Abstract
• Sol–gel coating doped with 8-hydroxyquinoline was prepared by dip-coating technique. • The corrosion resistance of the sol–gel coating on AA 2024-T3 was studied. • 8-Hydroxyquinoline hindered the corrosion from a defect in the sol–gel coating. This work presents the silane-based sol–gel coatings that prepared by in situ doping 8-hydroxyquinoline as corrosion inhibitor for the protection of AA 2024-T3. The morphology and thickness of the sol–gel coatings were observed by scanning electron microscope (SEM). Immersion tests and electrochemical impedance spectroscopy (EIS) were used to study the corrosion resistance of the blank and 8-hydroxyquinoline doped sol–gel coatings. The results indicate that the addition of 8-hydroxyquinoline effectively improved the corrosion resistance of the sol–gel coatings. The self-healing effect of 8-hydroxyquinoline on the corrosion in the defects of sol–gel coating was assessed by scanning vibrating electrode technique (SVET) and proved by the results of energy-dispersive X-ray spectroscopy (EDS) mapping.
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