XPS and EIS studies to account for the passive behavior of the alloy Ti-6Al-4V in Hank’s solution

The passivation mechanism of the film formed on the alloy Ti-6Al-4V was evaluated in Hank’s solution to infer the properties of this alloy as an implant material. Alloy passivation was found from electrochemical measurements and X-ray photoelectron spectroscopy (XPS) to strongly depend on the oxidat...

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Veröffentlicht in:Journal of solid state electrochemistry 2019-11, Vol.23 (11), p.3187-3196
Hauptverfasser: Chávez-Díaz, Mercedes P., Luna-Sánchez, Rosa M., Vazquez-Arenas, Jorge, Lartundo-Rojas, Luis, Hallen, José M., Cabrera-Sierra, Román
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container_end_page 3196
container_issue 11
container_start_page 3187
container_title Journal of solid state electrochemistry
container_volume 23
creator Chávez-Díaz, Mercedes P.
Luna-Sánchez, Rosa M.
Vazquez-Arenas, Jorge
Lartundo-Rojas, Luis
Hallen, José M.
Cabrera-Sierra, Román
description The passivation mechanism of the film formed on the alloy Ti-6Al-4V was evaluated in Hank’s solution to infer the properties of this alloy as an implant material. Alloy passivation was found from electrochemical measurements and X-ray photoelectron spectroscopy (XPS) to strongly depend on the oxidation of Ti and Al, microstructural changes associated with the Al and V, and the formation of metallic hydroxides and oxyhydroxides that disrupt the TiO 2 matrix. Experimental impedance diagrams were fitted using the point defect model (PDM, transfer function) to describe the passive character of the alloy. According to this analysis, the transport of oxygen and hydroxide defects across the film on the alloy surface determines the adsorption of oxygen from water dissociation and/or phosphate and the precipitation of calcium phosphate. Therefore, osseointegration of the alloy Ti-6Al-4V occurs across the entire surface and strongly depends on the defects present in the film, Al incorporation, the penetration of hydroxide ions (hydration), and oxygen adsorption.
doi_str_mv 10.1007/s10008-019-04368-5
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Alloy passivation was found from electrochemical measurements and X-ray photoelectron spectroscopy (XPS) to strongly depend on the oxidation of Ti and Al, microstructural changes associated with the Al and V, and the formation of metallic hydroxides and oxyhydroxides that disrupt the TiO 2 matrix. Experimental impedance diagrams were fitted using the point defect model (PDM, transfer function) to describe the passive character of the alloy. According to this analysis, the transport of oxygen and hydroxide defects across the film on the alloy surface determines the adsorption of oxygen from water dissociation and/or phosphate and the precipitation of calcium phosphate. 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subjects Adsorption
Aluminum
Analytical Chemistry
Calcium phosphates
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Defects
Electrochemistry
Energy Storage
Hydroxides
Original Paper
Oxidation
Oxygen
Passivity
Photoelectrons
Physical Chemistry
Point defects
Surface chemistry
Titanium base alloys
Titanium dioxide
Transfer functions
X ray photoelectron spectroscopy
title XPS and EIS studies to account for the passive behavior of the alloy Ti-6Al-4V in Hank’s solution
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