Modeling of Crevice Solution Chemistry on the Initiation Stage of Crevice Corrosion in Fe-Cr Alloys

This study investigates the initiation stage of crevice corrosion in Fe-Cr alloys by developing a theoretical model to evaluate transport processes and chemical reactions within crevices. The objectives include applying the model to both recent experimental data and simulated data while accounting for intricate electro-chemical interactions within crevice environments. Employing the finite element method, the model addresses the time evolution of solution chemistry, recognizing the influence of high current densities in Fe-Cr alloys, which leads to elevated ionic strength in the crevice solution. Results indicate a slight divergence between this model and the Sharland model; however, both sets of simulated results align reasonably with experimental observations. The flexibility of the model permits adaptations to various systems, offering insights into the mechanisms of crevice corrosion and establishing a scientific framework for future research and engineering applications.