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Sulfidation Corrosion Behavior of Nickel-based Alloys (Incoloy800, 825 and 625) in Sub/supercritical Water |
ZHANG Jie( ), QU Jiyu, LU Jinling, LIU Qian, LUO Xingqi |
State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China |
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Abstract The corrosion characteristics of nickel-based alloys (Incoloy800, 825 and 625) in sub/supercritical water systems with the presence of sulfides were investigated using supercritical batch reactor. The surface morphology, structure and phase composition of corrosion products were characterized. The difference in corrosion behavior for the three alloys were assessed in terms of the effect of temperature and elemental composition of alloys. It is found that the nickel-based alloy with lower Ni/Cr ratio had better corrosion resistance. For Incoloy800 alloy with Ni/Cr ratio of 1.5, the Ni and Cr mainly converted into dense spinel phase NiCrO4 which could protect the substrate from corrosion. With regarding to Incoloy825 and 625 alloys, whose Ni/Cr ratios respectively were 2 and 3, the corrosion scale of Incoloy825 alloy in supercritical water was 4.26 μm in thickness, while duplex scales with outer portion of metal sulfide and inner portion of metal oxides were formed for Inconel625 alloy. However, surplus Ni generated loose NiS phase, giving rise to significant corrosion for these two alloys.
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Received: 14 September 2020
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Fund: National Natural Science Foundation of China(22078260) |
Corresponding Authors:
ZHANG Jie
E-mail: jiezhang@xaut.edu.cn
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About author: ZHANG Jie, E-mail: jiezhang@xaut.edu.cn
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