Study of the surface oxides and corrosion behaviour of an equiatomic CoCrFeMnNi high entropy alloy by XPS and ToF-SIMS

•Surface oxide layers formed on CoCrFeMnNi High Entropy Alloy are investigated by XPS and ToF-SIMS.•An XPS methodology based on analysis of the 3p core level spectra was developed.•The native oxide and passive films are compared.•The oxide film on HEA is duplex comprising a Cr/Mn inner oxide layer a...

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