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topic 8395

Corrosion of Silver Plated Contacts


We have a small brass electrical component to be silver plated to about 1.5 microns. We have given an undercoat of copper to about 1 microns.

My question is these components in the field develop heavy corrosion products after about a month or so. On examination of these samples, the corrosion products are blue in color (copper sulphate?) How do we avoid this?

- Bangalore, Karnataka, India


Looks like you need at least a couple of microns of nickel layer between copper and silver to prevent copper diffusing into silver or vice versa.

Mandar Sunthankar
- Fort Collins, Colorado

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