Scholarlink

<p>The microstructure, phase composition and corrosion resistance of the as-cast CoCrFeNiMo<sub>x</sub> (<i>x</i> = 0.1, 0.3, 0.5) high-entropy alloys (HEAs) in 1&#xa0;M NaCl and 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub> solutions were studied. It was determined that the as-cast samples have a dendritic microstructure, in which the dendrites are a face-centered cubic solid solution, and an σ-phase intermetallic is precipitated into the interdendritic space. The lowest corrosion resistance in both solutions is demonstrated by the sample with a molybdenum content of <i>x</i> = 0.1. In 1&#xa0;M NaCl salt solution, CoCrFeNiMo<sub>0.5</sub> HEA showed the best performance with a corrosion potential (<i>E</i><sub>corr</sub>) of − 0.135&#xa0;V and current density (<i>I</i><sub>corr</sub>) of 0.23&#xa0;μA/cm<sup>2</sup>, on the other hand, CoCrFeNiMo<sub>0.3</sub> HEA demonstrated the best corrosion resistance in 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub> solution showcasing an <i>E</i><sub>corr</sub> = − 0.047&#xa0;V and <i>I</i><sub>corr</sub> = 7.05&#xa0;μA/cm<sup>2</sup>. Microstructural observations after corrosion test revealed that dendrites are mainly attacked by the aggressive ions and the σ-phase was practically not corroded by the aggressive environment.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Corrosion Resistance of CoCrFeNiMox (x = 0.1, 0.3, 0.5) High-Entropy Alloys in Aggressive Aqueous Solutions Containing Cl− or SO42− Ions

  • 期刊论文

  • 发表日期：

    2025年3月31日

查看全文
  • Olga Samoilova,
  • Svetlana Pratskova,
  • Nataliya Shaburova,
  • Ahmad Ostovari Moghaddam,
  • Evgeny Trofimov

摘要

The microstructure, phase composition and corrosion resistance of the as-cast CoCrFeNiMox (x = 0.1, 0.3, 0.5) high-entropy alloys (HEAs) in 1 M NaCl and 0.5 M H2SO4 solutions were studied. It was determined that the as-cast samples have a dendritic microstructure, in which the dendrites are a face-centered cubic solid solution, and an σ-phase intermetallic is precipitated into the interdendritic space. The lowest corrosion resistance in both solutions is demonstrated by the sample with a molybdenum content of x = 0.1. In 1 M NaCl salt solution, CoCrFeNiMo0.5 HEA showed the best performance with a corrosion potential (Ecorr) of − 0.135 V and current density (Icorr) of 0.23 μA/cm2, on the other hand, CoCrFeNiMo0.3 HEA demonstrated the best corrosion resistance in 0.5 M H2SO4 solution showcasing an Ecorr = − 0.047 V and Icorr = 7.05 μA/cm2. Microstructural observations after corrosion test revealed that dendrites are mainly attacked by the aggressive ions and the σ-phase was practically not corroded by the aggressive environment.