Abstract
The electrode potential distribution across a galvanic corrosion couple with coplanar electrodes, one of which is infinitely large, is analysed theoretically. Corrosion reactions are assumed to be under activation control with logarithmic polarization behaviour. This analysis is applied to a model zinc-copper-zinc corrosion couple and compared with experimentally determined results. In addition it is used to predict the electrode potential distribution across the surface of an aluminium sample typical of that produced during scratching electrode experiments.