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A phase-field model is developed to simulate the corrosion of Mg alloys inbody fluids. The model incorporates both Mg dissolution and the transport of Mgions in solution, naturally predicting the transition fromactivation-controlled to diffusion-controlled bio-corrosion. In addition touniform corrosion, the presented framework captures pitting corrosion andaccounts for the synergistic effect of aggressive environments and mechanicalloading in accelerating corrosion kinetics. The model applies to arbitrary 2Dand 3D geometries with no special treatment for the evolution of the corrosionfront, which is described using a diffuse interface approach. Experiments areconducted to validate the model and a good agreement is attained against invitro measurements on Mg wires. The potential of the model to capturemechano-chemical effects during corrosion is demonstrated in case studiesconsidering Mg wires in tension and bioabsorbable coronary Mg stents subjectedto mechanical loading. The proposed methodology can be used to assess the invitro and in vivo service life of Mg-based biomedical devices and optimize thedesign taking into account the effect of mechanical deformation on thecorrosion rate. The model has the potential to advocate further development ofMg alloys as a biodegradable implant material for biomedical applications.

Phase-field modeling of pitting and mechanically-assisted corrosion of Mg alloys for biomedical applications