Activated solder flux residues left on a PCBA can cause severe corrosion problems. The leads on the component shown below are severely corroded.

pmic-corroded-1

The elemental spectrum suggests that the needle like corrosion product is lead chloride & lead bromide.

pmic-corroded-2

Conclusion – avoid inadequate cleaning of PCBAs.

pmic-corroded-3

Check out SEM Lab, Inc.  to learn more.

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