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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.)

On the local corrosion behavior of coupled welded zones of the 2098-T351 Al-Cu-Li alloy produced by Friction Stir Welding (FSW): An amperometric and potentiometric microelectrochemical investigation

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da Silva, Rejane Maria P. [1, 2] ; Izquierdo, Javier [2, 3] ; Milagre, Mariana X. [1] ; Betancor-Abreu, Abenchara Maria [2] ; de Oliveira, Leandro A. [4] ; Antunes, Renato A. [4] ; Souto, Ricardo M. [2, 3] ; Costa, Isolda [1]
Total Authors: 8
[1] Inst Pesquisas Energet & Nucl IPEN CNEN, Av Prof Lineu Prestes 2242, Sao Paulo - Brazil
[2] Univ La Laguna, Dept Chem, POB 456, E-38200 San Cristobal la Laguna, Tenerife - Spain
[3] Univ La Laguna, Inst Mat Sci & Nanotechnol, POB 456, E-38200 San Cristobal la Laguna, Tenerife - Spain
[4] Univ Fed ABC UFABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas C, Av Estados 5001, BR-09210580 Santo Andre, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Electrochimica Acta; v. 373, MAR 20 2021.
Web of Science Citations: 0

Localized electrochemical methods supported by surface analytical characterizations were employed to investigate galvanic coupling effects and local electrochemical activity developed along the welded zones in Friction Stir Welded 2098-T351 Al-Cu-Li alloy. The investigation was carried out in the coupled weld joint/heat affected zones (WJ/HAZ) for both, the retreating (RS) and the advancing (AS) sides. The correlation between the surface chemistry, the microstructural characteristics and the electrochemical activity of these welded areas was studied. The results showed the development of galvanic interactions within and between the WJ and HAZ regions, which were imaged using the scanning vibrating electrode technique (SVET), and scanning electrochemical microscopy (SECM). SVET analyses showed that HAZ was more susceptible to the development of anodic sites than WJ. SECM in amperometric operation mode showed that WJ coupled to HAZ exhibited higher oxygen consumption and higher cathodic activity compared to HAZ. Furthermore, SECM in potentiometric operation showed alkalinization around WJ and increased acidity in HAZ, mainly at sites of severe localized corrosion (SLC). Based on the SVET and SECM results in combination with the surface analyses, it is proposed that the microgalvanic cells formed within these welded zones are due to the presence of secondary phases in the 2098-T351 alloy and their interactions with the adjacent matrix. (c) 2021 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 19/11427-1 - Micro-electrochemical techniques to study the localized corrosion in Al-Cu-Li alloys joined by friction stir welding (FSW).
Grantee:Rejane Maria Pereira da Silva
Support type: Scholarships abroad - Research Internship - Post-doctor
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 type: Research Projects - Thematic Grants
FAPESP's process: 18/06880-6 - Use of Localized Electrochemical Techniques for the Study of Corrosion of of High Strength Aluminum Alloys Joined by Friction (FSW).
Grantee:Rejane Maria Pereira da Silva
Support type: Scholarships in Brazil - Post-Doctorate