dc.contributor | Universidade Estadual Paulista (Unesp) | |
dc.date.accessioned | 2014-05-27T11:28:45Z | |
dc.date.accessioned | 2022-10-05T18:46:49Z | |
dc.date.available | 2014-05-27T11:28:45Z | |
dc.date.available | 2022-10-05T18:46:49Z | |
dc.date.created | 2014-05-27T11:28:45Z | |
dc.date.issued | 2013-04-01 | |
dc.identifier | Progress in Organic Coatings, v. 76, n. 4, p. 601-608, 2013. | |
dc.identifier | 0300-9440 | |
dc.identifier | http://hdl.handle.net/11449/74940 | |
dc.identifier | 10.1016/j.porgcoat.2012.11.015 | |
dc.identifier | WOS:000316425000012 | |
dc.identifier | 2-s2.0-84874106317 | |
dc.identifier | 6466841023506131 | |
dc.identifier | 9971202585286967 | |
dc.identifier | 5584298681870865 | |
dc.identifier | 0000-0002-3823-0050 | |
dc.identifier | 0000-0002-8356-8093 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/3923890 | |
dc.description.abstract | 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. | |
dc.language | eng | |
dc.relation | Progress in Organic Coatings | |
dc.relation | 2.955 | |
dc.relation | 0,844 | |
dc.rights | Acesso restrito | |
dc.source | Scopus | |
dc.subject | Carbon nanotubes | |
dc.subject | Corrosion protection | |
dc.subject | Electrochemical properties | |
dc.subject | Hybrid coatings | |
dc.subject | Photoelectron spectroscopy | |
dc.subject | Sol-gel process | |
dc.subject | Acidic solutions | |
dc.subject | Bare steel | |
dc.subject | Carbon steel substrates | |
dc.subject | Carboxylic group | |
dc.subject | Corrosion barriers | |
dc.subject | Covalent bonding | |
dc.subject | Dip coating | |
dc.subject | Functionalized | |
dc.subject | Hybrid coating | |
dc.subject | Hybrid film | |
dc.subject | Hybrid matrix | |
dc.subject | Molar ratio | |
dc.subject | Nano-composite structure | |
dc.subject | Orders of magnitude | |
dc.subject | Polymerization of methyl methacrylate | |
dc.subject | Potentiodynamic polarization curves | |
dc.subject | Protection efficiency | |
dc.subject | Similar degree | |
dc.subject | Thermogravimetric measurement | |
dc.subject | Carbon steel | |
dc.subject | Coatings | |
dc.subject | Corrosion resistance | |
dc.subject | Electrochemical impedance spectroscopy | |
dc.subject | Esters | |
dc.subject | Photoelectrons | |
dc.subject | Polycondensation | |
dc.subject | Polymethyl methacrylates | |
dc.subject | Sols | |
dc.subject | Substrates | |
dc.subject | X ray photoelectron spectroscopy | |
dc.title | Carbon nanotube-reinforced siloxane-PMMA hybrid coatings with high corrosion resistance | |
dc.type | Artigo | |