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dc.contributor.authorKumari, Shilpa
dc.contributor.authorWenner, Sigurd
dc.contributor.authorWalmsley, John
dc.contributor.authorLunder, Otto
dc.contributor.authorNisancioglu, Kemal
dc.identifier.citationJournal of the Electrochemical Society. 2019, 166 3114-3123.nb_NO
dc.description.abstractAs part of an extensive research program to study recent, unexpected intergranular corrosion (IGC) on 6xxx series aluminum alloys (AlMgSi), this paper investigates the mechanism of initiation and early propagation of IGC on the extruded AA6005-T5 alloy with small Cu content (0.1 wt%) by use of advanced electron microscopy techniques applied for near surface characterization. Corrosion testing was restricted to the accelerated IGC test according to the standard BS ISO 11846, involving exposure to acidified chloride solution. The effect of modifying the as-received extruded surface by metallographic polishing, argon sputtering, and alkaline etching was investigated. Initiation of IGC was delayed on the as-received surface compared to the modified surface, caused by the presence of an approximately 8 nm thick crystalline oxide layer formed during extrusion. IGC initiated at the primary α-Al(Fe,Cu,Mn)Si particles for all types of surfaces. However, these particles corroded rapidly in the test solution forming a residue of Cu and Si on the exposed particle surface. This phenomenon, as well as enrichment of Cu on the Al matrix surface by dealloying, contributed increasingly to the formation of new effective cathodic sites and continuing propagation of IGC. The AlMgSiCu (Q) phase, present as primary and secondary particles, was relatively inert against both oxidation and reduction.nb_NO
dc.publisherThe Electrochemical Societynb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectSurface sciencenb_NO
dc.subjectElectron microscopynb_NO
dc.subjectGrain boundariesnb_NO
dc.titleProgress in Understanding Initiation of Intergranular Corrosion on AA6005 Aluminum Alloy with Low Copper Contentnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.rights.holder© The Author(s) 2019. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY,, which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.nb_NO
dc.source.journalJournal of the Electrochemical Societynb_NO
dc.relation.projectNorges forskningsråd: 247598nb_NO
cristin.unitnameMaterialer og nanoteknologi

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