期刊
CORROSION SCIENCE
卷 166, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108453
关键词
Aluminium; Intermetallics; SEM; TEM; Pitting corrosion; Interfaces
资金
- Centre of Excellence of Multifunctional Architectured Materials (CEMAM) - Investments for the Future program [ANR-10-LABX-4401]
- ANRT (Association Nationale de la Recherche et de la Technologie)
An Al-Mg-Si aluminium alloy was shaped by using a two-pass equal-channel angular pressing (ECAP) process. This led to fragmentation of the coarse Fe-rich intermetallics (IMCs), a decrease in grain size and an increase in the high angle grain boundary (HAGB) density, with overconcentration of HAGBs around the IMCs. Corrosion tests in NaCl solution showed that, before and after ECAP, only pitting corrosion occurred. However, for ECAP samples, pits were more numerous due to the fragmentation of the IMCs; they were also larger and less deep, their propagation being strongly influenced by the presence of very small grains around the IMCs.
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