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

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 x 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 x 10-4 V and 4.7 x 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.