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Focus on the interactions between artificial microstructural ageing and susceptibility to localized corrosion under cyclic corrosion tests of an aeronautic 2024-T351 aluminium alloy

Larignon, Céline and Andrieu, Eric and Alexis, Joël and Odemer, Grégory and Blanc, Christine Focus on the interactions between artificial microstructural ageing and susceptibility to localized corrosion under cyclic corrosion tests of an aeronautic 2024-T351 aluminium alloy. (2012) In: EUROCORR 2012, 9 September 2012 - 13 September 2012 (Istanbul, Turkey).

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Abstract

The 2024-T351 aluminium alloy is widely used in aircraft industry especially for skin and wings due to its high-strength to weight ratio. During their service life, these structural parts can be submitted to different sources of damage as fatigue, corrosion and / or microstructural evolutions. In this work, fatigue was not considered. To be closer to these real conditions, sample were exposed cyclically to corrosive media to simulate the alternation of flying and parking period to which aircraft structure can be submitted. A previous study showed that these cyclic exposure conditions led to enhanced corrosion damage and to a more important decrease of mechanical properties than the ones measured after continuous immersion tests [1, 2]. As both microstructural evolution and corrosion processes can affect simultaneously aircraft structural pieces, the present study was focused on microstructural evolution that can occur during their service life and on the impact of these evolutions on the corrosion behaviour of the AA2024. To simulate the potential evolution of microstructure, heat treatments at 150 °C were performed on an AA2024-T351 during 27 h, 55 h and 177 h. The microstructure of the artificially-aged material was characterized using optical microscopy, scanning electron microscopy and transmission electron microscopy. The evolution of mechanical properties was also followed according to the duration of heat treatment. Following these heat treatments, the corrosion behaviour of the alloy under cyclic exposure conditions was characterized. A statistical analysis of the intergranular corrosion damage was conducted by the systematic observation of more than 400 grain boundaries. Further, the residual mechanical properties of the heat treated and corroded material were estimated. The results obtained gave information about the potential degradations that can occur in an aeronautic structural part induced by microstructural ageing and / or corrosion and especially about the interactions between these two kinds of damage. It appeared that the susceptibility to localized corrosion was strongly affected by both artificial ageing and the exposure condi-tions.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Joël ALEXIS
Deposited On:16 Jan 2014 15:17

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