采用高温高压釜模拟热力采油的蒸汽环境, 现场取材对N80和P110两种材质进行了腐蚀试验。采用扫描电子显微镜(SEM)和X射线衍射(XRD)等方法研究了腐蚀产物膜的形貌和化学成分, 并研究了高温高压混和蒸汽下的腐蚀机理。结果表明, 高温高压混合蒸汽对注汽管柱的腐蚀非常严重, O2、CO2均是重要的腐蚀因素; O2腐蚀产物晶粒细小, CO2腐蚀产物晶粒粗大; 150~250 ℃时, 随温度升高O2腐蚀速率呈下降趋势, 而CO2腐蚀速率变化不大; 250~300 ℃时, 随温度升高O2、CO2腐蚀速率均急剧增大。

The steam environment in thermal recovery was simulated using high temperature and high pressure autoclave, corrosion experiments of N80 steel and P110 steel which were taken from oil field were conducted. Then, the morphology and chemical composition of corrosion product film were studied by scanning electron microscopy (SEM) and X-Ray diffraction (XRD), and the corrosion mechanism in mixture high temperature and high pressure steam was studied. The results showed that the corrosion of mixture steam was serious, both O2 and CO2 were important corrosion factors. The grain size of corrosion products due to O2 was fine while the grain size of corrosion products due to CO2 was course. As temperature rose, the corrosion rate of O2 reduced, while the corrosion rate of CO2 changed little when the temperature rose from 150 ℃ to 250 ℃. With the temperature changed from 250 ℃ to 300 ℃, the corrosion rate of both O2 and CO2 were raised sharply.