Document Type : Original Article
Authors
1
Laboratory of the Interactions Materials-Environment (LIME), Jijel University, Jijel 18000, Algeria
2
Faculty of Mechanical Engineering and Process Engineering, Department of Chemical and Cryogenic Engineering, University of Science and Technology Houari Boumediene (USTHB), Algiers, Algeria
3
Faculty of Technology, Department of Renewable Energy, Blida 1 University, Algeria
4
Laboratory of Energy Processes and Nanotechnology, Faculty of Sciences, Blida 1 University, Algeria
5
Chemical Engineering Laboratory, Department of Industrial Chemistry, Blida 1 University, Algeria
6
Faculty of Mechanical Engineering and Process Engineering, Department of Materials Science, University of Science and Technology Houari Boumediene (USTHB), Algiers, Algeria
Abstract
The improvement of anticorrosion properties in hybrid structures is currently a promising area of research due to their potential for multifunctional applications. This paper evaluates the corrosion behavior of ZnAl2O4/γ-Al₂O₃ duplex coatings, which were created by electrodepositing a nanostructured ZnO thin film onto nanoporous anodic alumina (AAO). The AAO was synthesized using two electrochemical anodization processes: single-step anodizing (SSA) and two-step anodizing (TSA). ZnAl₂O₄ was produced using an applied electric field of (-1.5 V). Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were employed to evaluate the corrosion behavior in a 3.5 wt.% NaCl solution.The successful deposition of zinc aluminate on AAO was confirmed through additional characterization techniques included X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and glow discharge optical emission spectroscopy (GDOES). scanning electron microscopy observations revealed a uniform network of ZnAl2O4nanoplates on the AAO substrate. Regarding corrosion properties, the measurements show that the ZnAl2O4/γ-Al₂O₃ coatings produced through the TSA process achieve a polarization resistance of 650 kΩ.cm2, compared to 95 kΩ.cm2 for those prepared by the SSA method. Overall, these findings suggest that ZnAl2O4/γ-Al₂O₃ duplex coatings have excellent potential as corrosion-resistant coatings for advanced applications.
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