April 18, 2024
Ali Shanaghi

Ali Shanaghi

Academic rank: Associate Professor
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Education: Ph.D in eng
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Faculty: Technical Engineering

Research

Title Corrosion behavior of functionally graded and self-healing nanostructured TiO2–Al2O3 - Benzotriazole coatings deposited on AA 2024-T3 by the sol-gel method
Type Article
Keywords
Nanostructured TiO2–Al2O3-BTA coating, Functionally graded coating, Corrosion resistance, Sol-gel, Electrochemical impedance spectroscopy
Journal MATERIALS CHEMISTRY AND PHYSICS
Researchers Ali Shanaghi

Abstract

The corrosion behavior of titania-alumina-Benzotriazole and functionally graded (FG) coatings deposited on AA 2024-T3 is investigated. The FG coatings are doped with different amounts of Benzotriazole (BTA) as an inhibitor and the Al2O3–TiO2-BTA coating has a similar amount of BTA in the layers. The coatings are deposited by the sol-gel and dip-coating techniques and the morphology, structure, and corrosion resistance are investigated systematically. The amorphous TiO2–Al2O3-BTA and FG coatings with thicknesses of 2.3 and 2.6 μm show corrosion resistance of 105,672 Ω Cm2 and 252,731Ω. Cm2, respectively, after immersion in 3.5% NaCl for 96 h. The difference is caused by controllable release of BTA from the FG coatings. The results show that the FG coatings are superior to conventional nanostructured TiO2–Al2O3-BTA coatings from the perspective of corrosion protection.