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Anodisation of aluminium alloy AA7075 – Influence of intermetallic particles on anodic oxide growth
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0001-5180-9895
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
2020 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 164, article id 108319Article in journal (Refereed) Published
Abstract [en]

Microstructure and Volta-potential analyses were conducted to characterise intermetallic-particles (IMPs) in AA7075-T5. EIS and AFM were applied under operando-conditions to investigate anodisation processes. IMPs have pronounced influence on the growth of anodic aluminium oxide (AAO) films resulting in low charge-transfer resistance. Cu-bearing constituents show cathodic-character, whereas Mg2Si and MgZn2 particles show anodic-character. During anodisation, Al7Cu2Fe remain stable with peripheral-dissolution around boundary. De-alloying of S-phase particles leads to the detachment. Mg2Si undergoes de-alloying at low potential, and re-passivation at high potential. MgZn2 dissolves entirely upon anodization. Localised-dissolution in large-IMPs boundaries or nanometre-sized IMPs facilitates bubble evolution, confirming local breakdown of barrier-layer.

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 164, article id 108319
Keywords [en]
Anodization, In-situ EC-AFM, Intermetallic particles, Localised dissolution, Operando EIS, SKPFM, Alloying, Alumina, Aluminum alloys, Aluminum oxide, Anodic oxidation, Binary alloys, Charge transfer, Dealloying, Dissolution, Intermetallics, Iron alloys, Oxide films, Silicon alloys, Ternary alloys, Anodizations, Inter-metallic particle, Localised, Operando, Magnesium alloys
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-268382DOI: 10.1016/j.corsci.2019.108319ISI: 000515204200017Scopus ID: 2-s2.0-85075390610OAI: oai:DiVA.org:kth-268382DiVA, id: diva2:1426138
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QC 20200423

Available from: 2020-04-23 Created: 2020-04-23 Last updated: 2020-04-23Bibliographically approved

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Zhang, FanÖrnek, Cem

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