Abstract
Optical measurements of surface layers on passive iron electrodes are compared with electrical measurements of capacitance and other overpotential parameters. Results of these studies show that the surface layer on the electrode may be regarded as consisting of more than one part. Specifically, in neutral electrolyte there is a thin conducting layer of constant thickness present on the surface in addition to an electrically limiting layer of variable thickness, while in acid electrolyte there is a layer located outside the electrically limiting layer which grows at a constant rate to large thickness. This thick layer can be removed by holding the electrode at a potential slightly below the passive region. Changes in thickness of the electrically limiting layer, determined optically, are consistent with a field dependent conduction mechanism.
Published Version
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