Electrochemical behavior of different preparations of plasma‐sprayed hydroxyapatite coatings on Ti6Al4V substrate

Abstract

The corrosion behavior of four different preparations of plasma-sprayed hydroxyapatite (HA) coatings on Ti6Al4V substrates in static Hank's balanced salt solution was investigated using dc potentiodynamic and ac impedance techniques. Two different nominal thicknesses, 50 microm and 200 microm, and two different spraying conditions, were considered. The electrochemical impedance experiments proved this technique to be very suitable for the investigation of the electrochemical behavior of surgical implant alloys when they are coated with HA, which is characterized by the dissolution and passivation characteristics of the underlying metal substrate. Because the coatings are porous, ionic paths between the electrolytic medium and the base material can eventually be produced, resulting in the corrosion of the coated metal. Differences in the corrosion resistance of the coated materials were detected, and a relevant model for the description of the coating degradation in the biosimulating solution was proposed. The model consisted of the description of the coated system in terms of a two-layer model of the surface film. Significant differences in electrochemical behavior for similar nominal thicknesses of HA coatings obtained under different spraying conditions were found.

Dental Implant Systems

“…[157] investigated the corrosion behavior of four different preparations of plasma-sprayed hydroxyapatite (HA) coatings (50 μm and 200 μm) on Ti-6Al-4V substrates in static Hank’s balanced salt solution through DC potentiodynamic and AC impedance EIS techniques. Because the coatings are porous, ionic paths between the electrolytic medium and the base material can eventually be produced, resulting in the corrosion of the coated metal.…”

“…Because the coatings are porous, ionic paths between the electrolytic medium and the base material can eventually be produced, resulting in the corrosion of the coated metal. It was concluded that significant differences were found in electrochemical behavior for similar nominal thicknesses of HA coatings obtained under different spraying [157]. Filiaggi et al .…”

Osteoconductive Metallic Implants Using Hydroxyapatite Nanoparticles

“…However, bone does not bond directly to these materials, therefore, in order to enhance the bone-bonding ability, titanium and its alloys are often coated with HA by various methods. Hence the combination of nano-TiO 2 and nano-HA coating on 316L SS may be used as an alternative in orthopedic appliances, providing a competitive and low cost alternative related to highly expensive conventional Co-Cr and Ti alloys [3,41,53].…”

Revisión del comportamiento biocompatible de biovidrio como material promisorio en la industria biomédica

“…El termino biomaterial fue tomado inicialmente para describir un material que podría ser utilizado para reemplazar huesos y tejidos enfermos o dañados en un organismo vivo, ( Williams, 1987); sin embargo el trabajo interdisciplinario ha hecho que la definición sea más amplia; en ese sentido, los biomateriales pueden ser considerados como productos aptos para ser utilizados en los seres humanos con fines de tratamiento o alivio de una enfermedad, lesión o bien para sustitución o modificación de su anatomía o de un proceso fisiológico (Enderle, 2005;Souto et al, 2003); es por esto que se han desarrollado diferentes materiales que puedan suplir los requerimientos físicos, químicos y biológicos para un perfecto funcionamiento que garanticen las mejores condiciones de trabajo y los mejores resultados (Geringer et al, 2013;García et al, 2004). En el campo de los biomateriales puede hacerse una clasificación primaria por la naturaleza del material: Biometales, Biopolímeros, cerámicos; a pesar de sus diferencias, su principal propiedad es la de no generar residuos tóxicos en la interacción con el organismo.…”