Crevice Corrosion Simulation of Single-Phase FCC Co–Cr–Fe–Ni–V High Entropy Alloy

Abstract

The primary objective of the present study is to simulate the crevice corrosion for the first time in a single-phase face-centered cubic (FCC) Co25Cr20Fe25Ni25V5 high entropy alloy (HEA) by finite element method including Tafel test for 72 and 168 h in a 2.4 M sodium chloride solution. This HEA has good galvanic degradation resistance with inferior degradation current per area of 1.1236 × 10–4 Acm−2 for 168 h. The maximum simulated crevice corrosion rate is 0.978 mmpy and 17.335 mmpy and the maximum electrolyte potential at the end of crevice tip is 2.68 × 10–4 V and 4.7 × 10–3 V after a time span of 24 and 168 h. The studied single-phase HEA exhibits enhanced crevice corrosion resistance which is attributed to the formation of constitutionally uniform oxide layer of Cr, Ni, and V. © The Indian Institute of Metals - IIM 2024.