Corrosion behavior of CuCrFeNiMn high entropy alloy system in 1 M sulfuric acid solution

Immersion tests and potentiodynamic polarization measurements were conducted in 1 M sulfuric acid solution (H₂SO₄) at ambient temperature (～25 °C) to investigate the corrosion behavior of CuCrFeNiMn alloy system. The results show that the alloys display a good general corrosion resistance that is mainly influenced by the Cu content and elemental segregation degree. The corrosion resistance degrades when increasing Cu content and elemental segregation degree. Among the tested alloys, the CuCr₂Fe₂Ni₂Mn₂ alloy with low Cu content and elemental segregation degree displays a better general corrosion resistance. On the contrary, the Cu₂CrFe₂NiMn₂ alloy with high Cu content and elemental segregation degree exhibits the worst general corrosion resistance.