Me vs NiCad battery damage on PC boards
ploopster at gmail.com
Wed Feb 1 14:27:18 CST 2006
Chuck Guzis wrote:
> On 2/1/2006 at 1:56 PM Joe R. wrote:
>> 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
>>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.
> The brass instrument folks use muriatic (hydrochloric) acid or sulfamic
> acid for cleaning. Still as dangerous as sulfuric when it comes to getting
> it lodged in nooks and crannies (and if this is an old board, it can even
> get wicked under traces), but easier to get because they're not on the list
> of reagents that explosive or drug makers use. Another chemical that may
> work is thiourea.
Does one need to use a strong acid for this cleaning? Can one use a
concentrated weak acid instead?
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