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<p>AlCoCrFeNi<sub>2.1</sub> eutectic high-entropy alloys with excellent mechanical properties have received increasing attention in recent years, while the corrosion resistance of the alloy is rarely reported. This work investigated the corrosion and passive behaviors of as-cast and heat-treated (maintain at 1200&#xa0;°C for 3&#xa0;h and then quenched in water) AlCoCrFeNi<sub>2.1</sub> eutectic high-entropy alloys by electrochemical tests, as well as some surface characterizations, including scanning electron microscopy, energy-dispersive spectroscopy, atomic force microscopy, and x-ray photoelectron spectroscopy. Results showed that the heat-treat method was beneficial to the corrosion resistance of the alloy. The local contact potential difference (<i>V</i><sub>CPD</sub>) between the FCC and B2 phases of heat-treated alloy was less than that of as-cast alloy. Mott–Schottky curve measurement illustrated that the heat-treatments did not alert the semiconducting types of the passive films formed on the AlCoCrFeNi<sub>2.1</sub> EHEAs, but reduced the defect concentration in the films. Changes in chromium oxide content, aluminum oxide content and O<sup>2−</sup>/OH<sup>−</sup> ratio were one of the reasons that heat-treatment affecting the passive film property.</p>

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Comparison of Electrochemical Characteristics and Passive Behavior of As-Cast and Heat-Treated AlCoCrFeNi2.1 Eutectic High-Entropy Alloys in Cl−Containing Sulfuric Acid Solution

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Song Longfei,
  • Hu Wenbin,
  • Li Xingxing,
  • Zeng Cheng,
  • Liao Bokai,
  • Wan Shan,
  • Guo Xingpeng

摘要

AlCoCrFeNi2.1 eutectic high-entropy alloys with excellent mechanical properties have received increasing attention in recent years, while the corrosion resistance of the alloy is rarely reported. This work investigated the corrosion and passive behaviors of as-cast and heat-treated (maintain at 1200 °C for 3 h and then quenched in water) AlCoCrFeNi2.1 eutectic high-entropy alloys by electrochemical tests, as well as some surface characterizations, including scanning electron microscopy, energy-dispersive spectroscopy, atomic force microscopy, and x-ray photoelectron spectroscopy. Results showed that the heat-treat method was beneficial to the corrosion resistance of the alloy. The local contact potential difference (VCPD) between the FCC and B2 phases of heat-treated alloy was less than that of as-cast alloy. Mott–Schottky curve measurement illustrated that the heat-treatments did not alert the semiconducting types of the passive films formed on the AlCoCrFeNi2.1 EHEAs, but reduced the defect concentration in the films. Changes in chromium oxide content, aluminum oxide content and O2−/OH− ratio were one of the reasons that heat-treatment affecting the passive film property.