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Hydrogen-induced pitting corrosion of metallic is a common phenomenon thatdamages the integrity and durability of the materials. Its numerical simulationis still a challenge due to many complex mechanisms, especially solid-solidphase transformation and mechanical interaction, leading to the anisotropicgrowth of hydride and inducing some bulges on the metal surface. In our work,we propose a phase-field model and numerical technique for simulation ofhydrogen-induced pitting corrosion, and apply it to the system of$\alpha$-Uranium. In our model, the elastic strain energy is introduced toapproximate the anisotropic pit morphology induced by the mechanicalinteraction between metal and hydride. For the numerical technique, the freeboundary condition based on the finite element method is adopted to introducethe bulges of the metal surface. By the application of our model and numericaltechnique, the anisotropic pit morphology with a bulge on the metal surface inagreement with experiments of $\alpha$-Uranium is obtained. Moreover, thecompression of $\alpha$-Uranium and the dilation of its hydride are discovered,which develops the deep understanding of hydrogen-induced pitting corrosion.This model is expected to be applied to the health detection ofhydrogen-induced pitting corrosion of metal in the industry.

A Phase-field model for simulating hydrogen-induced pitting corrosion with solid-solid phase transformation in the metal