Influence of microstructure of CoCrNi medium entropy alloy on its corrosion behavior

Abstract

Purpose The purpose of this paper is to reveal the effect of microstructure on the corrosion behavior of CoCrNi alloy in 3.5 Wt.% NaCl solution. Design/methodology/approach The as-cast CoCrNi alloy was prepared by arc melting, and the cold-rolled and annealed alloys were prepared by processing the as-cast alloy. Findings The experimental results showed that a protective passivation film was formed on the surfaces of these CoCrNi MEA, and the stability and compactness of alloys increased in the sequence of cold-rolled, as-cast and annealed CoCrNi alloys. The annealed CoCrNi alloys had the best pitting resistance. Originality/value This study proposes the effect of the microstructure of CoCrNi alloy on corrosion resistance.