Defending against fluorine corrosion: Insights from FeCoNiCrMo high-entropy alloy behavior in hydrofluoric acid solutions

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-14 DOI:10.1016/j.jmrt.2024.09.097
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Abstract

The surging demand for advanced fluorine corrosion-resistant materials underscores their significance in ensuring operational safety and reliability across various industries. This study investigates the corrosion behavior of the FeCoNiCrMo high-entropy alloy (HEA) via a series of 28-day immersion tests in hydrofluoric acid (HF) solutions. The results demonstrate the FeCoNiCrMo HEA's superior corrosion-resistant performance in HF environments, exhibiting remarkably low corrosion rates of 0.179 mm/y, 0.276 mm/y, and 0.352 mm/y in 20 vol%, 30 vol%, and 40 vol% HF solutions, respectively. Comprehensive phase and microstructural characterizations were conducted on samples exposed to the 40 vol% HF solution to elucidate the corrosion mechanisms. The study revealed that localized pitting corrosion preferentially initiates within the interdendritic regions of the HEA matrix upon HF exposure. During the intermediate stage, micro-galvanic corrosion occurs between the dendritic arms and interdendritic regions, leading to the formation of a uniform and compact corrosion product film on the alloy surface. This film, enriched with Mo, Cr, and O, provides temporary protection. However, as corrosion progresses, the partial detachment of particulate corrosion products compromises the integrity of the film, resulting in increased dissolution within the interdendritic regions and the formation of irregular corrosion grooves in the later stage. These insights significantly enhance the understanding of the corrosion mechanisms of FeCoNiCrMo HEA in HF environments and provide valuable guidance for developing innovative protective materials designed for fluorine-rich engineering applications.

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抵御氟腐蚀:氢氟酸溶液中铁钴镍铬钼高熵合金行为的启示
各行各业对先进氟耐腐蚀材料的需求急剧增加,这凸显了这些材料在确保运行安全性和可靠性方面的重要作用。本研究通过一系列在氢氟酸(HF)溶液中浸泡 28 天的测试,研究了铁钴镍铬钼高熵合金(HEA)的腐蚀行为。结果表明,铁钴镍铬钼高熵合金在氢氟酸环境中具有优异的耐腐蚀性能,在 20 vol%、30 vol% 和 40 vol% 的氢氟酸溶液中分别表现出 0.179 mm/y、0.276 mm/y 和 0.352 mm/y 的极低腐蚀速率。对暴露在 40 vol% HF 溶液中的样品进行了全面的相和微结构表征,以阐明腐蚀机理。研究结果表明,在暴露于氢氟酸溶液时,局部点蚀优先在 HEA 基体的树枝间区域开始。在中间阶段,树枝状臂和树枝状间区域之间会发生微电蚀作用,从而在合金表面形成一层均匀致密的腐蚀产物膜。这层富含钼、铬和 O 的薄膜可提供临时保护。然而,随着腐蚀的进行,颗粒状腐蚀产物的部分脱落破坏了膜的完整性,导致树枝状区域内的溶解增加,并在后期形成不规则的腐蚀沟槽。这些见解大大加深了人们对高频环境下铁钴镍铬钼 HEA 腐蚀机理的理解,并为开发针对富氟工程应用的创新保护材料提供了宝贵的指导。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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