Effect of Mo and aging temperature on corrosion behavior of (CoCrFeNi)100-Mo high-entropy alloys

By Wenrui Wang, Jieqian Wang, Zhihui Sun, Jiangtao Li, Laifeng Li, Xin Song, Xi-xing Wen, Lu Xie, Xiao Yang. 2020

136 citations recorded by the source corpus.

Abstract The present work investigates the influence of Mo additive and aging temperatures on the microstructure and corrosion behavior in 3.5% NaCl solution. The microstructure of (CoCrFeNi)100-xMox(x = 1, 2, 3) alloys aged at 700 °C and 900 °C comprises single FCC solid solution structure. When the Mo content increases from 1% to 2%, the polarization curves and electrochemical impedance spectroscopy in 3.5% NaCl solution indicate that the corrosion resistance of the alloys gradually increases with increasing aging temperature and Mo content. However, the corrosion resistance of (CoCrFeNi)97Mo3 alloy aged at 900 °C decreased suddenly. XPS analysis reveals that the main components of the passive film are Cr2O3 and MoO3, and the intensity of Cr2O3 and MoO3 in the passive film tends to increase with Mo increases from 1% to 2%, which can improve the stability of the passive film. The first-principles calculation was used to understand the effect of Cl− on the pitting mechanism of the passive film.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/f86e9683b24b64af1c28cc6b3d887c5e7c7247b4