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Corrosion Damages Induced by Cyclic Exposure of 2024 Aluminum Alloy in Chloride-Containing Environments

Larignon, Céline and Alexis, Joël and Andrieu, Eric and Blanc, Christine and Odemer, Grégory and Salabura, Jean-Claude Corrosion Damages Induced by Cyclic Exposure of 2024 Aluminum Alloy in Chloride-Containing Environments. (2011) Journal of The Electrochemical Society (JES), vol. 158 (n° 6). pp. C284-C295. ISSN 0013-4651

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Official URL: http://dx.doi.org/10.1149/1.3610401

Abstract

This paper focuses on the influence of cyclic exposure to chloride solutions on corrosion damage morphology developed on AA2024. The influence of the temperature during the air exposure periods was studied. Cyclic corrosion tests led to enhanced global corrosion damage compared to continuous immersion tests with residual mechanical properties of corroded samples significantly lower for cyclic tests. The corrosion morphology depended on the exposure conditions. For cyclic tests with air exposure periods at room temperature (CR tests), the corrosion defects were significantly longer; for a cyclic test with air exposure periodsat -20 °C (CF tests), the propagation of corrosion defects was not promoted; however, the density of corroded grain boundaries was markedly increased. For CR samples, the corrosion damage observed was mainly explained taking into account electrochemical processes occurring at the tip of the defect which could be considered as an occluded zone characterized by a chloride-enriched electrolyte and Hþ reduction as major cathodic reaction. For CF tests, the interaction between the stresses induced by the phase transformation of the medium i.e solidification and the hydrogen enrichment of the substrate could be a possible mechanism explaining the evolution of the global mechanical properties of the corroded samples

Item Type:Article
Additional Information:Thanks to Electrochemical Society editor. The definitive version is available at http://www.electrochem.org/ The original PDF of the article can be found at Journal of The Electrochemical Society website: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JESOAN00015800000900C284000001&idtype=cvips&gifs=yes&ref=no
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Denis Faragou

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