Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 265, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2021.124509
Keywords
High entropy alloys (HEAs); Rare earth; Mott-Schottky plot; Electrochemical impedance spectroscopy (EIS); XPS
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Funding
- Natural Science Foundation of Shanxi Province, China [201901D111105, 201901D111114]
- Transformation of Scientific, Technological Achievements Programs of Higher Education Institutions in Shanxi
- State Key Lab of Advanced Metals and Materials of China [2020-Z09]
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The passivity of CrMnFeNi and CrMnFeNiLa0.1 high entropy alloys in 0.5 M H2SO4 solution was investigated. CrMnFeNiLa0.1 exhibited better corrosion resistance and semiconducting properties compared to CrMnFeNi. XPS results indicated that La-containing alloys have more oxidized states of Cr and bound water.
The passivity of CrMnFeNi and CrMnFeNiLa0.1 high entropy alloys (HEAs) in 0.5 M H2SO4 solution had been investigated by immersion test, Mott-Schottky analysis, electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). Potentiodynamic polarization and immersion tests demonstrate that CrMnFeNiLa0.1 exhibited better overall corrosion resistance than that of CrMnFeNi. Semiconducting properties of both HEAs were identified by Mott-Schottky analysis. XPS results indicated that more oxidized states of Cr and bound water are present in La-containing HEAs. Overall results suggest that the inclusion of La has a substantial impact on the passivation process of these HEAs.
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