Journal
CORROSION SCIENCE
Volume 107, Issue -, Pages 41-48Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2016.02.018
Keywords
Aluminium; Alloy; SEM; TEM; Pitting corrosion
Funding
- National Natural Science Foundation of China [51301214, 51541102, 51275037]
- Fundamental and Cutting-edge Research Plan of Chongqing [cstc2013jcyjA50017]
- EPSRC LATEST2 Program Grant
- EPSRC [EP/H020047/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H020047/1] Funding Source: researchfish
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The mechanism for localised corrosion in AA 2099-T83 alloy during immersion in 3.5% NaCl solution is investigated. It is found that localised corrosion tends to occur in the grain with relatively large Schmid factor. The localised corrosion is related to selective dissolution of T-1 (Al2CuLi) phase that preferentially precipitates at grain/subgrain boundaries and dislocations within grain interiors. A model is proposed to explain the development of the localised corrosion in the alloy by taking into account heterogeneous plastic deformation during cold working and preferential precipitation of T-1 phase at crystallographic defects within deformed grains. (C) 2016 The Authors. Published by Elsevier B.V.
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