydroxide to drop carbonate but if the pH goes over 13.2 I also use BaN03.
Ron Graf- Claymont, DE, USA
May 26, 2009
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