Relationship between microstructure and corrosion behavior of high-grade pipeline steel in a low-temperature environment  

作　　者：Jia-qiang Jing Jie Guo Ba Li Shu-jun Jia Yi Ren 

机构地区：[1]School of Oil and Gas Engineering,Southwest Petroleum University,Chengdu 610500,Sichuan,China [2]Department of Structural Steels,Central Iron and Steel Research Institute,Beijing 100081,China [3]State Key Laboratory of Metal Material for Marine Equipment and Application of Iron and Steel Research Institutes of Ansteel Group Corporation,Anshan 114009,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2021年第8期1037-1046,共10页

基　　金：supported by the National Key Research and Development Program of China(Grant No.2017YFB0304900);the National Natural Science Foundation of China(Grant No.51911530129).

摘　　要：The relationship between micro structure and corrosion behavior of high-grade pipeline steel under low-temperature conditions was comparatively investigated by the potentiodynamic polarization and electrochemical impedance spec-troscopy test combining with optical micrographs,scanning electron microscopy,transmission electron microscopy and electron back-scattered diffraction.The results showed that,compared with room and high temperature,low temperature could influence the corrosion behavior of high-grade pipeline steel,which means that the corrosion potential and current density decreased and the corrosion resistance increased significantly.Moreover,double layer structures of the interface became thicker and more compact.Under low-temperature environment,acicular ferrite had the martensite/austenite constituents with less amount and smaller size,a higher density of low angle grain boundaries and smaller effective grain sizes compared with granular bainite,which demonstrated higher corrosion resistance.

关 键 词：Low temperature High-grade pipeline steel Corrosion behavior Resistance Acicular ferrite Granular bainite Martensite/austenite constituent 

分 类 号：TG142.1[一般工业技术—材料科学与工程]