On Saturday, October 11, 2014 1:31:07 PM UTC-7, Dman777 wrote: > > After doing research, I see that > from: > http://www.fda.gov/ICECI/Inspections/InspectionGuides/InspectionTechnicalGuides/ucm072859.htm > >> The more active the flux the easier a solder connection can be made and >> the fewer rejects that occur. However, if not properly removed after >> soldering, active fluxes can lead to corrosion and electrical failures. >> > What is the best way to remove the flux? If it's a chemical, do I just > wipe down that one side of the pcb board that is flat and leave the other > side alone? > Thanks, > -Darin > Proof that a little knowledge is a dangerous thing. You should never need a "more active" flux when soldering electronics. You should only use a good rosin-core solder (Kester or Ersin, for example), which should work fine with new parts. When I have trouble wetting old parts from my junque box, I use a rubber eraser to remove the oxidation. The residual flux can be hygroscopic undeer very high humidity conditions, but I have never had this as a problem at under a few kilovolts; sometimes, I used IPA to remove the excess flux, but this was only for esthetics. If you screwed everything up by using an acidic flux, there will be unexpected leakage paths. Even if it kinda works initially, it is doomed to die a slow death due to corrosion. I do not know of any safe way to completely remove the residual acid.
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