Leland
I must endorse what the others say. There are indeed very few "no-clean"
fluxes (if any) that can be effectively cleaned with a straight
water-wash. There are some (but by no means all) which may be cleaned
using a saponifier wash, such as Vigon A-200, or some others with a
hydrocarbon wash, such as some of the Petroferm so-called "semi-aqueous"
(what a misnomer!) products, followed by a good water wash in both
cases. In all cases, you would need to qualify the process to find out
whether it was suitable for your flux: this would probably be one
helluva lot more work than qualifying a water-soluble flux and a
straight aqueous cleaning process. Furthermore, the latter will save you
kilobucks because you are using something designed for the job, with
minimal extra chemicals required, and which is cheaper to buy, easier to
solder with, easier to clean and so on and so on and so on......
Brian
Leland Woodall wrote:
>
> Folks,
>
> We've been asked to investigate the pros and cons of performing an aqueous
> wash of our no-clean assemblies prior to them receiving an acrylic conformal
> coating. Our management team wants the product to be absolutely free from
> any type of contamination.
>
> Has anyone had any experience with this? What are the possible advantages
> and some of the pitfalls we could anticipate?
>
> Are there any knowledge sources that you might be able to recommend?
>
> Any assistance would be sincerely appreciated.
>
> Regards,
>
> Leland Woodall
> Quality Coordinator
> Keihin Carolina System Technology, Inc.
> 4047 McNair Road
> Tarboro, NC 27886
>
> Phone: 252-212-1565, ext. 2865
>
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