A Finite Difference Numerical Analysis of Galvanic Corrosion for Semi‐Infinite Linear Coplanar Electrodes

Abstract

A finite difference numerical analysis technique has been used to evaluate the distribution of the electrode potential within the electrolyte above a galvanic corrosion couple with linear, semi‐infinite, coplanar electrodes. Corrosion reactions are assumed to be under activation control with logarithmic polarization behavior. The analysis accommodates any combination of electrochemical polarization parameters, corrosion current densities, solution conductivity, electrode dimensions, and depth of corrosion solution as variable parameters. Further, the analysis has been adapted to include the influence of an externally impressed polarization. The accuracy of the analysis procedure has been established by comparison with experimental results obtained from a model zinc‐copper galvanic corrosion couple. The effects of various parameters on the electrode potential distribution at the surface of the corrosion couple have been examined and their significance discussed.