Analysis of the microstructure and corrosion behavior of FeCoNiCrMnAlX high-entropy alloy coatings

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-01-14 DOI:10.1016/j.intermet.2025.108652

Dongyao Zhang , Yun Tian , Xingye Mao , Yuxin Wang , Yanqi Zhao , Chunli Qiu , Keping Geng , Yanchun Dong , Yong Yang , Hongjian Zhao

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Abstract

To study the corrosion behavior of high-entropy alloy coatings in alkaline solutions, FeCoNiCrMnAl_0.5 and FeCoNiCrMnAl_1.0 powders were prepared by mechanical alloying, and their coatings were coated on the surface of 316L stainless steel by plasma spraying technology. The corrosion resistance of the coatings in 1.0 mol/L NaOH solution was tested using an electrochemical workstation. The FeCoNiCrMnAl_0.5 coating consists of a dual phase of FCC phase and Al₂O₃ phase, and the FeCoNiCrMnAl_1.0 coating consists of FCC phase, BCC phase, and Al₂O₃ phase. In 1.0 mol/L NaOH solution, both coatings showed an obvious passivation phenomenon. The corrosion current densities of FeCoNiCrMnAl_0.5 coating and FeCoNiCrMnAl_1.0 coating were 1.006 × 10⁻⁵ A/cm² and 7.051 × 10⁻⁶ A/cm², respectively, and the corrosion potentials were −0.5277V and −0.5116V, respectively, which were higher than that of the corrosion potential of 316L stainless steel of −0.6572 V. The corrosion rates were 0.529 mg/(cm²/h) and 0.671 mg/(cm²/h), respectively, both lower than the corrosion rate of 316L stainless steel of 0.878 mg/(cm²/h).

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FeCoNiCrMnAlX 高熵合金涂层的微观结构和腐蚀行为分析

为了研究高熵合金涂层在碱性溶液中的腐蚀行为，采用机械合金化方法制备了 FeCoNiCrMnAl0.5 和 FeCoNiCrMnAl1.0 粉末，并通过等离子喷涂技术将其涂层涂覆在 316L 不锈钢表面。使用电化学工作站测试了涂层在 1.0 mol/L NaOH 溶液中的耐腐蚀性。FeCoNiCrMnAl0.5 涂层由 FCC 相和 Al2O3 相组成，FeCoNiCrMnAl1.0 涂层由 FCC 相、BCC 相和 Al2O3 相组成。在 1.0 mol/L NaOH 溶液中，两种涂层都出现了明显的钝化现象。FeCoNiCrMnAl0.5 涂层和 FeCoNiCrMnAl1.0 涂层的腐蚀电流密度分别为 1.006 × 10-5 A/cm2和 7.051 × 10-6 A/cm2，腐蚀电位分别为-0.5277V和-0.腐蚀速率分别为 0.529 mg/(cm2/h) 和 0.671 mg/(cm2/h)，均低于 316L 不锈钢的腐蚀速率 0.878 mg/(cm2/h)。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.