Synthesis and Electrochemical Corrosion Behaviour of High Entropy Alloys

• Published in: Transactions of the Indian Institute of Metals Vol. 77; no. 5; pp. 1249 - 1256
• Main Authors: Neeraj, Neeraj, Singh, Daljeet, Thakur, Lalit, Bajpai, Vijay Kumar, Kumar, Rajiv, Mehtani, Hitesh Kumar
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01-05-2024; Springer Nature B.V
• Subjects: Chemistry and Materials Science; Corrosion and Coatings; Corrosion effects; Corrosion resistance; Density; Electric arc furnaces; Electrochemical corrosion; Hardness; High entropy alloys; Inert atmospheres; Materials Science; Melting furnaces; Metallic Materials; Original Article; Sodium chloride; Sulfuric acid; Synthesis; Titanium; Titanium dioxide; Tribology; Vacuum arc melting; High entropy alloys; Potentiodynamic polarization; Electrochemical corrosion; Corrosion potential; Corrosion current density
• ISSN: 0972-2815; 0975-1645
• DOI: 10.1007/s12666-023-03076-z

High entropy alloys (HEAs) are alloys based on a minimum of five principal elements, which can also have some minor elements for improving the properties according to the applications. The present study deals with the minor elements (Al and Mn) containing CoCrFeNiTi-based HEAs and discusses the effect of Ti on the corrosion behaviour of the HEAs. The HEAs were synthesized in an inert atmosphere using a vacuum arc melting furnace. The as-synthesized HEA samples were characterized for microstructure, phases, hardness, and density. The hardness and density were influenced by changing the amount of Ti in HEAs. The electrochemical corrosion behaviour was analysed using a potentiostat in 3.5% NaCl and 0.1M H
2
SO
4
solutions. The corrosion results suggest that the high Ti-containing HEAs show better corrosion resistance in the NaCl and H
2
SO
4
solutions due to the formation of TiO
2
on the sample surface.