Effect of Inhibitors on the Critical Pitting Temperature of the High-Entropy Alloy Co1.5CrFeNi1.5Ti0.5Mo0.1

The purpose of this study is to investigate the effect of inorganic/organic inhibitors on the pitting potential (E pit ) and critical pitting temperature (CPT) of the high-entropy alloy Co 1.5 CrFeNi 1.5 Ti 0.5 Mo 0.1 in chloride solutions using potentiodynamic polarization tests. The results indicate that six anions all retard the occurrence of pitting corrosion; the inhibitive effect decreases in the order: nitrates≒ benzonates>acetates≒ perchlorates>citrates>molybdates. The SEM micrographs show that perchlorates and citrates inhibit propagation of stable pits; acetates and molybdates restrain nucleation of stable pits.