Hydrophobic and corrosion behavior of sol-gel hybrid coatings based on the combination of TiO2 NPs and fluorinated chains for aluminum alloys protection
| Autor: | Rafael Rodríguez, José F. Palacio, Adrian Miguel, Pedro J. Rivero, Juan Deyo Maeztu, Calos Berlanga |
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| Přispěvatelé: | Universidad Pública de Navarra. Departamento de Ingeniería, Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa. INAMAT2 - Institute for Advanced Materials and Mathematics, Nafarroako Unibertsitate Publikoa. Ingeniaritza Saila, Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, Navarre-PRO-UPNA18-6107-FRRRIO, Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa. InaMat - Institute for Advanced Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
lcsh:TN1-997
Materials science Scanning electron microscope Alloy Hydrophobicity Corrosion resistance 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Indentation hardness Corrosion Contact angle Coating TiO2 NPs General Materials Science lcsh:Mining engineering. Metallurgy Sol-gel Sol-gel hybrid matrix Metals and Alloys technology industry and agriculture 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy Chemical engineering engineering 0210 nano-technology |
| Zdroj: | Metals Volume 8 Issue 12 Academica-e. Repositorio Institucional de la Universidad Pública de Navarra instname Academica-e: Repositorio Institucional de la Universidad Pública de Navarra Universidad Pública de Navarra Metals, Vol 8, Iss 12, p 1076 (2018) |
| Popis: | In this work, layers of a sol-gel hybrid matrix doped with metal oxide nanoparticles (TiO2 NPs) have been deposited on flat samples of AA6061-T6 aluminum alloy using the dip-coating technique, with the aim of obtaining coatings with better anti-corrosive and hydrophobic properties. Two different organic modified silica alkoxides, namely 3-(glycidyloxypropyl)trimethoxysilane (GPTMS) and methyltriethoxysilane (MTEOS), have been used for an adequate entrapment of the metal oxide nanoparticles. In addition, a fluorinated metal-alkoxide precursor has also been added to the hybrid matrix in order to improve the hydrophobic behavior. The experimental results corroborate that the presence of these TiO2 NPs play an important role in the development of the sol-gel hybrid coatings. The water contact angle (WCA) measurements, as well as pencil hardness tests indicate that TiO2 NPs make a considerable increase in the resultant hydrophobicity possible, with better mechanical properties of the coatings. The coating thickness has been measured by cross-section scanning electron microscopy (SEM). In addition, a glow discharge optical emission spectroscopy (GD-OES) analysis has been carried out in order to corroborate the adequate entrapment of the TiO2 NPs into the sol-gel coatings. Finally, potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) have been performed in order to evaluate the corrosion resistance of the coatings. All the results provide insights into the efficacy of the developed sol-gel hybrid coatings for anticorrosive purposes with good mechanical properties. This research was funded by Public University of Navarre and the APC was funded by Project PRO-UPNA18-6107-FRRRIO. |
| Databáze: | OpenAIRE |
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