Passivation behavior of VAlTiCrSi amorphous high-entropy alloy film with a high corrosion-resistance in artificial sea water

[Display omitted] •The complex HEAF composition results in its excellent corrosion-resistance.•The passive film was amorphous with ~10 nm thick single-layer structure.•The passive film consists of oxidation state and free state of V, Al, Ti, Cr and Si.•During rupturing of passive film, Cl- mainly re...

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Bibliographic Details
Published in:Applied surface science 2021-03, Vol.542, p.148520, Article 148520
Main Authors: Zheng, Shujing, Cai, Zhaobing, Pu, Jibin, Zeng, Chun, Wang, Liping
Format: Article
Language:English
Subjects:
Corrosion
High entropy alloy film
Passivation
TEM
XPS
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Summary:[Display omitted] •The complex HEAF composition results in its excellent corrosion-resistance.•The passive film was amorphous with ~10 nm thick single-layer structure.•The passive film consists of oxidation state and free state of V, Al, Ti, Cr and Si.•During rupturing of passive film, Cl- mainly react with Cr leading to pitting.•Other elements except Cr can resist the rupture of the passive film in some sense. The passivation behavior of a novel VAlTiCrSi amorphous high entropy alloy (HEA) film was investigated in artificial sea-water. The passive film, mainly composed of oxidation state of V, Al, Ti, Cr and Si, was a single-layer amorphous structure with a thickness of ~10 nm. By combining the point-defect model theory, the more excellent corrosion-resistance of HEA film than that of 304 stainless steel, is attributed to its complex composition. During the rupture process of the passive film, the Cl- mainly react with Cr element, and other elements except Cr work against the rupture process in some sense.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2020.148520