The use of coatings based on alkoxysilanes is one of the most effective ways to control the release of cytotoxic ions by metal implants. To improve the success rate of titanium–aluminum–vanadium implants, in this study, we evaluated the physicochemical, morphological, mechanical, and electrochemical behavior of hybrid coatings based on alkoxysilanes applied on the alloy. The coatings were prepared with the precursors 3‐(trimethoxysilyl propyl)methacrylate and tetraethoxysilane alkoxides by the sol–gel method. The curing of the coatings was evaluated at different temperatures (90, 180, and 300 °C) for 1 h. We carried out the pretreatment of the alloy by polishing and attacking it with sodium hydroxide. The results indicate that the temperature of 90 °C was effective for solvent evaporation and complete crosslinking of the film, and the alkaline pretreatment allowed the formation of a film with better anticorrosive performance; this indicated that the presence of hydroxyl groups on the surface improved the coating adhesion. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45470.

No abstract

ResumoO objetivo deste estudo é analisar a influência de diferentes pré-tratamentos de superfície (fosfato, nanocerâmico e silano) na resistência à corrosão do aço AISI 1008, visando uma posterior aplicação da tinta poliéster. Os pré-tratamentos foram depositados sobre o substrato de maneira distinta. O fosfato teve sua aplicação em escala industrial por meio de pulverização em um sistema onde o desengraxe foi realizado ao mesmo estágio da fosfatização. No nanocerâmico utilizou-se o método por imersão com pH controlado em torno de 4,5 em uma solução de ácido hexafluorzircônio. Para o silano utilizou-se o método de dip-coating, para a aplicação dos precursores tetraetoxisilano (TEOS) e 3-(trimetóxisililpropil) metacrilato (MPTS) pré-hidrolizados. As amostras pré-tratadas foram caracterizadas quanto ao comportamento morfológico e eletroquímico. Após a aplicação de tinta poliéster, as amostras foram avaliadas quanto ao seu comportamento mecânico. Os resultados das análises para os pré-tratamentos superficiais e para os sistemas pré-tratamentos + tinta mostraram que o silano apresentou a melhor resistência à corrosão em relação ao sistema nanocerâmico e fosfatização. Palavras-chave: Fosfatização; Silano; Nanocerâmicos; Tinta poliéster; Corrosão. INFLUENCE OF THREE SURFACE PRE-TREATMENTS WITH SUBSEQUENT APPLICATION OF POLYESTER INK IN CORROSION RESISTANCE OF AISI 1008 STEEL AbstractThe objective of this study was to analyze the influence of different surface pre-treatments (phosphate, nano-ceramic and silane) on the corrosion resistance of AISI 1008 steel, with a view to the subsequent application of polyester ink. The pre-treatments were deposited on the substrate in distinct ways. Phosphate was applied on an industrial scale by spraying in a system where degreasing was carried out at the same stage of phosphating. In the nano-ceramic pre-treatment the immersion method was used, with controlled pH of about 4.5 in a solution of hexafluorzirconium acid. For the silane pre-treatment the dip-coating method was used for the application of pre-hydrolysed tetraethoxysilane (TEOS) and 3-(trimethylsilylpropyl) methacrylate (MPTS) precursors. The pre-treated samples were characterized for morphological and electrochemical behavior. After the application of polyester ink, the samples were evaluated for their mechanical behavior. The results for the surface pre-treatments and for the pre-treatment + ink systems showed that silane presented the best corrosion resistance amongst the tested pre-treatments.

The objective of this work is to coat tinplate with a hybrid film obtained from a sol-gel process constituted by the alkoxide precursor tetraethoxysilane (TEOS) and 3-trimethoxysilylpropyl methacrylate (TMSM), with the addition of cerium nitrate (0.01 M) and polyethyleneglycol plasticizer (20 g.L -1 ) to the sol formulation. The films were obtained by dip-coating, applying one and two layers and curing them at different temperatures (60°C and 90°C) for 20 minutes, and adhering UV curing paint to each film respectively. The results showed that the double layered hybrid film obtained at 60°C had a higher layer of thickness and the best performance in the electrochemical assays, in other words, higher resistance to corrosion. Furthermore, in studies following the application of UV coating, the hybrid-film monolayer cured at 60°C wich had an organic coating of cured UV applied to it, achieved a performance similar to that of the pretreated alkyd greenhouse currently used in the metal packaging industry.

No abstract

No abstract