Corrosion Behavior of Heat Resistant Alloys HR6W and 740H in High-Temperature Carbon Dioxide Environment

被引：1

作者：

Li Y. ^{[1
]}

Liang Z. ^{[1
]}

Deng S. ^{[1
]}

Gui Y. ^{[1
]}

Shao H. ^{[1
]}

Zhao Q. ^{[1
]}

机构：

[1] MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2020年 / 54卷 / 05期

关键词：

Carbon dioxide; Corrosion behavior; Heat-resistant alloy;

D O I：

10.7652/xjtuxb202005023

中图分类号：

学科分类号：

摘要：

The corrosion behaviors of heat-resistant alloys HR6W and 740H in carbon dioxide at 800, 900, 1 000℃ were investigated. The weight gain of the alloys was obtained by the analytical balance and the activation energy was evaluated. Raman spectrometer and X-ray diffraction were used to characterize the surface of the alloys. Scanning electron microscope and other equipment were used to observe the micro-surface morphology of the alloys. The results show that the corrosion kinetics of the alloys obeys a parabolic law. The activation energy of HR6W and 740H gets -256.59 kJ/mol and -293.35 kJ/mol, respectively. Dense oxide films of Cr2O3 and MnCr2O4 are formed on the surface of HR6W. In addition to the surface oxide films of TiO2 and Cr2O3, internal oxidation occurs on the surface of 740H. The outer layers consist of Cr2O3 and TiO2, the internal corrosion products are non-uniform Al2O3 and TiO2. In the high-temperature CO2 atmosphere, no carbonization is observed in the alloys. Analyzing the results of mass change and oxide layer thickness, it is found that the corrosion resistance of HR6W is better than that of 740H, which is attributed to the outward diffusion of Ti through Cr2O3 weakening the internal oxidation of Ti and Al. © 2020, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

引用

页码：179 / 188

页数：9

共 25 条

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