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<p>CrCoNi is a typical medium-entropy alloy (MEA) with significant potential for engineering applications owing to its superior mechanical performances. However, in aggressive service environment, it is still necessary to improve its corrosion resistance to support its wider implementation in industrial fields. In this work, CrCoNi MEAs with different lanthanum (La) additions were fabricated via vacuum arc melting, and the influences of La content on the electrochemical corrosion response and passive film characteristics were systematically investigated. The results indicate that 0.1 at% La addition refines the columnar dendrites of the CrCoNi MEA and promotes the generation of Cr<sub>2</sub>O<sub>3</sub> within the passive layer, which in turn strengthens the corrosion resistance of the CrCoNi MEA. Conversely, excessive La addition promotes the formation of LaNi<sub>5</sub> phases in the interdendritic regions, inducing galvanic corrosion and diminishing the alloy’s corrosion performance. Our work reveals the positive contribution of La microalloying toward improved corrosion resistance and thus provides insights into the compositional design of high-performance MEAs.</p>

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Manipulation of the microstructure and corrosion resistance of CrCoNi medium-entropy alloy via La microalloying

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Danhong Wang,
  • Xianqi Meng,
  • Xiaowei Lei,
  • Dayuan Wang,
  • Wenchao Xia,
  • Nan Wang

摘要

CrCoNi is a typical medium-entropy alloy (MEA) with significant potential for engineering applications owing to its superior mechanical performances. However, in aggressive service environment, it is still necessary to improve its corrosion resistance to support its wider implementation in industrial fields. In this work, CrCoNi MEAs with different lanthanum (La) additions were fabricated via vacuum arc melting, and the influences of La content on the electrochemical corrosion response and passive film characteristics were systematically investigated. The results indicate that 0.1 at% La addition refines the columnar dendrites of the CrCoNi MEA and promotes the generation of Cr2O3 within the passive layer, which in turn strengthens the corrosion resistance of the CrCoNi MEA. Conversely, excessive La addition promotes the formation of LaNi5 phases in the interdendritic regions, inducing galvanic corrosion and diminishing the alloy’s corrosion performance. Our work reveals the positive contribution of La microalloying toward improved corrosion resistance and thus provides insights into the compositional design of high-performance MEAs.