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Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
RISE Res Inst Sweden, Surface Proc & Formulat, SE-11486 Stockholm, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
Gdansk Univ Technol, Dept Electrochem Corros & Mat Engn, 11-12 Narutowicza St, PL-80233 Gdansk, Poland..
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2019 (English)In: CORROSION SCIENCE, Vol. 148, p. 237-250Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 148, p. 237-250
Keywords [en]
Aluminium, Alloy, Raman spectroscopy, SEM, XPS, Vanadate inhibitor
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-244484DOI: 10.1016/j.corsci.2018.12.011ISI: 000457950400023Scopus ID: 2-s2.0-85059158841OAI: oai:DiVA.org:kth-244484DiVA, id: diva2:1298053
Note

QC 20190321

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-04-04Bibliographically approved

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Örnek, CemClaesson, Per M.Pan, Jinshan

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Kharitonov, Dmitry S.Örnek, CemClaesson, Per M.Pan, Jinshan
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School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH)Surface and Corrosion ScienceMaterials Science and Engineering
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