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Carbon nanotube-reinforced siloxane-PMMA hybrid coatings with high corrosion resistance
Universidade Estadual Paulista (UNESP)
Siloxane-polymethyl methacrylate hybrid films containing functionalized multiwall carbon nanotubes (CNTs) were deposited by dip-coating on carbon steel substrates from a sol prepared by radical polymerization of methyl methacrylate and 3-methacryloxy propyl-trimethoxysilane, followed by hydrolytic co-polycondensation of tetraethoxysilane. The correlation between the structural properties and corrosion protection efficiency was studied as a function of the molar ratio of nanotubes carbon to silicon, varied in the range between 0.1% and 5%. 29Si nuclear magnetic resonance and thermogravimetric measurements have shown that hybrids containing carbon nanotubes have a similar degree of polycondensation and thermal stability as the undoped matrix and exhibit and excellent adhesion to the substrate. Microscopy and X-ray photoelectron spectroscopy results revealed a very good dispersion of carbon nanotubes in the hybrid matrix and the presence of carboxylic groups allowing covalent bonding with the end-siloxane nodes. Potentiodynamic polarization curves and electrochemical impedance spectroscopy results demonstrate that CNTs containing coatings maintain the excellent corrosion protection efficiency of the hybrids, showing even a superior performance in acidic solution. The nanocomposite structure acts as efficient corrosion barrier, increasing the total impedance by 4 orders of magnitude and reducing the current densities by more than 3 orders of magnitude, compared to the bare steel electrode. © 2013 Elsevier B.V. All rights reserved.
Issue Date: 
Progress in Organic Coatings, v. 76, n. 4, p. 601-608, 2013.
Time Duration: 
  • Carbon nanotubes
  • Corrosion protection
  • Electrochemical properties
  • Hybrid coatings
  • Photoelectron spectroscopy
  • Sol-gel process
  • Acidic solutions
  • Bare steel
  • Carbon steel substrates
  • Carboxylic group
  • Corrosion barriers
  • Covalent bonding
  • Dip coating
  • Functionalized
  • Hybrid coating
  • Hybrid film
  • Hybrid matrix
  • Molar ratio
  • Nano-composite structure
  • Orders of magnitude
  • Polymerization of methyl methacrylate
  • Potentiodynamic polarization curves
  • Protection efficiency
  • Similar degree
  • Thermogravimetric measurement
  • Carbon steel
  • Coatings
  • Corrosion resistance
  • Electrochemical impedance spectroscopy
  • Esters
  • Photoelectrons
  • Polycondensation
  • Polymethyl methacrylates
  • Sols
  • Substrates
  • X ray photoelectron spectroscopy
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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