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Letter 11002
Alodine electrical conductivity
issue
I understand that Alodine is electrically conducted coating, which
does not affect grounding. Is it true?
Lev J. Balanovsky
- Feasterville, PA, USA
Yes, a thin coat to Mil-C-5541class 3 is often used in grounding
areas. See AMS-C-5541 [link is to spec at TechStreet] and
there are some numbers for this.

Martin Trigg
surface treatment shop - Stroud, Glos, England
Calling the chromate conversions "electrically conductive" is
really a misnomer. The Class 3 coatings are so thin that when put
under pressure, they short through and those shorts conduct, the
coating is not in itself conductive.
The variables involved are both the thickness of the coating, and
the surface finish of both mating surfaces. If you had a highly
polished pair of surfaces, it would be difficult at best to cause the
neseccary "punctures" through the surface thus allowing electrical
conductivity. Conversely, extremely rough finishes would allow
conductivity with very little pressure.
Bob Denney
avionics - Tampa, Florida
++++++
Hello,
I am trying to find value (number) for relative conductivity of
alodined aluminum.
Andrey Gleener
- Port Moody, BC, Canada
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