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August 2007

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Subject:
From:
R Sedlak <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, R Sedlak <[log in to unmask]>
Date:
Mon, 13 Aug 2007 16:39:06 -0700
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Rob:

There are three possible causes of your foam problem.

First, we assume that fluxes cause foam when they dissolve into an aqueous cleaner... that is a good first assumption.
The cleaner is supposed to repress/kill the foam.. but, it needs to be warm enough to do that.. if you are not up to recommended temperature, that could be the problem...

Second, the defoaming capacity of any cleaner is finite, and if you are overloading with flux, you are overwhelming this capacity.   (Do you get foaming from the start, or only after cleaning for a long while?)

And, last, you simply may not have enough foam killing capacity in your cleaner.

The obvious, and probably likely least acceptable solution is to add defoamer..

Rudy Sedlak
RD Chemical Company

Rob Strecker <[log in to unmask]> wrote: All,

Has anyone else had foaming issues in an aqueous wash batch cleaner?
What are some of the causes of excess foaming?  We are applying our wave
flux via spray; however this flux is also suitable in foaming flux
applications.  We are currently in the process of optimizing our flux
application in the wave to significantly reduce the flux residue on the
boards.  This includes optimizing the sprayers, preheats and dwell time.
Initial tests show this is not having a major impact in reducing the
foaming.  We will be testing boards with only SMT flux residue, then
ones with only wave flux residue.  The theory is that by themselves they
do not foam but when mixed cause foaming.  We have recently changed
Paste suppliers, thus we now have two different manufactures of flux
mixing in the wash (one from SMT, one from wave).  Could this be a cause
of excessive foaming?

 

Thanks,

Rob Strecker


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