期刊
CORROSION SCIENCE
卷 148, 期 -, 页码 237-250出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.12.011
关键词
Aluminium; Alloy; Raman spectroscopy; SEM; XPS; Vanadate inhibitor
资金
- Ministry of Education of the Republic of Belarus [20161135]
- Swedish Institute (Visby programme PhD scholarship)
- Swedish Foundation for Strategic Research (SSF) [RMA11-0090]
- Knut and Alice Wallenberg Foundation
- Polish Ministry of Science and Higher Education from the budget funds in the period 2016-2019 under Iuventus Plus project [IP2015067574]
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.
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