期刊
MATERIALS CHARACTERIZATION
卷 174, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111025
关键词
Aluminum alloys; Localized corrosion; Friction stir welding; Electrochemical techniques
类别
资金
- FAPESP [2013/13235/6, 2017/03095-3, 2019/18388-1]
- CAPES (Capes/Cofecub) [806-14]
- CAPES PROEX [88882.333459/2019-01, 88882.333479/2019-01]
This study investigated the microstructure and corrosion resistance of the stir zone (SZ) of the AA2198-T8 Al-Cu-Li alloy welded by friction stir welding (FSW) using microscopy, immersion tests, and electrochemical techniques. Severe localized corrosion (SLC) related to intergranular attack was observed in the SZ, while intragranular attack was found in the non-affected base metal (BM). The study revealed that SLC in both zones was caused by precipitates of high electrochemical activity.
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.
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