Mornin' Rich,

Just curious, what kind of flux are you using in your paste?

-Steve Gregory-

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rich Wolbert
Sent: Wednesday, October 18, 2006 8:32 AM
To: [log in to unmask]
Subject: [TN] Oxidized PCBs

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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