The synergy between cementite spheroidization and Cu alloying on the corrosion resistance of ferrite-pearlite steel in acidic chloride solution  

作　　者：Hu Liu Jie Wei Junhua Dong Yangtao Zhou Yiqing Chen Yumin Wu Subedi Dhruba Babu Aniefiok Joseph Umoh Wei Ke 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [2]State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan,114009,China [3]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang,110016,China

出　　处：《Journal of Materials Science & Technology》2021年第25期65-75,共11页材料科学技术（英文版）

基　　金：financially supported by the Natural Science Foundation of Liaoning Province,China(No.2019JH3/30100037);National Natural Science Foundation of China(Nos.U1867216,51701222);State Key Laboratory of Metal Material for Marine Equipment and Application(No.SKLMEA-K201907)。

摘　　要：In this work,the corrosion behavior of medium-carbon steels(45,45 Cu and 45 Cuq steels)in acidic chloride environment was investigated.The results indicated that the micro-galvanic effect between the anodic ferrite matrix phase and the cathodic cementite secondary phase notably affected the corrosion resistance of the three steels.For 45 steel,serious pitting corrosion happened in and around the pearlite regions,and a large number of lamellar cementite was fixed in the corrosion pits.Meanwhile,the continuously increasing superficial area of cathodic cementite enhanced the micro-galvanic corrosion,resulting in a rapidly increase in corrosion rate with time.While for 45 Cu and 45 Cuq steels,macroscopic uniform corrosion occurred,and the cementite accumulation was markedly reduced as compared with 45 steel,thus the micro-galvanic effect was weakened and the corrosion rate was decreased accordingly.Among these,45 Cuq steel showed the most stable and excellent corrosion resistance during long-term corrosion,indicating the occurrence of a synergistic effect between cementite spheroidization and Cu alloying,thereby significantly improving the corrosion resistance of 45 steel.

关 键 词：Cementite spheroidization Cu alloying Ferrite-pearlite steel Micro-galvanic effect 

分 类 号：TG142.1[一般工业技术—材料科学与工程]