A peridynamic model for crevice corrosion damage

A new peridynamic (PD) model for crevice corrosion damage is introduced and cross-validated with experimental results from the literature. Electrochemical mechanisms are reduced to a simple metal -ion concentration-dependent corrosion rate. Computations over domains with extreme aspect ratios like those seen in crevices are efficiently performed by modifying the PD formulation to accommodate arbitrary-shape horizons. The model is validated against experimental results on bolted washers. Simu-lations predict both the location and the depth of deep corrosion trenches that form at a distance from the crevice mouth. Far-field boundary conditions are used to autonomously reproduce the experimentally observed progression of crevice corrosion. The PD model results also show that the two factors consid-ered here (diffusion-driven transport of dissolved metal ions, and dissolution being dependent on their concentration) are sufficient to predict the evolution of crevice corrosion. (c) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A new peridynamic model for crevice corrosion damage was introduced and validated with experimental results. The model simplifies electrochemical mechanisms and efficiently computes corrosion rates in domains with extreme aspect ratios. Far-field boundary conditions were used to predict the progression of corrosion, showing that two factors are sufficient to predict crevice corrosion evolution.