Simulation of Pitting Corrosion of Aircraft Surface Based on Cellular Automat

At the mesoscopic level, using the cellular automata method, the metal, metal passivation film and electrolyte were dispersed into an ordered cell grid in the cell space. The development process of pitting corrosion in three-dimensional space was simulated with different solution concentrations, dissolving probability and passivation probability, and compared with the experimental results. The results show that the pitting corrosion was deepened with the increase of time step. The higher the concentration of corrosion solution and the probability of metal dissolution, and the smaller the probability of metal cell passivation, the more serious the metal pitting corrosion. At the same time step, the number of corrosion damage was positively correlated with the length of the corrosion base point, and the number of corrosion damage decreased gradually in the order of double pits without corrosive medium exchange and space intersection, double pits with corrosive medium exchange and space intersection and single pit. Contrast depthes of pits about 1.5-2.5 were relatively stable under certain conditions.