Journal
MATERIALS CHARACTERIZATION
Volume 191, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.112130
Keywords
Al-cu-Li alloy; Surface preparation effects; Microelectrochemical techniques; Localized corrosion; NSDL; Electrochemical activity
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Funding
- Fundacao de Amparoa Pesquisa do Estado de Sao Paulo- FAPESP [2022/0000586, Proc. 2013/13235-6, Proc.2018/06880-6]
- University of La Laguna
- Spanish Ministry of Science, Innovation and Universities (Madrid, Spain) [Proc. 2019/11427-1]
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This study investigated the effects of surface finishing on the corrosion behavior and electrochemical activity of AA2098-T351 (Al-Cu-Li alloy) by analyzing the correlation between surface chemistry, microstructure, and electrochemical activity. The results showed that the polished surface condition exhibited higher electrochemical activity and greater susceptibility to severe localized corrosion compared to the as-received one.
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.
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