Abstract
A 2-D axisymmetric time-dependent model for the corrosion of copper under an Evans droplet was developed using the finite-element method. Some unique features of the model are inclusion of 6 heterogeneous and 15 homogeneous reactions, implicit calculation of nm-scale films, and treatment of the influence of films on surface concentrations and potentials. Cathodic and anodic regions are not pre-defined on the electrode surface but are determined by values of local concentrations and potentials. The model shows time-dependent radial distributions for current density and surface coverage of films. The present work describes the methodology for the development of this mechanistic model.
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