The characteristics of siloxane-PMMA hybrid films permit the obtaining of coatings with thickness of few microns without cracking. Besides, the methacrylate groups (MMA) can be easily polymerizated by UV irradiation or thermal treatments. These hybrids can also be applied in anti-corrosive coatings for metals and alloys, replacing chromates which exhibit high toxicity. In this context, the aim of this work is to study the behavior of tinplate coated with a siloxane-PMMA hybrid film by dip-coating process and cured by thermal cure process. The systems were characterized by electrochemical, morphological and physicochemical analysis. Preliminary results showed that the systems studied presented a regular and adherent siloxane-PMMA hybrid film, which increased the corrosion resistance of tinplate substrates.
The decrease in the effectiveness of current treatments for hair dermatosis caused by the resistance to antifungals affects patients, causing many cases of recurrence. Thus, the search for low-cost materials...
The aim of this work is to characterize by electrochemical, physicochemical and morphological analysis the hybrid films applied on galvanized steel by dip-coating process. Preliminaries studies showed that a monolayer of silane is not enough to increase the corrosion resistance protection of the substrate. In this context, the galvanized steel was coated with a double and triple layer of hybrid film obtained from a sol constituted by silane precursors 3 - (trimetoxisililpropil) methacrylate (TMSPMA) and tetraethoxysilane (TEOS) with addition of cerium nitrate at a concentration of 0.01M. The hybrid films were cured for 20 minutes at 60°C in each application of the film. The results showed that a double and triple layer of hybrid film increase the barrier effect contributing to corrosion protection of galvanized steel.
Due to the environment and economical questions, the use of cadmium coatings, in the aeronautical and automotive industries, has been prohibited. In this context, ZnNi coating alloys have been propose to replace cadmium coatings due to its properties. However, in order to postpone the corrosion of ZnNi alloy, hybrids films obtained by sol-gel process have been studied. In this work, hybrids films were obtained on ZnNi coating by dip-coating process from a sol constituted of alkoxide precursors: γ-methacryloxypropyl-trimethoxysilane and tetraethoxysilane with cerium nitrate addition (0.01 M). Two withdrawal speeds of substrates from the sol were applied: 5 cm.min-1 and 10 cm.min-1 .The films obtained were evaluated by morphological (SEM and AFM) and electrochemical characterization. The superior corrosion protection performance was observed for the ZnNi/hybrid film system obtained with withdrawal speed of 10 cm.min-1, thought, the presence of discontinuities were observed in this film.
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