Abstract
In this paper, FeCoCrNiNbx high-entropy alloys were prepared by vacuum arc melting, and their microstructure 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 immersion 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 semiconductor characteristics with less obvious p-type semiconductor characteristics.
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