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Effect of new sealing treatments on corrosion fatigue lifetime of anodized 2024 aluminium alloy

Priet, Bertrand and Odemer, Grégory and Blanc, Christine and Giffard, Kévin and Arurault, Laurent Effect of new sealing treatments on corrosion fatigue lifetime of anodized 2024 aluminium alloy. (2016) Surface and Coatings Technology, 307. 206-219. ISSN 0257-8972

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.surfcoat.2016.07.083


The effect of two sealing processes, i.e. an usual hydrothermal sealing and an innovating sealing process called (B1 + B2), on fatigue behavior of anodized AA2024 was studied in air for as prepared and pre-corroded samples. Pre-corrosion exposure corresponded to salt-spray tests or continuous immersions. For salt-spray tests, the best corrosion resistance was related to the (B1+B2) sealing and, for continuous immersions, to the hydrothermal sealing. Fatigue life tests in air on pre-corroded samples revealed that anodized samples presented a decrease in fatigue life more pronounced than anodized and sealed samples in relation with a lower corrosion resistance; fatigue crack initiation was localized on pits issued from the degreasing and pickling steps. Independent of the sealing process, the fatigue behavior of the anodized and sealed samples depended on the pre-corrosion exposure. Corrosion fatigue tests induced an additional decrease in fatigue life for both sealing treatments. Crack initiation occurred preferentially on pits issued from degreasing and pickling but also on pits issued from interaction between cyclic loading and corrosive media, in relation with amechanical damage of the sealed anodic film. The differences in sealed layer morphology could explain the difference in fatigue resistance between the sealed anodic films.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at http://www.sciencedirect.com/science/article/pii/S0257897216306867
HAL Id:hal-01480521
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 - Toulouse INP (FRANCE)
Other partners > MÉCAPROTEC Industries (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
European Regional Development Fund (ERDF) - French Ministry of Industry (DIRECCTE) - theMidi-Pyrénées Region
Deposited On:01 Mar 2017 13:17

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