Effect of cerium (IV) ions on the anticorrosion properties of siloxane-poly(methyl methacrylate) based film applied on tin coated steel

Suegama, P. H.; Sarmento, Víctor Hugo Vitorino; Montemor, M.F.; Benedetti, Assis Vicente; Melo, Hercílio Gomes de; Aoki, Idalina Vieira; Santilli, Celso Valentim

doi:10.1016/j.electacta.2010.04.002

Cited by 52 publications

(65 citation statements)

References 53 publications

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“…These results are related to the interaction of the electrolyte with the coating, such as its permeation through the coating, which is not an instantaneous process. Other authors 22,31 have found the same results and only present EIS data after some hours of immersion.…”

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

confidence: 47%

“…However, when there is a perfect synergistic effect in the formulation, there is a greater formation of covalent bonds, and consequently, a greater cross-linking and a greater hydrophobicity of the system, as depicted in the T3 sample. Besides during the curing process, hydrophobic siloxane bonds are formed in the film network, which hinder water penetration 31 . Figure 7 and Table 4 shows the FT-IR spectra obtained for all of the reviewed coatings.…”

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 Corrosionsupporting

confidence: 47%

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

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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“…These results are related to the interaction of the electrolyte with the film, such as the permeation of the electrolyte through the film, which is not an instantaneous process. Other authors 30,39 have found the same results and only present EIS data after some hours of immersion. The percent errors shown in brackets in Tables 4 shows that the errors involved in the fitting procedure were less than 10% in some cases and less than 5% in most cases.…”

Section: New Sol-gel Formulations To Increase the Barrier Effect Of Asupporting

confidence: 47%

New Sol-gel Formulations to Increase the Barrier Effect of a Protective Coating Against the Corrosion and Wear of Galvanized Steel

et al. 2015

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This study proposes a new pretreatment method that uses alkoxide precursors with a plasticizing agent; the purpose of this study is to improve the electrochemical and mechanical properties of a galvanized steel surface. Galvanized steel was covered with a hybrid film obtained from a sol that consisted of two alkoxide precursors, 3 -(trimethoxysilylpropyl) methacrylate (TMSM) and tetraethoxysilane (TEOS), with nitrate cerium in a concentration of 0.01 M and a polyethylene glycol (PEG) plasticizer. The hybrid coatings were obtained by dip-coating method with various concentrations of plasticizer (0, 20, 40 and 60 g.L -1 ). The hybrid films were analyzed by scanning electron microscopy (SEM), profilometry, contact angle measurements, a tribometer with the type-setting ball on the plate and electrochemical tests. The addition of the plasticizer into the hybrid films improves the corrosion resistance behavior compared to the sample without the plasticizer. The addition of 20 g.L -1 of plasticizer showed the best performance in the electrochemical tests. The mechanical behavior results indicated that higher PEG concentrations resulted in films with enhanced durability.

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“…These hybrid films improve the corrosion resistance 9 and adhesion of organic layers, and they also reduce the environmental impact compared to the chromatization process 10 . Siloxane-PMMA hybrid films have been found to promote excellent anchorage on the tinplate surface [11][12][13] for subsequent paint application 14 . Sol-gel films provide excellent adhesion to the substrate and a suitable protection against corrosion by creating a chemically inert barrier between the metal and aggressive environments.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Siloxane-poly(methyl methacrylate) Hybrid Films Obtained on a Tinplate Substrate Modified by the Addition of Organic and Inorganic Acids

et al. 2015

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Tinplate is used to food packaging and other types of packages. The corrosion resistance of the tinplate has been study due the necessity of an alternative to high environmental impact of chromatization process. Therefore protective coatings as hybrid films base elaborations with different acids are studied to improve the barrier effect against corrosion. The objective of this work is characterize hybrid films deposited on a tinplate from a sol made up of the alkoxide precursors 3-(trimethoxysilylpropyl) methacrylate (TMSM), tetraethoxysilane (TEOS) and poly(methyl methacrylate) (PMMA) together with one of three acids (acetic, hydrochloric or nitric acid) and to verify their action against the corrosion of the substrate. The films were obtained by a dip-coating process and cured for 3 hours at 160 °C. The film hydrophobicity was determined by contact angle measurements, and the morphology was evaluated by SEM. FTIR measurements were performed to characterize the chemical structures of the films. The electrochemical behavior of the coatings was evaluated by techniques open circuit potential monitoring (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results demonstrate that the siloxane-PMMA films improve the protective properties of the tinplate, with the films obtained by acetic acid addition exhibiting the greatest improvement.

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Effect of cerium (IV) ions on the anticorrosion properties of siloxane-poly(methyl methacrylate) based film applied on tin coated steel

Cited by 52 publications

References 53 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

New Sol-gel Formulations to Increase the Barrier Effect of a Protective Coating Against the Corrosion and Wear of Galvanized Steel

Characterization of Siloxane-poly(methyl methacrylate) Hybrid Films Obtained on a Tinplate Substrate Modified by the Addition of Organic and Inorganic Acids

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