Corrosion behavior and mechanism of FeCrNi medium entropy alloy prepared by powder metallurgy

摘要

The corrosion behavior and mechanism of a novel FeCrNi medium entropy alloy (MEA) prepared by powder metallurgy method in 3.5 wt% NaCl solution was investigated in this study. The results indicated that, compared with the 316L SS, the FeCrNi MEA exhibits outstanding corrosion resistance with a more positive breakdown potential (0.982 V-SCE) and lower current density (8.317 x 10(-8)A/cm(2)). The passive film formed on the surface of the FeCrNi MEA is a Cr-riched and less defective film. At the same time, it also has a strong self-healing ability. Uniform microstructure and high Cr content are responsible for the good anti-corrosion performance. (C) 2021 Elsevier B.V. All rights reserved.