One of our guys brought over a counterfeit parts manual
with a picture of some component leads exhibiting a rough orange-peel
texture.  The picture was presented as evidence of re-tinning, which
could indicate a counterfeit part.

The question is what could cause orange peel finish after
hot solder dip?  We perform a lot of hot solder dip, both in-house
and outside, and neither of us could remember the last time we saw
anything like this, though it does look kind of familiar.

In the picture, we could see no obvious patches of de-wetting or
non-wetting, just a uniform pebbly surface.  I don't think this would be
caused by a solderability problem, or rapid cooling, could it be too little
immersion time in the hot solder?  Could the solder in the pot be
contaminated with something like copper, gold, or iron?

-Joe


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