Effect of friction stir welding (FSW) on the electrochemical behavior and galvanic coupling of AA2024-T3 and AA7475-T651

Autor(es)

Bugarin, A. F. S. ^[1] ; De Abreu, C. P. ^[1] ; Terada, M. ^[2] ; De Melo, H. G. ^[3] ; Costa, I ^[1]

Afiliação do(s) autor(es)

^[1] Inst Pesquisas Energet & Nucl, Ctr Ciencia & Tecnol Mat, Av Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP - Brazil

^[2] Inst SENAI Inovacao Manufatura Avancada & Microfa, Rua Bento Branco de Andrade Filho 379, BR-04757000 Sao Paulo, SP - Brazil

^[3] Univ Sao Paulo, Dept Engn Met & Mat, Av Prof Mello Moraes 2463, BR-05508030 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS TODAY COMMUNICATIONS; v. 25, DEC 2020.
• Citações Web of Science: 0

Resumo

In this study, the local electrochemical activity of AA2024-T3 and AA7475-T761 joined by friction stir welding (FSW) was investigated as a function of time by electrochemical tests in 0.01 mol L-1 NaCl solution using a mini cell. The welding procedure resulted in increased electrochemical activity of the weld affected zones of both alloys, which electrochemical activities increased with immersion time, as demonstrated by the electrochemical behavior. In the heat affected zone (HAZ) and the thermomechanically affected zone (TMAZ) of AA7475-T651 the increased activity was due to precipitation of eta phase at the grain boundaries stimulated by thermomechanical effects. On the other hand, the enhanced activity in the TMAZ/HAZ of the AA2024-T3 was associated to a large concentration of copper rich cathodic particles broken by tool rotation that were spread along this zone. However, the zone of highest electrochemical activity was the stir zone (SZ) and this was ascribed to galvanic coupling between the two alloys, AA2024-T3 and the AA7475-T651, where the former acted as cathodic and the latter as anodic area. (AU)

• Processo FAPESP: 13/13235-6 - Estudo da corrosão localizada e caracterização da resistência à corrosão associada à fadiga na região de solda em ligas de alumínio de elevada resistência soldadas por fricção (FSW)
• Beneficiário: Isolda Costa
• Modalidade de apoio: Auxílio à Pesquisa - Temático