Chapter 17, Problem 44E

Aluminum $\left(E{°}_{{\text{Al}}^{3+}/\text{Al}}=-2.07\text{V}\right)$ is more easily oxidized than iron $\left(E{°}_{{\text{Fe}}^{3+}/\text{Fe}}=-2.07\text{V}\right)$, 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. Explain this observation.