Enhancing corrosion resistance of non-equiatomic FeNiCoCr high-entropy alloys via metalloid Si alloying

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-08-22 DOI:10.1016/j.intermet.2025.108963

Pengfei Wu , Dingshun Yan , Yong Zhang , Zhiming Li

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Abstract

This study investigated the electrochemical corrosion behaviors of a Si-containing high strength and ductile non-equiatomic Fe₃₀Ni₂₀Co₂₀Cr₂₀Si₁₀ high-entropy alloy (HEA) with a single-phase solid solution structure in a 3.5 wt% NaCl solution. Compared to Si-free Fe₂₀Ni₂₀Co₂₀Cr₂₀Mn₂₀ and Fe₄₀Ni₂₀Co₂₀Cr₂₀ HEAs with identical Cr contents, the present HEA alloyed with metalloid Si shows prominent corrosion resistance with a significantly higher positive breakdown potential (∼1 V_SCE) and a lower current density (∼7.62 × 10⁻⁸ A/cm²). The elevated corrosion resistance is attributed to the reinforced stability of the passive film with modulated compositions by alloying of metalloid Si and elimination of Mn. The alloying of Si triggers the formation of (Fe, Cr)-mixed silicate in the passive film, yielding a high stability. In contrast, the presence of Mn oxides in the passive film of Fe₂₀Ni₂₀Co₂₀Cr₂₀Mn₂₀ degrades the anti-corrosion performance. These insights are useful for guiding the further development of strong and ductile alloys with superior anti-corrosion performance.

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通过类金属硅合金化提高非等原子FeNiCoCr高熵合金的耐蚀性

研究了含硅高强延展性非等原子Fe30Ni20Co20Cr20Si10高熵合金（HEA）在3.5 wt% NaCl溶液中的电化学腐蚀行为。与相同Cr含量的Fe20Ni20Co20Cr20Mn20和Fe40Ni20Co20Cr20 HEAs相比，本研究制备的类金属Si HEA合金具有显著的耐蚀性，具有更高的正击穿电位（~ 1 VSCE）和更低的电流密度（~ 7.62 × 10−8 a /cm2）。提高的耐蚀性是由于通过金属Si合金化和消除Mn的调制成分增强了钝化膜的稳定性。Si的合金化触发了钝化膜中（Fe, Cr）混合硅酸盐的形成，产生了高的稳定性。相反，Fe20Ni20Co20Cr20Mn20钝化膜中Mn氧化物的存在降低了其防腐性能。这些见解有助于指导进一步开发具有优异抗腐蚀性能的强韧性合金。

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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.