Corrosion behaviors of P110 and N80 tubular steels in CO₂ gas phase and supercritical (S-CO₂) phase in a saturated water vapor environment were explored in corrosion weight loss experiments by SEM, EDS, XRD, XPS and cross-section analysis techniques. With the increase in CO₂ partial pressure, the average corrosion rate increased first and then decreased. The average corrosion rate reached the maximum value under the near-critical pressure. When CO₂ partial pressure further increased to be above the critical pressure, the average corrosion rate gradually decreased and local aggregation of molecules was weakened.

中文翻译：

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CO 2气态-超临界相变对饱和蒸气环境下碳钢腐蚀行为的影响

通过SEM，EDS，XRD，XPS和截面分析技术，通过腐蚀失重实验，研究了P110和N80管形钢在CO ₂气相和超临界（S-CO ₂ ）相在饱和水蒸气环境中的腐蚀行为。随着CO ₂分压的增加，平均腐蚀速率先升高后降低。在近临界压力下，平均腐蚀速率达到最大值。当CO ₂分压进一步增加到临界压力以上时，平均腐蚀速率逐渐降低，分子的局部聚集减弱。