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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS CHARACTERIZATION; v. 174, APR 2021.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 19/18388-1 - Efeito da microestrutura de ligas de Al de alta resistência na formação e comportamento frente à corrosão da camada anodizada
• Beneficiário: João Victor de Sousa Araujo
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/03095-3 - Investigação da suscetibilidade à corrosão de ligas Al-Cu-Li com solda por atrito (FSW) utilizando a técnica de varredura do eletrodo vibratório (SVET)
• Beneficiário: Uyime Donatus
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado