PSI - Issue 37

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 37 (2022) 941–947

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Abstract The present work investigates the influence of two different ageing tempers (T3 and T8) on the corrosion resistance of Al-Cu-Li (2198) aluminium alloy. Electrochemical impedance spectroscopy (EIS) measurements were employed in 3.5 wt. % NaCl solution to investigate the corrosion behaviour of the alloy. Additionally, the related equivalent circuit model was established to analyse the corrosion mechanism of this alloy. The EIS results showed two different corrosion mechanisms for the different exposure times in both tempers of the alloy; pitting corrosion – associated with attack of the surface oxide film - occurs between 1 h and 6 h of immersion while corrosion dissolution becomes severe after 12 h corrosion exposure time. The T8 temper showed lower corrosion resistance of the oxide film in the first stages of exposure, but corrosion attack seems to propagate in lower rates at this temper, when compared to the T3 temper. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: corrosion; aluminum alloy; pitting; degradation 1. Introduction Recent studies are focusing to the mechanical and electrochemical behaviour of Al – Cu – Li alloys, e.g. Araujo et al. (2018), Donatus et al. (2018) and Huang et al. (2016), since they play a pivotal role in the aerospace industry, e.g. Rioja et al. (2012). The constantly growing interest in the study of these materials arises from the lithium addition- ICSI 2021 The 4th International Conference on Structural Integrity Corrosion resistance of aluminum alloy 2198 for different ageing tempers Dimitris Georgoulis, Christina M. Charalampidou and Nikolaos D. Alexopoulos * Research Unit of Advanced Materials, Department of Financial Engineering, School of Engineering, University of the Aegean, 41 Kountouriotou str, 821 32 Chios, Greece

* Corresponding author. Tel.: +30-22710-35464; fax: +30-22710-35410. E-mail address: nalexop@aegean.gr

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.029