Chitosan-doped-hybrid/TiO2nanocomposite based sol-gel coating for the corrosion resistance of aluminum metal in 3.5% NaCl medium.
The study outlines the role of chitosan, a biopolymer on corrosion behavior of Hy/nano-TiO2based 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-TiO2sol-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-TiO2sol-gel coating exhibited better protection from corrosion than the undoped Hy/TiO2nanocomposite coating.
Department of Chemistry, Gandhigram Rural Institute - Deemed University, Gandhigram 624 302, Tamil Nadu, India.
Balaji
B
J
Department of Chemistry, Gandhigram Rural Institute - Deemed University, Gandhigram 624 302, Tamil Nadu, India. Electronic address: mgsethu@rediffmail.com.
Sethuraman
S
M G
D000535:Aluminum / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D003343:Corrosion; D005782:Gels; D053761:Nanocomposites / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D005782:Gels; C009495:titanium dioxide; D012965:Sodium Chloride; D048271:Chitosan; D000535:Aluminum; D014025:Titanium
Chitosan; Corrosion; Hybrid; Sol-Gel; TiO(2)