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Nano- and Micro-Scale Characterization of Anodic Oxide Layer Coating on 2017A-T4 Aluminum Alloy

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Abstract

In this paper, a multiscale characterization, down to nano, of the oxide layer coating obtained by sulfuric anodizing of 2017A-T4 aluminum alloy is proposed, under different processing conditions related to reaction/anodization time (RT) and applied electrical current (J). The multiscale characterization is carried out using scanning electron microscopy, energy-dispersive X-rays, and ImageJ post-processing software. It reveals that the oxide layer coating is a porous medium wherein the larger amount of porosity is micrometric, and that increasing RT and/or J leads to shallower and larger porosity and consequently thicker porous coating and oxide layer. Moreover, the percentage of the coating surface area covered by micrometer-scaled cavities decreases as the applied current increases. It also comes out from the multiscale analysis that the growth of the coating layer follows three main stages: the first stage is the germination of flaky and friable metastable nanoparticle oxides made of O, Al, and Si; the second stage is the growth of the oxide nanoparticles to become spherical microparticles; the third stage is the coalescence of the spherical particles to form clusters and then continuous stable layer that is rich of Si element.

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Acknowledgements

This project is carried out under the MOBIDOC program, funded by the EU through the EMORI program and managed by the ANPR. The authors acknowledge the LSPM (Laboratoire des Sciences des Procédés et des Matériaux, France), LASEM (Laboratoire des Systèmes Électromécaniques, Tunisia) laboratories, and SUPMECA Paris (School of Mechanical and Manufacturing Engineering) institute for the use of their instruments. Special thanks to SIAF (Société des ingénieurs pour les affaires, Tunisia) for providing us with the anodized aluminum samples. The authors are grateful to Dr. Ovidiu Brinza from LSPM, to Pr Emin Bayraktar and Dr. Dhurata Katundi from SUPMECA for their valuable assistance in making the microscopic observations.

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Correspondence to Mohamed Kchaou or Mohamed Haboussi.

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Abid, M., Sellami, A., Nouri, H. et al. Nano- and Micro-Scale Characterization of Anodic Oxide Layer Coating on 2017A-T4 Aluminum Alloy. Trans Indian Inst Met 74, 1001–1014 (2021). https://doi.org/10.1007/s12666-021-02217-6

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