材料期刊网

    用一个简单的元胞自动机从介观的角度对腐蚀环境中金属表面蚀坑的生长演化过程进行研究.假定腐蚀体系为扩散过程控制的金属腐蚀体系，引入溶液浓度、溶解概率和钝化概率，对腐蚀过程中质量转移、金属溶解和钝化过程进行分析；用模拟过程中的溶解掉的元胞数目表征溶解电流，用二维元胞自动机网格中纵向上溶解掉的元胞数目来表征蚀坑深度，研究了在不同的溶液浓度、溶解及钝化概率下溶解电流随时间的变化规律，其结果表明为服从时间的幂函数关系；并得到了蚀坑深度随时间的变化曲线.

    The evolution of corrosion pit growth on the surface of a metal in an aggressive medium is investigated with a simple cellular automaton model defined at a mesoscopic scale.A diffusion control of the electrolyte species is assumed,and for the elementary physicochemical process,such as mass transport,metal dissolution and passivation,some simple interaction rules are proposed and analyzed in regarding with the electrolyte concentration,dissolution probability and passivation probability.We assume that the number of dissolved metal sites represents the dissolution current,and the pit depth is represented by the number of dissolved metal sites at the longitudinal on the twodimensional square lattice.For the different dissolution probability and passivation probability,the laws of the dissolution current with time are investigated,which obey the time power function.Therewith the curve of pit depth for different time is obtained.