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topic 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, Pennsylvania, USA


Yes, a thin coat to Mil-C-5541class 3 is often used in grounding areas. See AMS C5541 [withdrawn / link is to spec at TechStreet] and there are some numbers for this.

Martin Trigg-Hogarth
Martin Trigg-Hogarth
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 necessary "punctures" through the surface thus allowing electrical conductivity. Conversely, extremely rough finishes would allow conductivity with very little pressure.

Bob Denney
avionics Tampa, Florida



I am trying to find value (number) for relative conductivity of Alodined aluminum.

Andrey Gleener
- Port Moody, BC, Canada

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