Measurements of the spontaneous dissolution rate of a pure iron rotating disc in oxygen saturated 0·5–11M H2SO4 solutions have been made at 25°C. In contrast to similar studies performed in deaerated solutions, it has been shown that oxygen considerably reduces the catalytic effect of a sulphate ion reduction product on the rate of iron corrosion by slowing the rate of hydrogen depolarisation. The presence of oxygen even causes a decrease in iron corrosion rate in more concentrated solutions of the acid and leads to local minima on the corrosion rate versus stirring rate curves.
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