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The corrosion resistance of hot dip galvanised steel and AA2024-T3 pre-treated with bis-[triethoxysilylpropyl] tetrasulfide solutions doped with Ce(NO3)3 |
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| Authors: | AM Cabral W Trabelsi MF Montemor MGS Ferreira |
| Affiliation: | a Instituto Superior Técnico, ICEMS, DEQ, Av. Rovisco Pais 1049-001 Lisboa, Portugal b Instituto Superior de Engenharia de Lisboa, DEQ, 1950-062 Lisboa, Portugal c ENIT, Unité de Recherche de Corrosion, Tunes, Tunisia d Department of Ceramics and Glass Engineering, University of Aveiro, 3810-193 Aveiro, Portugal |
| Abstract: | The present work aims at evaluating the anti-corrosion behaviour of a novel pre-treatment based on bis-triethoxysilylpropyl] tetrasulfide (BTESPT) doped with cerium nitrate for application on hot dip galvanised steel and AA2024-T3 substrates. The corrosion resistance was evaluated by electrochemical impedance spectroscopy (EIS) and by the scanning vibrating electrode technique (SVET), during immersion in NaCl solutions. The electrochemical results showed that the pre-treatment provides excellent corrosion protection to the substrates. Furthermore, the results evidenced improved protection comparatively to the use of undoped BTESPT pre-treatments, both for galvanised steel and AA2024-T3. This improvement is most likely due to enhanced barrier properties of the film and additional active corrosion protection originated from the inhibiting action of the cerium-based inhibitor impregnated in the silane matrix. |
| Keywords: | AA2024-T3 B Galvanised steel B EIS B SVET B Bis-silane (BTESPT) |
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