He Xinqi, Xie Chao
Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China.
Materials (Basel). 2025 May 25;18(11):2482. doi: 10.3390/ma18112482.
In this study, the effect of plastic residual strain on the corrosion behavior of ZK60 magnesium alloy was systematically revealed using a research method combining experimental characterization and numerical simulation. Based on the multiphysical field coupling theory, a numerical model containing deformation field, corrosion phase field, and material transfer field was constructed, and the dynamic simulation of plastic residual strain-induced corrosion damage was successfully realized. Tafel polarization curves obtained from electrochemical tests were fitted to the key parameters of the secondary current distribution. The kinetic parameter controlling the corrosion rate in the phase-field model was innovatively determined by the inverse calibration method, and a quantitative relationship between the kinetics of electrochemical corrosion and the phase-field theory was established. The corrosion depth distribution of the pre-strained specimens is quantitatively characterized and the results are in agreement with the finite element simulation results. The coupled strain-corrosion analysis method proposed in this study provides a theoretical basis for the design and life prediction of corrosion resistance of components under complex stress states.
在本研究中，采用实验表征与数值模拟相结合的研究方法，系统地揭示了塑性残余应变对ZK60镁合金腐蚀行为的影响。基于多物理场耦合理论，构建了包含变形场、腐蚀相场和物质传递场的数值模型，成功实现了塑性残余应变诱发腐蚀损伤的动态模拟。将电化学测试得到的塔菲尔极化曲线拟合到二次电流分布的关键参数上。通过反校准方法创新性地确定了相场模型中控制腐蚀速率的动力学参数，建立了电化学腐蚀动力学与相场理论之间的定量关系。对预应变试样的腐蚀深度分布进行了定量表征，结果与有限元模拟结果一致。本研究提出的耦合应变-腐蚀分析方法为复杂应力状态下构件耐腐蚀设计和寿命预测提供了理论依据。
