X80管线钢在高矿化度油田采出液中的腐蚀行为  

Corrosion Behavior of X80 Pipeline Steel in High-salinity Oilfield Fluids

作　　者：张骁勇[1] 张萌 王吉喆 ZHANG Xiaoyong;ZHANG Meng;WANG Jizhe(College of Material Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学材料科学与工程学院

出　　处：《腐蚀科学与防护技术》2019年第3期272-278,共7页Corrosion Science and Protection Technology

基　　金：国家自然科学基金(51174165);西安石油大学材料科学与工程省级一流学科项目~~

摘　　要：利用高温高压釜动态模拟实验,采用失重法研究了含水率和CO2分压对X80管线钢在油水混合物中腐蚀速率的影响;利用扫描电镜(SEM)、能谱(EDS)和X射线衍射技术(XRD)等技术手段表征腐蚀产物表面形貌、清理腐蚀产物后试样的表观特征和腐蚀产物成分。结果表明:随着含水率的增加,X80钢的腐蚀速率单调增加;X80钢的腐蚀速率随CO2分压的增加而增加,分压为1.5 MPa时,产物膜最致密;X80钢在油水混合物中的腐蚀产物主要由FeCO3构成;CO2分压一定时,总压的改变对X80钢的腐蚀程度影响较小。The corrosion tests of X80 steel were carried out in mixtures of oil and oil-field produced water via a high-temperature and high-pressure autoclave, while the effect of water content and CO2 partial pressure on the corrosion rate of X80 steel was studied by mass loss method. The steel after corrosion test was characterized by means of scanning electron microscopy(SEM), Energy Dispersive Spectrometer(EDS) and X-ray diffractormeter(XRD). The results indicated that the corrosion rate of X80 steel increased with the increasing water content. The corrosion rate of X80 steel increased with increasing CO2 partial pressure. Among others, the formed corrosion scale was the most compact when the CO2 partial pressure reached 1.5 MPa. The corrosion products were mainly composed of FeCO3. The total pressure had little effect on the corrosion of X80 steel when CO2 partial pressure was kept the same.

关 键 词：X80管线钢 原油含水率 CO2分压 腐蚀速率 腐蚀产物 

分 类 号：TG172[金属学及工艺—金属表面处理]