From Lab to Model: Tackling Corrosion Challenges in Carbon Capture and Storage (CCS)

Abstract As Carbon Capture and Storage (CCS) expands to reduce emissions, corrosion (especially from acid dropout) becomes a key concern. Reactive impurities in CO2 streams, such as H2O, O2, H2S, SOx, and NOx, can form sulfuric and nitric acids. When these acids exceed their solubility limits, they condense into droplets and introduce additional corrosion mechanisms and threats. This paper presents a structured method for evaluating acid dropout corrosion risks and a model’s brick architecture. This corrosion model's goals are to: Outline the key steps in corrosion assessment Identify critical parameters influencing acid formation Estimate corrosion rates under varying CCS conditions Highlight knowledge gaps and areas for model improvement This paper also provides preliminary results of a parametric corrosion study, using weight loss measurements, to evaluate the corrosion behavior of synthetic acid phases under CO2 transport relevant conditions. Up to six different parameters have been tested on different materials. Results are analyzed using a three-tier classification system to rank the influence of each parameter on corrosion severity. The study underscores the need for further research in thermodynamics, reaction kinetics, droplet characterization, and flow dynamics, as well as the importance of robust corrosion data to enhance model accuracy and reduce conservatism.