Surface finishing effects on the corrosion behavior and electrochemical activity of 2098-T351 aluminum alloy investigated using scanning microelectrochemical techniques

Autor(es)

da Silva, Rejane Maria P. ; Milagre, Mariana X. ; Izquierdo, Javier ; Betancor-Abreu, Abenchara Maria ; de Oliveira, Leandro A. ; Araujo, Joao Victor de S. ; Antunes, Renato A. ; Souto, Ricardo M. ; Costa, Isolda

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS CHARACTERIZATION; v. 191, p. 12-pg., 2022-07-18.

Resumo

The effects of surface finishing on the corrosion behavior and electrochemical activity of AA2098-T351 (Al-Cu-Li alloy) were investigated on the basis of the correlation between surface chemistry, microstructure and electrochemical activity. The alloy was evaluated in the as-received and polished conditions. The morphology of the two types of surfaces was investigated using confocal laser scanning microscopy (CLSM), optical microscopy and optical 3D profilometry. The surface chemistry was analyzed by X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX). Scanning microelectrochemical techniques (namely, localized electrochemical impedance spectroscopy (LEIS), the scanning vibrating electrode technique (SVET) and scanning electrochemical microscopy (SECM) in potentiometric mode) were used to examine the electrochemical activity of the surfaces. The results showed that on the as-received surface, the near surface deformed layer (NSDL), which is composed of Mg-rich bands, influenced the corrosion activity of the alloy. Higher electrochemical activity and greater susceptibility to severe localized corrosion were related to the polished surface condition compared to the as-received one. (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
• Processo FAPESP: 19/11427-1 - Técnicas micro-eletroquímicas para estudar a corrosão localizada em ligas Al-Cu-Li soldadas por fricção (FSW)
• Beneficiário: Rejane Maria Pereira da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 18/06880-6 - Utilização de técnicas eletroquímicas localizadas para estudo da corrosão de ligas de alumínio de elevada resistência mecânica soldadas por fricção (FSW).
• Beneficiário: Rejane Maria Pereira da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado