Al,
In my opinion, prevention is the ONLY cure! I believe that any
palliative removal of your residues will only cause much more harm than
good. If you have components that will not withstand water, there is
every chance they won't like any cleaning solvent, either. Even if you
find a compatible solvent, the best you can hope for, judging from your
description, is to spread your gudge in a thinner layer over a wider
surface area, so that it is less visible. However, no guarantee can be
offered about the reliability of the result. It will probably be better
to leave the boards, as is, warts and all.
It is never a very good idea to use one type of "no-clean" flux on top
of the residues of another: you have no control whatsoever of the
chemistry. At least, try the same flux for both operations.
Brian
Alan Kreplick wrote:
>
> Hello Technet,
>
> Looking for recommendations on how to remove the white residue left from a
> no-clean (Alpha 205R) rework process (mini-wave rework station) on a bunch
> of boards, both in-house and out in the field.
>
> The boards - single-sided pth - were wave soldered using Cobar no-clean
> flux. The boards have several aqueous incompatible components on them, so
> cleaning the already built boards in an in-line or batch di-water system
> with or without a saponifier is not an option (maybe a consideration for
> new boards if the aqueous compatible parts are put on after wave).
>
> Thanks in advance for the responses,
>
> Al Kreplick
> Sr. Mfg. Eng.
> Teraydne, Inc.
> 500 Riverpark Drive
> North Reading, MA 01864
> Tel: 978-370-1726
> Fax: 734-661-5352
>
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