Question

why iron corrodes but alluminium does not ?

Answer 1

Iron and steel rust when they come into contact with water and oxygen. They rust faster in salty water or acid rain. Aluminium, on the other hand, does not corrode easily, because its surface is protected by a layer of aluminium oxide.

Answer 2

we know that aluminium is more reactive than iron.....but alluminium, zine,silicon ,beryllium are some elements which are called amphitoric elements.......which means that thry react with both acidic and basic medium but never corrode itself......

hope it helps u.....
also alluminium is used as useful foil for preservation of many foods........