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Multiscale electrochemical study of welded al alloys joined by friction stir welding

De Abreu, Caio Palumbo and Costa, Isolda and De Melo, Hercílio Gomes and Pébère, Nadine and Tribollet, Bernard and Vivier, Vincent Multiscale electrochemical study of welded al alloys joined by friction stir welding. (2017) Journal of The Electrochemical Society (JES), 164 (13). C735-C746. ISSN 0013-4651

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Official URL: http://dx.doi.org/10.1149/2.0391713jes

Abstract

Friction stir welding (FSW) is an efficient way to join high strength aluminum alloys. However, FSW generates different microstructural areas in contact that may give rise to galvanic couplings, affecting the corrosion resistance of the assembly. In the present work, a multiscale electrochemical study of the 7475-T651 and 2024-T3 aluminum alloys butt-joined by FSW was carried out.Much lower impedances were associated with the FSW affected zones compared to the two aluminum base metals tested individually. Corrosion of the welded system resulted in the establishment of galvanic coupling, shown by local electrochemical impedance spectroscopy (LEIS) measurements, at which the AA7475 behaves anodically with respect to the AA2024. A Zn deposit was observed on the intermetallic particles of the AA2024 after 24 h of immersion in the electrolyte resulting from the galvanic coupling, which seems to reduce the galvanic coupling effects. Such a behavior in combination with LEIS results allowed a description of the galvanic coupling development between two different aluminum alloys (AA2024-T3 and AA7475-T761) butt-welded by FSW as a function of time from the early stage of immersion.

Item Type:Article
Additional Information:Thanks to ECS editor. The original PDF of the article can be found at http://jes.ecsdl.org/content/164/13/C735
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Centro de Ciência e Tecnologia de Materiais - CCTM (IPEN) (BRAZIL)
Other partners > Universidade de São Paulo - USP (BRAZIL)
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Deposited By: cirimat webmestre
Deposited On:27 Apr 2018 13:24

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