Thanks
As you can see I a not a chemist.
I will order some 95% formic acid soon.
Glenn
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On 8/5/2018 3:52 PM, Sergey Kubushyn wrote:
On Sun, 5 Aug 2018, Glenn Little wrote:
I use acetic acid (vinegar) to clean alkaline battery residue and baking soda in solution to clean acid battery residue.
Formic acid is better than acetic -- it is more volatile than water or IPA
so whatever left after the cleaning will simply evaporates without a trace.
Don't use concentrated formic acid -- it has extremely strong odor (kinda
like acetic but many times stronger), it burns skin and will etch too much.
Dilute it with something like 5 parts of water.
As for baking soda for cleaning acid -- it is also not the best choice.
Ammonia is much better for the same reason as formic acid -- ammonium salts
are volatile unlike sodium. And excess ammonia will simply evaporate by
itself. Sodium sulfate, on the other hand, is difficult to remove completely
and it will keep etching your board. It is a very slow process but sooner or
later (couple of years) it WILL etch holes in copper traces.
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Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
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of the Amateur that holds the license"
