Effect of Benzotriazole, s concentration on corrosion and nano mechanical properties of alumina hybrid nanostructured coating

In this paper, alumina hybrid nanostructured coating involving different amount of nano encapsulated organic inhibitor, Benzotriazole, such as, 1.8, 3.6 and 5.4 % has been applied by sol-gel method through a dip-coating process on Aluminium alloy 2024 as a substrate. Phase structural, morphologicalproperties, Corrosion behavior and nano-mechanical properties have been evaluated by using GIXRD, SEM and FESEM, tafle polarization according to ASTM G59 standard and electrochemical impedance spectroscopy in 3.5% NaCl solution, nano indentation and nanoscratch analyses, respectively. The results showed the homogeneity and uniformity of the coating and increasing in the resistance corrosion of Aluminium 2024 by preventing nucleation and growth of cracks through a migration of Benzotriazole inhibitors from the nano-containers, and also improving hardness and ductility, especially at optimum amount 3.6% of Benzotriazole.