Welding and galvanic coupling effects on the electrochemical activity of dissimilar AA2050 and AA7050 aluminum alloys welded by Friction Stir Welding (FSW)
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In this work, the effects of friction stir welding (FSW) on the microstructure and electrochemical activities of
dissimilar AA2050 and AA7050 aluminum alloys have been investigated. Local electrochemical tests supported
by surface analytical characterization were used to study the local electrochemical activities developed along the
weld zones of the dissimilar alloys. The investigation was carried out on the cross-section of the welded Al alloys.
The results showed that the friction stir welding (FSW) of the dissimilar alloys affected the microstructure and
the electrochemical behavior of the different regions (HAZ, TMAZ, SZ) formed by the welding process. Scanning
vibrating electrode technique (SVET) and micropotentiometry by using an ion-selective microelectrode showed
that TMAZ was the zone with the highest electrochemical activity. This zone corresponded to the transition
region between the two welded alloys. The high electrochemical activity observed in this region was associated
with the effect of welding on the microstructure and, also, with the galvanic coupling between the two alloys,
where the alloy AA7050 acted as an anode and the AA2050 as a cathode. Preferential corrosion attack on the
AA7050 alloy was also evident.
Como referenciar
VIVEIROS, BARBARA V.G. de; SILVA, REJANE MARIA P. da; DONATUS, UYIME; COSTA, ISOLDA. Welding and galvanic coupling effects on the electrochemical activity of dissimilar AA2050 and AA7050 aluminum alloys welded by Friction Stir Welding (FSW). Electrochimica Acta, v. 449, p. 1-15, 2023. DOI: 10.1016/j.electacta.2023.142196. Disponível em: http://repositorio.ipen.br/handle/123456789/34088. Acesso em: 31 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.