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FESEM and EIS Study of Sealed AA2024 T3 Anodized in Sulfuric Acid Electrolytes: Influence of Tartaric Acid

Boisier, Grégory and Pébère, Nadine and Druez, Catherine and Villatte, Martine and Suel, Stéphane FESEM and EIS Study of Sealed AA2024 T3 Anodized in Sulfuric Acid Electrolytes: Influence of Tartaric Acid. (2008) Journal of The Electrochemical Society (JES), vol. 155 (n° 11). C521-C529. ISSN 0013-4651

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Official URL: http://dx.doi.org/10.1149/1.2969277

Abstract

The present study investigates the effect of tartaric acid on anodic film morphology and on corrosion resistance of hydrothermally sealed anodized AA2024. Anodizing treatment was performed in dilute sulfuric acid electrolyte with or without addition of tartaric acid. Hydrothermal sealing was carried out in boiling water for each anodized specimen. The morphology of the sealed anodic films was examined using field-emission scanning electron microscopy (FESEM). Electrochemical impedance spectroscopy (EIS) was performed to assess sealing quality and corrosion resistance of the anodic films. It was shown that the sealing was more efficient in the case of anodic films formed in tartaric acid electrolyte mainly due to their lower porosity. It was also observed that the properties of the barrier layer were higher when sealing was performed on specimens anodized in the presence of tartaric acid. This suggests a specific role of the species on the barrier layer, which contributes to the enhancement of the performance in terms of corrosion resistance of the sealed anodic films. The present study clearly validates the beneficial role of tartaric acid in anodizing baths for the corrosion protection of AA2024.

Item Type:Article
Additional Information:Thanks to Electrochemical Society editor. The definitive version is available at http://scitation.aip.org The original PDF of the article can be found at Journal of The Electrochemical Society website : http://www.ecsdl.org/JES/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > EADS N.V. (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Celine Cabaup

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