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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.)

How microstructure affects localized corrosion resistance of stir zone of the AA2198-T8 alloy after friction stir welding

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Author(s):
Carvalho Machado, Caruline de Souza [1] ; Donatus, Uyime [1] ; Milagre, Mariana Xavier [1] ; Araujo, Joao Victor de S. [1] ; de Viveiros, Barbara Victoria G. [1] ; Klumpp, Rafael Emil [1] ; Pereira, Victor Ferrinho [2] ; Costa, Isolda [1]
Total Authors: 8
Affiliation:
[1] Inst Pesquisas Energet & Nucl IPEN CNEN, Av Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP - Brazil
[2] Brazilian Nanotechnol Natl Lab CNPEM, R Giuseppe Maximo Scolfaro 10000, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: MATERIALS CHARACTERIZATION; v. 174, APR 2021.
Web of Science Citations: 0
Abstract

In this study, the microstructure and corrosion resistance of the stir zone (SZ) of the AA2198-T8 Al-Cu-Li alloy welded by friction stir welding (FSW) were investigated by microscopy, immersion tests and electrochemical techniques such as measurements of open circuit potential variation with time, and scanning vibrating electrode technique (SVET) measurements. A low chloride-containing solution (0.005 mol L-1 NaCl) was employed in the corrosion studies and severe localized corrosion (SLC) was observed in the SZ related to intergranular attack. The results were compared to those of the non-affected areas by FSW, also known as base metal (BM). In the BM, SLC was found and the type of attack related to it was intragranular. In both zones, BM and SZ, SLC was due to precipitates of high electrochemical activity, specifically T1 (Al2CuLi) phase in the BM, whereas TB (Al7Cu4Li) / T2 (Al6CuLi3) in the SZ. Scanning vibrating electrode technique (SVET) analysis was very useful in the study of SLC in the AA2198-T8 alloy showing the development of high anodic current densities at the mouth of the SLC sites. (AU)

FAPESP's process: 19/18388-1 - Effect of the microstructure of high strength Al alloys on formation and corrosion resistance of the anodized layer
Grantee:João Victor de Sousa Araujo
Support Opportunities: Scholarships in Brazil - Doctorate
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