Hi Ed - if the root cause of the attack is the peelable mask, then you
should be able to reproduce the same issue on any ENIG board and not just
this specific lot/supplier. There are lots of possible root causes for what
you described - plating issues, cleaning issues, etc.

Dave Hillman
Rockwell Collins
[log in to unmask]

On Wed, Oct 7, 2015 at 3:46 PM, Ed Popielarski <[log in to unmask]>
wrote:

> Hi all,
>
> I Have a batch of boards showing what I believe to be black pad. This is
> surfacing at thru hole (solderability, some pads are turning orange). One
> person suggested the peelable solder mask contains ammonia and this is what
> is causing it. I disagree.
>
> Suggestions or comments?
>
> Ed Popielarski
> Engineering Manager
>
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