Abstract
Comprehensive investigations on the impact of Ce doping on the pitting resistance of Fe40Mn20Cr20Ni20 high-entropy alloys in 3.5% NaCl solution were conducted with an emphasis on the inclusions involved. The correlation between the variations of the type, number and size of inclusions and the doping of Ce were identified. The increased pitting resistance of the alloy induced by the doping of Ce was found associated with higher metastable pitting potentials and steady-state pitting potentials. The morphology evolution with the inclusions captured by SEM images and EDS mapping strongly indicated an existence a double-layer structure in Ce-doped Fe40Mn20Cr20Ni20 high-entropy alloys. An evident irregular pitting propagation path was probed in Ce-doped samples.
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