Distribution of Potential and Current in Circular Corrosion Cells Having Unequal Polarization Parameters

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Abstract
A mathematical model has been developed to describe the distribution of potential and current across concentric circular corrosion cells having unequal anodic and cathodic polarizabilities. This theory is essentially an extension of the Wagner‐Waber model to circular systems and is applicable to galvanic couples, metal matrix composites, and localized corrosion effects. The potential distribution in systems having unequal Wagner polarization parameters is not related in a simple way to the separate distribution curves for the two cases where the polarization parameters are equal. In thin‐layer electrolytes, there is a geometry effect in which the electrode polarization and current flow are concentrated near the anode/cathode juncture. The theory is applied satisfactorily to Pt/Fe model systems in dilute sodium chloride and to earlier results of Rosenfeld and Pavlutskaya with circular electrodes.

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