Effect of Dissolved Oxygen on Long-term Corrosion of Domestic FeCrAl Based Alloys in High Temperature and High Pressure Waters

doi:10.11902/1005.4537.2024.318

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 1081-1088 DOI: 10.11902/1005.4537.2024.318

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Effect of Dissolved Oxygen on Long-term Corrosion of Domestic FeCrAl Based Alloys in High Temperature and High Pressure Waters

GAO Yunxia¹^,², HE Kun³(

), ZHANG Ruiqian³, LIANG Xue⁴, WANG Xianping⁵, FANG Qianfeng⁵

1 Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China
2 Hebei Key Laboratory of Physics and Energy Technology, North China Electric Power University, Baoding 071000, China
3 National Key Laboratory for Science and Technology on Reactor and Materials, Nuclear Power Institute of China, Chengdu 610041, China
4 Laboratory for Microstructures, ShangHai University, Shanghai 200444, China
5 Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

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GAO Yunxia, HE Kun, ZHANG Ruiqian, LIANG Xue, WANG Xianping, FANG Qianfeng. Effect of Dissolved Oxygen on Long-term Corrosion of Domestic FeCrAl Based Alloys in High Temperature and High Pressure Waters. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 1081-1088.

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Abstract

Ferritic Fe-Cr-Al based alloys have been considered as one of the most promising candidates as clad material for the accident tolerant fuel (ATF) owing to their excellent high temperature oxidation and corrosion resistance. The corrosion performance of Fe-Cr-Al alloys in highly oxidizing environments (such as high temperature, high pressure hydrothermal conditions) was very important to determine their suitability served as ATF cladding materials, especially for the domestic Fe-Cr-Al alloys. Herein, the corrosion behavior of domestic ferritic Fe-13Cr-4Al-2Mo-0.65Nb-0.4Ta-0.05Y alloy (mass fraction, %, designated as M2 hereafter) was examined via an autoclave at 360 ℃ in the condition of saturated vapor pressure with different dissolved-oxygen contents: namelytotal deoxidization (DEO), dissolved-oxygen concentration of 100 μg/L O₂ (DO100) and saturated dissolved-oxygen exposures (SDO) respectively for a long term. Then the formed oxide scales on M2 alloy were characterized by using XRD and SEM combined with EDS, and TEM in terms of their morphology and phase constituents, as well as elemental distribution and microstructure. The results indicated that the thickness of oxide scales on FeCrAl based alloy was 1.4, 2.3 and 0.1 μm in conditions DEO, DO100 and SDO, respectively. And with the increasing of dissolved oxygen contents, the phase constituent of the formed oxide scale changes from a mixed structure of spinel-like ((Fe, Cr)₃O₄), M₃O₄ and M₂O₃ in DEO conditions to the mixture of hematite-like (Fe, Cr)₃O₄ and (Fe, Cr)₂O₃ in DO100 conditions, and then a thin and dense monolayer structure of hematite (Fe, Cr)₂O₃ in SDO conditions. Correspondingly, the corrosion kinetics also changed from mass loss into mass gain. All the above results indicated that dissolved-oxygen had a significant influence on the corrosion of domestic FeCrAl based alloy in high temperature water, and it is worth noted that the domestic FeCrAl based alloy revealed an excellent corrosion resistance especially in SDO condition.

Key words: domestic FeCrAl based alloy long-term corrosion dissolved oxygen corrosion behavior duplex oxide films

Received: 29 September 2024 32134.14.1005.4537.2024.318

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(12275318)

Corresponding Authors: HE Kun, E-mail: kunhe14@163.com

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	GAO Yunxia
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	LIANG Xue
	WANG Xianping
	FANG Qianfeng

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.318 OR https://www.jcscp.org/EN/Y2025/V45/I4/1081

Fig.1 Mass changes of M2 alloy during immersion in the autoclave water environments with different contents of dissolved oxygen (a) and macroscopic features after 3000 h immersion test (b)

Fig.2 XRD patterns of M2 alloy after 3000 h immersion in high-temperature high-pressure water environments with different contents of dissolved oxygen

Fig.3 SEM micrographs of M2 alloy after immersion for 3000 h under the conditions of SDO (a), DEO (b) and DO100 (c)

Table 1 EDS analysis results of M2 alloy after 3000 h immersion under different conditions of dissolved oxygen

Fig.4 Bright field STEM cross-sectional images of M2 alloy after 3000 h immersion under the conditions of SDO (a), DEO (b) and DO100 (c)

Fig.5 EDS element mappings of the cross sections of oxide scales formed on M2 alloy after immersion under the conditions of SDO (a1, a2), DEO (b1, b2) and DO100 (c1, c2), and line scannings across the oxide scales

Fig.6 Electron diffraction patterns of the whole cross sections of oxide scales formed on M2 alloy after corrosion under the conditions of SDO (a) and DO100 (b)

Fig.7 Electron diffraction patterns of the outer layer (a) and inner layer (b) of the oxide scale formed on M2 alloy after corrosion under the DEO condition

Fig.8 Schematic of the duplex structure of oxide scales formed on stainless steels

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