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Forwarded message:
Subj:    Re: FAB: Re: Pink ring and hard failures
Date:    97-07-19 15:50:27 EDT
From:    Rwmpc
To:      [log in to unmask]

OK Technetters - Here's another one to think about.  If you run boards
through the line and leave them in acid copper WITHOUT plating current, even
for the full duration of a typical plating cycle, you may see some attack
and/or what looks like pink ring formation.  Even the creation of a small
"wedge".  

Take another load of boards and run as you normally would, with current
applied by ramp-up, going in hot or whatever, and you'll see pink ring within
minutes.  Sort of leads you to believe that the oxide dissolution, while it
is chemical, is markedly accelerated by electrolysis.

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