Abstract
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.
Highlights
Galvanized steel is one of the most commonly used metallic materials for industrial applications against corrosion
The presence of cracks on the hybrid films was observed with higher polyethylene glycol (PEG) concentrations of 40 and 60 g.L-1, which correspond, respectively, to the F2P90 and F3P90 systems
The system F1P90 (Figure 3b), which presents the lowest PEG concentration (20 g.L-1), apparently has enough of the plasticizer incorporated in the hybrid film to promote the elaboration of a regular and uncracked film
Summary
Galvanized steel is one of the most commonly used metallic materials for industrial applications against corrosion This anticorrosion protection can be enhanced from the use of coatings. Hybridization is a creative alternative to the design of new materials and offers unique opportunities to develop innovative industrial applications[4]. These materials combine the hardness, wear resistance and thermal stability of the ceramic component with the flexibility, transparency and tunable adhesion of the organic materials[5,6,7,8,9,10,11]. The sol-gel method allows to control the synthesis of multifunctional hybrid materials, where the organic, inorganic and, in some cases, biological constituents are mixed at a nanometer scale[12,13,14,15,16]
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