New understanding on the critical factors determining stability of passive film on Fe-Cr alloy based on aberration-corrected TEM study
New understanding on the critical factors determining stability of passive film on Fe-Cr alloy based on aberration-corrected TEM study
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DOI：
10.1108/acmm-09-2023-2891
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发表时间：
2023-12
影响因子：
1.2
通讯作者：
B. Zhang;X.X. Wei;X.L. Ma
中科院分区：
文献类型：
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作者：
B. Zhang;X.X. Wei;X.L. Ma
目的近年来，利用像差校正透射电子显微镜，在原子尺度上实现了对钝化膜及其界面区结构演化的精确探测。本文旨在对影响铁铬合金钝化膜稳定性的关键因素这一问题作一简要综述，以表明作者的新认识和新观点。设计/方法/方式-单晶的引入使作者能够获得一个独特的金属/钝化膜界面，更好地表征界面区域的结构。作者使用像差校正TEM进行横截面观察，并以高空间和能量分辨率直接捕获整个薄膜的细节。结果除了钝化膜本身，界面区，包括金属/膜（Me/F）界面和相邻的金属侧，也是被攻击的网站。因此，界面区的性质，如微观结构、成分和原子构型，是决定钝化膜稳定性的关键因素之一。独创性/价值-破译决定钝化膜的稳定性的关键因素具有重要意义，一直是腐蚀科学中的一个基本问题。人们对钝化膜本身的性质给予了极大的关注。相反，钝化膜和金属之间的界面的可能作用很少被考虑。基于先进的高空间分辨率分析工具，阐明了界面结构对钝化膜宏观稳定性的重要作用。
Purpose In recent years, using aberration-corrected transmission electron microscopy, the authors have achieved precisely detecting the structural evolution of passive film as well as its interface zone at atomic scale. The purpose of this paper aims to make a brief review to show the authors’ new understanding and perspective on the issue of critical factors determining stability of passive film of Fe-Cr alloy. Design/methodology/approach The introduction of single crystal enabled the authors to obtain a distinct metal/passive film interface and better characterize the structure of the interface region. The authors use aberration-corrected TEM to conduct cross-sectional observation and directly capture the details across the entire film at a high spatial and energy resolution. Findings Apart from the passive film itself, the interface zone, including metal/film (Me/F) interface and the adjacent metal side, is also the site which is attacked. Accordingly, the nature of the interface zone, such as microstructure, composition and atomic configuration, is one of the critical factors determining the stability of passive film. Originality/value Deciphering the critical factors determining the stability of passive film is of great significance and has been a fundamental issue in corrosion science. Great attention has been paid to the nature of the passive film itself. In contrast, the possible role of the interface between the passive film and the metal is rarely taken into account. Based on the advanced analytical tool with high spatial resolution, the authors have specified the significant role of interface structures on the macro-scale stability of passive film.