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topic 2144

Need 18K electroforming information.


(1998)

Q. Anyone have experience in 18K (Au/Cu/Cd) electroforming and can successfully control within the range of 75~76% Au content? Need information!

Best Regards.

Mark Cheng
- Hong Kong


A. Hi, Mark. Sorry, I don't know the answer, but I know who will. Technic has been offering gold electroforming processes around the globe for decades.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



How to replace cadmium in alkaline cyanide baths ternary alloys (Au-Cu-Cd)?

February 23, 2015

Q. Hello
I'm from Brazil and here we still use thick coatings of gold for decoration. For more than 15 years we successfully used a formulation, sold here, derived from a German industry (DEGUSSA) to cyanide alkaline baths for hard and thick layers in alloys 18k (Au-Cu-Cd). This alloy has 75% Au, 19% Cu and 6% in Cd. Thinking to meet the most demanding markets such as the US and the European bustamos a new formulation without cadmium. Because with the current formulation we cannot meet the laws of those countries.
So everything that ever expose above, I would ask if anyone knows any alkaline process, efficiency of quick deposit, which can be a bright layer, uniform, with gold alloy alloy (18k) for use in jewelry?
I know that ninety percent of companies use the lowest possible layer and protect cataphoretically with varnish. That is not our market. We want to find some way to continue with thick deposits, but without cadmium.

If someone can help, I thank you.

Paula Bardini
- Sao Paulo, Brazil



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