Abstract
The temperature dependece of anodic oxide growth on passive iron under steady-state galvonostatic conditions has been studied in the temperature range 14-60°C. The activation energy of the ionic conduction process in γ-Fe 2O 3 is 1·39 eV. The temperature dependence of the field coefficient is linear but shows an intercept at zero 1/T. The pre-exponential term is used to compute the mobile ion concentration, which is compared with values estimated from the crystal lattice data. The experimental value is practically equal to the cation vacancy concentration, but firm conclusions on the kind of activation control (internal or interfacial) are premature in view of the logarithmic accuracy.
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