论文和技术资料

A three-dimensional mathematical model under stationary conditions have been established to understand the corrosion of carbon steel cylindrical samples immersed in flowing NaCl solution through an annular duct. The migration, diffusion and convection mass transfer mechanisms were solved using the Nernst–Planck equation coupled to the Navier-Stokes equation. A corrosion model based on the mixed potential theory was used to provide kinetics parameters for oxygen reduction, water reduction and iron oxidation reactions. Evidence of the concentration profile of species at the metallic surface under stagnant and dynamic conditions is interpreted to explain various aspects of the corrosion behavior. The results demonstrate the important role of the fluid flow velocity. The results shows a good agreement with experimental results.