Me vs NiCad battery damage on PC boards

Sridhar Ayengar ploopster at gmail.com
Wed Feb 1 16:34:14 CST 2006


Chuck Guzis wrote:
>>Does one need to use a strong acid for this cleaning?  Can one use a 
>>concentrated weak acid instead?
> 
> 
> I'd much rather use a dilute strong acid (such as hydrochloric or
> phosphoric) than a concentrated weak acid, such as acetic.  A chem flush of
> a brass instrument typically uses hydrchloric diluted about 50:1.  Gets the
> calcium deposits and dissolves the oxide but doesn't etch the metal too
> much.  I've tried cleaning with acetic acid, but it's much slower.
> 
> As mentioned, sulfamic is another candidate--found in stuff like CLR
> (calcium lime rust) remover and Tarn-X silver cleaner (along with
> thiourea)--and may be worth a try if you're looking for a supermarket
> solution.

What about tetramethylammonium hydroxide?

Peace...  Sridhar



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