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Unravelling the characteristics of Al-alloy corrosion at the atomic to nanometre scale by transmission electron microscopy

Version 2 2024-06-02, 23:56
Version 1 2023-10-20, 02:42
conference contribution
posted on 2024-06-02, 23:56 authored by Shravan K Kairy, Nick BirbilisNick Birbilis
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.

History

Journal

17TH INTERNATIONAL CONFERENCE ON ALUMINIUM ALLOYS 2020 (ICAA17)

Volume

326

Article number

ARTN 01007

Pagination

1-5

Location

France

Start date

2020-10-26

End date

2020-10-29

ISSN

2261-236X

eISSN

2261-236X

Language

Eng

Publication classification

E1.1 Full written paper - refereed

Editor/Contributor(s)

DeGeuser F, Deschamps A, Ehrstrom JC, Jarry P, SalloumAbouJaoude G, Salvo L, Sigli C

Title of proceedings

edp sciences journals

Event

17th International Conference on Aluminium Alloys (ICAA)

Publisher

E D P SCIENCES

Series

MATEC Web of Conferences