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

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.

High-Performance Adhesives Based on Maleic Anhydride-g-EPDM Rubbers and Polybutene for Laminating Cast Polypropylene Film and Aluminum Foil

“…The -Si-O peak at 1000 cm −1 is attributed to the formation of an Si-O-Si network resulting from the silanization of APTES. The peaks at 3500 cm −1 (-OH of silanol) and 920 cm −1 (Si-O-Et of APTES) provide some evidence for the incomplete hydrolysis and silanization of APTES; however, the formation of Si-O-Si networks on the Al surface, as demonstrated by the FT-IR spectra, suggest that most of APTES participated in the treatment [53]. The highly reactive -NH 2 group of APTES, which persists even after the treatment process on Al foil, provide chemically active sites for reaction with the MAH groups of MAH-g-EPDM rubbers.…”

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

“…The tetraethoxysilane (TEOS) is a commonly silane used to form films that protect the metal of the corrosive attack. According to several authors 10,[12][13][14][15][16][17] the TEOS based hybrids film forms an homogeneous, compact and resistant physical barrier. These hybrid films protect and assure the integrity of metal substrates in corrosive media.…”

Electrochemical and Mechanical Behavior of Aluminum Aa2024-T3 Coated With Hybrid Matrix Containing Graphene Oxide

“…Furthermore, information about diffusion process and charge transfer in the interface metal / coating can be obtained [33,34]. EIS can be used to study films with high corrosion resistance, for which the polarization curve method is limited, or as a complementary technique that enables advances in corrosion science [35].…”