MATEC Web Conf.
Volume 326, 2020The 17th International Conference on Aluminium Alloys 2020 (ICAA17)
|Number of page(s)||5|
|Section||Plenary Lecture & ECR Award Recipients|
|Published online||05 November 2020|
Unravelling the characteristics of Al-alloy corrosion at the atomic to nanometre scale by transmission electron microscopy
1 Department of Materials Science and Engineering, Monash University, Clayton, Victoria, 3800, Australia.
2 College of Engineering and Computer Science, The Australian National University, Acton, ACT, 2601, Australia.
* Corresponding author: firstname.lastname@example.org
The localised corrosion associated with Mg2Si in the Al-matrix of an Al-Mg-Si alloy was studied in 0.1 M NaCl at pH 6 by quasi in-situ transmission electron microscopy. Herein, physical imaging of corrosion at the atomic to nanometre scale was performed. Phase transformation and subsequent chemical composition variations associated with the localised corrosion of Mg2Si were studied. It was observed that corrosion initiated upon Mg2Si, often preferentially at the interface with the Al-matrix, and propagated until Mg2Si was completely dealloyed by Mg-dissolution, resulting in an amorphous SiO-rich phase remnant. The SiO-rich remnant became electrochemically inert and did not initiate corrosion in the Al-matrix. This study provides a clear understanding on the localised corrosion of Al-alloys associated with Mg2Si. In addition, the methodology followed in this study can also be applied to understand the role of precipitates and second phase particles in the localised corrosion of Al-alloy systems.
© The Authors, published by EDP Sciences, 2020
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