Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO<sub>2</sub> NPs and Fluorinated Chains for Aluminum Alloys Protection
In this work, layers of a sol-gel hybrid matrix doped with metal oxide nanoparticles (TiO<sub>2</sub> 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 proper...
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MDPI AG
2018-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/8/12/1076 |
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| author | Pedro J. Rivero Juan Deyo Maeztu Calos Berlanga Adrian Miguel José F. Palacio Rafael Rodriguez |
| author_facet | Pedro J. Rivero Juan Deyo Maeztu Calos Berlanga Adrian Miguel José F. Palacio Rafael Rodriguez |
| author_sort | Pedro J. Rivero |
| collection | DOAJ |
| description | In this work, layers of a sol-gel hybrid matrix doped with metal oxide nanoparticles (TiO<sub>2</sub> 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 TiO<sub>2</sub> 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 TiO<sub>2</sub> 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 TiO<sub>2</sub> 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. |
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| last_indexed | 2024-12-22T15:57:05Z |
| publishDate | 2018-12-01 |
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| spelling | doaj.art-a9bac6e480f5463ca237cadf5298ad1b2022-12-21T18:20:47ZengMDPI AGMetals2075-47012018-12-01812107610.3390/met8121076met8121076Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO<sub>2</sub> NPs and Fluorinated Chains for Aluminum Alloys ProtectionPedro J. Rivero0Juan Deyo Maeztu1Calos Berlanga2Adrian Miguel3José F. Palacio4Rafael Rodriguez5Materials Engineering Laboratory, Department of Engineering, Public University of Navarre, Campus Arrosadía S/N, 31006 Pamplona, SpainMaterials Engineering Laboratory, Department of Engineering, Public University of Navarre, Campus Arrosadía S/N, 31006 Pamplona, SpainMaterials Engineering Laboratory, Department of Engineering, Public University of Navarre, Campus Arrosadía S/N, 31006 Pamplona, SpainCentre of Advanced Surface Engineering, AIN, 31191 Cordovilla, SpainCentre of Advanced Surface Engineering, AIN, 31191 Cordovilla, SpainMaterials Engineering Laboratory, Department of Engineering, Public University of Navarre, Campus Arrosadía S/N, 31006 Pamplona, SpainIn this work, layers of a sol-gel hybrid matrix doped with metal oxide nanoparticles (TiO<sub>2</sub> 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 TiO<sub>2</sub> 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 TiO<sub>2</sub> 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 TiO<sub>2</sub> 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.https://www.mdpi.com/2075-4701/8/12/1076sol-gel hybrid matrixTiO<sub>2</sub> NPscorrosion resistancehydrophobicity |
| spellingShingle | Pedro J. Rivero Juan Deyo Maeztu Calos Berlanga Adrian Miguel José F. Palacio Rafael Rodriguez Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO<sub>2</sub> NPs and Fluorinated Chains for Aluminum Alloys Protection Metals sol-gel hybrid matrix TiO<sub>2</sub> NPs corrosion resistance hydrophobicity |
| title | Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO<sub>2</sub> NPs and Fluorinated Chains for Aluminum Alloys Protection |
| title_full | Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO<sub>2</sub> NPs and Fluorinated Chains for Aluminum Alloys Protection |
| title_fullStr | Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO<sub>2</sub> NPs and Fluorinated Chains for Aluminum Alloys Protection |
| title_full_unstemmed | Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO<sub>2</sub> NPs and Fluorinated Chains for Aluminum Alloys Protection |
| title_short | Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO<sub>2</sub> NPs and Fluorinated Chains for Aluminum Alloys Protection |
| title_sort | hydrophobic and corrosion behavior of sol gel hybrid coatings based on the combination of tio sub 2 sub nps and fluorinated chains for aluminum alloys protection |
| topic | sol-gel hybrid matrix TiO<sub>2</sub> NPs corrosion resistance hydrophobicity |
| url | https://www.mdpi.com/2075-4701/8/12/1076 |
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