Localised corrosion assessment of friction-stir welded AA7050-T76511 alloy: galvanic interactions and microstructural effects
In this work, the localised corrosion behaviour of friction stir welded (FSW) AA7050-T76511 alloy was studied using micro-electrochemical scanning methods combined with surface characterisation. The study focused on macro galvanic interactions between the stir zone (SZ) and thermo-mechanically/heat-affected zones (TMAZ/HAZ), considering distinct initial micro-structures created by an L-bent pre-welding configuration at advancing and retreating sides. Agar-visualisation, local electrochemical impedance spectroscopy and scanning vibrating electrode technique revealed significant galvanic coupling. The TMAZ/HAZ regions behaved anodically relative to the SZ, with notably higher electrochemical activity observed at the AS. These findings demonstrate the critical influence of initial microstructural differences on corrosion susceptibility in FSW AA7050 alloys.
Authors
- Isolda Costa (ORCID: https://orcid.org/0000-0002-4987-3334)
- Fernanda Martins Queiróz (ORCID: https://orcid.org/0000-0003-3309-1116)
- Oscar Maurício Prada Ramirez (ORCID: https://orcid.org/0000-0001-6904-8959)
- Hercílio Gomes de Melo (ORCID: https://orcid.org/0000-0002-9116-681X)
- João Victor de Sousa Araujo (ORCID: https://orcid.org/0000-0001-6375-0480)
- Maysa Terada (ORCID: https://orcid.org/0000-0002-2011-5759)
- Julián Arnaldo Ávila (ORCID: https://orcid.org/0000-0002-5893-4725)
Institutions
- Serviço Nacional de Aprendizagem Industrial (BR)
- Universidade de São Paulo (BR)
- Laboratório Nacional de Ciência e Tecnologia do Bioetanol (BR)
- Instituto de Pesquisas Energéticas e Nucleares (BR)
- Brazilian Center for Research in Energy and Materials (BR)
- Universidade Estadual Paulista (Unesp) (BR)
Publication Details
- Journal
- Corrosion Engineering Science and Technology The International Journal of Corrosion Processes and Corrosion Control
- Published
- 2025-05-28
- DOI
- https://doi.org/10.1177/1478422x251342577
- Citations
- 1
- Primary Topic
- Advanced Welding Techniques Analysis
- Type
- article
- Field-Weighted Citation Impact
- 0.71
Funders
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Conselho Nacional de Desenvolvimento Científico e Tecnológico