Modelling and Simulation of Pitting Corrosion
Bahaa R. Al-Shemmary, Falah Kaify Matloub, Hassan Al-Fetlawi
Department of Chemical Engineering, University of Babylon, Hilla, Babil, Iraq.
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Pitting corrosion is one of the most dangerous corrosion types that cause accelerated metal dissolution due to a breakdown of passive protective film on the metal surface. A mathematical simulation of pitting carbon steel corrosion in 1M sodium chloride solution was studied in this work. The commercial software (COMSOL Multiphysics 3.5a) was used to solve the equations that govern this problem. A two-dimensional model that allows the prediction of pit growth of the propagation stage was developed. The simulation model’s extracted results show how different parameters such as initial concentration of species, initial pH, different chemical and electrochemical reactions, and range of potential affect the current density and compare the result with the Pourbaix diagram of iron.