<strong>Fe13Cr5Al4Mo</strong>合金在高温高压水环境中的腐蚀行为

doi:10.11900/0412.1961.2021.00574

金属学报

2022, Vol. 58

Issue (12): 1611-1622 DOI: 10.11900/0412.1961.2021.00574

研究论文

本期目录 | 过刊浏览

Fe13Cr5Al4Mo合金在高温高压水环境中的腐蚀行为

林晓冬¹, 马海滨²(

), 任啟森², 孙蓉蓉¹, 张文怀¹, 胡丽娟¹, 梁雪³, 李毅丰¹, 姚美意¹(

)

^1.上海大学材料研究所上海 200072
^2.中广核研究院有限公司核燃料与材料研究所深圳 518026
^3.上海大学微结构重点实验室上海 200444

Corrosion Behaviors of Fe13Cr5Al4Mo Alloy in High-Temperature High-Pressure Water Environments

LIN Xiaodong¹, MA Haibin²(

), REN Qisen², SUN Rongrong¹, ZHANG Wenhuai¹, HU Lijuan¹, LIANG Xue³, LI Yifeng¹, YAO Meiyi¹(

)

^1.Institute of Materials, Shanghai University, Shanghai 200072, China
^2.Nuclear Fuel and Materials Department, China Nuclear Power Technology Research Institute, Shenzhen 518026, China
^3.Laboratory for Microstructures, Shanghai University, Shanghai 200444, China

引用本文:

林晓冬, 马海滨, 任啟森, 孙蓉蓉, 张文怀, 胡丽娟, 梁雪, 李毅丰, 姚美意. Fe13Cr5Al4Mo合金在高温高压水环境中的腐蚀行为[J]. 金属学报, 2022, 58(12): 1611-1622.
Xiaodong LIN, Haibin MA, Qisen REN, Rongrong SUN, Wenhuai ZHANG, Lijuan HU, Xue LIANG, Yifeng LI, Meiyi YAO. Corrosion Behaviors of Fe13Cr5Al4Mo Alloy in High-Temperature High-Pressure Water Environments[J]. Acta Metall Sin, 2022, 58(12): 1611-1622.

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摘要:

利用XRD、SEM和TEM等测试技术研究了Fe13Cr5Al4Mo合金在360℃、18.6 MPa去离子水和360℃、18.6 MPa、3.5 mg/L Li + 1000 mg/L B水溶液中的腐蚀行为。结果表明，Fe13Cr5Al4Mo合金的腐蚀增重远低于参比锆合金，且腐蚀增重速率较慢，表明Fe13Cr5Al4Mo合金的耐腐蚀性能优于参比锆合金。在2种水环境下，Fe13Cr5Al4Mo合金表面均形成了一层Fe(Cr, Al)₂O₄纳米尖晶石结构的氧化膜，在去离子水中还产生了Fe₃O₄外层氧化颗粒。Fe(Cr, Al)₂O₄尖晶石氧化膜整体上较为致密，可以阻碍氧离子和金属阳离子在氧化膜内的扩散，提高合金的耐腐蚀性能。此外，高温高压水中添加Li + B导致Fe13Cr5Al4Mo合金的腐蚀增重和氧化膜厚度发生变化，且抑制了外层氧化颗粒的产生，这与Li + B水溶液较高的pH值和Li⁺、B³⁺的相互作用有关。

关键词 ： FeCrAl合金, 高温高压水, 腐蚀, 氧化膜, 显微组织

Abstract：

FeCrAl alloys are promising candidate materials for accident-tolerant-fuel (ATF) claddings owing to their good high-temperature mechanical property, irradiation-swelling resistance, and high-temperature steam-oxidation performance. However, excellent corrosion resistance is also required in high-temperature high-pressure water environments when the alloys are used as ATF claddings. Therefore, in this work, the corrosion behavior of a Fe13Cr5Al4Mo alloy in 360^oC, 18.6 MPa deionized water and 360^oC, 18.6 MPa, 3.5 mg/L Li + 1000 mg/L B aqueous solution was studied. Results revealed that the weight gain and growth rate of the Fe13Cr5Al4Mo alloy were lower than that of the reference zirconium alloy, indicating a better corrosion property of the Fe13Cr5Al4Mo alloy. Moreover, an oxide film comprising Fe(Cr, Al)₂O₄ nanospinels formed on the Fe13Cr5Al4Mo alloy in both water environments, and Fe₃O₄ outer-oxide particles were observed in deionized water. The good corrosion performance of Fe13Cr5Al4Mo alloy was attributed to the compact spinel-oxide film, which could inhibit the diffusion of oxygen ions and metal cations. Adding Li + B into water changed the corrosion weight gain and oxide-film thickness of the Fe13Cr5Al4Mo alloy and impeded the formation of outer-oxide particles, which may be related to the high pH of alkaline Li + B aqueous solution and the interactions between Li⁺ and B³⁺.

Key words： FeCrAl alloy high-temperature high-pressure water corrosion oxide film microstructure

收稿日期: 2021-12-22

ZTFLH:

TG142.1

基金资助:国家自然科学基金项目(51871141)

作者简介: 林晓冬，男，1991年生，博士

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	林晓冬
	马海滨
	任啟森
	孙蓉蓉
	张文怀
	胡丽娟
	梁雪
	李毅丰
	姚美意
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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00574 或 https://www.ams.org.cn/CN/Y2022/V58/I12/1611

表1 Fe13Cr5Al4Mo合金的名义和实测成分 (mass fraction / %)

图1 Fe13Cr5Al4Mo合金管的基体显微组织

图2 Fe13Cr5Al4Mo合金中的第二相形貌、成分和SAED花样

图3 Fe13Cr5Al4Mo和Zr-4合金在去离子水和Li + B水溶液中的腐蚀增重曲线

图4 Fe13Cr5Al4Mo合金在去离子水和Li + B水溶液中腐蚀不同时间后的氧化膜表面形貌

图5 Fe13Cr5Al4Mo合金在去离子水和Li + B水溶液中腐蚀不同时间后的氧化膜截面形貌

表2 Fe13Cr5Al4Mo合金在360℃、18.6 MPa去离子水和360℃、18.6 MPa、3.5 mg/L Li + 1000 mg/L B水溶液中腐蚀不同时间的氧化膜厚度 (μm)

图6 Fe13Cr5Al4Mo合金在去离子水和Li + B水溶液中腐蚀不同时间后的XRD谱

图7 Fe13Cr5Al4Mo合金在去离子水中腐蚀100 d后氧化膜的截面显微组织、元素分布、SAED花样及快速Fourier变换(FFT)结果

图8 Fe13Cr5Al4Mo合金在去离子水中腐蚀250 d后氧化膜的截面显微组织、元素分布、SAED花样及FFT结果

图9 Fe13Cr5Al4Mo合金在Li + B水溶液中腐蚀100 d后氧化膜的截面显微组织、元素分布、SAED花样及FFT结果

图10 Fe13Cr5Al4Mo合金在Li + B水溶液中腐蚀250 d后氧化膜的截面显微组织、元素分布和SAED花样

图11 Fe13Cr5Al4Mo合金在高温高压水环境中的腐蚀过程示意图

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