[sdiy] Solder corrosion - what is it?
cjuried at yahoo.com
Fri Nov 4 18:27:00 CET 2016
Have you tried giving the pcb an ultra sonic bath?
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On Fri, Nov 4, 2016 at 6:39 AM, Steve Lenham<steve at bendentech.co.uk> wrote: On 04/11/2016 09:43, Paul Perry wrote:
> personally, i thnk that the grunge that develops gradually over years,
> is simply oxidation of the lead, accelerated by the presence of
> hygroscopic salts left after soldering.
> So my guess is basic lead carbonate.
> paul perry Melbourne Australia
Thanks for the responses so far. In my case, I am positive that it is
NOT flux residue - not only do I have a reasonable idea of what that
looks like but it is also evenly distributed over all tinned/soldered
surfaces including large areas of tinned PCB tracking some distance from
any joint. It also occurs on the legs of socketed ICs where no flux was
Neither water nor IPA dissolve the corrosion significantly. The only way
to get back to a shiny tinned surface is with slight abrasion e.g. a
fibreglass pencil, etc. I don't plan to do that on a widespread scale,
but I would like to lightly brush off as much as possible for cosmetic
reasons. Hence my concerns about what might be released into the air
when I do that.
All further input welcomed!
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