Journal
CORROSION SCIENCE
Volume 52, Issue 7, Pages 2489-2497Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.03.029
Keywords
Aluminium; Intermetallics; SEM; TEM; Anodic films; Oxide coatings
Funding
- EPSRC
- Engineering and Physical Sciences Research Council [EP/H020047/1, EP/D029201/1] Funding Source: researchfish
- EPSRC [EP/H020047/1] Funding Source: UKRI
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Several model second phase particles and a practical alloy (AA7075-T6) have been anodized in chromic and sulphuric acid to disclose the relation between particle composition, electrolyte nature and oxidation behaviour. Generally, magnesium-containing second phases are readily oxidized, because the presence of sufficient magnesium hinders the formation of a stable oxide, while copper- and iron-containing particles oxidize at reduced rates and support a relatively stable oxide. At low potential, in chromic acid, the oxidation rate of magnesium-containing particles is reduced, due to passivation induced by chromate anions. Conversely, for particles containing only copper and/or iron, chromate anions increase the oxidation rate. (C) 2010 Elsevier Ltd. All rights reserved.
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