The grain size effect on corrosion property of Al<inf>2</inf>Cr<inf>5</inf>Cu<inf>5</inf>Fe<inf>53</inf>Ni<inf>35</inf> high-entropy alloy in marine environment

The influence of grain size on the localized corrosion properties of a new high-entropy alloy (Al2Cr5Cu5Fe53Ni35) in seawater is investigated in the present study. After Al2Cr5Cu5Fe53Ni35 alloy undergoes cold rolling and annealing, its grain size will vary accordingly, resulting in different corrosion behaviors. The microstructural evolutions after different treated conditions are characterized by XRD, SEM, EDS and EBSD, whereas the corrosion properties are measured by potentiodynamic, potentiostatic and EIS experiments. The properties of the passive layer was studied with XPS and SIMS. The Point Defect Model approach is employed to analysis the data obtained from electrochemical experiments. The results show that by decreasing the grain size, the localized corrosion resistance of the material is enhanced.