Relationship between microstructure and corrosion behavior of highgrade pipeline steel in a low-temperature environment
Jia-qiang Jing1, Jie Guo1, Ba Li2, Shu-jun Jia2, Yi Ren3
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
Abstract：The relationship between microstructure and corrosion behavior of high-grade pipeline steel under low-temperature conditions was comparatively investigated by the potentiodynamic polarization and electrochemical impedance spectroscopy 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.
Jia-qiang Jing,Jie Guo,Ba Li, et al. Relationship between microstructure and corrosion behavior of highgrade pipeline steel in a low-temperature environment[J]. Journal of Iron and Steel Research International, 2021, 28(8): 1037-1046.
2021, Vol. 28 
