State-of-the-art overview of pipeline steel corrosion in impure dense CO2 for CCS transportation: mechanisms and models

This work reviews the existing open literature concerned with pipeline steel corrosion in CO2-rich phase with impurities for carbon capture and storage purpose. The intent of this review was to provide information on the corrosion mechanisms, which is crucial for establishing the mechanistic prediction models. The primary focus was placed on key affecting parameters and their corresponding mechanisms, while the corrosion control strategies and research prospects are also discussed. This review covers the effects of: impurities, pressure, temperature, flow, exposure time, product layers, and steel chemistry. The influences of flow dynamics, amines, sulphur, and solids that had received little systematic attention need to be further addressed. Contradictory conclusions regarding the influence of H2O and O-2 on the corrosion rates should be re-evaluated. The localised corrosion and cathodic reaction mechanisms also require further investigation, especially under synergistic conditions with multiple impurities.