HOME FAQs BOOKS JOBS: Help Wanted Suggestions you are here: Hotline/Forum => Letter 27119

I want to remove nitrates from silver cyanide bath

++++

Hello ,
I think nitrogen in our silver cyanide bath is a problem. I want remove nitrogen compound as NO3 out of the bath . How I do that?

Any help please. thank you very very much. : )

Tawan
lab s. - bangkok, Thailand

May 26, 2009

The plating manuals I have read claim that nitrates up to 100g/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 Hydoxide to drop carbonate but if the PH goes over 13.2 I also use BaN03.

Ron Graf
- Claymont, DE, USA

ANSWER or FOLLOW UP POST an unrelated QUESTION HOT Topics

Disclaimer: It is not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information
presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The
internet is largely anonymous; some names may be fictitious and some recommendations may be deliberately harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: