Anodização porosa de titânio em eletrólito livre de HF
Porous anodizing titanium in HF free electrolyte
Lucas Theisen, Sandra Raquel Kunst, Ana Carolina Viero Bianchin, Fernando Dal Pont Morisso, Cláudia Trindade Oliveira
Resumo
Os fatores críticos que determinam a aplicação do titânio e suas ligas para implantes biomédicos são suas propriedades mecânicas e químicas, seguidas pela excelente resistência à corrosão e biocompatibilidade. Com isso, a anodização tem sido usada para favorecer a formação de superfícies porosas que melhoram o processo de osseointegração do titânio, buscando propriedades que possam estimular o crescimento do osso neoformado. No entanto, esse processo utiliza eletrólitos à base de ácido fluorídrico (HF), o qual é nocivo para a saúde do operador. O objetivo deste estudo é obter superfície porosa de titânio em eletrólitos livres de F- . Desta forma, amostras de titânio foram anodizadas em eletrólitos de ácido sulfúrico com e sem adição peróxido de hidrogênio, em diferentes concentrações (1/2, 1 e 2 M H2 O2 ) a fim de obter superfície porosa de óxido de titânio. O crescimento dos óxidos foi avaliado por meio de transientes de anodização e as amostras obtidas foram analisadas ao MEV. As amostras apresentaram a formação de óxidos contendo poros, de dimensões nanométricas. Portanto, este estudo mostra uma alternativa a formação de porosidade, sem uso de eletrólito a base de HF, com potencial aplicação em biomateriais.
Palavras-chave
Abstract
The critical factors that determine the application of titanium and its alloys for biomedical implants are its mechanical and chemical properties, followed by excellent corrosion resistance and biocompatibility. Thus, anodization has been used to favor the formation of porous surfaces that improve the osseointegration process in titanium, seeking properties that can stimulate the growth of newly formed bone. However, this process uses electrolytes based on hydrofluoric acid (HF), which is harmful to the health of the patient receiving the prosthesis. The aim of this study was to obtain a porous surface of titanium in F-free electrolytes. In this way, titanium samples were anodized in sulfuric acid electrolytes with and without hydrogen peroxide addition, in varying concentrations, in order to obtain a porous surface of titanium oxide. The growth of oxides was evaluated by means of anodizing transients and the samples obtained were analyzed by SEM. The samples showed the formation of porous oxides of nanometric dimensions. Therefore, this study shows an alternative for the formation of pores, without the use of HF-based electrolyte, with potential application in biomaterials.
Keywords
Referências
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Submetido em:
21/06/2022
Aceito em:
31/08/2022
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