本文结合流体力学、电化学和材料科学的内容,考虑物质迁移、扩散、对流及反应动力学过程,以低合金钢在淡水介质中为背景,首次从理论上建立起描述扩展着的腐蚀疲劳裂纹内溶液的化学与电化学特征的二维数学模型。解该偏微分方程组,即可得到腐蚀疲劳裂纹内与裂纹尖端溶液的pH值、金属电极电位(指混合电位φ)以及溶液中其它 Based on the contents of fluid mechanics, electrochemistry and material science, considering the process of material migration, diffusion, convection and reaction kinetics, taking the low alloyed steel in freshwater medium as the background, the paper describes for the first time the theory of describing the corrosion fatigue crack Two Dimensional Mathematical Model of Chemical and Electrochemical Characteristics of Internal Solution. Solution of the partial differential equations can be obtained within the corrosion fatigue crack tip and crack solution pH, metal electrode potential (referring to the mixed potential φ) and the solution of other