Aran I know you are not that thick, I was making the point that Alu can corrode just like Iron or Steel, it's just given a different name in some compounds. Guys, yes the Al2O3 forms VERY fast, but the impurities in it, where the Aluminium reacts with the salt in the air, will mean that the Al2O3 will eventually transform into whatever the salt is, I don;t want to have to bring REDOX into it, but if I have to I will.