Abstract
The corrosion behaviour of a recently developed Al-Li-Cu-Mg alloy thick plate was investigated using correlative immersion testing in 3.5% NaCl solution with analytical electron and ion microscopy. Intergranular corrosion was observed along grain boundaries and the particle-matrix interface of Al7Cu2(Fe, Mn) and Al20Cu2Mn3 phases from 7 min of immersion. The Li-containing Al7Cu2(Fe, Mn) phases are electrochemically more active and susceptible to de-alloying than the Al20Cu2Mn3 phases. Intergranular T1 (Al2CuLi) precipitates are attacked via selective dissolution of Li and Al. In contrast to previous observation, the dissolution rates of T1 precipitates and the adjacent alloy matrix are almost the same.
Original language | English |
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Article number | 110294 |
Journal | Corrosion Science |
Volume | 201 |
Early online date | 4 Apr 2022 |
DOIs | |
Publication status | Published - 1 Jun 2022 |
Keywords
- Aluminium-lithium alloy
- Constituent intermetallic phase
- Correlative microscopy
- Intergranular corrosion
- Precipitate
Research Beacons, Institutes and Platforms
- Photon Science Institute
- Henry Royce Institute
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Nanoscale Secondary Ion Mass Spectrometry (NanoSIMS)
Moore, K. (Academic lead) & Li, K. (Technical Specialist)
Materials EngineeringFacility/equipment: Facility
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Surface Characterisation
Spencer, B. (Platform Lead), Nikiel, M. (Technical Specialist), Sheraz, S. (Technical Specialist), Li, K. (Technical Specialist), Dwyer, L. (Technical Specialist), Wall, S. (Technical Specialist), Williams, W. (Technical Specialist), Forrest, A. (Senior Technician), Fong, J. (Senior Technician), Filip, T. (Technician), Kundu, S. (Technical Specialist), Moore, K. (Academic lead), Walton, A. (Academic lead) & Lockyer, N. (Academic lead)
FSE ResearchFacility/equipment: Platform