Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy

Dmitry S. Kharitonov; Jens Sommertune; Cem Örnek; Jacek Ryl; Irina I. Kurilo; Per M. Claesson; Jinshan Pan

doi:10.1016/j.corsci.2018.12.011

Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy

Dmitry S. Kharitonov^*, Jens Sommertune, Cem Örnek, Jacek Ryl, Irina I. Kurilo, Per M. Claesson, Jinshan Pan

^*Corresponding author for this work

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

54 Citations (Scopus)

Abstract

Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V⁺⁴ and V⁺⁵ polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V⁺⁵ species are first reduced to V⁺⁴ or V⁺³ species above cathodic IMPs, and then oxidized to mixed-valence V⁺⁵/V⁺⁴ polymerized compounds.

Original language	English
Pages (from-to)	237-250
Number of pages	14
Journal	Corrosion Science
Volume	148
DOIs	https://doi.org/10.1016/j.corsci.2018.12.011
Publication status	Published - Mar 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd

Keywords

A. Alloy
A. Aluminium
B. Raman spectroscopy
B. SEM
B. XPS
C. Vanadate inhibitor

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10.1016/j.corsci.2018.12.011

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@article{7f99f19ffa024e4291b033c9f0a14b71,

title = "Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy",

abstract = "Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V+4 and V+5 polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V+5 species are first reduced to V+4 or V+3 species above cathodic IMPs, and then oxidized to mixed-valence V+5/V+4 polymerized compounds.",

keywords = "A. Alloy, A. Aluminium, B. Raman spectroscopy, B. SEM, B. XPS, C. Vanadate inhibitor",

author = "Kharitonov, \{Dmitry S.\} and Jens Sommertune and Cem {\"O}rnek and Jacek Ryl and Kurilo, \{Irina I.\} and Claesson, \{Per M.\} and Jinshan Pan",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2019",

month = mar,

doi = "10.1016/j.corsci.2018.12.011",

language = "English",

volume = "148",

pages = "237--250",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd",

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TY - JOUR

T1 - Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates

T2 - Local surface chemical events elucidated by confocal Raman micro-spectroscopy

AU - Kharitonov, Dmitry S.

AU - Sommertune, Jens

AU - Örnek, Cem

AU - Ryl, Jacek

AU - Kurilo, Irina I.

AU - Claesson, Per M.

AU - Pan, Jinshan

PY - 2019/3

Y1 - 2019/3

N2 - Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V+4 and V+5 polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V+5 species are first reduced to V+4 or V+3 species above cathodic IMPs, and then oxidized to mixed-valence V+5/V+4 polymerized compounds.

AB - Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V+4 and V+5 polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V+5 species are first reduced to V+4 or V+3 species above cathodic IMPs, and then oxidized to mixed-valence V+5/V+4 polymerized compounds.

KW - A. Alloy

KW - A. Aluminium

KW - B. Raman spectroscopy

KW - B. SEM

KW - B. XPS

KW - C. Vanadate inhibitor

UR - https://www.scopus.com/pages/publications/85059158841

U2 - 10.1016/j.corsci.2018.12.011

DO - 10.1016/j.corsci.2018.12.011

M3 - Article

AN - SCOPUS:85059158841

SN - 0010-938X

VL - 148

SP - 237

EP - 250

JO - Corrosion Science

JF - Corrosion Science

ER -

Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy

Abstract

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Keywords

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