Element-resolved electrochemical analysis of transpassive dissolution and repassivation behavior of the multi-principle element alloy AlTiVCr

S. Choudhary; Y. Qiu; S. Thomas; N. Birbilis

doi:10.1016/j.electacta.2020.137104

Element-resolved electrochemical analysis of transpassive dissolution and repassivation behavior of the multi-principle element alloy AlTiVCr

S. Choudhary^*, Y. Qiu, S. Thomas, N. Birbilis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

The dissolution and subsequent repassivation behavior of a lightweight and single-phase multi-principle element alloy (MPEA) AlTiVCr, have been investigated in a quiescent 0.6 M NaCl. The alloy exhibits excellent passivity and repassivation ability in spite of transpassive dissolution of V and Cr during cyclic potentiodynamic polarisation. Elemental-resolved dissolution analysis of the alloy using inline inductively coupled plasma mass spectroscopy (ICP-MS), together with composition analysis of the passive film using X-ray photoelectron spectroscopy (XPS) reveal that the alloy promptly recovers after each transpassive dissolution due to rapid growth of stable TiO₂ in the film, which led to a wide passive window. Moreover, the excellent repassivation behavior was found to be due to significant enrichment of Ti on the alloy surface during anodic polarisation. The results, corresponding to the dissolution and compositional evolution of the passive film, were in good agreement with the predicted E-pH diagram of the alloy.

Original language	English
Article number	137104
Journal	Electrochimica Acta
Volume	362
DOIs	https://doi.org/10.1016/j.electacta.2020.137104
Publication status	Published - 1 Dec 2020

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10.1016/j.electacta.2020.137104

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title = "Element-resolved electrochemical analysis of transpassive dissolution and repassivation behavior of the multi-principle element alloy AlTiVCr",

abstract = "The dissolution and subsequent repassivation behavior of a lightweight and single-phase multi-principle element alloy (MPEA) AlTiVCr, have been investigated in a quiescent 0.6 M NaCl. The alloy exhibits excellent passivity and repassivation ability in spite of transpassive dissolution of V and Cr during cyclic potentiodynamic polarisation. Elemental-resolved dissolution analysis of the alloy using inline inductively coupled plasma mass spectroscopy (ICP-MS), together with composition analysis of the passive film using X-ray photoelectron spectroscopy (XPS) reveal that the alloy promptly recovers after each transpassive dissolution due to rapid growth of stable TiO2 in the film, which led to a wide passive window. Moreover, the excellent repassivation behavior was found to be due to significant enrichment of Ti on the alloy surface during anodic polarisation. The results, corresponding to the dissolution and compositional evolution of the passive film, were in good agreement with the predicted E-pH diagram of the alloy.",

keywords = "AESEC, MPEA, Repassivation, Transpassive dissolution, XPS",

author = "S. Choudhary and Y. Qiu and S. Thomas and N. Birbilis",

note = "Publisher Copyright: {\textcopyright} 2020",

year = "2020",

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doi = "10.1016/j.electacta.2020.137104",

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T1 - Element-resolved electrochemical analysis of transpassive dissolution and repassivation behavior of the multi-principle element alloy AlTiVCr

AU - Choudhary, S.

AU - Qiu, Y.

AU - Thomas, S.

AU - Birbilis, N.

PY - 2020/12/1

Y1 - 2020/12/1

N2 - The dissolution and subsequent repassivation behavior of a lightweight and single-phase multi-principle element alloy (MPEA) AlTiVCr, have been investigated in a quiescent 0.6 M NaCl. The alloy exhibits excellent passivity and repassivation ability in spite of transpassive dissolution of V and Cr during cyclic potentiodynamic polarisation. Elemental-resolved dissolution analysis of the alloy using inline inductively coupled plasma mass spectroscopy (ICP-MS), together with composition analysis of the passive film using X-ray photoelectron spectroscopy (XPS) reveal that the alloy promptly recovers after each transpassive dissolution due to rapid growth of stable TiO2 in the film, which led to a wide passive window. Moreover, the excellent repassivation behavior was found to be due to significant enrichment of Ti on the alloy surface during anodic polarisation. The results, corresponding to the dissolution and compositional evolution of the passive film, were in good agreement with the predicted E-pH diagram of the alloy.

AB - The dissolution and subsequent repassivation behavior of a lightweight and single-phase multi-principle element alloy (MPEA) AlTiVCr, have been investigated in a quiescent 0.6 M NaCl. The alloy exhibits excellent passivity and repassivation ability in spite of transpassive dissolution of V and Cr during cyclic potentiodynamic polarisation. Elemental-resolved dissolution analysis of the alloy using inline inductively coupled plasma mass spectroscopy (ICP-MS), together with composition analysis of the passive film using X-ray photoelectron spectroscopy (XPS) reveal that the alloy promptly recovers after each transpassive dissolution due to rapid growth of stable TiO2 in the film, which led to a wide passive window. Moreover, the excellent repassivation behavior was found to be due to significant enrichment of Ti on the alloy surface during anodic polarisation. The results, corresponding to the dissolution and compositional evolution of the passive film, were in good agreement with the predicted E-pH diagram of the alloy.

KW - AESEC

KW - MPEA

KW - Repassivation

KW - Transpassive dissolution

KW - XPS

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U2 - 10.1016/j.electacta.2020.137104

DO - 10.1016/j.electacta.2020.137104

M3 - Article

SN - 0013-4686

VL - 362

JO - Electrochimica Acta

JF - Electrochimica Acta

M1 - 137104

ER -

Element-resolved electrochemical analysis of transpassive dissolution and repassivation behavior of the multi-principle element alloy AlTiVCr

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