RT info:eu-repo/semantics/article
T1 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
A1 Souto, Ricardo Manuel
A1 Da Silva, Rejane Maria P.
A1 Izquierdo Pérez, Javier
A1 Milagre, Mariana X.
A1 Betancor-Abreu, A.
A1 De Oliveira, Leandro A.
A1 Antunes, Renato A.
A1 Costa, Isolda
A2 Química
A2 Proyecto CTQ2016-80522-P
Grupo de Electroquímica y CorrosiónInstituto de Materiales y Nanotecnología
K1 Al-Cu-Li alloys
K1 Friction stir welding
K1 galvanic coupling effects
K1 Local electrochemical activity
K1 SVET
K1 SECM
AB The galvanic coupling effects and the local electrochemical activity developed along the welded zones in FSWelded 2098-T351 Al-Cu-Li alloy have been investigated using localized electrochemical methods supported by surface analytical characterizations. The investigation was carried out in the coupled welding joint/heat affected zones (WJ/HAZ) for both the retreating (RS) and the advancing (AS) sides. The correlation between surface chemistry, microstructural features and electrochemical activity of these welded zones has been studied. The results showed the development of galvanic interactions within and between the WJ and the HAZ regions that were visualized using the Scanning vibrating electrode technique (SVET) and scanning electrochemical microscopy (SECM). SVET analyses showed that the HAZ was more susceptible to the development of anodic sites compared to WJ. SECM in amperometric operation mode showed that the WJ coupled to HAZ presented higher oxygen consumption and greater cathodic activity compared to HAZ. Furthermore, SECM in the potentiometric operation mode showed alkalization on the WJ and increased acidity on the HAZ, mainly at severe localized corrosion (SLC) sites. Based on SVET and SECM results in combination surface analysis, it is proposed that the micro-galvanic cells formedwithin these welded zones are due to the presence of secondary phases in the 2098-T351 alloy and their interactions with the adjacent matrix.
YR 2021
FD 2021
LK http://riull.ull.es/xmlui/handle/915/22285
UL http://riull.ull.es/xmlui/handle/915/22285
LA en
NO Electrochimica Acta 373 (2021) 137910, 12 pp.https://doi.org/10.1016/j.electacta.2021.137910.
DS Repositorio institucional de la Universidad de La Laguna
RD 13-nov-2024