Análisis de la bioactividad de Mg AZ31 recubierta por PEO (Plasma Electrolytic Oxidation)

Kevin Dorado-Bustamante; Benjamín Zuluaga-Díaz; Hugo Estupiñán-Duran

Publicado

2018-04-01

Análisis de la bioactividad de Mg AZ31 recubierta por PEO (Plasma Electrolytic Oxidation)

Bioactivity analysis of the AZ31 Mg alloy coated by PEO (Plasma Electrolytic oxidation)

Palabras clave:

anodizado, recubrimiento, corrosión, biocompatibilidad, biomaterial (es)
anodized, coating, corrosion, biocompatibility, biomaterial (en)

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Autores/as

Kevin Dorado-Bustamante Instituto Balseiro https://orcid.org/0000-0002-2810-1191
Benjamín Zuluaga-Díaz Universidad Nacional de Colombia https://orcid.org/0000-0003-2412-3761
Hugo Estupiñán-Duran Universidad Nacional de Colombia https://orcid.org/0000-0002-9607-3364

Resumen (es)
Resumen (en)

El Magnesio es un material que presenta propiedades favorables para su selección como biomaterial; sin embargo, su aplicación se ve restringida por la rápida corrosión. En esta investigación se evaluó la modificación superficial de magnesio AZ31 mediante PEO y su efecto sobre las propiedades protectoras y bioactivas. La microestructura, composición de la fase y la distribución de los elementos en el recubrimiento fue caracterizada mediante MEB, DRX y EDX. La estabilidad química, la resistencia a la corrosión, la bioactividad y las propiedades electrónicas se evaluaron usando EIE y Mott-Schottky en solución de fluido corporal simulado. El análisis de DRX y EDX índico la presencia de MgO, MgSiO₄ en los recubrimientos. Un análisis de la sección transversal presento un recubrimiento compacto cerca al sustrato seguido por un estrato poroso en la superficie. Del análisis de EIE se mostró que el tratamiento incrementa la protección del sustrato en un medio fisiológico simulado.

Magnesium is a material that presents favorable properties for its selection as biomaterial; however, its application is restricted by the rapid corrosion. In this research was evaluated the surface modification of magnesium AZ31 by PEO and its effect on the protective and bioactive properties. The microstructure, phase composition and distribution of elements in the coating were characterized by SEM, XRD and EDX. Chemical stability, corrosion resistance, the bioactivity and electronic properties were evaluated using EIS and Mott-Schottky in simulated body fluid. The analysis of XRD and EDX indicated the presence of MgO, MgSiO₄ in the coatings. The cross section analysis present a compact layer close to the substrate followed by an outer porous layer. EIS analysis showed that treatment increased the substrate protection in a simulated physiological medium.

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