Pitting corrosion of the high-entropy alloy Co1.5CrFeNi1.5Ti0.5Mo0.1 in chloride-containing sulphate solutions

The purpose of this study is to investigate the effect of SO42- ions on the pitting potential (Epit) and critical pitting temperature (CPT) of high-entropy alloy Co1.5CrFeNi1.5Ti0.5Mo0.1 in chloride solutions. The results indicate that the values of CPT for the alloy in 0.1, 0.5, and 1 mol/L NaCl are 70, 60 and 60 °C, respectively; the values of Epit are linear with the logarithm of chloride concentrations at 70 and 80 °C; and the addition of SO42- ions to chloride solutions has a positive effect on both Epit and CPT as the ratio of SO42-/Cl− is higher than 0.5.