基于元胞自动机法的高温金属腐蚀行为模拟

Simulation of Metal Corrosion Layer Growth Behavior under High Temperature by Cellular Automaton Method

本文基于元胞自动机方法对镍-铬合金在高温的含硫腐蚀性气氛中的氧化腐蚀行为进行模拟。模型中的重要变量包括反应概率、反应时间以及腐蚀层厚度。模拟结果表明,元胞自动机方法可以模拟出金属在氧化-硫化复杂化学反应体系,腐蚀层厚度符合Wagner抛物线理论。另外,研究了不同参数对镍-铬二元合金腐蚀的影响,结果表明,相同反应概率下,Cr浓度升高,反应物厚度减小,体现了铬的腐蚀防护性。

The cellular automaton（CA） method is employed to estimate the Ni-Cr alloy oxidation/sulfidation layer growth behavior under high temperature in corrosion atmosphere containing oxygen and sulfur element.The parameters in this model include reaction probability,reaction time and corrosion layer thickness.The simulation result shows that the model has the ability to reflect the high temperature corrosion characteristic.The oxidation kinetics follows the Wagner parabolic theory.Additionally,the parametric research is conducted by varying parameters in the model.The result shows that the increase of Cr concentration in the metal substrate leads to thinner corrosion layer thickness,which is accordance with the anti-corrosion property of Cr element.