Solder mask peel from traces, post wave solder.

2017/2/2 4:28:45

Ok, I have an issue that is somewhat uniform in it's recurrence in that it keeps showing up on the same location on the board. The problem area is a group of traces on the exposed side, that keeps having solder mask peel occur. As you can see in the pictures, it would appear that there is some etchant residue underneath the solder mask.
My first notion would be to confirm (with you folks) if this is actually etchant residue or not, thusly bringing me closer to resolution. The second, should the first one fail, would be to ask if anyone has had any experience with something similar.
Some things to rule out: The wave solder fixture used to carry these boards is of no issue. It is made of composite material with no jagged surfaces or "heat-trapping pockets." The wave solder pot itself is within the allowable temp range.


2017/2/4 4:28:45

Appreciate your sharing.Please keep up your updates.


2017/2/4 4:28:45

I was really confused, and this answered all my qutoiesns.


2017/2/4 4:28:45


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