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Gold electroforming

I am a chemical engineer work in electroplating field .I want to do a gold electroforming bath in our jobshop. I am reading u.s.patent No.6423202 which uses sodium gold sulfite solution. Please what formula do you suggest and what the operation conditions .You must know that all our plating solutions prepared by me from individual chemicals.My best regards.

Aide Mohhy Enad
Chemical Engineer - Baghdad, Iraq
2007

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Hello, Aide. I'm not quite sure what you want. If you believe the patent claims, i.e., that this improved formulation delivers very important advantages, then you must try to license its use from the inventor. If you feel the claimed advantages are not worth licensing, then you can find formulations in any of the plating textbooks or in the expired patents referred to in this new patent.

Unfortunately, I think the odds are very slim that any other reader has licensed the formulation, tried it, found it to not be worth the cost, and will suggest that you stick to the generic formulas. Good luck.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

Try to find old P.Spiro's book on Electroforming. Hope it helps and good luck!

Goran Budija
- Cerovski vrh Croatia
2007

Apr 18'2007 DEAR Goran Budija About electroforming I read some books like: Modern Electroplating and Electroplating Engineering Handbook [on AbeBooks or eBay or Amazon] . In Iraq there is no new editions of books about electroforming as I think. But I need a formula that I can preparing from individual chemicals and work with out complex problems. Thank you .

Aide Mohhy Enad
- Baghdad, Iraq
2007

Industrial grade electroforming is very complex and specialized job and only proprietary solutions are really usable.Gold can be electroformed from any cyanide bath with more than 20 gm gold/1 lit electrolyte.Other simple solutions are old ferrocyanide(200 gm ferrocyanide,50 gold chloride,50 gm sodium carbonate / washing soda [affil links],70 °C,5A/dm2,1,2 v-according to Paweck and Wiener) and hydrochloric acid based electrolytes(25-40 gm gold chloride,20-50 ml hydrochloric acid, sodium chloride 10-30 gm, sulfuric acid 10-20 gm, water 1 lit,70C,8-10 A/dm2).Hope it helps(little bit) and good luck!

Goran Budija
- Zagreb,Croatia
2007