Agree. I've used TOFSIMS sometimes for board evaluation. E.g. got
diagrams on following peaks for the solder pads of a ENIG board:
H, O, OH, F, C2H, CN, S, Cl, PO2, Br,PO3, SO4, Au, SiCH3, C2H3O, C3H7,
SiHO, Fe, Ni, Cu, C5H9, C5H5, C7H7,In, Sn, SnOH, Pb and some more. By
means of all this valuable information, we could decide what kind of
organic contaminations that disturbed the soldering of superBGAs.
TOFSIMS is expensive but worth every dollar when other methods don't
work.
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Noel Smith
Sent: den 21 februari 2008 23:56
To: [log in to unmask]
Subject: Re: [TN] Residues
Secondary Ion Mass Spectrometry (SIMS) and/or X-ray Photoelectron
Spectroscopy can almost certainly tell you the chemistry of a thin layer
such as the one you describe. Probably Time-of-Flight SIMS would be the
most sensitive and best able to give you a definitive answer.
You could try calling Evans Analytical Group (eaglabs.com) and discuss
with one of their TOF-SIMS analysts.
Noel
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of R Sedlak
Sent: Thursday, February 21, 2008 1:36 PM
To: [log in to unmask]
Subject: Re: [TN] Residues
Blair: My suspicion is that IC will tell you essentially nothing. From
the sound of your highly technical description, I would bet the residue
is largely organic, and most organics do not ionize, so IC would tell
you little.
It MIGHT be flux residue, what sort are they using?
Would recommend trying to dissolve the residue in a solvent, and send
out for GC-Mass spec.
Even an elemental analysis would give you a direction to move in.
Rudy Sedlak
RD Chemical Company
Blair Hogg <[log in to unmask]> wrote: We are having an issues with
printed circuit boards showing residues, that become more prevalent
after heating cycles. It leaves a shiny / oily looking film that is
somewhat splotchy. Sorry for all these technical terms.
I'm suspecting undercured epoxy, and I am currently looking to send some
out for chemical analysis. I have one lab quoting IC, and another's
website also recommends FT-IR. The supplier performed a ROSE test and
says there is no ionic contamination. The biggest problem we are having
is with conformal coating adherance. Due to certain components on the
one board that gives us trouble we aren't able to run it trhough our
aqueous wash cycle.
Is Ion Chromatography the right test? Any other suggestions?
Thanks,
Blair
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