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  Thread 571/16

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
publicly reply to James Lee


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

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
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First of two simultaneous responses -- May 6, 2011
publicly reply to Robert H Probert


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
sara michaeli signature
Sara Michaeli
Tel-Aviv-Yafo, Israel
Second of two simultaneous responses -- May 8, 2011
publicly reply to Sara Michaeli



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