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A comparative study on the corrosion resistance of AA2024-T3 substrates pre-treated with different silane solutions: Composition of the films formed |
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| Authors: | AM Cabral RG Duarte MF Montemor MGS Ferreira |
| Affiliation: | aISEL, Instituto Superior de Engenharia de Lisboa, Lisboa, Chemical Engineering, R. Conselheiro Emídio Navarro 1, 1950-052 Lisboa, Portugal bInstituto Superior Técnico, ICEMS, Av. Rovisco Pais, 1049-001 Lisboa, Portugal cUniversity of Aveiro, Department of Ceramics and Glass Engineering, Campus de Santiago, 3810-193 Aveiro, Portugal |
| Abstract: | This work reports a comparative study on the corrosion resistance of AA2024-T3 pre-treated with three different silane solutions. The silanes used for the pre-treatments of the AA2024-T3 panels were: 1,2-bis(triethoxysilyl)ethane (BTSE), bis-triethoxysilylpropyl]tetrasulfide (BTESPT) and γ-mercaptopropyltrimethoxysilane (γ-MPS). The analytical characterisation of the silane films was performed by Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS). The corrosion performance of the pre-treated substrates was evaluated by electrochemical impedance spectroscopy (EIS). The results show that the pre-treatments based on silanes provide good corrosion protection of unpainted AA2024-T3. Painted substrates, previously pre-treated with the silane solutions also revealed improved corrosion resistance and good adhesion properties. Fatigue tests show that the silane pre-treatments do not affect the fatigue behaviour of the AA2024-T3. The work also discusses the formation of the protective silane films. |
| Keywords: | AA2024-T3 EIS XPS Surface pre-treatment Silanes |
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