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October 2016

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Subject:
Something oxidized on pin surface
From:
Deng RongJun <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Deng RongJun <[log in to unmask]>
Date:
Tue, 18 Oct 2016 11:31:26 +0000
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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

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