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Subject:	Re: Something oxidized on pin surface
From:	Wayne Thayer - EXT <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Wayne Thayer - EXT <[log in to unmask]>
Date:	Tue, 18 Oct 2016 14:50:51 +0000
Content-Type:	text/plain
Parts/Attachments:	text/plain (23 lines)

SEM pix have insufficient resolution to see what the peaks are.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Deng RongJun
Sent: Tuesday, October 18, 2016 4:31 AM
To: [log in to unmask]
Subject: [TN] Something oxidized on pin surface

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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