Tribolayer evolution and subsurface microstructural transformation in Cr-coated Zr alloy claddings under fretting corrosion in simulated PWR primary water

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-10-15 DOI:10.1016/j.corsci.2025.113419

Jie Yang , Ziye Dong , Yufan Jiang , Junqiang Lu , Yanguang Cui , Kun Zhang , Yahuan Zhao , Jiaqi Li , Chenyu Wang , Yiheng Wu , Yangxin Li , Kai Chen , Shixin Gao , Xiaoqing Zeng , Zhao Shen

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Abstract

The fretting corrosion of Cr-coated Zr alloy cladding in simulated pressurized water reactor (PWR) primary water (315 °C, 15 MPa, LiOH+H₃BO₃ chemistry) was systematically investigated, with a particular focus on the effects of displacement amplitude and normal load. Using a custom high-temperature and high-pressure autoclave system, the fretting corrosion response of Cr-coated cladding against Inconel 718 was evaluated through multiscale characterization. Results revealed that increasing displacement amplitude markedly intensified wear damage—evidenced by greater wear depth, volume, and Archard coefficient—and induced a transition from adhesive to abrasive-fatigue wear mechanisms. This evolution was accompanied by thinning or loss of the protective third body layer (TBL), suppression or exfoliation of the tribologically transformed structure (TTS), and pronounced plastic deformation layer (PDL) in the underlying Cr coating. Conversely, increasing normal load enhanced TBL compaction, reduced TTS cracking, and mitigated subsurface damage. These findings establish a mechanistic framework for understanding and optimizing the fretting corrosion resistance of Cr-coated Zr claddings under PWR conditions.

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模拟压水堆原生水微动腐蚀下cr包覆Zr合金熔覆层摩擦层演化及亚表面组织转变

系统研究了cr包覆Zr合金包层在模拟压水堆（PWR）一次水（315°C, 15 MPa， LiOH+H₃BO₃化学）中的微动腐蚀，重点研究了位移幅值和正常载荷的影响。使用定制的高温高压蒸压釜系统，通过多尺度表征来评估cr包覆层对Inconel 718的微动腐蚀响应。结果表明，位移振幅的增加显著加剧了磨损损伤（表现为磨损深度、体积和阿卡德系数的增加），并导致了从黏着磨损机制向磨粒疲劳磨损机制的转变。这种演变伴随着第三保护层（TBL）的变薄或丢失，摩擦转化结构（TTS）的抑制或脱落，以及Cr涂层中明显的塑性变形层（PDL）。相反，增加正常载荷可增强TBL压实，减少TTS开裂，减轻地下损伤。这些发现为理解和优化压水堆条件下cr包覆Zr包层的抗微动腐蚀性能建立了一个机制框架。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.