resumo
Siloxane-poly(methyl methacrylate) (PMMA) hybrid was synthesized based on the sol-gel method and applied to Ti-6Al-4V through dip-coating. The structural feature of the hybrid was subjected to Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TG); its morphological properties were analyzed through scanning electron microscope (SEM), energy dispersive spectrometry (EDS), atomic force microscopy (AFM) and contact angle. The electrochemical behavior and corrosion resistance of both the hybrid coating and the uncoated substrate were investigated based on electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Results showed homogeneous coating formation due to the rigid hybrid network formed during polymerization, hydrolysis and condensation reactions. This outcome suggested interaction between the organic (methyl methacrylate (MMA)) and inorganic (tetraethyl orthosilicate (TEOS)) phases, which was favored by the coupling agent (3-(trimethoxysilyl)propyl methacrylate (TMSM)). The S0M (PMMA-SiO2 hybrid Ti-6Al-4V coated alloy) film presented regular topography and adherence to the substrate. Electrochemical simulated body fluid (SBF) tests showed that the hybrid coating presented better barrier properties (168 h of the immersion time) than the uncoated substrate, fact that makes it an interesting material for anti-corrosive applications in biomaterials.
palavras-chave
CORROSION PROTECTION; ELECTROCHEMICAL-BEHAVIOR; TITANIUM; SURFACE; TI; SVET; ROUGHNESS; IMPLANTS; STEEL; FILMS
categoria
Chemistry
autores
Santana, JA; Kunst, SR; Oliveira, CT; Bastos, AA; Ferreira, MGS; Sarmento, VHV
nossos autores
António Alexandre Cunha Bastos
Investigador Auxiliar
Mário Guerreiro Silva Ferreira
Professor(a) Jubilado(a)agradecimentos
The authors would like to thank CAPES (the Brazilian National Council for the Improvement of Higher Education). The current study was partly financed by Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior, Brasil (CAPES), Finance Code 001.