Why can we use or not use iron as aluminium foil?

Question

Why can we use or not use iron as aluminium foil?

Answer 1

We could use it...but that would be a rusty mess.

Iron oxidizes too quickly when exposed to water and air.

Answer 2

Because iron is not aluminum? And iron corrodes (rusts) too easily. Aluminum corrodes too, but its corrosion actually creates a protective barrier to prevent further corrosion.

Answer 3

Because aluminum foil is, guess what, aluminum foil. If we used iron, it would be iron foil. Which would rust quickly.