Effects of W addition on the Corrosion Behaviors of FeCoNiCrMn High Entropy Alloy Composites in the 3.5 wt.% NaCl solution

The effects of W addition on the corrosion behaviors of FeCoNiCrMn high entropy alloy composites in 3.5 wt.%NaCl solution are investigated in this study. The X-ray diffraction and scanning electron microscopy suggest that the quantity of added W particles results in the increasing quantity of particles in the composites and large amount of cohesionless phases covering the matrix occur in the alloy with 1.0 molar ratio of W element. The trend of corrosion potential current density means that all W-added high entropy alloy composites have a better corrosion resistance referring to the base high entropy alloy composites and 0.8 molar ratio of W element into base generates a best corrosion resistance in the current work. The Electrochemical impedance spectra and compositional analysis of corroded surface of as-cast high entropy alloys demonstrate that W particles act as anode in the composites and Fe-Mn-Cr is as the cathode.