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Pretreatment of Tellurium copper before Silver Plating

Q. We have adhesion strength problems on Tellurium Copper parts after Silver Plating.
Of course, the parts are Pre silver plated. Brass Parts on the same rack are okay, the Tellurium Copper parts show blistering.
Which would be the correct Pretreatment before silver plating or pre silver plating?

Thanks a lot.

Wolf Werner
- Mexico City , MEXICO
2007

? Hello,

Is it possible to describe your pre-treatment before silver plating (conditions of degreasing, pickling, polishing base material before plating? etc).

Saludos,

Dominik Michalek
- Mexico City, Mexico
2007

? Your cleaning and etch cycles as well as the strike is critical and you have said nothing. Exactly, what are the conditions of your plating operation?

James Watts
- Navarre, Florida
2007

A. Tellurium CANNOT be electroplated onto from any cyanide solution. First strike it in any sloppy dirty copper sulphate [on eBay or Amazon]solution or any other ACID solution, then the silver cyanide strike will bond.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2007

A. If a nickel strike is allowed, that works; or plating right into a pyro copper bath first. The nickel seems to work better.

Dan Casey
- Everett, Massachusetts, USA
2007

Q. Silver plating on tellurium copper:
After silver plating, plating is get peel after 20-40 hours.

Ramsing S Rajput
mss - nashik, Maharastra, India.
July 15, 2015

? Hi Ramsing. Please don't make people pull your teeth before they can help you :-)

Are you doing the copper sulphate strike that Robert suggested, or the nickel strike or pyrophosphate copper that Dan suggested? Dominick and James requested a briefing on the cleaning and etching steps. Thanks.

Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
July 2015

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