Hello All,
I have got a problem that about pin insertion on PCB. It seems something oxidized on pin surface and will effect soldering at customer site, and this been found several month later after SMT assembly.
Pin base material is CuSn6, and plating is: 1-2um Ni under 3-5um Sn 100. What is problem on pin surface? Any one of you have experience on this case?
Pictures and SEM result:
https://goo.gl/photos/GkZGsjRCQj16BW5V8
Best regards
Deng