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| Corrosion Performance of Transition Layer at Interface of Oxide Scale/substrate Formed on Austenitic Steel Fe32Mn7Cr3Al2Si During High Temperature Oxidation |
LIANG Taihe, ZHU Xuemei( ), ZHANG Zhenwei, WANG Xinjian, ZHANG Yansheng |
| School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China |
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Abstract The microstructure, composition and electrochemical corrosion properties of the oxidation-induced transition layer on austenitic steel Fe32Mn7Cr3Al2Si was investigated by means of XRD, EPMA, anode polarization and electrochemical impedance measurement, respectively. The Fe32Mn7Cr3Al2Si austenitic steel was intentionally oxidized at 700 and 800 ℃ in air, respectively, the formed oxide scale was typically composed of Mn2O3 outer sublayer, Mn2SiO4 middle sublayer, and Al2O3 inner sublayer. A transition layer of α-ferrite with Mn-depletion of 11% and Cr-enrichment of 14% at the interface of oxide scale/steel matrix was occurred at 800 ℃ in air for 160 h. Compared with the original Fe32Mn7Cr3Al2Si austenitic steel, the transition layer exhibited an increased passivation ability in 1 mol/L Na2SO4 solution, correspondingly, the free-corrosion potential increased from -463 mV (SCE) to 248 mV (SCE), the free corrosion current density decreased from the 2.8 μA/cm2 to 0.4 μA/cm2, and the resistant Rt increased from 15.5 kΩ·cm2 to 69.7 kΩ·cm2. It follows that Al- and Si-alloying can promote the Cr enrichment in the Mn depletion layer and therefore, improve the corrosion resistance of Fe32Mn7Cr3Al2Si austenitic steel.
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Received: 08 May 2021
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| Fund: National Natural Science Foundation of China(51575077) |
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Corresponding Authors:
ZHU Xuemei
E-mail: xmzhu@djtu.edu.cn
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About author: ZHU Xuemei, E-mail: xmzhu@djtu.edu.cn
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