Electrochemical Study of MoTaNbVTi High Entropy Alloy in Aqueous Environments

Abstract

The purpose of this study is to investigate the corrosion behavior of MoTaNbVTi refractory high entropy alloy in 3.5 wt.% NaCl and Hank solution. Regarding the sea water testing environment, data from the electrochemical analysis of the polarization curves created some first suspicions about a local corrosion tendency. However, the corroded surfaces and crosssections' Scanning Electron Microscopy and Energy Dispersive Spectroscopy analysis verified no signs of any type of degradation. Moreover, the results indicate that no selective corrosion along the inter-dendritic regions of the alloy, was found. As far as the Hank solution is concerned, once again, some preliminary considerations of a possible susceptibility to local forms of corrosion were shown off, however, no evidence of corrosion signs (either pericrystalline or pitting) was detected. The findings of this research suggest that MoTaNbVTi presented an excellent response to these types of corrosion environments and could be used as an ideal candidate for that kind of applications.