Chapter 16, Problem 39E

Aluminum $({\text{E}}^{\text{o}}{{}_{\text{A1}}}^{\text{3}}{}_{\text{+/A1}}\text{= - 2}\text{.07 V)}$ is easily oxidized than iron $({\text{E}}^{\text{o}}{{}_{\text{Fe}}}^3{+}_{\text{Fe }=-}0.477\text{ V}),$ and yet when both are exposed to the environment, untreated aluminum has very good corrosion resistance while the corrosion resistance of untreated iron is poor. What might explain this observation?