dlj04(at)josephson.com
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 Posted: Sun Feb 16, 2014 11:15 am Post subject: AeroElectric-List Digest: 8 Msgs - 02/15/14 |
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On 2/15/14 11:58 PM, AeroElectric-List Digest Server wrote:
| Quote: | Question: If one were to use plumbers solder and plumbers flux on a
joint and thouroughly cleaned it with acetone or lacquor thinner,
would this be acceptable? I am just not aware of the chemistry
involved, or if anyone has done any experimentation with this process.
My sense is that the chemistry that promotes
corrosion in the "perfect joint" is all on
the outside and easily neutralized and/or
cleaned. The biggest risk to joint longevity
probably has more to do with alloy than with
removal of residual flux.
The problem is that people don't sufficiently neutralize and/or clean
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(how would they have known to test that they did?) and stray bits of
flux remain on surfaces that are not protected by solder. Acetone or
hydrocarbon solvents don't help, use water. Alkaline mineral water helps
get to the point where you can't detect any acid on the surface (battery
terminal cleaner spray with phenolphthalein indicator.) A failure mode
I've seen is on copper terminal lugs where the flux has penetrated into
small gaps between clamped surfaces and continues to attack the metal
from there, very similar to what happens when battery acid gets between
a terminal lug and the terminal. Rosin "electrical" flux is only really
active when it's hot; acid "plumbers" flux (primarily hydrochloric acid
or some metal chloride) continues to work when cold. The alloy doesn't
really matter, in my experience, so long as the joint cooled without
movement.
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