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December 1999

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Subject:
From:
TOE /Torben Østeraa <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 8 Dec 1999 15:51:15 +0100
Content-Type:
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text/plain (38 lines)
Dear Technetters..
 
Although this subject has received much attention lately, 
nobody has mentioned the problem I find very strange:
 
Sometimes, the nickle thickness approaches zero along 
the edge of e.g. lager pads, wide tracks and solid copper 
planes. It is always the lower edge of the affected area.
I suspect some sort of hydraulic effect in the bath to 
cause it, but have never found the answer.
It mainly affects boards on some kind of Teflon material, 
although is as been observed on Polyimide and FR4 as well.
Plasma has been tried, hoping that altering the surface 
properties would make a difference. No effect found.
Chemistry is from Shipley/Ronal.
Hoping someone out there has a clue....
 
regards
 
Torben Østeraa
Printca AS
[log in to unmask] <mailto:[log in to unmask]> 
 

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