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April 1998

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Subject:
From:
Lenny Kurup <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 17 Apr 1998 12:08:00 -0400
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TEXT/PLAIN
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TEXT/PLAIN (52 lines)
Hi Guitar,

I am not sure your black build-up is lead ,and if it is, then you need to
worry about the gold purity, and hence conductivity. Additionally, if your
gold is flaking, why are you concerned about solderability, you have bigger
problems. Good Immersion Gold processing will not produce the finish you
are being served.


Regards,
Lenny Kurup

On Fri, 17 Apr 1998, GuitarBud wrote:

> I recently received immersion gold finished boards from a PCB supplier where
> some of the edges of the traces were black.  The gold was flaking or had a
> bubbled appearance in areas as well.
>
> I was told that the black was lead build-up from the plating bath since extra
> lead was used to limit the reactivity of the bath.  I was also told that if we
> could live with the flaking, the lead build-up was not a reliability concern
> as long as we had good solderability.
>
> Is it likely that it is only lead and that reliability is not a problem?
>
> Frank
>
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