Abstract
Mg–1Ca samples were implanted with biocompatible alloy ions Ag, Fe and Y respectively with a dose of 2×1017ionscm−2 by metal vapor vacuum arc technique (MEVVA). The surface morphologies and surface chemistry were investigated by SEM, AES and XPS. Surface changes were observed after all three kinds of elemental ion implantation. The results revealed that the modified layer was composed of two sublayers, including an outer oxidized layer with mixture of oxides and an inner implanted layer, after Ag and Fe ion implantation. Y ion implantation induced an Mg/Ca-deficient outer oxidized layer and the distribution of Y along with depth was more homogeneous. Both electrochemical test and immersion test revealed accelerated corrosion rate of Ag-implanted Mg–1Ca and Fe-implanted Mg–1Ca, whereas Y ion implantation showed a short period of protection since enhanced corrosion resistance was obtained by electrochemical test, but accelerated corrosion rate was found by long period immersion test. Indirect cytotoxicity assay indicated good cytocompatibility of Y-implanted Mg–1Ca. Moreover, the corresponding corrosion mechanisms involving implanting ions into magnesium alloys were proposed, which might provide guidance for further application of plasma ion implantation to biodegradable Mg alloys.
Highlights
Caracterización de recubrimientos DLC/Si bajo la influencia de un fluido biológico simulado interventions that the patients must undergo
The results indicate that the coating experiences an increase in the wear volume, when is subjected to the micro-abrasion-corrosion mechanism, in comparison with the micro-abrasion test
The most significant loss is found in the substrate without coating, which demonstrates the protective effect of the coating
Summary
El incremento de la vida útil de los implantes biomédicos es hoy un área de desarrollo, ya que los materiales utilizados convencionalmente presentan inconvenientes en su desempeño a largo plazo. Los recubrimientos sobre implantes han revelado que el deslizamiento y la abrasión son los mecanismos de desgaste predominantes [15]; pero encontrar un recubrimiento óptimo para reducir la fricción es enormemente dispendioso, debido a la enorme cantidad de recubrimientos disponibles; por esta razón se espera que métodos sencillos como el. Adicionalmente, el método de microabrasión permite evaluar las muestras en un medio electrolítico para estudiar los fenómenos corrosivos; por tal razón, se presenta como técnica para determinar los mecanismos de desgaste que se presentan en el acero inoxidable 316LVM cuando tiene un recubrimiento de DLC. Una de las alternativas para mejorar el comportamiento de reemplazos articulares son los recubrimientos duros, pues en aplicaciones técnicas, como en herramientas de corte y mecanizado, elevan las propiedades del sustrato, mejorando su resistencia al desgaste y a la corrosión. En el presente trabajo se realizaron pruebas de microabrasión sobre muestras de recubrimientos DLC/Si depositados sobre sustratos de acero AISI 316 LVM contra una esfera de hueso (cóndilo de bovino) en contacto con lactato de Ringer con micropartículas de alúmina en suspensión, para simular condiciones biológicas de desgaste
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