Investigation of the microstructure and corrosion performance of a nanostructured titania-containing hybrid silicate film on mild steel |
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Authors: | Sayed Morteza Madani Hassan Hashemipour Rafsanjani |
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Affiliation: | a Department of Materials Science and Engineering, Shahid Bahonar University, PO Box 76175-133, Islamic Republic Blvd., Kerman, Iranb Department of Chemical Engineering, Shahid Bahonar University, PO Box 76175-133, Islamic Republic Blvd., Kerman, Iran |
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Abstract: | A pre-treatment system consisting of a nanostructured titania interlayer loaded with an inhibitor and a hybrid silicate film deposited on the TiO2 layer is shown to provide protection against active corrosion of mild steel. A nanostructured TiO2 interlayer was prepared on the mild steel surface via controllable hydrolysis of titanium alkoxide. To further improve this pre-treatment, the hybrid silicate film was synthesized from tetraethylorthosilicate and 3-glycidoxypropyltrimethoxysilane precursors. The morphology and structure of the titania interlayer and hybrid silicate film were characterized with atomic force microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy techniques. The corrosion performance of the coatings was examined using electrochemical techniques, including potentiodynamic scanning and electrochemical impedance spectroscopy. The TiO2 nanostructure calcinated/inhibitor/hybrid silicate system shows enhanced corrosion performance, as confirmed by impedance and polarization measurements. |
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Keywords: | Nanostructured films Titania Silicate Hybrid films Corrosion inhibitor Electrochemical impedance spectroscopy Scanning election microscopy Electron diffraction spectroscopy |
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