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Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopy
KTH Royal Institute of Technology, Sweden; Belarusian State Technological University, Belarus.
RISE - Research Institutes of Sweden, Biovetenskap och material, Yta, process och formulering.ORCID-id: 0000-0002-4697-9192
KTH Royal Institute of Technology, Sweden.ORCID-id: 0000-0002-3029-6493
Gdansk University of Technology, Poland.
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2019 (Engelska)Ingår i: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 148, s. 237-250Artikel i tidskrift (Refereegranskat) 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. 

Ort, förlag, år, upplaga, sidor
2019. Vol. 148, s. 237-250
Nyckelord [en]
A. Alloy, A. Aluminium, B. Raman spectroscopy, B. SEM, B. XPS, C. Vanadate inhibitor, Corrosion inhibitors, Electrolytic reduction, Sodium alloys, Sodium chloride, Transition metal compounds, Vanadium alloys, X ray photoelectron spectroscopy, Chemical interactions, Corrosion inhibition, Local surfaces, Mechanism of corrosion, Oxygen reduction kinetics, Two-step mechanisms, Vanadium species, Aluminum corrosion
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URN: urn:nbn:se:ri:diva-37038DOI: 10.1016/j.corsci.2018.12.011Scopus ID: 2-s2.0-85059158841OAI: oai:DiVA.org:ri-37038DiVA, id: diva2:1280051
Anmärkning

 Funding details: Belarusian State University, BSU; Funding details: IP2015067574; Funding details: Ministry of Education of the Republic of Belarus, 20161135; Funding details: Stiftelsen för Strategisk Forskning; Funding details: Kungliga Tekniska Högskolan, KTH; Funding details: Sjögren’s Syndrome Foundation, RMA11-0090; Funding details: Knut och Alice Wallenbergs Stiftelse;

Tillgänglig från: 2019-01-17 Skapad: 2019-01-17 Senast uppdaterad: 2019-06-28Bibliografiskt granskad

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Sommertune, JensÖrnek, Cem

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