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| Corrosion Behavior of Heat-resistant Alloys in High Temperature CO2 Environment |
LIANG Zhiyuan1( ), XU Yiming1, WANG Shuo1,2, LI Yufeng1, ZHAO Qinxin1 |
1.MOE Key Laborary of Thermo-Fluid Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
2.Harbin Boiler Company Limited, Harbin 150046, China |
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Abstract Corrosion behavior of Sanicro 25 austenitic steel, HR230 and 740H Ni-based alloys in CO2 environment at 800, 900 and 1000 ℃ was studied by means of weight gain measurement, scanning electron microscope with energy dispersive X-ray spectroscopy and X-ray diffractometer. The results showed that the corrosion kinetic curves of the three alloys in the high-temperature CO2 environment conformed to the parabolic law. The reaction rates of the three alloys all increased with the temperature, and the thickness of surface corrosion products also increased with the temperature. The corrosion products generated on the surface of the three alloys were mainly Cr-rich oxides, which were caused by the high content of Cr. However,the structure of the surface corrosion products of Sanicro 25 steel and HR230 and 740H alloys was different. Sanicro 25 steel was a composite layer type, HR230 and 740H alloys was a single-layer type; both HR230 and 740H alloys had internal oxidation, and the high content of Al and Ti in 740H alloy made internal oxidation more serious, therewith degraded its corrosion resistance. According to the corrosion mass gain measurement results and the occurrence of internal oxidation phenomenon, the nickel-based alloy HR230 has superior corrosion resistance in high temperature CO2 environment.
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Received: 24 August 2021
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| Fund: National Natural Science Foundation of China(51806166);Outstanding Youth Fund of the Natural Science Foundation of Heilongjiang Province(YQ2020E032);China Postdoctoral Science Foundation(BX20190269);China Postdoctoral Science Foundation(2020M683474) |
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Corresponding Authors:
LIANG Zhiyuan
E-mail: liangzy@xjtu.edu.cn
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About author: LIANG Zhiyuan, E-mail: liangzy@xjtu.edu.cn
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