拉索钢丝电化学腐蚀进程的元胞自动机模拟方法

为了模拟拉索在实际环境中的腐蚀演化进程并探究氯离子在索体腐蚀过程中的催化作用，基于金属电化学腐蚀的基本原理建立了模拟拉索钢丝电化学腐蚀进程的元胞自动机模型，将腐蚀系统中的关键元素抽象成4种元胞类型，并将整个拉索腐蚀系统离散成500×500的元胞网格，通过定义的局部规则模拟钢丝在介观尺度上的腐蚀演化过程，分析了腐蚀性溶液浓度和腐蚀概率对钢丝腐蚀进程的影响，研究发现：当元胞自动机特征参数选取合理，并适当加大中心元胞与切线方向上的邻居元胞的接触概率，蚀坑形貌也就越接近真实形貌。元胞自动机模拟产生的蚀坑形貌与实际蚀坑形貌十分接近；钢丝腐蚀面积随时间不断变大的同时腐蚀速率也将逐步增快，表明一旦钢丝腐蚀出现蚀坑，钢丝腐蚀面积越来越大的同时其腐蚀速率也将越来越快；在拉索腐蚀的过程中具有氯离子的腐蚀性元胞具有主导地位，无氯离子的腐蚀元胞的腐蚀概率对钢丝腐蚀速率的影响不大，控制并减少周边环境中氯离子的浓度是减缓拉索腐蚀的有效途径。

Simulation of the evolution process of stayed cable electrochemical corrosion based on cellular automata

In order to simulate the corrosion evolution process of the cable in the actual environment and explore the influence of chloride ion on the corrosion process, a cellular automaton model for simulating the electrochemical corrosion process of the cable was established based on the basic principle of metal electrochemical corrosion. The entire cable corrosion system, the key elements of which were abstracted into four cell types, was discretized into a 500×500 cell grid, and its corrosion evolution process was simulated on the mesoscopic scale by the defined local rules. The effects of corrosive solution concentration and corrosion probability on the corrosion process of steel wire were analyzed. It has been found that if the characteristic parameters of cellular automata are selected reasonably, the morphology of the crater generated by cellular automata simulation is similar to actual etch pit morphology. It has also been discovered that the pitting area and corrosion rate of the steel wire increases gradually with time. The corrosive cell with chloride ions has a significant effect on the process of cable corrosion, but that without chloride ions has little effect on the corrosion rate of the wire, which indicates that reducing the concentration of chloride ions in the surrounding environment is an effective way to mitigate cable corrosion.