Numerical exploration of a fully mechanistic mathematical model of aqueous CO2 corrosion in steel pipelines

A numerical exploration of a comprehensive mechanistic aqueous carbon dioxide (CO2) 2 ) corrosion model is conducted across a range of temperatures (273-313 K), CO2 2 partial pressures (0.1-1 bar), and bulk pHs (5-6.5). Contour plots are produced to examine the impact on corrosion rate, surface pH, and surface saturation index of iron carbonate (FeCO3). 3 ). Two response patterns are identified depending upon the limiting behaviour of the system, with a transition from charge-transfer control to mass-transport control as temperature is increased and partial pressure is reduced. FeCO3 3 surface saturation shows a strong correlation with the release of Fe2+ 2 + and increase in bulk pH.