Morphology of Oxide Scale and Oxidation Kinetics of Low Carbon Steel  

作　　者：Guang-ming CAO Xiao-jiang LIU Bin SUN Zhen-yu LIU 

机构地区：[1]State Key Laboratory of Rolling and Automation,Northeastern University

出　　处：《Journal of Iron and Steel Research International》2014年第3期335-341,共7页

基　　金：Sponsored by National Natural Science Foundation of China(51204047);National Key Technology Research and Development Program in 12th Five-year Plan of China(2011BAE13B04);The Fundamental Research Funds for the Central Universities of China(N100307006)

摘　　要：The oxidation kinetics and composition of oxide scales on low carbon steel （SPHC） were studied during i- sothermal oxidation. Thermogravimetric analyzer （TGA） was used to simulate isothermal oxidation process of SPHC for 240 min under air condition, and the temperature range was from 500 to 900 ℃. Scanning electron microscope （SEM） was used to observe cross-sectional scale morphology and analyze composition distribution of oxide scales. The morphology of oxide scale was classical three-layer structure. Fe2 03 developed as whiskers at the outermost lay- er, and interlayer was perforated-plate Fe3 04 while innermost layer was pyramidal FeO. From the oxidation curves, the oxidation mass gain per unit area with time was of parabolic relation and oxidation rate slowed down. On the ba- sis of experimental data, the isothermal oxidation kinetics model was derived and oxidation activation energy of SPHC steel was 127. 416 kJ/mol calculated from kinetics data.The oxidation kinetics and composition of oxide scales on low carbon steel （SPHC） were studied during i- sothermal oxidation. Thermogravimetric analyzer （TGA） was used to simulate isothermal oxidation process of SPHC for 240 min under air condition, and the temperature range was from 500 to 900 ℃. Scanning electron microscope （SEM） was used to observe cross-sectional scale morphology and analyze composition distribution of oxide scales. The morphology of oxide scale was classical three-layer structure. Fe2 03 developed as whiskers at the outermost lay- er, and interlayer was perforated-plate Fe3 04 while innermost layer was pyramidal FeO. From the oxidation curves, the oxidation mass gain per unit area with time was of parabolic relation and oxidation rate slowed down. On the ba- sis of experimental data, the isothermal oxidation kinetics model was derived and oxidation activation energy of SPHC steel was 127. 416 kJ/mol calculated from kinetics data.

关 键 词：oxide scale~ morphology~ activation energy of oxidatiom＇ oxidation kinetics model~ low carbon steel 

分 类 号：TG142.31[一般工业技术—材料科学与工程]