Answers below

Steven Hoffner wrote:
> All,
>
> I have a few questions regarding the cleaning of no clean fluxes.  First
> I know this is not recommended but I have a number of power supply
> assemblies (120/240V in, 3.3V out) that were poorly cleaned.
>
>
> 1.      Are the Sn and Pb salts left on the board conductive on their
> own in a low humidity (less than 50%) environment?
It depends (sorry, Paul)
> 2.      What level of Cl, Br, SO, NO, Weak Organic Acid contaminants if
> detected using Ion Chromatography would be low risk?
It depends
> 3.      What are some tests, that can quantify risk, that can be made on
> actual assemblies?
Plug 'em in under the worst climatic conditions and test for smoke
> 4.      What tests are best to screen any potential infant mortality
> failures?
Don't let the infants put their fingers in the power socket holes
> 5.      What are the best ways to clean the No clean flux residues from
> the assemblies?
Sorry, forget it. If they are newly soldered, there may be a chance but
your wording suggests that these are already existing devices (i.e.,
were soldered in the indeterminate past). As it is, you would probably
cause a lot more harm than good.

Brian
>
> TIA,
> Steven Hoffner
>
>
>
>
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