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Inhibiting effect of 8-hydroxyquinoline on the corrosion of silane-based sol–gel coatings on AA 2024-T3 |
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| Affiliation: | 1. Centro de Quimica Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. Magnesium Innovation Centre MagIC, Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502, Germany;3. Department of Materials Science and Engineering, Delft University of Technology, The Netherlands;1. School of Chemistry and Chemical Engineering Chongqing University, Chongqing, 400044, China;2. Light Alloy Research Institute, Central South University, Changsha 410083, China |
| Abstract: | 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. |
| Keywords: | 8-Hydroxyquinoline SVET Aluminium alloy Corrosion inhibitor Electrochemical impedance spectroscopy |
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