Research on the corrosion resistance of FeCrMnAlCu x high-entropy alloys in 3.5% NaCl solution

Vacuum arc melting technology was employed to prepare FeCrMnAlCu x (x = 2.0, 1.5, 1.0, 0.5, 0) high-entropy alloys. The phase structure of the alloys and their microstructure before and after corrosion were characterized, and the corrosion performance of the alloys in 3.5% NaCl solution was analyzed. The research results indicated that the presence of the Cu element favored the formation of a face-centered cubic phase in the alloy. The corrosion type of the alloy was intergranular corrosion. The corrosion resistance of the alloy improved with the decrease in the Cu content. Specifically, at x = 0, the alloy displayed the lowest corrosion current density, while the corrosion potential was maximum (−0.382 V).