Chitosan-doped-hybrid/TiO2 nanocomposite based sol-gel coating for the corrosion resistance of aluminum metal in 3.5% NaCl medium
| Autor: | M G Sethuraman, J Balaji |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Biochemistry Corrosion chemistry.chemical_compound X-ray photoelectron spectroscopy Coating Structural Biology Molecular Biology Sol-gel Nanocomposite Metallurgy General Medicine 021001 nanoscience & nanotechnology Silane 0104 chemical sciences chemistry engineering 0210 nano-technology Titanium Nuclear chemistry |
| Zdroj: | International Journal of Biological Macromolecules. 104:1730-1739 |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2017.03.115 |
| Popis: | The study outlines the role of chitosan, a biopolymer on corrosion behavior of Hy/nano-TiO2 based sol-gel coating over aluminum metal. In this study organic-inorganic hybrid sols were synthesized through hydrolysis and condensation of 3-glycidoxypropyltrimethoxy silane (GPTMS), tetraethoxysilane (TEOS) and titanium (IV) isopropoxide (TIP) in acidic solution. Chitosan was doped into sol-gel matrix and self-assembled over aluminum substrate. The resultant chitosan-doped-Hy/nano-TiO2 sol-gel coating was characterized by Fourier Transform Infrared (FT-IR) spectra, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Energy-Dispersive X-ray Spectroscopy (EDX) analyses. The as-tailored aluminum substrate was evaluated for corrosion resistance in neutral medium. The protection ability of these coatings was evaluated by electrochemical impedance studies (EIS) and potentiodynamic polarization (PP) measurements in 3.5% NaCl medium. The EIS and PP results showed that chitosan-doped- Hy/nano-TiO2 sol-gel coating exhibited better protection from corrosion than the undoped Hy/TiO2 nanocomposite coating. |
| Databáze: | OpenAIRE |
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