A comparative study of molybdate/silane composite films on galvanized steel with different treatment processes

Kong, Gang; J, Lu; Zhang, Shuanghong; Che, Chunshan; Wu, Haijiang

doi:10.1016/j.surfcoat.2010.07.033

Cited by 54 publications

(33 citation statements)

References 19 publications

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“…Furthermore, the possibility to obtain thicker coatings, free of cracks, is due to the stability of poly (methyl methacrylate), PMMA, and due to the ease of polymerization of methacrylate groups (MMA), by UV radiation, or by thermal treatments which help to increase the refractive index 18,19 . Among the current deposition technologies used for the application of these coatings, the dip-coating process has stood among the others due to its various advantages 1,18 . In this context, the present work consists in studying galvanized steel coated with a siloxane-PMMA organic-inorganic hybrid film using the dip-coating process.…”

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

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: 99%

“…Hot-dip galvanizing technique has been in practice for over a century as it can protect steel products from atmospheric corrosion in an effective and economic way 1 . Moreover, the excellent anti-corrosive behavior of chromate films is well known.…”

Section: Introductionmentioning

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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“…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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“…And passivation treatments are needed to improve corrosion resistance. Several alternative conversion treatments were investigated to develop non-hazardous and easy implementation were studied to replace the chromate for its toxicity (e.g., see Kong, 2010, p. 545-550, and Aramaki, 2001, p. 2201-2215.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Corrosion Resistance of Silane Film Modified with SiO2 Nano-Particles on Zinc Coatings

Gu¹,

Zhang²,

Zhong³

et al. 2017

dtmse

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The present work investigated the electrochemical behavior of zinc plate treated with 3-(Aminopropyl)triethoxysilane, 3-(Trimethoxysilyl)propyl methacrylate solutions containing TiF62-, ZrF62-and modified with different concentrations of nano-particles. The morphologies of passivation films before and after immersion were characterized by scanning electron microscopy (SEM). Complementary studies were carried out with electrochemical impedance spectroscopy (EIS) and neutral salt spray test (NSS). The result showed that there are a layer of continuous and uniform film on the surface of substrate, and the film kept stable during the early period of immersion. The scanning electrochemical microscopy together with EIS showed that the anticorrosion ability increased with the rise of SiO2 nano-particles concentration, which leaded to enhanced resistance in return by higher density of corrosion.

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A comparative study of molybdate/silane composite films on galvanized steel with different treatment processes

Cited by 54 publications

References 19 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

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

Evaluation of Corrosion Resistance of Silane Film Modified with SiO2 Nano-Particles on Zinc Coatings

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