DoN. Nichols wrote:

That, and unlike anodize, it enhances electrical conductivity
instead of insulating against it. So -- it is used as a protective
finish in military aircraft (and simulators such as a previous employer
used to make) where it is necessary to get a good ground connection when
you attach parts together.

Don,

You are mistaken here. Alodine is an insulator. To get a good ground you
need to wirebrush it off (usually done with a wire brush in a drill with
a pin in the center to guide it). If you want to keep Alodine and not
scrape it off for bonding purposes, you must specify a "class 3" Alodine
finish- so thin that tightening a bolt will punch through the non
conductive conversion coating layer.
You can test this by taking a piece of alodined aluminum and placing a
smooth piece of metal on it (so as to not scrape the Alodine layer), and
measuring the resistance between them.

This is covered in section 6.1.2.1 of MIL-C-5541, which can be
downloaded he

http://www.assistdocs.com/search/sea...tus%5F all=ON


Kevin Gallimore


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