Effect of unequal levels of deformation and fragmentation on the electrochemical response of friction stir welded AA2024-T3 alloy

Author(s):Show less -

Queiroz, Fernanda Martins ^[1] ; Donatus, Uyime ^[2] ; Prada Ramirez, Oscar Mauricio ^[1] ; de Sousa Araujo, Joao Victor ^[2] ; Goncalves de Viveiros, Barbara Victoria ^[2] ; Lamaka, Sviatlana ^[3] ; Zheludkevich, Mikhail ^[3] ; Masoumi, Mohammad ^[4] ; Vivier, Vincent ^[5] ; Costa, Isolda ^[2] ; de Melo, Hercilio Gomes ^[1]

Affiliation

^[1] EPUSP, PMT, Dept Engn Met & Mat, Av Prof Mello Moraes 2463, Sao Paulo, SP - Brazil

^[2] IPEN, CCTM, Av Prof Lineu Prestes 2242, Sao Paulo, SP - Brazil

^[3] HZG, MagIC, Inst Mat Res, Magnesium Innovat Ctr, Max Planck Str 1, D-21502 Geesthacht - Germany

^[4] Univ Fed ABC, UFABC, CECS, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, Ave Estados 5001, Santo Andre, SP - Brazil

^[5] Sorbonne Univ, CNRS, F-75005 Paris - France

• Document type: Journal article
• Source: Electrochimica Acta; v. 313, p. 271-281, AUG 1 2019.
• Web of Science Citations: 1

Abstract

The effect of unequal levels of deformation and fragmentation on the electrochemical response of friction stir welded AA2024-T3 has been investigated using electron backscatter diffraction, scanning electron microscopy, global and localized electrochemical techniques. The friction stir welding process introduced unequal distribution and fragmentation of coarse intermetallic particles, such that more clusters of these particles were present in the thermomechanically affected zone of the weld. This resulted in a higher susceptibility to severe localized corrosion in this region when compared with the others. Results from electrochemical measurements using a microcell could not be clearly correlated with the corrosion behaviour because no significant differences were observed using these techniques. On the other hand, LEIS and SVET results were in agreement and correlated with the corrosion evolution at the surfaces of the tested samples. (C) 2019 Elsevier Ltd. 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
• FAPESP's process: 17/03095-3 - Investigation on corrosion susceptibility of Al-Cu-Li alloys by friction stir welding (FSW) through scanning vibrating electrode technique (SVET)
• Grantee: Uyime Donatus
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 16/20572-7 - Using localized electrochemical impedance spectroscopy (LEIS) for corrosion of high mechanical strength aluminum alloys welded by FSW
• Grantee: Fernanda Martins Queiroz
• Support Opportunities: Scholarships in Brazil - Post-Doctoral