Weighted Analysis of Corrosion-Inducing Impurities in Supercritical CO₂ Transportation System

The degradation of carbon steels in supercritical carbon dioxide is significantly influenced by impurities, yet a comprehensive understanding of the corrosion mechanism and unified industry standards remains lacking. In response to this challenge, an impact factor weight analysis of 27 published articles, comprising 149 observations, was performed to evaluate the response of the general corrosion rate of carbon steels to impurities such as oxygen, sulfur dioxide, hydrogen sulfide, and nitrogen oxides, as well as their mixtures. The findings indicate that the impurities have distinct effects on steel degradation in concentration- and exposure-time-dependent manners. Notably, sulfur dioxide and nitrogen oxides demonstrate a significant impact, oxygen plays a moderate role, while hydrogen sulfide exerts a profound influence on the corrosion rate of carbon steels. Hydrogen sulfide and oxygen exhibit a synergistic effect that accelerates degradation in supercritical carbon dioxide, whereas no pronounced synergistic effect is observed for sulfur dioxide and oxygen. This study provides a quantitative ranking of impurity impacts and demonstrates the impact level of the synergistic effects of oxygen, sulfur dioxide, and hydrogen sulfide, offering a scientific basis for developing pipeline integrity management strategies in supercritical carbon dioxide environments.