【摘要】 井筒屏障金属材料腐蚀失效是影响碳封存安全性的关键问题。针对高温高压含杂CO₂封存环境下井筒套管腐蚀规律问题，利用高温高压反应釜模拟封存条件下的井下工况，分别研究了N80及13Cr钢在不同压力、应力条件下含杂质（SO₂、NO₂和O₂）的超临界CO₂富水相中的腐蚀规律。本研究利用失重法得到腐蚀速率，并利用扫描电镜（SEM）、X射线衍射仪（XRD）和X射线光电子能谱仪（XPS）等对产物膜进行了表征分析。结果表明，N80钢的均匀腐蚀与点蚀速率均随着压力的升高而增大；压力对13Cr钢的均匀腐蚀影响不明显，但在压力为20 MPa时出现严重的点蚀现象；给试样施加拉应力后，随着应力的增加，N80及13Cr钢的腐蚀产物层均出现了不同程度的破损，但是基体表面未观察到裂纹生成。更多还原

【Abstract】 Corrosion of metallic materials,used as wellbore wall is a critical issue that influences the safety of carbon sequestration.This work focuses on understanding the corrosion behavior of casing steels in high-temperature and high-pressure CO₂ storage environments.Herein,the corrosion behavior of two steels N80 and 13Cr in supercritical CO₂-rich water phases containing impurities （SO₂,NO₂,and O₂） was investigated via a high-temperature and high-pressure reactor by various pressure and stress conditions,aiming to simulate the real service conditions of carbon sequestration.The corrosion rate of steels was determined with mass-loss method,while the films formed on the steel surface were characterized by means of scanning electron microscopy （SEM）,X-ray diffractometry （XRD）,and X-ray photoelectron spectroscopy （XPS）.The results indicated that increasing the pressure led to higher rates of uniform corrosion and pitting corrosion for N80 steel.However,the pressure had inapparent effect on uniform corrosion of 13Cr steel,although severe pitting corrosion was observed by pressure of 20 MPa.Furthermore,the applied tensile stress could induce damage of the corrosion product scales on both N80 and13Cr steels to certain extent,nevertheless,no cracks were observed on the surface of the steel substrate.更多还原