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topic 54172

Trivalent silver plating




January 23, 2010

Q. Dear All,
Greetings, it would be a great help if anyone is able to clear my doubts; today I heard a requirement from one of my customer for trivalent silver plating. I have two types of silver plating with brightener and without brightener, even I searched in google for the same but I am not able to get it, please help me in knowing this new technology in our electroplating field!

Raja gopal
plating shop employee - India

January 26, 2010

A. Hi, Raja. I doubt that there is a trivalent silver plating process. But consider this: the world has largely moved away from hexavalent chromating of zinc and zinc alloy plating and towards RoHS-compatible trivalent chromating. Black chromates often have silver in them and I suspect that your customer is confusing this silver-bearing black chromate with silver plating.

Alternately, there are many ways to provide an anti-tarnish treatment to silver plating. One of the traditional ways was with a hexavalent chromate anti-tarnish treatment, which is probably not RoHS-compatible.

Please try to get a detailed report from your customer about what he is trying to say. Thanks.

Regards,

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


January 27, 2010

thumbs up signDear Ted,

Thanks for your information, I too suspect that my customer would have got confused with the trivalent chrome and silver,

regards

Raja Gopal
- India



Chrome-free low resistance anti-tarnish for silver

July 1, 2014

Q. Hi All,

I am looking for a low electrical resistance chrome-free anti-tarnish treatment for silver plate.

David Millward
- Montreal, Quebec, Canada


June 2014

A. Hi David. That one sounds easy because I can't think of any alternative to rhodium flashing/plating :-)

Regards,

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


July 1, 2014

thumbs up signHi Ted,
Thanks for the quick response although it is not what I wanted to hear. I thought I had read somewhere that a trivalent conversion coating for aluminum ( like Surtec 650 or similar) might give some measure of shelf protection on silver and possibly copper plating. Oh well, back to the drawing board.

David Millward [returning]
- Montreal, Quebec, Canada


June 2014

A. Hi. I too have heard vague rumors of the NAVAIR TCP coatings for aluminum being repurposed for use on other metals, so maybe they can "give some measure of shelf protection" to silver. Good luck.

Regards,

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


July 22, 2014

A. Hi David,

There's cadmium free, low electrical resistance post treatment chemical (so called pore blocker or anti-tarnish) available in the market to seal deposit porosity and form a hydrophobic film on silver to minimize moisture and/or sulfur containing environment attack to cause silver tarnish. The treatment is just a post immersion dipping after silver plating.

Regards,
David

David Shiu
David Shiu
- Singapore



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