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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Multiscale Electrochemical Study of Welded Al Alloys Joined by Friction Stir Welding

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Author(s):
de Abreu, Caio Palumbo [1, 2] ; Costa, Isolda [1] ; de Melo, Hercilio Gomes [3] ; Pebere, Nadine [4] ; Tribollet, Bernard [2] ; Vivier, Vincent [2]
Total Authors: 6
Affiliation:
[1] Ctr Ciencia & Tecnol Mat, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Paris 06, CNRS, Lab Interfaces & Syst Electrochim, UPR 15, CP 133, F-75252 Paris 05 - France
[3] Univ Sao Paulo, Dept Eng Met & Mat, BR-05508030 Sao Paulo, SP - Brazil
[4] Univ Toulouse, CIRIMAT, CNRS, UPS, INPT, ENSIACET, BP 44362, F-31432 Toulouse 04 - France
Total Affiliations: 4
Document type: Journal article
Source: Journal of the Electrochemical Society; v. 164, n. 13, p. C735-C746, 2017.
Web of Science Citations: 2
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. (c) 2017 The Electrochemical Society. All rights reserved. (AU)

FAPESP's process: 13/13235-6 - Investigation on the localized corrosion and the fatigue corrosion resistance of high strength aluminum alloys joined by friction stir welding (FSW)
Grantee:Isolda Costa
Support Opportunities: Research Projects - Thematic Grants