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Green corrosion on silver plating

Hi, I make copper inductance coil out of of copper tubes by coiling them into a spring shape form and the tube ends are then soldered and sealed, thereafter silver plated per ASTM -B-700-97 class D semi-bright. Occasionally there are chemical attacks on the silver which form a layer of green color oxide which is only noticed after several days. How can we prevent this from happening?

James Lee
- Singapore
May 6, 2011

Copper and silver plated on each other or clamped together will migrate into each other, cuprous oxide is green.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

First of two simultaneous responses -- May 6, 2011

It is probably migration of the copper to the surface.
How many microns of silver do you plate?

Try a barrier layer of nickel between the copper and the silver.

Sara Michaeli
Tel-Aviv-Yafo, Israel
Second of two simultaneous responses -- May 8, 2011

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