Influence of cementite spheroidization on relieving the micro-galvanic effect of ferrite-pearlite steel in acidic chloride environment

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

作者机构：Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China State Key Laboratory of Metal Material fo r Marine Equipment and ApplicationAnshan114009China School of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第61卷第2期

页      面：234-246页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

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

主　　题：Ferrite-pearlite steel Acidic chloride environment Granular cementite Micro-galvanic corrosion 

摘      要：The corrosion behavior of the as-received steel and the spheroidized steel in acidic chloride environment was investigated. The results indicate the corrosion mode and corrosion rate of two steels are diverse due to their difference in microstructure. For as-received steel with ferrite-pearlite microstructure, severe localized corrosion happens on the pearlite regions, and plenty of cathodic cementite remains in the pits, further strengthening the micro-galvanic effect and accelerating the corrosion rate. While for spheroidized steel with tempered martensite microstructure, the nanosized cementite particles evenly distributed on the ferrite substrate are easy to fall off, which can significantly reduce the cementite accumulation on the steel surface, relieving the acceleration effect of micro-galvanic corrosion.