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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 6 Nov 2003 10:17:24 +0200 |
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I would say that this is probably non-saponifiable residue. You would
probably understand the process better if you stopped calling your
cleaning solution 'soap'. It is not a soap but an alkaline solution
which reacts chemically with organic acids in the flux residues to
**form** a soap. To know what the non-saponifiable residues are, we
would need to know a lot more about your process, including the flux
type, soldering process, type of cleaning machine, water quality etc.
Brian
Bruce D Stilmack wrote:
> We are seeing a condition that has seemed to become a problem in our
> Manufacture of PCB's. We are seeing a film or slight amount of particulate
> matter on some of our solder joints. It gives a dull appearance that
> almost looks rough. The substance is dry, and can be brushed away with a
> dry medium coarse brush. It seems to only adhere to low areas ie the
> bottom of a fillet. If an excessive amount of solder is on the joint, the
> joint appears shiny and smooth. We use an Aqueous cleaner (Electrovert)
> and a Armakleen soap solution for cleaning. We change the soap once a week
> and we only do a moderate to small volume business. Anyone have any ideas?
>
> Bruce Stilmack
> GDLS-TO Manufacturing Engineer
> (850) 574-4773
> [log in to unmask]
>
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