Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 842, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155825
Keywords
High entropy alloy (HEA); Potentiodynamic-polarization; Corrosion; Rare-earth; Passivity; XPS
Categories
Funding
- Natural Science Foundation of Shanxi Province, China [201901D111105, 201901D111114]
- Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi
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The effect of minor inclusion of rare earth element of lanthanum into a well-established high entropy alloy system of CrMnFeNi on their corrosion resistance properties in different media with various concentrations was investigated in this study. The potentiodynamic polarization curves of the CrMnFeNi and CrMnFeNiLa0.1 alloys in acidic solutions exhibit an extensive passive region (Delta E>1100 mV). The Nyquist plot of the La-free CrMnFeNi alloy includes one capacitive loop and one inductive loop and while for the CrMnFeNiLa0.1 alloy only one capacitive loop is present. SEM results show that the morphology of the two alloys is obviously different in different media. XPS data reveals the existence of distinctive content discrepancy of Mn and Ni in passive film between La free and La-containing HEA, strongly implying the considerable impact of La in the passivation process. (C) 2020 Elsevier B.V. All rights reserved.
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