An insight into the influence of morphological and compositional heterogeneity of an individual intermetallic particle on aluminium alloy corrosion initiation
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
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.
aluminium alloys, atomic force microscopy, intermetallic particle, localized corrosion, scanning electrochemical microscopy, scanning electron microscopy
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-120547DOI: 10.1002/maco.201106466ISI: 000316272200005ScopusID: 2-s2.0-84875267267OAI: oai:DiVA.org:kth-120547DiVA: diva2:615797
QC 201304122013-04-122013-04-112013-04-12Bibliographically approved