Syed,

Your question makes me think of Direct Immersion Gold (used as a PWB finish), which I don't have any experience with, but which several people on TechNet seem to have had success with.

That's in the 2-4 microinches range, but part of its ability to protect the copper comes from the density of the deposit - I'm not sure how sputtering compares in that aspect. And storage on a shelf prior to soldering may differ a bit from 'storage' in soil.

Ben 

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From: TechNet [mailto:[log in to unmask]] On Behalf Of Ahmad, Syed
Sent: Thursday, June 12, 2014 9:10 AM
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Subject: EXTERNAL: [TN] Sputtered gold thickness for copper corrosion protection in soil

Any suggestion on how thick a sputtered layer of gold on copper terminal is necessary for corrosion protection? The gold sputtered copper terminals are to be in contact with soil and probed periodically.

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