Can Aluminium Be Rusted?
“Rust” results from the oxidization of iron. Aluminium, technically, cannot rust. But aluminium forms aluminium oxide, in a chemical process like the creation of iron oxides.
Aluminium has a reaction affinity to oxygen. When a new aluminium surface is exposed to the presence of air, it quickly develops a thin, hard film of aluminium oxide. This aluminium oxide makes aluminium corrosion-resistant that's why it cannot be rusted.