Example:
“Just to
be clear, no-clean does not mean that it does not have to be cleaned. It simply
means that it leaves behind less residue than higher solids content fluxes. The
residue is most likely lightly corrosive. The white residue is most likely
unencapsulated metal salts. Conformal coating over the top of the residue is
not recommend.
The
potential for electro-migration is increased when flux (no-clean or otherwise)
is allowed to stay on the assembly. It only takes three key ingredients to grow
dendrites (metal crystals) on a board. These three ingredients are voltage,
conductive / corrosive material (flux) and moisture (humidity). The flux residue forms a conductive path connecting an
anode to a cathode. The results are either electrical leakage
(a temporary problem) or dendrite growth (a permanent problem).”
Source: Experts opinions: http://www.circuitnet.com/experts/56589.html
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