Study on the Corrosion Behavior of Additively Manufactured NiCoCrFe_yMo_x High-Entropy Alloys in Chloride Environments.

IF 3.2 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2025-09-30 DOI:10.3390/ma18194544

Chaoqun Xie, Yaqing Hou, Youpeng Song, Zhishan Mi, Fafa Li, Wei Guo, Dupeng He

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Abstract

This study aims to determine the optimal Mo content for corrosion resistance in two alloys, FeCoCrNiMo_x and Fe_0.5CoCrNiMo_x. The alloys were fabricated using laser powder bed fusion (LPBF) technology with varying Mo contents (x = 0, 0.05, 0.1, 0.15). The corrosion behavior of these alloys was investigated in 3.5 wt.% NaCl solution at room temperature and 60 °C using electrochemical testing and X-ray photoelectron spectroscopy (XPS). The results show that all alloys exhibit good corrosion resistance at room temperature. However, at 60 °C, both alloys without Mo addition exhibit severe corrosion, while the Fe_0.5CoCrNiMo_0.1 alloy demonstrates the best corrosion resistance while maintaining the highest strength. The enhanced corrosion resistance is attributed to the optimal molybdenum addition, which refines the passive film structure and promotes the formation of Cr₂O₃. Furthermore, molybdenum oxide exists as MoO₄^2- ions on the surface of the passive film, significantly improving the alloy's corrosion resistance in chloride-containing environments.

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增材制备NiCoCrFeyMox高熵合金在氯化物环境中的腐蚀行为研究。

本研究旨在确定feccrnimox和Fe0.5CoCrNiMox两种合金耐蚀性能的最佳Mo含量。采用激光粉末床熔合（LPBF）技术制备不同Mo含量（x = 0, 0.05, 0.1, 0.15）的合金。采用电化学测试和x射线光电子能谱（XPS）研究了这些合金在室温和60℃下，在3.5 wt.% NaCl溶液中的腐蚀行为。结果表明，所有合金在室温下均具有良好的耐腐蚀性。然而，在60℃时，未添加Mo的两种合金都表现出严重的腐蚀，而Fe0.5CoCrNiMo0.1合金在保持最高强度的同时表现出最好的耐腐蚀性。抗腐蚀性能的提高主要是由于钼的加入优化了钝化膜的结构，促进了Cr2O3的形成。此外，钼氧化物以MoO42-离子的形式存在于钝化膜表面，显著提高了合金在含氯环境中的耐腐蚀性。

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

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.