I believe that water-soluble flux does indeed need to be washed off to
prevent corrosion. That's what HP used (probably still uses) on
production PC boards.
However, RA (rosin activated) or RMA (rosin mildly-activated) fluxes
that are used in repair and rework (or homebrew projects) may be left in
place. They only need to be removed for cosmetic purposes. In fact,
attempting to remove the flux with alcohol or another solvent can
actually cause problems if the removal process is not complete.
Alan N1AL
On 1/2/2022 11:16 AM, Ray wrote:
I worked at a large Computer Company in Cupertino, and we used Water Soluble
Flux,
Then washed the Boards in a Dishwasher, with Water.
Open Air Drying to keep water from Wicking into any Parts.
Ray WA6VAB Engineering. K3
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