高温氧饱和铅铋共晶中Al2O3/Fe-Al涂层的稳定性、失效和自愈：对核反应堆保护涂层优化的启示

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

Corrosion Science Pub Date : 2025-07-13 DOI:10.1016/j.corsci.2025.113182

Jianghui Zhu , Lilong Pang , Bo Zhang , Pengfei Tai , Liangpei Liu , Hailong Chang , Xing Gao , Tielong Shen , Zhiwei Ma , Sihao Huang , Zhiguang Wang

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引用次数: 0

摘要

本研究研究了Al2O3/Fe-Al涂层在氧饱和铅铋共晶（LBE）环境下，在550°C和650°C下持续2000 h的微观组织演变和腐蚀行为。实验结果表明，在两种温度下，Fe-Al层中的Al继续扩散。经过长期测试，表面铝浓度保持较高，保持了涂层结构的稳定性。在550℃条件下，最外层的Al2O3层保持完整，没有明显的损伤。而在650℃时，原表面Al2O3层发生分层破坏，在Fe-Al层表面再生出具有大单晶的新Al2O3层。研究表明，在650℃时，Pb和O沿Al2O3晶界渗透，在Fe-Al和Al2O3层的界面处形成PbAl2O4氧化物。这一过程对Al2O3层的破坏和再生起着关键作用。这些发现阐明了Al2O3/Fe-Al涂层在氧饱和LBE环境中的失效和自修复机制，为涂层在LFR中的潜在应用提供了初步评估。

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Stability, failure and self-healing of Al2O3/Fe-Al coating in high-temperature oxygen-saturated lead-bismuth eutectic: Insights for protective coating optimization in nuclear reactors

This study investigates the microstructural evolution and corrosion behavior of Al₂O₃/Fe-Al coatings in oxygen-saturated lead-bismuth eutectic (LBE) environments at 550 °C and 650 °C over a duration of 2000 h. The experimental results indicate that Al in the Fe-Al layer continues to diffuse at both temperatures. The surface Al concentration remains high after long term test, maintaining the structural stability of the coating. Under the 550 °C condition, the outmost Al₂O₃ layer remains intact without significant damage. However, at 650 °C, the original surface Al₂O₃ layer undergoes delamination and failure, while a new Al₂O₃ layer with large single-crystal is regenerated on the Fe-Al layer surface. The study reveals that at 650 °C, Pb and O penetrate along the Al₂O₃ grain boundaries and form PbAl₂O₄ oxide at the interface between the Fe-Al and Al₂O₃ layers. This process plays a key role in the failure and regeneration of the Al₂O₃ layer. These findings elucidate the failure and self-healing mechanisms of Al₂O₃/Fe-Al coatings in oxygen-saturated LBE environments, providing a preliminary assessment of the coating's potential application in LFR.

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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.