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Nowadays, self healing nanocomposite coatings are the perfect solution for corrosion protection of Al alloys. So, in this paper, tetra butyl orthotitanat and aluminum alkoxide precursor with different percentage and functionally graded of Benzotriazole as an inhibitor used to applied titania- alumina- benzotriazole functionally graded hybrid coating on Al 2024 alloys by the sol-gel method and dipcoating process. Then phase, structure properties and morphology have been investigated by using GIXRD, FESEM and AFM , respectively, as well as the corrosion behavior and self healing properties of the coating was investigated by electrochemical impedance spectroscopy and polarization at 3.5% NaCl solution. The results of FESEM images show the grain size of titania, titania-alumina, titania- alumina- benzotriazole and functionally graded coating are 28, 18, 23 and 20 nm, respectively. Due to the size of the grain surface coatings and electrochemical investigations have been conducted, the results of polarization and electrochemical impedance spectroscopy of  functionally graded coating show the best performance, corrosion resistance and self healing behavior with corrosion current density of 19×10-6  mA/Cm2 and charge-transfer resistance (Rct) of 174286 Ω.Cm2 compared to titania, titaniaalumina and titania-alumina-benzotriazole with charge-transfer resistance, 108469, 95762 Ω.Cm2, respectively.

Keywords: Functionally graded coating, Nanocomposite, Titania- alumina- benzotriazole, Sol- gel, Corrosion behavior

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