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May 2004

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Subject:
From:
Steve Gregory <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 5 May 2004 10:46:56 EDT
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Hi Charles!

Finally got your pictures up. Go to: http://www.stevezeva.homestead.com and
look at "Green Residue 1 and 2". Looking at the pictures, it sure looks like
something is reacting with the copper. Maybe some flux got accidently splashed
or spilled on the board after it was cleaned. How many assemblies exhibit this
problem?

-Steve Gregory-


> When we do the hand solder it takes about 1.5 hr. so we clean with IPA then
> wash with water. The flux core is alcohol based and cleans fairly well with
> IPA but we do hand clean after with saponifier and water. I did a little
> experiment with new copper. It looks like it might be the WS flux, but the
> parts that have the green are not hand soldered and the parts that are hand
> soldered do not have it.
>


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