Hot corrosion of high-entropy alloys induced by KCl-55%ZnCl2 molten salt films in air

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-03 DOI:10.1016/j.jallcom.2025.184181

Hailiang Zhang, Jiangtao Wu, Qian Wang, Chaoliu Zeng

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Abstract

This study investigates the effects of reactive elements Cr, Al and Si on the corrosion behavior of high-entropy alloys (HEAs) under KCl-55 at.% ZnCl₂ salt films at 450 °C. The mass loss of the Fe_18.9Co_19.2Ni_18.9Cr_18.9Al_19.3Si_4.8 high-entropy alloy after 80 hours of corrosion was only 46.56 mg/cm², which is 81.68%, 81.39%, and 72.49% lower than that of Fe_24.9Co_25.4Ni_25.1Cr_24.6, Fe_24.9Co_25.2Ni_25.5Al_24.3, and Fe_21.0Co_20.3Ni_18.6Cr_21.9Al_18.2, respectively. This result clearly demonstrates the significantly superior corrosion resistance of the FeCoNiCrAlSi high-entropy alloy. In the KCl-55 at.% ZnCl₂ environment, HEAs develop preferential dissolution zones and even depletion zones of Cr and Al, which provide diffusion pathways for corrosive media into the alloy matrix, accelerating degradation. Notably, the addition of 4.8 at.% Si promotes the formation of a continuous composite oxide film composed of Cr, Al, Ni, Si, and other elements on the surface of the Fe_18.9Co_19.2Ni_18.9Cr_18.9Al_19.3Si_4.8 high-entropy alloy, effectively isolating the alloy from corrosive species and reducing corrosion rates. Nevertheless, intergranular corrosion was observed within the substrate of the FeCoNiCrAlSi high-entropy alloy, indicating that structural weaknesses at the grain boundaries may still pose a risk of failure during long-term service.

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KCl-55%ZnCl2熔盐膜诱导高熵合金在空气中的热腐蚀

研究了活性元素Cr、Al和Si对高熵合金（HEAs）在KCl-55下腐蚀行为的影响。% ZnCl2盐膜在450°C。腐蚀80 h后，Fe18.9Co19.2Ni18.9Cr18.9Al19.3Si4.8高熵合金的质量损失量仅为46.56 mg/cm2，比Fe24.9Co25.4Ni25.1Cr24.6、Fe24.9Co25.2Ni25.5Al24.3和Fe21.0Co20.3Ni18.6Cr21.9Al18.2分别降低了81.68%、81.39%和72.49%。这一结果清楚地证明了FeCoNiCrAlSi高熵合金具有明显优越的耐腐蚀性。在KCl-55上。在% ZnCl2环境下，HEAs形成了Cr和Al的优先溶解区甚至损耗区，为腐蚀介质进入合金基体提供了扩散途径，加速了合金的降解。值得注意的是，增加了4.8个百分点。% Si促进了Fe18.9Co19.2Ni18.9Cr18.9Al19.3Si4.8高熵合金表面由Cr、Al、Ni、Si等元素组成的连续复合氧化膜的形成，有效地将合金与腐蚀物质隔离，降低了腐蚀速率。然而，在FeCoNiCrAlSi高熵合金的基体中观察到晶间腐蚀，这表明晶界处的结构弱点在长期使用期间仍可能造成失效的风险。

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

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.