The corrosion degradation behavior. of metallic materials under the combined action of stray current and mechanical load is crucial for their durability. This study targets mild steel, a material commonly used in engineering. A theoretical model and corresponding numerical method are established to predict the evolution of corrosion behavior. in mild steel under the coupled action of elastoplastic deformation and stray current. The effects of stray current frequency (1-100Hz) and strain level (elastic strains of 0. 1% and 0. 2%, plastic strains of 1. 0% and 2. 0%) on the current response at the solid-liquid interface and the corrosion kinetics are systematically investigated. The results indicate that corrosion electrochemical reactions dominate under low-frequency stray current, whereas the charging/discharging process of the electric double layer progressively governs the interfacial response at high frequencies. Elastic deformation only slightly promotes corrosion, whereas plastic deformation significantly accelerates it due to the introduction of numerous defects. The peak corrosion current density increases by 15. 76% to 19. 99% during the plastic stage. This work provides a scientific basis for assessing, predicting, and protecting against corrosion fatigue of metallic materials and structures under extreme conditions.
