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Analytical characterisation and corrosion behaviour of bis-[triethoxysilylpropyl]tetrasulphide pre-treated AA2024-T3 |
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| Authors: | A Cabral RG Duarte ML Zheludkevich |
| Affiliation: | a Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emídio Navarro, 1-1950-062 Lisboa, Portugal b Instituto Superior Técnico, ICEMS, Department of Chemical Engineering, Avenue Rovisco Pais 1049-001 Lisboa, Portugal c Department of Ceramics and Glass Engineering, University of Aveiro, 3810-193, Aveiro, Portugal |
| Abstract: | This work aims at studying the corrosion behaviour of AA2024-T3 pre-treated with bis-triethoxysilylpropyl]tetrasulphide. Simultaneously, the work investigates the influence of the Cu-rich intermetallic particles on the formation of the silane film. The analytical characterisation of the silane films was performed by Auger electron spectroscopy and X-ray photoelectron spectroscopy. The corrosion performance of the pre-treated substrates was evaluated by electrochemical impedance spectroscopy. Atomic force microscopy associated with Kelvin probe was also used to determine the influence of the silane film on the Volta potential distribution on the alloy surface. The results show that copper present in the intermetallics plays an important role on the film formation. |
| Keywords: | AA2024-T3 B EIS B XPS B AFM Surface pre-treatment Silanes |
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