Establishing a correlation between interfacial microstructures and corrosion initiation sites in Al/Cu joints by SEM–EDS and AFM–SKPFM

Sarvghad-Moghaddam, Madjid, Parvizi, Reza, Davoodi, Ali, Haddad-Sabzevar, Mohsen, & Imani, Amin (2014) Establishing a correlation between interfacial microstructures and corrosion initiation sites in Al/Cu joints by SEM–EDS and AFM–SKPFM. Corrosion Science, 79, pp. 148-158.

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Abstract

A lap joint of AA3003 and pure copper was produced by friction stir welding and the induced interfaces were investigated. Interfacial regions were characterized by SEM–EDS, AFM, SKPFM, OM and Vickers micro-hardness. Multimodal Gaussian distribution (for characterization of surface potential patterns) showed the formation of multiple compounds. A quantitative correlation between microstructure constituents and Volta potential distribution was recognized and confirmed by corrosion attacked sites observations. It was observed that the Al-rich regions proximate the dispersed Cu particles and Cu–Al intermetallics were most susceptible to corrosion attack initiation due to a galvanic driving force between these surface constituents.

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12 citations in Scopus
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12 citations in Web of Science®

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ID Code: 95930
Item Type: Journal Article
Refereed: Yes
Keywords: Intermetallics, AFM, SEM, Interfaces, Pitting corrosion, Welding
DOI: 10.1016/j.corsci.2013.10.039
ISSN: 0010-938X
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier Ltd.
Copyright Statement: This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Deposited On: 03 Jun 2016 01:16
Last Modified: 09 Jun 2016 00:42

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