Abstract
The cathodic reduction of passive film on iron has been investigated by the potentiodynamic and galvanostatic techniques in phosphate—borate buffer solutions of various pH values. The reduction was completed through two processes occurring at different potentials. One of them was the simultaneous reduction of ferric oxide to ferrous ion and metallic iron. This process consisted of a number of reaction steps, and the rate-determining step was the charge transfer reaction from FeOH 2+ to (FeOH) ads. As another process, it was unreasonable to consider the reduction of magnetite to iron which had been proposed previously; however, the reaction was possibly the reduction of Fe 2+ to Fe.
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