论文部分内容阅读
采用接触角、pH值和粘度测量等方法研究了40%(质量分数)乙二醇对CO_2饱和的3.5%(质量分数)NaCl溶液及其凝结液性质的影响,采用失重、电化学和扫描电镜等方法研究了40%乙二醇对X65钢管道顶部气相和管道底部液相腐蚀行为的影响。结果表明:在常压、35℃条件下,40%乙二醇增加了CO_2饱和的3.5%NaCl溶液及凝结液与X65钢表面的接触角、pH值及粘度;在3.5%NaCl溶液和3.5%NaCl+40%乙二醇溶液中,管道顶部的凝结液pH值均明显低于管道底部溶液;40%乙二醇加速了液相腐蚀产物膜的形成,降低了X65钢管道底部的均匀腐蚀速率,促进了管道底部发生小孔腐蚀;乙二醇对X65钢管道顶部的均匀腐蚀速率未造成明显影响,但加速了小孔腐蚀的发生。
The effects of 40% (mass fraction) ethylene glycol on 3.5% (mass fraction) NaCl solution saturated with CO_2 and its condensate properties were investigated by means of contact angle, pH and viscosity measurement. The effects of weight loss, electrochemistry and scanning electron microscopy The effects of 40% ethylene glycol on the liquid phase corrosion at the top of the X65 steel pipe and the bottom of the pipe were investigated. The results showed that the contact angle, pH value and viscosity of 3.5% NaCl solution and 3.5% NaCl solution and 3.5% NaCl solution were increased by 40% ethylene glycol under atmospheric pressure and 35 ℃. In the solution of NaCl + 40% ethylene glycol, the pH value of the condensate at the top of the pipe was significantly lower than that at the bottom of the pipe. 40% ethylene glycol accelerated the formation of liquid corrosion product film and reduced the uniform corrosion rate at the bottom of X65 steel pipe , Which promoted the small hole corrosion at the bottom of the pipeline. Ethylene glycol did not affect the uniform corrosion rate of the top of X65 steel pipe obviously, but accelerated the occurrence of small hole corrosion.