We're talking with our customers about converting from
RMA to an ORH1 water soluble flux for wave soldering.  We've
completed qualification testing per J-STD-001, but they have
some questions.

We'll be cleaning with an in-line system right after wave.
Before conformal coat, we plan to clean 100% in a batch system
with 75% isopropanol and DI water.  Sump resistivity is
monitored, so we will be performing 100% ROSE test on each lot.

Customer wonders what happens if there is any WSF residue at
all left on the boards between the time they are cleaned with the
in-line and the final cleaning stage.  Allowing time for hand soldering
and Genrad test, this is usually a day or two, but in the extreme, it
could be weeks.

They have the impression that WSF residues are strongly
corrosive, and the boards could turn to mush.  We have a
board that was soldered in November and hasn't been cleaned,
and solder joints are still shiny.

Question is this - any known instances of corrosion happening
in an air-conditioned shop?

Joe Kane
BAE SYSTEMS Controls
Johnson City, NY

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