Corrosion inhibition of aluminium alloy AA6063-T5 by vanadates: Local surface chemical events elucidated by confocal Raman micro-spectroscopyShow others and affiliations
2019 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, 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
2019. Vol. 148, p. 237-250
Keywords [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
National Category
Natural Sciences
Identifiers
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
Note
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;
2019-01-172019-01-172020-06-29Bibliographically approved