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From [log in to unmask] Tue Oct 15 15: |
12:33 1996 |
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Ed,
Look at your cleaning process, it looks like you have flux residue. Are you
cleaning with alcohol after reflow? If you are you will get a white residue
between the pad and the soldermask part of the PWA. Talk to your solder paste
manufacture and see what they recommend for a cleanning process.
Hector Valladares
Honeywell Space Systems Florida
813-539-3683
Email [log in to unmask]
_______________________________________________________________________________
From: Knowles, Ed on Tue, Oct 15, 1996 2:09 PM
Subject: SMT Solder Joint Film
To: Return requested) (Receipt notification requested
We are noticing a film on our SMT solder joints. It doesn't seem to
affect ionic cleanliness or conformal coating adherence, but can only
be removed mechanically with a brush or Q-tip. It has a slightly
yellowish color in most cases and appears powdery. Is this
contamination from the PWB pads or part leads floating to the top, or
a compound derived from the solder paste (63/37 RMA)? Any insight
into what this contamination is would be appreciated.
Thanks.
Ed Knowles
Lockheed Martin Astronautics
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