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Resumen Se evaluo el efecto del pH de fluido corporal simulado en la formacion de apatitas y en la degradacion de superficies de la aleacion Ti6Al4V recubiertas con Fosfato de Calcio mediante la tecnica de lectrodeposicion catodica. Como variables de estudio se tomaron el pH del fluido corporal simulado y el tiempo de inmersion de los recubrimientos. Mediante microscopia electronica de barrido, espectroscopia de energia dispersiva, difraccion de rayos X y absorcion atomica se pudo corroborar la formacion de apatitas, y la degradacion de los recubrimientos se evaluo mediante Espectroscopia de impedancia electroquimica y curvas de polarizacion potenciodinamicas. Los resultados obtenidos muestran que los recubrimientos tenian altas concentraciones de Fluorapatita (Ca5(PO4)3F) y que su formacion se ve favorecida a medida que el pH del fluido corporal simulado y el tiempo de inmersion aumenta. Por otra parte, se obtuvo que las muestras evaluadas a pH de 7,2 son menos estables termodinamicamente, sin embargo, las evaluadas a 7,6 presentan una superficie mas activa, por lo que se obtiene una mayor velocidad de degradacion. Abstract The pH eect of a Simulated Body Fluid in the apatite formation and the degradation of the Ti6Al4V alloy surfaces, coated by calcium phosphate obtained through cathodic electrodeposition was evaluated. The simulated body fluid pH and the coating immersion time were taken as variables. The formation of apatite was corroborated by Scanning Electron Microscopy, Energy Dispersive Spectroscopy, X Ray Diraction and Atomic Absorption Techniques. The coating degradation was assessed by the Electrochemical Impedance Spectroscopy and the Potential Dynamic Polarization Curves. The results have shown that the coatings had high concentrations of fluorapatite (Ca5(PO4)3F) and its formation was favored as the simulated body fluid pH and the immersion time increases. Moreover, it was found that the coatings samples evaluated at pH 7.2 were less thermodynamically steady, however, the evaluated coating at pH 7.6 exhibited a more active surface, so that a higher rate of degradation is obtained.

ciencia en desarrollo

Evaluación de la degradación de superficies de fluorapatita mediante técnicas electroquímicas. (Degradation Assessment of Fluorapatite Surfaces using Electrochemical Techniques)