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
Original languageEnglish
Title of host publicationAluminium Alloy Corrosion of Aircraft Structures Modelling and Simulation
Place of PublicationSouthampton
PublisherWIT Press
Pages41-57
Number of pages17
ISBN (Print)978-1-84564-752-0
Publication statusPublished - 10 Dec 2012

Publication series

NameAluminium Alloy Corrosion of Aircraft Structures Modelling and Simulation

    Research areas

  • AA2024, intermetallic particle, Localized corrosion

ID: 2315330