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An insight into the influence of morphological and compositional heterogeneity of an individual intermetallic particle on aluminium alloy corrosion initiation
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-4431-0671
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-9453-1333
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2013 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 64, no 3, 195-198 p.Article in journal (Refereed) Published
Abstract [en]

In this work, a multi-analytical in situ and ex situ approach was used to provide information needed to identify the role of an individual heterogeneous intermetallic particle (IMP) in localized corrosion initiation of aluminium alloys. The heterogeneity of the IMP was studied by combining atomic force microscopy (AFM), scanning electron microscopy and energy dispersive spectroscopy (SEMEDS) and scanning electrochemical microscopy (SECM). A complex AlMnFeSi IMP phase with different chemical composition in its inner and outer parts was characterized by SEMEDS analysis. AFM results uniquely revealed a brain-like feature of an IMP with 20nm height variations. Submicron sized galvanic cell induced by morphological and compositional heterogeneity resulted in a localized corrosion attack inside the individual IMP. Various collected current levels measured by SECM were associated to the morphological and compositional heterogeneity of IMPs.

Place, publisher, year, edition, pages
2013. Vol. 64, no 3, 195-198 p.
Keyword [en]
aluminium alloys, atomic force microscopy, intermetallic particle, localized corrosion, scanning electrochemical microscopy, scanning electron microscopy
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-120547DOI: 10.1002/maco.201106466ISI: 000316272200005Scopus ID: 2-s2.0-84875267267OAI: oai:DiVA.org:kth-120547DiVA: diva2:615797
Note

QC 20130412

Available from: 2013-04-12 Created: 2013-04-11 Last updated: 2017-12-06Bibliographically approved

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Pan, JinshanLeygraf, Christofer

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