I concur. However, if you want something that looks cosmetically better,
you should ask your supplier to hard-anodise and seal the parts in
boiling water for 30 minutes. This will resist alkaline cleaners (pH
<12) much better than conversion coatings (and can be dyed in a very
wide range of beautiful colours, to boot!).

Brian

Stephen Gregory wrote:
> Hi All!
>
> We have a series of boards that we build here, that we've been building
> for years and years.
>
> These boards use a 320-pin right-angle male connector that has an aluminum
> chem-filmed body.
>
> After building the last batch of boards, we have 5-assemblies that have the
> worst looking chem-film coating on the connectors I have ever seen. Check out:
>
> http://stevezeva.homestead.com/files/Chem_Film_Gone_Bad.jpg
>
> I'm not a chem-film guru by any means, but I have a hard time believing that
> anything in my process caused this appearance. Chem-film conversion coatings
> are permanent aren't they? I mean the only way to remove them is mechanically,
> or etch them, right?
>
> These boards were wave soldered with a RMA flux and cleaned in Kyzen Aquanox
> 4512P.
>
> Anybody seen this before and know what might cause this?
>
>
> Stephen Gregory
> Senior Process Engineer
> LaBarge Incorporated
> Tulsa, OK 74146
> (918) 459-2285
> (918) 459-2350 FAX
> _______________________________________________________
> This message may contain information that is privileged and confidential to LaBarge, Inc. It is for use only by the individual or entity named above. If you are not the intended recipient, you may not copy, use or deliver this message to anyone. In such event, you should destroy the message and kindly notify the sender by reply e-mail.
>
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