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January 2012

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Subject:
From:
Julie Silk <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Julie Silk <[log in to unmask]>
Date:
Mon, 9 Jan 2012 12:23:43 -0600
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To get back to the original question:

I am certain that the flux or poor cleaning is the cause of the failures.  Spot-cleaning does not provide adequate cleaning of water-soluble flux.  It likely spreads the ionics across the board and underneath components.  The recommended cleaning methods in the various replies of cleaning the entire board with DI water in a good cleaning system and strong removal of excess water is the best.  But even dunking in a bucket or rinsing in the bathroom sink would work better than spot-cleaning (not that I recommend either!!).  A product should never spot-clean water-soluble flux, and especially not for an aircraft application.  

The other question that must be answered is whether the component is pulling the ionics into the part.  If this is the case, then even cleaning will not help.  You will have to change to a different flux.

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