Corrosion behavior of VCrFeCoNi medium-entropy alloy in chloride solution
Sujung Son, Jaeik Kwak, Farahnaz Haftlang, Hyeonseok Kwon, Yong‐Tae Kim, Sunghak Lee, Hyoung Seop Kim
Abstract
The present work investigates the corrosion properties and passivation layer of VCrFeCoNi medium-entropy alloy (V-MEA). The V-MEA exhibits the corrosion current density of ∼0.101 μA and corrosion potential of ∼ -0.336 V with a broad passivation region of ∼0.763 V from the potentiodynamic polarization measurement. The V-MEA shows the multilayer passivation with vanadium oxides-rich outer layer and chromium oxide-rich inner layer. The outer layer as a cation-selective layer defeats Cl− ions and the inner layer as an anion-selective species captures the Cl− ions. Resultantly, fewer Cl− ions can go through the passivation layer, leading to the broad passivation region of V-MEA.