| 引用本文: | 焦拥军,李正阳,蒲曾坪,任全耀,郑美银,巫英伟,秋穗正.锆合金包壳在微动磨蚀环境下的界面损伤行为[J].中国表面工程,2022,35(4):41~49 |
| Jiao Yongjun,Li Zhengyang,Pu Zengping,Ren Quanyao,Zheng Meiyin,Wu Yingwei,Qiu Suizheng.Interface Damage Behavior of Zirconium Alloy Cladding Under Fretting Corrosion Environment[J].China Surface Engineering,2022,35(4):41~49 |
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| 摘要: |
| 锆合金燃料棒包壳在反应堆内会由于流致振动与定位格架发生微动磨蚀，现有研究并未考虑高温水环境下燃料棒包壳与格架之间的腐蚀加速磨损现象。通过微动磨损试验设备结合电化学工作站，研究不同外加电位(?0.8 V、?0.4 V、0 V、0.4 V 和 0.8 V)下锆合金包壳的微动磨蚀行为。采用 SEM、EDX、XPS、EPMA 和三维光学显微镜对磨痕表面的微观形貌和化学成分等进行分析，探究不同外加电位下锆合金的摩擦氧化行为及微动损伤机理。结果表明：随着电位的增加，微动过程中的腐蚀电流增加，加速磨损过程中锆合金的氧化腐蚀，锆合金的微动损伤加剧。不同外加电位下磨痕表面均存在明显的犁沟及氧化物颗粒堆积，主要磨损机制为磨粒磨损和氧化磨损。随着外加电位的增加，锆合金的磨损深度和磨损率增加，这是因为电位的增加使得腐蚀加剧，从而磨损与腐蚀交互作用增强导致磨损率的增加。揭示了电位对锆合金包壳磨痕形貌、磨损量和摩擦腐蚀交互作用的影响规律，阐明了不同电位条件下锆合金的磨损机制，为锆合金包壳在长周期服役过程中磨损行为的分析和预测提供理论支撑。 |
| 关键词: 锆合金 电位 微动磨蚀 磨损机制 |
| DOI：10.11933/j.issn.1007-9289.20220113001 |
| 分类号:TG178 |
| 基金项目:国家自然科学基金重点(U2067221)和四川省科技创新苗子工程项目(2021109)资助项目 |
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| Interface Damage Behavior of Zirconium Alloy Cladding Under Fretting Corrosion Environment |
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Jiao Yongjun1,2, Li Zhengyang2, Pu Zengping2, Ren Quanyao2, Zheng Meiyin2, Wu Yingwei1, Qiu Suizheng1
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1.State Key Laboratory of Multiphase Flow in Power Engineering, Xi’ an Jiaotong University, Xi’ an 710049 , China;2.Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213 , China
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| Abstract: |
| Fretting corrosion of zirconium (Zr) alloy fuel rod cladding with spacer grid will occur due to flow induced vibration in reactor. The corrosion accelerated wear between fuel rod cladding and spacer grid in high temperature water environment has not been considered in the existing research. The fretting corrosion behavior of Zr alloy cladding in different potential (–0.8 V, –0.4 V, 0 V, 0.4 V, and 0.8 V) is studied by fretting wear test equipment combined with electrochemical workstation. The SEM, EDS, XPS, EBSD, and 3D optical microscope are used to obtain the information of morphology and surface chemical composition. The friction oxidation behavior and fretting damage mechanism of Zr alloy under different applied potentials are studied. The results show that the corrosion current in the fretting process increases with the increase of potential, which accelerates the oxidation corrosion of Zr alloy in the wear process and aggravates the fretting damage. The obvious furrows and oxide particles accumulated on the surface of wear scar in different potential is observed. The main wear mechanism is abrasive wear and oxidation wear. The wear depth and wear rate of Zr alloy increase with the increase of potential, because the increase of potential would accelerate corrosion and improve the interaction between wear and corrosion, resulting in the wear rate increasing. The effect of potential on the wear morphology, wear volume, and interaction of wear and corrosion of Zr alloy is revealed. The wear mechanism of Zr alloy under different potential conditions is clarified, and this paper provides the theoretical support for the analysis and prediction of fretting corrosion behavior of Zr alloy in long-term operation condition. |
| Key words: zirconium alloy potential fretting corrosion wear mechanism |
