Abstract
A kinetic study was carried out of the ionic current in the anodic barrier oxide layer on iron at the steady state in the passive potential region in acidic phosphate solutions. It is found that the ionic current follows the classical high field ion conduction equation in which the current is expressed as an exponential function of the electric field in the barrier layer. From the kinetic constants appearing in this equation and their temperature dependence, the diffusion coefficient and the activation energy for diffusion of moving ions in the layer were estimated and compared with those of high temperature diffusion in iron oxides. It is suggested that the ionic current is carried by oxygen ions than by iron ions in the barrier oxide film.
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