Subsection 3a Modelling of the Aluminium Alloy AA2024 at the Microscale: Pitting and Intergranular Corrosion

Levente-Csaba Abodi, Olga Guseva, James Derose, Steven Van Damme, Andrei stefan Demeter, Thomas Suter, Johan Deconinck, Patrik Schmutz

Onderzoeksoutput: Other chapter contributionResearch

Samenvatting

A mass transport model has been developed that attempts to simulate the initiation and propagation and intergranular corrosion of the aluminium alloy AA2024 (Al 2024) at the microscale.
Unlike previous models, the model does not use the assumption that the system is at all times in a state of chemical equilibrium.
In order to model localised corrosion initiation on Al alloys, one has to consider their complex microstructure which normally has a high number of structural inhomogeneities. We have considered localised corrosion initiation on Al 2024 in sodium chloride solution.
As already discussed in Subsection 2b of this book, the intermetallic particles found in the Al 2024 alloy can be divided into three major types: AlCuFeMnSi (second phase) intermetallics, Al2Cu (theta phase) precipitates, which are more noble than the Al matrix (areas of the alloy without constituent microscale particles), and Al2CuMg (S phase) precipitates, which are the preferential initiation sites for localised corrosion.
The propagation of intergranular corrosion is modelled using a deep, narrow crevice formed at a grain boundary.
The results from these microscopic mass transport models could provide input data for the macroscopic intergranular and crevice corrosion models discussed in Subsections 3b and 3c. Results show that this modelling approach gives useful output data but requires very careful consideration of the input data
Originele taal-2English
TitelAluminium Alloy Corrosion of Aircraft Structures Modelling and Simulation
Plaats van productieSouthampton
UitgeverijWIT Press
Pagina's41-57
Aantal pagina's17
ISBN van geprinte versie978-1-84564-752-0
StatusPublished - 10 dec 2012

Publicatie series

NaamAluminium Alloy Corrosion of Aircraft Structures Modelling and Simulation

Bibliografische nota

J. DeRose, T. Suter, T. Hack, R.A. Adey

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