论文部分内容阅读
在模拟实际工况下,利用高温高压反应釜对X80管线的CO2腐蚀行为进行了研究,通过质量损失法、扫描电镜(SEM)和X射线衍射(XRD)等分析手段,研究了温度对X80管线钢腐蚀性能的影响。结果表明:随着温度的升高,实验钢的平均腐蚀速率和点蚀速率均是先增大后减小。在30℃时,试样表面未形成完整的腐蚀产物膜,此时环境温度较低,平均腐蚀速率和点蚀速率也最小;在60℃时,平均腐蚀速率达到最大值,此时腐蚀产物膜脱落严重,但点蚀现象并不明显;当温度到达90℃时,实验钢的点蚀速率达到最大值,并且点蚀速率与平均腐蚀速率相差程度最大;在120℃时,腐蚀产物膜与基体以及内外层之间的结合最为紧密,对基体的保护作用增强,所以此时的腐蚀速率比60、90℃的腐蚀速率均低。
Under simulated conditions, the CO2 corrosion behavior of X80 pipeline was investigated by high temperature and high pressure reactor. The effects of temperature on X80 pipeline were studied by means of mass loss, scanning electron microscopy (SEM) and X-ray diffraction (XRD) Effect of steel corrosion performance. The results show that with the increase of temperature, the average corrosion rate and pitting corrosion rate of experimental steel first increase and then decrease. At 30 ℃, the complete corrosion product film was not formed on the sample surface. At this time, the ambient temperature was lower and the average corrosion rate and pitting rate were also the smallest. At 60 ℃, the average corrosion rate reached the maximum. At this time, the corrosion product film But the phenomenon of pitting corrosion is not obvious. When the temperature reaches 90 ℃, the pitting corrosion rate of the experimental steel reaches the maximum, and the difference between the pitting corrosion rate and the average corrosion rate is the largest. At 120 ℃, And the combination between the inner and outer layers is the most compact, and the protective effect on the substrate is enhanced. Therefore, the corrosion rate at this time is lower than the corrosion rate at 60 and 90 ° C.