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Influence of hydrogen on the propagation of intergranular corrosion defects in 2024 aluminium alloy

Bonfils-Lahovary, Marie-Laëtitia de and Josse, Claudie and Laffont, Lydia and Blanc, Christine Influence of hydrogen on the propagation of intergranular corrosion defects in 2024 aluminium alloy. (2019) Corrosion Science, 148. 198-205. ISSN 0010-938X

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Official URL: https://doi.org/10.1016/j.corsci.2018.12.019

Abstract

To study the influence of hydrogen on the intergranular corrosion mechanism of a 2024 aluminium alloy, samples were hydrogen precharged by cathodic polarisation and then exposed to a NaCl solution. EBSD analyses and SEM observations showed that hydrogen increased the number of corroded interfaces and led to the embrittlement of low-angle grain boundaries which were not susceptible to corrosion without hydrogen precharging. The increase of the reactivity of the 2024 aluminium alloy in the presence of hydrogen gave a new insight into the intergranular corrosion mechanism: corrosion-induced hydrogen promoted the intergranular corrosion propagation and partially controlled the corrosion defect morphology.

Item Type:Article
HAL Id:hal-02135687
Audience (journal):International peer-reviewed journal
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 > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:08 Feb 2019 17:03

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