Potentiostat

Oxide

High entropy alloys

Electrochemistry

Metallurgy

Materials science

Layer (electronics)

Physical chemistry

Chloride

Alloy

Microstructure

Composite material

Corrosion

Chemistry

Electrode

Passivation

Corrosion Science

The corrosion properties in NaCl solution of four equiatomic HEAs of the CoCrFeNi system adding Al, Cu and Sn are investigated. These alloys are processed by vacuum arc melting and assessed via the Potentiostat method. The properties were compared with two standard stainless steels. The results indicate that CoCrFeNiSn possesses the best passivation in this solution, explained by the alloy phases and presence at the surface of elements in oxidation states corresponding to stable oxide films. The other systems show a range of behaviours attributable to their different microstructures and varying potential for stable oxide formation.

The corrosion behaviour of CoCrFeNi-x (x = Cu, Al, Sn) high entropy alloy systems in chloride solution