Steve,
We have seen exactly same, these are NAFI connectors with a thin
chromate over aluminium. An alkaline bath penetrated through the
improper finish and
Corroded the aluminium. 
Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Stephen Gregory
Skickat: den 14 december 2005 21:59
Till: [log in to unmask]
Ämne: [TN] Really Terrible Looking Chem Film...

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
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