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June 2007

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Subject:
From:
Greg Major <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 26 Jun 2007 10:41:42 +1200
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Hello TN,

When soldering to a ceramic board with silver tracks sintered to it, has 
anyone come across a requiremnt to use a higher silver content than SAC to 
prevent leaching of the silver?

I'd assumed that the (almost) 4% silver in SAC would have been more than 
enough to make the solder and substarte virtually electro-chemically equal and 
prevent leach/dissolution.

Pre pb-free, I remember reading about folks using 96S alloy (Tin & 3.7% Ag) to 
solder to such boards.

Given the liquidus point of 96S, I wouldn't have thought there would be much 
differnce with SAC.

Any ideas anyone?

cheers

Greg

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