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<p>This study investigates the electrochemical corrosion behaviour of a wide range of Cu<sub>x</sub>Mn<sub>y</sub>Zn<sub>z</sub>Ni<sub>5</sub>Al<sub>2.5</sub> high entropy brasses (HEBs) in 0.6&#xa0;M NaCl. The so-called HEBs are a novel alloy system, with the present work one of the first studies of their corrosion behaviour. Sixteen compositions were synthesised and characterised, revealing a stable single-phase FCC microstructure across all variants. Cyclic potentiodynamic polarisation testing demonstrated a strong correlation between corrosion rate and Cu: Mn ratio, with higher Cu content yielding more noble potentials and lower corrosion current densities. The findings highlight the critical role of compositional design - particularly the Cu and Mn balance - in optimising corrosion performance of HEBs, offering a pathway for engineering advanced brasses for service conditions.</p>

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Corrosion behaviour of CuxMnyZnzNi5Al2.5 high entropy brasses

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • M. Ghorbani,
  • K. J. Laws,
  • N. Birbilis

摘要

This study investigates the electrochemical corrosion behaviour of a wide range of CuxMnyZnzNi5Al2.5 high entropy brasses (HEBs) in 0.6 M NaCl. The so-called HEBs are a novel alloy system, with the present work one of the first studies of their corrosion behaviour. Sixteen compositions were synthesised and characterised, revealing a stable single-phase FCC microstructure across all variants. Cyclic potentiodynamic polarisation testing demonstrated a strong correlation between corrosion rate and Cu: Mn ratio, with higher Cu content yielding more noble potentials and lower corrosion current densities. The findings highlight the critical role of compositional design - particularly the Cu and Mn balance - in optimising corrosion performance of HEBs, offering a pathway for engineering advanced brasses for service conditions.