Effect of Nb content on the microstructure and corrosion resistance of FeCoCrNiNbx high-entropy alloys in chloride ion environment

In this paper, FeCoCrNiNbx high-entropy alloys were prepared by vacuum arc melting, and their micro-structure and corrosion resistance in a chloride ion environment were investigated. The results indicated that FeCoCrNi alloy was a single FCC solid solution and FeCoCrNiNbx alloy was a duplex alloy with FCC phase and Laves phase. FeCoCrNiNb0.15 showed the best corrosion resistance. The corrosion current density of FeCoCrNiNb0.15 decreased by one order compared with 316LSS, and the corrosion rate after the im-mersion experiment was only one-third of 316LSS. The P-N junction improved the corrosion resistance of the passive film of FeCoCrNiNb0.15, while the passive film of FeCoCrNi mainly exhibited n-type semi-conductor characteristics with less obvious p-type semiconductor characteristics.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

This paper investigates the microstructure and corrosion resistance of FeCoCrNiNbx high-entropy alloys in a chloride ion environment. The results show that FeCoCrNiNb0.15 alloy exhibits the best corrosion resistance, with significantly lower corrosion current density and corrosion rate compared to 316LSS. The P-N junction improves the corrosion resistance of the passive film of FeCoCrNiNb0.15, while the passive film of FeCoCrNi mainly exhibits n-type semiconductor characteristics.