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

Abstract

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.

Bio-Based Coatings for Food Metal Packaging Inspired in Biopolyester Plant Cutin

“…The WCA were sensitive to many factors, mainly to surface chemical composition and roughness. The values observed for bare supports were 65° for Al and around 80° for TFS and ETP, which were comparable to those reported in the literature [35][36][37][38][39]. After coating, the initial WCA (WCAo) value increased slightly, i.e., about 6°…”

Improved corrosion resistant and mechanical behavior of distinct composite coatings (silica/titania/zirconia) on Ti–6Al–4V deposited by EPD

“…The existence of active hydroxyl in SiO 2 repeatedly reunited to form sizeable aggregates and produces the above typical properties in a coating [19]. In a previous study by Kunst et al [20], higher amount of TEOS in a hybrid film was found to produce more roughness and led to very thin coating on deposition. Further, Surowska and Bienias [21] have studied the development of micro- cracks on the sol-gel deposited SiO 2 /TiO 2 coating on Ti-6Al-4V, they explained about the presence of non-homogeneous, less compact film over the substrate.…”

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.…”