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Well there is an explanation for everything, not sure I am sharp enough to explain your experiment's results so far. But since you have a technical background, how do you observe corrosion inside an airtight alum container?



All 4 alum tanks I made with a real short filler neck
and gas caps(production stuff) and 2 have vents..
I just open the cap and look in with a flash light..
then change the fuel and put the cap back on.. pretty
simple... (to keep it air tight, fill it all the way up)



I would anodize the tank. It is cheap to get done & you have a few choices of what colors you can get done. All of the race/street fuel fittings we make at work for customers are anodized for this reason. Mainly the import guys that run E-85