Enhance corrosion resistance via passivation treatment for CrMnFeCoNi high-entropy alloy prepared by hot isostatic pressing

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-05-24 DOI:10.1016/j.intermet.2025.108846

Jiahao Liu , Dianchun Ju , Jing Zhang , Yuji Cheng , Zhanfang Wu , Lida Che , Xiangyang Li , Zhoujin Lv

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Abstract

CrMnFeCoNi high-entropy alloy (HEA) with equiatomic ratios was prepared through hot isostatic pressing, followed by a passivation treatment to enhance its corrosion resistance. The corrosion behavior and underlying mechanisms of the passivated alloy in 0.5M H₂SO₄ were systematically examined. The results demonstrated that passivation effectively removed harmful sulfide inclusions from the alloy surface and facilitated the formation of a protective passive film. Electrochemical tests revealed a decrease in corrosion current density (I_corr = 1.63 × 10⁻⁵A·cm⁻²) and an increase in corrosion potential (E_corr = -285 mV) following passivation. Grain boundary corrosion was identified as the dominant corrosion type. X-ray photoelectron spectroscopy (XPS) analysis showed that the passivation treatment enhanced the chromium content and reduced the manganese content in the passive film. Additionally, the oxide/hydroxide ratio in the film was increased, improving its protective properties and thereby enhancing the alloy's corrosion resistance.

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对热等静压法制备的crmnnfeconi高熵合金进行钝化处理，提高其耐蚀性

采用热等静压法制备了等原子比的crmnnfeconi高熵合金（HEA），并对其进行了钝化处理，以提高其耐蚀性。系统地研究了钝化合金在0.5M H2SO4中的腐蚀行为及其机理。结果表明，钝化处理能有效去除合金表面有害的硫化物夹杂物，有利于形成钝化保护膜。电化学测试表明，钝化后腐蚀电流密度（Icorr = 1.63 × 10−5A·cm−2）降低，腐蚀电位（Ecorr = -285 mV）升高。晶界腐蚀是主要的腐蚀类型。x射线光电子能谱（XPS）分析表明，钝化处理提高了钝化膜中铬的含量，降低了锰的含量。此外，提高了膜中的氧化物/氢氧化物比，提高了膜的防护性能，从而提高了合金的耐腐蚀性。

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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.