Me vs NiCad battery damage on PC boards

Joe R. rigdonj at
Wed Feb 1 13:56:05 CST 2006

>On 2/1/2006 at 9:34 AM Tim  Shoppa wrote:
>>But is there some magic chemical or mechanical means that will render 
>>the existing cruddy PC board solderable so I can replace these flaky 

   I've seen the stuff you're talking about. Even after you clean off the
blue-green corrision the copper is black and solder won't stick to it. I
expect the black is due to copper oxide. You need to remove it by treating
it with some kind of acid that will form a water soluable salt with copper.
I expect dilute sulfuric acid may be the best. That's what they use to
clean copper circuit boards prior to assembly as well as  copper items
prior to electroplating, etc.  I'm sure you're aware of the dangers of
sulfuric acid and how much damage it can do to the board and components so
be careful!


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