A Free Open Source Mechanistic Model for CO2/H2S Corrosion of Carbon Steel

An electrochemical model is developed to predict the corrosion caused by CO₂, H₂S, organic acids and/or O₂. The aim of this model was to provide the corrosion community with a theoretically sound, simple and effective corrosion model for internal corrosion of mild steel lines. This model is free of charge and can be accessed on the internet. All the background information, including theories behind, data used for calibration, limitations, etc. is shared with users. Additionally, the source code of the model, which has been written in object-oriented fashion, is open to public to encourage utilization of any individual modules and development of add-on modules by third parties.

The main features of this model include: prediction of uniform corrosion rate by CO₂, H₂S, organic acids and/or O₂, simulation of iron carbonate film and iron sulfide film growth, identification of major corrosive species by quantifying respective contributions from various species, capability of distinguishing CO₂/ H₂S dominant corrosion process, display and manipulation of polarization curves for CO₂ dominant process, or display of H₂S concentration profile as a function of distance from steel surface for H₂S dominant process, capability of interfering with corrosion calculation process by adding user-defined reactions or excluding any undesired reactions.