Electrochemical and surface analytical study of vinyl-triethoxy silane films on iron after exposure to air

Flis, J.; Kanoza, M.

doi:10.1016/j.electacta.2005.01.065

Cited by 75 publications

(42 citation statements)

References 14 publications

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“…Thus, the contact angle of a well cross-linked coating is on the order of approximately 90°. However, this value becomes smaller after the immersion in an aqueous solution, indicating that the Si-O-Si bond is not stable 21 . Then, due to the fact that these links are not stable, the Si-O-Si reactions can suffer hydrolysis, forming the Si-OH hydrophilic groups again, allowing for water and ions to penetrate and react with the interface 20 .…”

Section: Effect Of Tetraethoxy-silane (Teos) Amounts On the Corrosionmentioning

confidence: 87%

“…Then, due to the fact that these links are not stable Si-O-Si groups can undergo hydrolysis reactions, forming once again hydrophilic Si-OH groups in a way that water and ions can penetrate and react with the interface 20 . Consequently, the silane films temporarily protect the metal, and the film is even more hydrophobic because the barrier and adhesion properties can vary with the time of air or aqueous exposure due to the susceptibility of the Si-O-Si bonds to undergo reactions hydrolysis 21 .…”

Section: Methodsmentioning

confidence: 99%

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Effect of Tetraethoxy-silane (TEOS) Amounts on the Corrosion Prevention Properties of Siloxane-PMMA Hybrid Coatings on Galvanized Steel Substrates

et al. 2015

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Siloxane-poly(methyl methacrylate) (PMMA) organic-inorganic hybrid coatings were deposited on galvanized steel by the dip-coating sol-gel technique. Anticorrosion properties, as well as the morphological, surface and structural features were studied. Hybrid coatings were synthesized from tetraethoxy-silane (TEOS) and methyl methacrylate (MMA) as inorganic and organic phases, respectively, linked by 3-metacriloxypropyl-trimethoxysilane (TMSM) as a coupling agent. The MMA/TMSM ratio was kept constant, whereas the four TEOS/TMSM ratios were varied. The characterization of coatings was assessed using several techniques such as Scanning Electronic Microscopy (SEM), Contact Angle, Fourier Transform Infrared (FT-IR), Open Circuit Polarization (OCP), Atomic Force Microscopy (AFM) and Electrochemical Impedance Spectroscopy measurements (EIS). The EIS results, which were obtained for the hybrid coatings, were discussed based on an electrical equivalent circuit used to adjust the experimental data. The results showed that the increasing the TEOS content caused increase in coating thickness, increased in the surface roughness and increased in the surface hydrophobicity. The film with the highest TEOS content presented the best electrochemical performance, more effective in protecting against corrosion.

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Section: Effect Of Tetraethoxy-silane (Teos) Amounts On the Corrosionmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Effect of Tetraethoxy-silane (TEOS) Amounts on the Corrosion Prevention Properties of Siloxane-PMMA Hybrid Coatings on Galvanized Steel Substrates

et al. 2015

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show abstract

“…Hence, the contact angle of a well-cross linked film is of approximately 90°. However, this value becomes smaller after immersion in an aqueous solution, indicating that the Si-O-Si bond is not stable 20 . Since these links are not stable, the Si-O-Si reactions can suffer from hydrolysis, again forming the Si-OH hydrophilic groups so that water and ions can penetrate and react with the interface 21 .…”

Section: Morphological Characterizationmentioning

confidence: 87%

Hybrid films with (trimethoxysilylpropyl) methacrylate (TMSM), poly (methyl methacrylate) PMMA and tetraethoxysilane (TEOS) applied on tinplate

et al. 2014

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The tetraethoxysilane (TEOS) influences morphological and electrochemical properties of hybrid films by function of concentration. Moreover, the use of acetic acid as a catalyst in the sol enables a more complete hydrolysis of the silane precursors due to the fact that the acetic acid goes through a more complete ionization when in aqueous solution. The aim of this paper is to study the effect of the concentration of tetraethoxysilane (TEOS) on the protective properties of the film on tinplate substrate. The tinplate was coated with a hybrid film obtained from a sol-gel method constituted of the following alkoxide precursors: 3 -(trimetoxisililpropil) methacrylate (TMSM) and poly(methyl methacrylate) PMMA. The effect of tetraethoxysilane (TEOS) concentration has also been evaluated. The films hydrolysis was performed at a pH value of 3.0 using acetic acid as a catalyst. The films were obtained by dip-coating process, cured for 3 hours at 160 °C. The film morphology was evaluated by SEM and profilometry. The electrochemical behavior of the films was evaluated by open circuit potential monitoring, potentiodynamic polarization and electrochemical impedance spectroscopy. The film hydrophobicity was determined by contact angle measurements. The studied films have shown good performance as to corrosion resistance on tinplate. The hybrid film which was obtained through the addition of an excessive amount of TEOS (T3A3) showed increased thickness. Nevertheless, due to an intense densification of the film, promoted by the addition of TEOS, a formation of cracks was registered, thereby compromising the corrosion resistance.

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“…Previous studies have shown that silanes bearing vinyl groups improve the corrosion resistance of aluminum and its alloys [7][8][9][10][11][12], iron [13], galvanized steel [14], and cooper [11]. According to Bajat et al [10], the performance of vinyltriethoxysilane (VTES) films on 99.5 % Al was satisfactory, even in presence of a high concentration of chloride ions (3 % NaCl).…”

Section: Introductionmentioning

confidence: 99%

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

Dalmoro

Santos

Baibich

et al. 2015

Progress in Organic Coatings

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Sol-gel films were prepared using different ratios of two silica precursors, vinyltrimethoxysilane (VTMS) and tetraethylorthosilicate (TEOS), targeting the anticorrosion treatment of aluminum alloy 2024-T3. The electrochemical behavior of the alloy coated with such films, which was studied in a 0.05 mol L -1 NaCl solution, revealed that the VTMS/TEOS ratio drastically affects the anticorrosion performance. Electrochemical impedance spectroscopy (EIS) results provided evidences that the best anticorrosive response occurs with the films prepared from 50% v/v ethanol, 46% v/v water, 3% v/v VTMS and 1% v/v TEOS. Moreover, the effects of the addition of ethylenediamine tetra(methylene phosphonic acid) (EDTPO) to a hybrid sol-gel matrix were examined. The corrosion resistance was considerably improved when the concentration of added phosphonic acid was 3.7510 -5 mol·L -1 . Scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy analyses revealed that EDTPO-containing films provide a more uniform coverage. Results evidenced the formation of Si-O-Al linkages in the VTMS/TEOS and VTMS/TEOS/EDTPO systems and that the VTMS/TEOS/EDTPO system contained P-O-Al linkages. The P-O-Al bonds, combined with the silica network action, may be responsible for the good anticorrosive behavior of the VTMS/TEOS/EDTPO films.

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Electrochemical and surface analytical study of vinyl-triethoxy silane films on iron after exposure to air

Cited by 75 publications

References 14 publications

Effect of Tetraethoxy-silane (TEOS) Amounts on the Corrosion Prevention Properties of Siloxane-PMMA Hybrid Coatings on Galvanized Steel Substrates

Effect of Tetraethoxy-silane (TEOS) Amounts on the Corrosion Prevention Properties of Siloxane-PMMA Hybrid Coatings on Galvanized Steel Substrates

Hybrid films with (trimethoxysilylpropyl) methacrylate (TMSM), poly (methyl methacrylate) PMMA and tetraethoxysilane (TEOS) applied on tinplate

Improving the corrosion performance of hybrid sol–gel matrix by modification with phosphonic acid

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