Exceptional high-temperature corrosion resistance of multi-component alloys via modulating Al and Nb

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

Corrosion Science Pub Date : 2025-04-28 DOI:10.1016/j.corsci.2025.112990

Hao Shi , Xukai Zhang , Chang Liu , Xing Gong , Yue Li , Raheleh Azmi , Yilun Gong , Dirk Ponge , Alfons Weisenburger , Georg Müller

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Abstract

The chemical compatibility of metallic materials with thermal transfer/storage media, which often involves aggressive working conditions (i.e., high-temperature, corrosive environments), challenges the safe operations of advanced and sustainable energy-related infrastructures. Here, we report the corrosion-oxidation behaviors of three multi-component alloys (MCAs) when exposed to a corrosive heavy-liquid metal condition (i.e., molten Pb at 650 ℃ with 10⁻⁶ wt% oxygen dissolved). The two compositions, Al_0.36Cr_0.67FeNi_0.98 (HAl11) and Al_0.27Cr_0.71FeNi_1.16Nb_0.17 (HAl8^Nb), show excellent corrosion-resistance via passivating a protective oxide scale on the alloy surface. Further characterizations of the oxide layers differentiate their corrosion-oxidation mechanisms: a protective Al₂O₃ oxide layer (with Cr and Fe segregation outmost) formed on HAl11 and a duplex oxide layer (outward growth of FeCr₂O₄/Cr₂O₃ layer plus inward growth of an Al₂O₃ layer) with internal oxidation on HAl8^Nb. Adding Nb improved the corrosion-oxidation resistance (“Nb-doping effect”) by enhancing the outward diffusion of metallic elements and promoting the rapid establishment of an alumina scale. Besides, the presence of AlNbO₄, which was predicted by thermodynamics calculation, lying between the spinel and Al₂O₃ formation, was also confirmed by experimental observations. Our findings advance the mechanistic understanding of MCAs’ performances in extreme conditions and provide novel strategies for designing corrosion-resistant alloys targeting aggressive application environments.

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通过调制Al和Nb的多组分合金具有优异的高温耐腐蚀性

金属材料与热传递/存储介质的化学相容性通常涉及恶劣的工作条件（即高温、腐蚀性环境），这对先进和可持续能源相关基础设施的安全运行提出了挑战。在这里，我们报告了三种多组分合金（MCAs）在腐蚀性重液态金属条件下的腐蚀氧化行为（即650℃熔融Pb，溶解氧为10 - 6 wt%）。这两种成分Al0.36Cr0.67FeNi0.98 （HAl11）和Al0.27Cr0.71FeNi1.16Nb0.17 （HAl8Nb）通过钝化合金表面的保护性氧化皮，表现出优异的耐腐蚀性。氧化层的进一步表征区分了它们的腐蚀氧化机制：在HAl11上形成一个保护性的Al2O3氧化层（Cr和Fe在最外面偏析），在HAl8Nb上形成一个双氧化层（FeCr2O4/Cr2O3层向外生长，Al2O3层向内生长），内部氧化。Nb的加入增强了金属元素的向外扩散，促进了氧化铝结垢的快速建立，从而提高了材料的抗腐蚀氧化性（“Nb掺杂效应”）。此外，实验结果也证实了热力学计算预测的尖晶石与Al2O3形成之间存在AlNbO4。我们的研究结果促进了对MCAs在极端条件下性能的机理理解，并为设计针对恶劣应用环境的耐腐蚀合金提供了新的策略。

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.