A Mathematical Model for the Initial Corrosion Rate of a Porous Layer on a Rotating Disk Electrode

A mathematical model is presented for the initial corrosion rate of a porous layer on a rotating disk electrode. The model is used to predict he corrosion potential and corrosion current density for a porous electrode made of pure iron in aerated caustic solutions. The dependence of these predictions on some of the properties of the porous layer is presented. It is shown that the corrosion rate depends ignificantly on the specific surface area of the porous electrode. Conducting porous layers on electrodes are often used as electrocatalysts or supports for electrocatalysts. The corrosion of these layers can lead to the loss of the electrocatalyst; to study this, a steady-state mathemat-ical model for the initial corrosion rate of a conduct ing porous layer on a rotating disk electrode (RDE) has been developed and is reported here. Previous porous electrode models have been pre-sented and are reviewed by Newman and Tiedemann (1). Simplifying assumptions have been used in the develop