Corrosion of aluminium alloy AA2024-Τ3 specimens subjected to different artificial ageing heat treatments

Christina Margarita Charalampidou; Nicoleta Siskou; Dimitris Georgoulis; Stavros K. Kourkoulis; Mikhail Zheludkevich; Nikolaos D. Alexopoulos

doi:10.1038/s41529-024-00503-4

npj Materials Degradation (Sep 2024)

Corrosion of aluminium alloy AA2024-Τ3 specimens subjected to different artificial ageing heat treatments

Christina Margarita Charalampidou,
Nicoleta Siskou,
Dimitris Georgoulis,
Stavros K. Kourkoulis,
Mikhail Zheludkevich,
Nikolaos D. Alexopoulos

Affiliations

Christina Margarita Charalampidou: University of the Aegean, School of Engineering, Department of Financial Engineering, Research Unit of Advanced Materials
Nicoleta Siskou: University of the Aegean, School of Engineering, Department of Financial Engineering, Research Unit of Advanced Materials
Dimitris Georgoulis: University of the Aegean, School of Engineering, Department of Financial Engineering, Research Unit of Advanced Materials
Stavros K. Kourkoulis: National Technical University of Athens, Department of Mechanics, Laboratory of Testing and Materials, 9 Heroes Polytechniou Str
Mikhail Zheludkevich: Helmholtz-Zentrum Hereon, Institute of Surface Science
Nikolaos D. Alexopoulos: University of the Aegean, School of Engineering, Department of Financial Engineering, Research Unit of Advanced Materials

DOI: https://doi.org/10.1038/s41529-024-00503-4
Journal volume & issue: Vol. 8, no. 1
pp. 1 – 19

Abstract

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Abstract The effect of artificial-ageing on corrosion behaviour of aluminium alloy (AA)2024-T3 was investigated. The natural ageing which takes place during the aircraft's lifespan was simulated with isothermal heat-treatments at 190 °C. Electrochemical impedance spectroscopy measurements were performed in different heat-treated specimens to examine the prevailing corrosion mechanisms. Additionally, pre-corroded tensile specimens from different heat-treatment conditions were mechanically tested to assess the corrosion-induced degradation. Different forms of corrosion were revealed in the investigated ageing tempers; intense localized attack was noticed in the initial (T3) and under-aged (UA) tempers. UA condition exhibited the highest susceptibility to corrosion propagation followed by T3, according to the charge transfer resistance R CT and degradation rate of tensile elongation at fracture A f ( ≈ 0.118) and ( ≈ 0.103), respectively. Corrosion-induced degradation rates for the peak-aged (PA) and over-aged (OA) tempers ( ≈ 0.042 and 0.054, respectively) were almost one third of UA, attributed to volume fraction and size of the precipitated second-phase particles.

Published in npj Materials Degradation

ISSN: 2397-2106 (Online)
Publisher: Nature Portfolio
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.nature.com/npjmatdeg/

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