INFLUÊNCIA DE TRÊS PRÉ-TRATAMENTO DE SUPERFÍCIE COM POSTERIOR APLICAÇÃO DE TINTA POLIÉSTER NA RESISTÊNCIA A CORROSÃO DO AÇO AISI 1008
INFLUENCE OF THREE SURFACE PRE-TREATMENTS WITH SUBSEQUENT APPLICATION OF POLYESTER INK IN CORROSION RESISTANCE OF AISI 1008 STEEL
Marcolin, Patrícia; Pederiva, Leticia; Salvador, Débora Guerra; Beltrami, Lilian Vanessa Rossa; Oliveira, Claúdia Trindade; Kunst, Sandra Raquel
Resumo
O 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
Abstract
The 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.
Keywords
Referências
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