By comparing standard reduction potentials, we can compare the reduction and oxidation powers of elements or ionic species. Some standard reduction potential values are given in Table 1.
The process of corrosion is a redox reaction. Consider the rusting of the body panel of automobiles. Certain parts of the object that are undergoing corrosion act as if they were half cells. For the corrosion of iron, iron is changed to Fe2+ ions. Which of the following best represents the area where this change occurs?