Dear Ahmad
For weathering resistance - 1.0 micron gold - electro plated should be good
enough. When placing in the soil avoid abrasion as there would be no
guarantee of how much gold is left.
Sputtering thickness for porosity free - needs to be established. You can
check at what thickness the part is immune from concentrated Nitric acid
attack for 30 secs.
Anil Kher

-----Original Message-----
From: Ahmad, Syed [mailto:[log in to unmask]] 
Sent: 13 June 2014 18:56
Subject: Re: Sputtered gold thickness for copper corrosion protection in
soil

Lifetime a year or less for now. No Ni as RF circuitry is involved. 

-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Thursday, June 12, 2014 8:18 PM
To: 'TechNet E-Mail Forum'; Ahmad, Syed
Subject: RE: [TN] Sputtered gold thickness for copper corrosion protection
in soil

Ahmad,
What is the lifetime of the product?  No nickel between the copper and the
gold?
Bev

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ahmad, Syed
Sent: Thursday, June 12, 2014 9:10 AM
To: [log in to unmask]
Subject: [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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