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
• 来源期刊: 钢铁研究学报（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 1037-1046
• 页数: 10页
• 语种: 英文

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.