Unveiling the reasons for corrosion resistance difference between two phases of the Fe40Cr40Ni20 duplex MEA in the transpassive region

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

Corrosion Science Pub Date : 2025-08-27 DOI:10.1016/j.corsci.2025.113277

Shu-Qian Jian, Zhu Wang, Zhi-Le Yang, Jia-Xu Ma, Chuang Yang, Jing Wang, Lei Zhang

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Abstract

The passive film structure and corrosion behavior of the MEA are characterized using electrochemical tests, XPS, ToF-SIMS and TEM. The obtained results indicate that the MEA is consisted of the Cr enriched BCC phase (Fe₃₇Cr₅₂Ni₁₁) and Ni enriched FCC phase (Fe₄₂Cr₃₂Ni₂₆). The passive film of the MEA displays a bilayer structure, where Fe, Ni oxides are accumulated in outer layer, while Cr oxides are concentrated in inner layer. The Cr content in passive film decreases with the increasing applied potential, resulting in the degradation of film at high potentials. The presence of NiCr₂O₄ in the passive film is confirmed by XPS, and its fraction in the Cr species increases with the applied potential, which suggests that NiCr₂O₄ is more stable than Cr₂O₃ at high potentials. Since high content of Ni is beneficial for the formation of NiCr₂O₄, the passive film on FCC phase in transpassive region is more stable than that on BCC phase. This is responsible for the preferential dissolution of BCC local film in transpassive region.

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揭示了Fe40Cr40Ni20双相MEA在透传区两相耐蚀性差异的原因

利用电化学测试、XPS、ToF-SIMS和TEM对MEA的钝化膜结构和腐蚀行为进行了表征。结果表明，MEA由富集Cr的BCC相（Fe37Cr52Ni11）和富集Ni的FCC相（Fe42Cr32Ni26）组成。MEA钝化膜呈双层结构，Fe、Ni氧化物集中在外层，Cr氧化物集中在内层。随着外加电位的增大，钝化膜中的Cr含量降低，导致高电位下膜的降解。XPS证实了NiCr2O4在钝化膜中的存在，并且随着外加电位的增大，NiCr2O4在Cr中所占的比例增大，表明NiCr2O4在高电位下比Cr2O3更稳定。由于高含量的Ni有利于NiCr2O4的形成，因此FCC相的钝化膜比BCC相的钝化膜更稳定。这是BCC局部膜在透射区优先溶解的原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.