Numerical simulation of carbon steel atmospheric corrosion under varying electrolyte-film thickness and corrosion product porosity

Abstract A finite element model is developed to study dynamics of atmospheric corrosion carbon steel, focusing on the influence thin electrolyte film thickness under varying product porosity. Calculations have been done evaluate impact and porosity oxygen diffusion path, hindrance effect products metal surface activity. The time evolution current density controlling steps in process are explored. When loose, dominant step, thicker film, lower rate. they dense, controlled by mixture discharge. path determined only porosity, therefore rate not affected thickness.