Modeling and experimental study of CO2 corrosion on carbon steel at elevated pressure and temperature

摘要: Abstract Corrosion of carbon steel in carbonic acid environment largely depends on surrounding conditions such as CO2 partial pressure, temperature, flow velocity, and water chemistry. This article presents results experimental theoretical investigations conducted corrosion (AISI C1045) brine (2% NaCl solution) saturated with mixed gas containing dioxide nitrogen. Experiments were carried out a 2-liter autoclave at 0.83 MPa varying temperature pressure. Linear polarization resistance (LPR) weight loss (WL) techniques utilized to measure rate. Test duration was 187 h. In the presence CO2, rate increased sharply first 10 h, followed by sharp reduction. Results show that is most dominant factor affecting corrosion. The maximum without observed 43 °C. addition study, new model has been developed predict corrosive function applicable for non-scale forming condition. It considers electrochemical reactions occur surface, mass transport, homogenous chemical reaction occurs bulk solution. uses an improved solubility concentration dissolved other species. Model predictions are validated using measurements. Predominantly, good agreement between measurements demonstrating validity assumptions made establishment model.