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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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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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Título Characterization of siloxane-poly(methyl methacrylate) hybrid films obtained on a tinplate substrate modified by the addition of organic and inorganic acids
Autor Kunst, Sandra Raquel
Beltrami, Lílian Vanessa Rossa
Cardoso, Henrique Ribeiro Piaggio
Santana, Joseane de Andrade
Sarmento, Victor Hugo Vitorino
Muller, Iduvirges Lourdes
Malfatti, Célia de Fraga
Abstract 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.
Contido em Materials research : ibero-american journal of materials. São Carlos, SP. Vol. 18, no. 1 (Jan./Feb. 2015), p. 151-163
Assunto Corrosao
Filmes híbridos
Folha de flandres
[en] Acid hydrolysis
[en] EIS
[en] Hybrid organic–inorganic films
[en] TEOS
[en] Tinplate
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/147570
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