The transient crevice corrosion behavior of 304 stainless steel in NaCl solution has been investigated by a multiphysics coupling model. The model considers local electrochemical reactions, transport of different species, and homogeneous reactions. The moving mesh method is used to obtain the geometrical change of the crevice wall with time due to corrosion. The level set method is employed to quantitatively describe the influence of the precipitation process on electrochemical reactions. The transient crevice corrosion morphology, potential and current distributions, and pH and chloride ion concentration distributions are obtained by simulation. The effect of crevice geometry factors on the corrosion process is also discussed. The simulation results are in good agreement with the experiments, showing that the model has high reliability.

通过多物理场耦合模型研究了304不锈钢在NaCl溶液中的瞬时缝隙腐蚀行为。该模型考虑了局部电化学反应，不同物质的运输和均相反应。移动网格方法用于获得由于腐蚀导致的缝隙壁随时间的几何变化。水平集方法用于定量描述沉淀过程对电化学反应的影响。通过仿真获得了瞬时缝隙腐蚀形态，电势和电流分布以及pH和氯离子浓度分布。还讨论了缝隙几何因素对腐蚀过程的影响。仿真结果与实验结果吻合良好，表明该模型具有较高的可靠性。