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Subject:	Re: Oxidized PCBs
From:	Brian Ellis <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:	Wed, 18 Oct 2006 16:51:48 +0300
Content-Type:	text/plain
Parts/Attachments:	text/plain (36 lines)

Use a water-soluble paste (with a good clean, of course).

Brian

Rich Wolbert wrote:
> OK, I know you guys are probably going to shake your head on this one, but
> I have to ask. We have a double sided fine pitch SMT assembly and we
> decided to go to white tin for the pad material. Here's where the problem
> comes in, we ran one side and when we started process the other side we
> found counterfeit chips. We stopped production for two weeks until the
> correct parts came in. When we tried to run the boards again, the PCB's
> oxidized so badly over the two weeks that we can not get the solder to
> wet. Any suggestions, other than scrapping the 170 assemblies at $600 a
> piece?
>
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