摘要
采用失重法、扫描电镜、能谱和X射线衍射等方法研究了X80管线钢和Q345B套筒钢在乌鲁木齐土壤模拟溶液中的腐蚀行为。结果表明:X80和Q345B钢在土壤模拟溶液中浸泡7 d的腐蚀均属于中度腐蚀。但在相同时间段内Q345B钢腐蚀得更严重。SEM图像和XRD谱结果表明X80钢的腐蚀产物分为两层,主要是Fe_2O_3和FeO(OH),说明土壤中的O_2对X80管线钢的腐蚀起主导作用;Q345B钢的腐蚀产物分为三层,主要是FeO(OH)、Fe_2O_3·H2O和FeS,说明土壤中的O_2和SO_4^(2-)对Q345B套筒钢的腐蚀起主导作用,而且两种钢材的腐蚀产物均疏松多孔,腐蚀性离子更容易到达基体表面,加速腐蚀。X80和Q345B钢的腐蚀机理都符合阳极溶解机制。
The corrosion behavior of X80 pipeline steel and Q345 B sleeve steel in simulated solution of Wulumuqi soil were investigated by mass loss method,scanning electron microscopy（ SEM）,energy dispersive spectrum（ EDS） and X-ray diffraction（ XRD）. The results show that the corrosion rate of X80 and Q345 B steel is moderate corrosion after immersed in the solution for 7 days,but the corrosion rate of Q345 B steel is corroded more serious. SEM imsge and XRD pattern show that the corrosion products of X80 steel divides into two layers of Fe2O3 and FeO（OH）,which shows that O2 in the soil plays a leading role in corrosion of X80 pipeline steel. The corrosion products of Q345 B steel divide into three layers of Fe O（ OH）,Fe2O3·H2O and Fe S,which shows that O2 and SO4^2- in the soil play a leading role in corrosion of Q345 B sleeve steel. The corrosion product of two steels is loose and purus,and the corrosive ions reach more easily the matrix surface and accelerated corrosion. The corrosion mechanism of X80 and Q345 B steel is in accordance with the anode dissolution mechanism.
作者
周会萍
罗立群
ZHOU Hui-ping;LUO Li-qun(China Petroleum Pipeline Co. , Ltd. , West Branch, Wulumuqi Xinjiang 830011, China;School of Materials Science and Engineering, Xi＇an Shiyou University, Xi＇an Shanxi 710065, China)
出处
《热处理技术与装备》
2018年第2期44-49,共6页
Heat Treatment Technology and Equipment
