Work

Investigation of SO2-induced corrosion of X65 steel in gaseous, liquid, and supercritical CO2 environments through experimental and thermodynamic approaches

Year: 2025

Type: article

Abstract: Laboratory experiments and thermodynamic simulations were performed at 25 °C (8 MPa) and 35 °C (4, 8 MPa) to investigate the effects of SO 2 on the corrosion of X65 steel and water chemistry during liquid, gaseous, and supercritical CO 2 transportation. Results indicated that less than 100 ppm SO 2 significantly influenced corrosion processes. In the water-saturated CO 2 environment, higher SO 2 concentrations led to elevated general corrosion rates . Interestingly, in the CO 2 -saturated water environment, the general corrosion rate decreased at 35°C, 4 and 8 MPa, whereas it increased with rising SO 2 levels at 25°C, 8 MPa. SO 2 worsened water chemistry by reducing the contents of CO 3 2- and HCO 3 - , but enhancing the contents of H + , SO 3 2- and HSO 3 - in the CO 2 -saturated water phase at each CO 2 phase state. In the gaseous and supercritical CO 2 -saturated water environment, a thin or absent corrosion product was observed, with the adsorption of SO 2 and its derivatives being the dominant factor. In the liquid CO 2 -saturated water environment, the corrosion product competed with SO 2 , HSO 3 - , and SO 3 2- for adsorption sites, accelerating the corrosion rate.

Source: The Journal of Supercritical Fluids

DOI: 10.1016/j.supflu.2025.106574

Authors: Xiu Jiang, Xiaoliang Song, Chao Yu, Hui Xie, Dingrong Qu, Jing Hua

Institutions: Sinopec (China), SINOPEC Research Institute of Safety Engineering Co., Ltd.

Language: English

Topic: Corrosion Behavior and Inhibition

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Climate action

Open Access status: hybrid

Estimated APC paid: $3,910