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 Effects of high concentration of Benzotriazole on corrosion behavior of nanostructured titania-alumina composite coating deposited on Al 2024 by sol-gel method
Type Article
Keywords
Nanostructured titania-alumina coating; Benzotriazole; Corrosion behavior; Al 2024; Sol-gel method
Journal SURFACE & COATINGS TECHNOLOGY
Researchers Ali Shanaghi

Abstract

Nanostructured titania-alumina coatings containing 1.2%, 3.6%, and 4.8% Benzotriazole as the self-healing agent are deposited on Al 2024 by the sol-gel method and dip coating. The phase composition and surface morphology are evaluated by XRD, FE-SEM, and AFM and the corrosion behavior is examined by electrochemical impedance spectroscopy and polarization tests in 3.5% NaCl solution for different immersion time periods of 1, 48, and 96 h. Uniform, homogeneous, and crack-free coatings with a thickness of about 3 μm are obtained. Release of Benzotriazole from the coatings blocks active sites and produces a barrier layer to improve the corrosion resistance of Al 2024. A protection efficiency of 76% is observed from the titania-alumina coating with 3.6% Benzotriazole and investigation of the impedance with immersion time confirms the self-healing behavior.