Influence of Cr and Al contents on the corrosion resistance of FeCrAl coatings on Zry-4 under simulated pressurized water reactor conditions

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2024-12-16 DOI:10.1016/j.apsusc.2024.162113

Xiaohan Deng, Haiyan Liao, Weijiu Huang, Haibo Ruan, Yuan Niu, Kangkai Yan, Pengzhou Zhu, Xiangkong Xu, Yongyao Su

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Abstract

This study explores the impact of Cr (13 wt%, 23 wt%) and Al (3 wt%, 5 wt%, 7 wt%) content on the corrosion resistance of FeCrAl coatings deposited on Zry-4 substrates via magnetron sputtering, under simulated pressurized water reactor (PWR) conditions (360 °C, 18.6 MPa). The findings reveal that increasing Cr and Al content enhances the density and mechanical strength of the coatings, with Cr playing a more dominant role in corrosion resistance. Coatings with 23 wt% Cr exhibited significantly better corrosion resistance than those with 13 wt% Cr, primarily due to reduced Fe₂O₃ formation and the development of a denser FeFe_2-x-yCr_xAl_yO₄ spinel layer, which effectively blocks the outward diffusion of Fe and the penetration of corrosive medium. The first principles simulation of H₂O adsorption on FeCrAl surface further verified the excellent stability and corrosion resistance of chrome-rich coating in aqueous environment. This study underscores the critical importance of Cr in optimizing FeCrAl coatings for PWR conditions, offering valuable insights for their application in nuclear systems.

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在模拟压水反应堆条件下，铬和铝含量对 Zry-4 上铁铬铝涂层耐腐蚀性的影响

本研究探讨了在模拟加压水反应堆（PWR）条件（360 °C、18.6 兆帕）下，铬（13 wt%、23 wt%）和铝（3 wt%、5 wt%、7 wt%）含量对通过磁控溅射沉积在 Zry-4 基材上的铁铬铝涂层耐腐蚀性的影响。研究结果表明，增加铬和铝的含量可提高涂层的致密度和机械强度，其中铬在耐腐蚀性方面发挥着更主要的作用。Cr 含量为 23 wt% 的涂层的耐腐蚀性明显优于 Cr 含量为 13 wt% 的涂层，这主要是由于 Fe2O3 形成减少以及形成了更致密的 FeFe2-x-yCrxAlyO4 尖晶石层，从而有效阻止了铁的向外扩散和腐蚀介质的渗透。对 FeCrAl 表面吸附 H2O 的第一原理模拟进一步验证了富铬涂层在水环境中的优异稳定性和耐腐蚀性。这项研究强调了铬在优化适用于压水堆条件的铁铬铝涂层中的关键作用，为其在核系统中的应用提供了宝贵的见解。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.