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December 2000

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 8 Dec 2000 14:25:04 +0200
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Phil

I recommend you work rapidly: every hour you wait will increase the
difficulties. By best guess is to soft-nylon-brush scrub with a
saponifier solution (mix to recommendations of manufacturer) at 50°C and
then immediately water clean as you would do the water-soluble flux
residues. This should get rid of all the stuff that is foreseeable from
your witches' brew. Yes, you will have some chlorides present, but the
saponifier plus wash should get rid of them but an ordinary ionic
contamination test should tell you whether there is a dangerous level
after cleaning.

Was your "maintenance person" nicknamed Dubya?

Brian

Phil Nutting wrote:
>
> OK.  We goofed.  Now I need to know how to fix all my problems.
>
> We are getting ready to convert from Alpha NR205 no clean flux to Alpha
> Lonco 373 aqueous clean flux in our wave solder machine.  Today my
> maintenance person mixed the two chemistries together in the machine. Yea, I
> shouldn't have put the new stuff anywhere near the old stuff.  Hind sight is
> always 20-20.  So here is the real problem.  About 20 or 30 through hole
> boards were run through the wave solder machine after the stuff was mixed
> together.  My initial (unpleasant) conversation with the flux vendor
> engineer suggested that there might be halides on these boards.  So we have
> segregated the boards until we can test or clean them.  Cleaning the machine
> should be no problem I'm told by the machine manufacturer's tech.
>
> How do I test for or remove halides from the circuit boards?
>
> Oh yea, these boards are hot for production naturally.
>
> Phil Nutting
> Manufacturing Engineer
> Kaiser Systems, Inc.
> High Voltage Power Supplies That Work(tm)
> 126 Sohier Road
> Beverly, MA 01915
> ph: 978-922-9300
> fx: 978-922-8374
> [log in to unmask]
>
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