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Old September 29th 05, 05:51 PM
Asimov
 
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" bravely wrote to "All" (25 Sep 05 18:45:13)
--- on the heady topic of " Are these solder joints bad?"

st From: "
st Xref: core-easynews sci.electronics.repair:343123
[,,,]
st Rosin left on the circuit board will eventually corrode exposed metal,
st but it happens over a period of decades.
[,,,]

Acid flux will certainly corrode metal but rosin flux made for
electronics is pretty inert. I've seen older circuits with a lot of
residue rosin and they worked just fine.

The main problem I have experienced with rosin was in a high impedance
application because rosin will absorb and trap humidity thus lowering
circuit resistance. Perhaps this trapped humidity might explain the
corrosion you have seen on metal?

A*s*i*m*o*v

.... Who's got the Thermonuclear Welding Set? - ToddS