Journal
CORROSION SCIENCE
Volume 55, Issue -, Pages 313-325Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2011.10.035
Keywords
Aluminium; Alloy; SEM; STEM; Polarisation; Pitting corrosion
Funding
- EU Commission [AST5-CT-2006-030804]
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An Al 2024 (AA2024-T351) alloy having less Mg and a higher proportion of Cu to Mg (mass ratio approximate to 3.7) has been characterised to provide input data for microscale and macroscale corrosion models. The Al 2024 alloy microstructure has a significant presence of nanoscale dispersoid and microscale AlCuFeMnSi (2nd phase) intermetallic particles, but a smaller population of microscale S phase (Al2CuMg) and theta phase (Al2Cu) intermetallic particles. Microscale electrochemical data show that pitting potential (SCE) values for 2nd phase, S phase, or matrix overlap significantly. The localised corrosion susceptibility is affected by S and inhomogeneous 2nd phase particles. (C) 2011 Elsevier Ltd. All rights reserved.
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