Localised corrosion initiation and microstructural characterisation of an Al 2024 alloy with a higher Cu to Mg ratio |
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| Authors: | J.A. DeRose T. Suter A. Bałkowiec J. Michalski K.J. Kurzydlowski P. Schmutz |
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| Affiliation: | 1. Laboratory for Corrosion and Materials Integrity, Abteilung 136, EMPA (Swiss Federal Institute of Materials Science and Technology), Überlandstrasse 129, CH-8600 Dübendorf ZH, Switzerland;2. Faculty of Materials Science and Engineering (InMat), Warsaw University of Technology, Wo?oska 141, P-02-507 Warszawa, Poland |
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| Abstract: | An Al 2024 (AA2024-T351) alloy having less Mg and a higher proportion of Cu to Mg (mass ratio ≈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 θ 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. |
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