Corrosion behavior of AlCrVTi light-weight high-entropy alloy coating in different corrosion environments

Abstract

The excellent corrosion resistance of high-entropy alloys (HEAs) has attracted widespread attention in recent years. The focus of research is gradually shifting from the performance characterization to the composition design and application that balance multiple performance. In this study, the AlCrVTi light-weight HEA has been chosen to investigate the corrosion behavior in the electrochemical and salt spray environment. The results show that HEA coating prepared by plasma spray followed laser re-melting present a homogeneous single-phase microstructure. The active Ti and V elements promote the formation of passive film during corrosion, which improves the corrosion resistance of HEA coating. Therefore, the HEA presents a higher corrosion resistance compared with 304 stainless steel (SS304), which is reflected in the lower corrosion current density. In the salt spray environment, the coating still presents the pitting corrosion, which is same as in the electrochemical environments. It is demonstrated that the AlCrVTi HEA has the potential that balancing the corrosion resistance and mechanical properties.