Galvanic corrosion mechanism regulated by heterogeneous phase in novel V-alloyed CoCrFeNiMn corrosion-resistant high-entropy alloys
Feng Han, Xinyi Huang, Chunyang Li, Yu Zhang, Chenghao Li, Caimei Wang
Abstract
This study investigates the influence of V element content on the galvanic corrosion behavior of (CoCrFeNiMn) 100-x V x ( x = 5, 10, 15, 20) high-entropy alloys (HEAs) in a 1 M H 2 SO 4 environment. Through comprehensive microstructural characterization, electrochemical testing, and numerical simulations, the research reveals that V content significantly modulates the phase composition, elemental segregation, corrosion behavior, and Volta potential differences between face-centered cubic (FCC) and Tetragonal (T) phases. The (CoCrFeNiMn) 90 V 10 HEAs exhibits optimal corrosion resistance, attributed to its balanced dual-phase structure and minimized potential difference (0.034 V), resulting in the lowest corrosion current density (9.4 × 10 −6 A/cm 2 ) and highest charge transfer resistance (165.0 Ω·cm 2 ). In contrast, higher V content intensifies galvanic corrosion due to larger potential disparities.