循环水中不锈钢缝隙腐蚀数值模拟研究

Crevice Corrosion Numerical Simulation Study of Stainless Steel in the Circulating Water

采用Comsol有限元软件对316L不锈钢在循环水溶液中一维稳态缝隙腐蚀过程进行了数值计算与模拟。求解域求解的控制方程包含了电迁移、对流、扩散等过程,电极反应动力学采用的阳极塔菲尔关系式,计算了电势分布、氯离子浓度及p H分布。计算出的p H与氯离子浓度的分布规律与文献值趋势接近。本研究还模拟了本体溶液不同的初始p H值和氯离子浓度对缝隙内离子浓度与p H分布的影响。本模拟研究的结果为接下来缝隙内闭塞区的研究提供了依据。

The finite element software Comsol was used for the numerical calculation and simulation to 316 L stainless steel in aqueous solution of one-dimensional steady-state crevice corrosion process. The governing equation contained the domain to solve electric migration,convection and diffusion process of electrode reaction kinetics of anode tafel equation,to calculate the electric potential distribution,chlorine ion concentration and p H distribution. The p H and chlorine ion concentration distribution was calculated and trend was close to literature values. This study also simulates the bulk solution with different initial p H and chlorine ion concentration within the cracks on the distribution of the ion concentration and p H. The simulation results for the following research provided a basis in gap within the block.