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Atik, Mohamed; Luna, F Perdomo; Messaddeq, Sandra Helena; Aegerter, Michel A.

doi:10.1023/a:1018310630740

Cited by 12 publications

(18 citation statements)

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“…Much of the initial work concerning corrosion protection offered by sol-gel coatings were conducted using Class I hybrids, in which the inorganic and organic components are bonded by Van der Waals forces [13][14][15]. For example, some of us have shown [14] that the corrosion resistance of stainless steel can be increased by a factor of 30 using Class I hybrid coatings prepared by the dispersion of poly(methyl methacrylate), PMMA, into zirconia (ZrO 2 ) sol.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion protection of stainless steel by polysiloxane hybrid coatings prepared using the sol–gel process

Sarmento

Schiavetto

Hammer

et al. 2010

Surface and Coatings Technology

140

105

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Polysiloxane hybrid films were deposited on 316 L stainless steel substrates by dip-coating in a sol prepared by acid-catalyzed hydrolytic co-polycondensation of tetraethoxysilane (TEOS) and 3-methacryloxy propyltrimethoxysilane (MPTS), followed by radical polymerization of methacrylic moieties. Structural features of the polysiloxane hybrids were studied using 13 C and 29 Si nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA), as a function of the TEOS/ MPTS ratio, which ranged between 0 and 2. The efficiency of corrosion protection of hybrid-coated stainless steel was investigated by X-ray photoelectron spectroscopy (XPS), potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) after immersion of the material in acidic and neutral saline aqueous solutions. The NMR and TGA results indicated a high degree of polymerization and polycondensation (85%) for the hybrid film with a TEOS/MPTS ratio of 2, as well as elevated thermal stability of 410°C and excellent adhesion. The XPS analysis confirmed the hybridized structure of the polysiloxane network, and showed that no corrosion-induced changes had occurred on the coated steel surface after 3 weeks of immersion in 3.5% NaCl solution. Potentiodynamic polarization curves showed that the hybrid coating prepared using a TEOS/MPTS ratio of 2 yielded the best anti-corrosion performance. It acts as an efficient physical barrier, increasing the total impedance and reducing the current densities by 2 orders of magnitude, compared to the bare electrode. The impedance results obtained for the two electrolytes were discussed based on the electrical equivalent circuits used to fit the experimental data.

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Section: Introductionmentioning

confidence: 99%

“…13 C MAS/NMR spectra of the polysiloxane hybrids prepared with TEOS/MPTS ratios of 0 (P0), 1 (P1) and 2 (P2).…”

mentioning

confidence: 99%

Corrosion protection of stainless steel by polysiloxane hybrid coatings prepared using the sol–gel process

Sarmento

Schiavetto

Hammer

et al. 2010

Surface and Coatings Technology

140

105

View full text Add to dashboard Cite

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“…[1][2][3][4][5][6][7] The classical sol-gel principle is the creation of a solid oxide network by progressive reactions (hydrolysis and condensation) of a molecular precursor in a liquid medium. [19][20][21] Indeed, sol-gel coatings are formed from a colloid by evaporation of the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Influence of sol–gel application conditions on metallic substrate for optical applications

Druart

Richir

Poirier

et al. 2011

Corrosion Engineering, Science and Technology

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An efficient energy management of a building requires optimum use of the light energy, which is strongly dependent on optical properties of used materials. In the lighting sector, aluminium is generally employed as substrate for the reflectors. Nowadays, new steel substrates combining good corrosion resistance and flexibility are developed to answer the growing need of this market. Specific requirements for optical applications are a high reflectivity (total reflectivity .82%), a high superficial hardness and durability and also a suitable formability. The sol-gel layer is used in this particular application for its levelling properties before depositing of the reflective layer and good barrier properties to avoid contact between the metallic layers. The corrosion protection and the barrier properties of the sol-gel layer are investigated as a function of the thickness. The protection conferred by the sol-gel layer on stainless steel substrate is studied by the electrochemical measurements in a sodium chloride solution (electrochemical impedance spectroscopy and polarisation curves). The stress generated in the layer is determined versus temperature, humidity and hygrothermal conditions.

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“…Depending on the properties of the end-product, filmogen hybrids can be further used as waveguide materials with either nonlinear 1 or photochromic 11 properties, conducting films 6 membranes, 7,10 contact lenses, 15 and anticorrosive coatings. 16 In what concerns the special case of cationic polymers, they are interesting candidates for organicinorganic preparations since electrostatic interactions can strengthen the links between the reaction partners. Moreover, several cationic polymers were shown to have antibacterial activity.…”

Section: Introductionmentioning

confidence: 99%

Filmogen organic–inorganic hybrids obtained by sol–gel in the presence of cationic polymer

Donescu

Şerban

Uricanu

et al. 2007

J of Applied Polymer Sci

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Self-standing and coated-on-glass films were prepared from polymer-inorganic ormosils, using the cationic polymer poly(methacrylamide propyl quaternarydimethyldodecyl bromide). The inorganic compound was grown in sol-gel reactions based on methyltriethoxysilane (MeTES), with or without addition of the titanium-precursor: tetraisopropyl orthotitanate. As evidenced by thermogravimetric analysis and differential scanning calorimetry data, the thermal properties of the films are highly dependent on the internal morphology. Inorganic granules with a TiO 2 rich shell have a more polar surface, which stimulates stronger electrostatic interactions with the polymer, hence, a reduced mobility for the amino end and a smaller probability to have amino ends engaged in interactions at the surface of the granules. Coated-on-glass films drawn from pure cationic polymer suffer from partial dewetting. Topographic and force-versus-distance recordings using atomic force microscopy showed a change in the energy balance and no dewetting regions were encountered for polymer/MeTES based composites. However, because of nongrafted polymer, these films are not immune at washing with water/ acetone. Explorations of antibacterial activity against the gram-negative bacteria, Pseudomonas aeruginosa, were done using ormosil films with alkoxysilanes combinations.

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Cited by 12 publications

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Corrosion protection of stainless steel by polysiloxane hybrid coatings prepared using the sol–gel process

Corrosion protection of stainless steel by polysiloxane hybrid coatings prepared using the sol–gel process

Influence of sol–gel application conditions on metallic substrate for optical applications

Filmogen organic–inorganic hybrids obtained by sol–gel in the presence of cationic polymer

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