A couple of months ago I put some pieces of aluminum 2024-T4 and 6061-T6 in a bucket with water and a half kilo of marine salt. I left the bucket outside with temperatures between -3C° and +15C°.

This morning i checked the situation and this is the result. The aluminum was not primed.

Now I put that pieces back into the bucket. Let's check them next spring...

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Makes me feel confident in my decision to only prime the mating surfaces. Thx!

Interesting...I think it would be worth conducting the experiment with a couple pieces riveted together, then repeatedly taken in and out of the solution (one day in/one day out).  I think the corrosion is more likely to occur between the plates where electrolytic action takes place.  Removing in and out of the solution may aid the oxidation and better replicate what would happen with an aircraft out in the elements.  Could even do it with some plates primed/painted and others left bare.  All, the same, nice experiment worth considering..Thanks

Great test.    I can report that my aircraft has been living in Fiji for almost one year and absolutely no signs of corrosion on aluminum or chrome alloy steel tubing.     Although under shelter, very warm, humid and close to ocean (similar to florida but beer is cheaper).

The exterior is unpainted but the interior has two coats of zinc chromate and three where parts mate.   The chrome alloy steel parts were primed and painted.   Also dipped all rivets in zinc chromate during riveting process (yeah I guess a bit over kill but it is intended that the plane eventually will be operated as a sea plane).

Cheers Vic

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