Question

Can Aluminium Be Rusted?

Answer 1

“Rust” results from the oxidization of iron$\left(\mathrm{Fe}\right)$. Aluminium$\left(\mathrm{Al}\right)$, technically, cannot rust. But aluminium$\left(\mathrm{Al}\right)$ forms aluminium oxide$\left({\mathrm{Al}}_2{\mathrm{O}}_3\right)$, in a chemical process like the creation of iron oxides$\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$.

Aluminium$\left(\mathrm{Al}\right)$ has a reaction affinity to oxygen$\left(\mathrm{O}\right)$. When a new aluminium$\left(\mathrm{Al}\right)$ surface is exposed to the presence of air, it quickly develops a thin, hard film of aluminium oxide$\left({\mathrm{Al}}_2{\mathrm{O}}_3\right)$. This aluminium oxide$\left({\mathrm{Al}}_2{\mathrm{O}}_3\right)$ makes aluminium$\left(\mathrm{Al}\right)$ corrosion-resistant that's why it cannot be rusted.