期刊
CORROSION SCIENCE
卷 131, 期 -, 页码 300-309出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2017.12.001
关键词
aluminium; TEM; SEM; pitting corrosion
资金
- CAPES [1536157]
- FAPESP [2013/13235-6, 2017/03095-3]
- CAPES(Capes/Cofecub) [806-14]
The corrosion behaviour of AA2198-T851 alloy has been investigated using a combination of immersion tests and different microscopy techniques. Results showed that severe localized corrosion initiated within 1 h of corrosion immersion test in 0.01 mol L-1 NaCl solution. The corrosion mechanism in this alloy is intragranular and it propagates crystallographically. The propagation occurs through grain orientation dependent bands and it can be likened to the movement of dislocation through slip planes. Corrosion rings around stable pits result from pH variations. Secondary pits form around primary pits within corrosion rings and are preceded by hydrogen evolution.
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