Deposition, Characterization, and Corrosion Resistance of Nanocrystalline Bioactive Hydroxyapatite Ceramic Coating on New Ti‐20Nb‐10Zr‐5Ta Alloy

Abstract

A new Ti-20Nb-10Zr-5Ta bioalloy with low Young's modulus (59 GPa) was coated with nanocrystalline hydroxyapatite (HA) ceramic layer by chemical method of soaking in a slightly supersaturated calcium and phosphate ions solution.The formation of HA was demonstrated using XRD, Raman microscopy and energy-dispersive X-ray spectroscopy; the coating morphology and microstructure were determined using SEM. The coating protective capacity and its long-term (2000 h) stability in simulated biofluids were revealed by the improvement of the all electrochemical parameters; also, HA ceramic coating reduced the alloy corrosion and ion release rates. After 2000 immersion hours in biofluids no compositional change occurs in the HA ceramic coating, only depositions from solution take place that change the coating morphology. Also, the in time increase of the coating stability and thickness (as a result of the new deposition from physiological solutions) indicates bioactivity.

Investigation on corrosion protection and mechanical performance of minerals substituted hydroxyapatite coating on HELCDEB-treated titanium using pulsed electrodeposition method

“…During HELCDEB irradiation, the surface undergoes superfast heating, melting and solidication to provide improved physicochemical properties and bonding strength to the material, which cannot be achieved with other surface treatments. 33 Many methods have been developed to obtain bioactive pure and substituted HAP coatings, such as biomimetic processes, 34,35 pulsed laser deposition, 36 electrochemical deposition, [37][38][39][40] micro arc oxidation, 41 and plasma spraying. 42 Electrodeposition can be used to deposit HAP on any complex geometry substrates.…”

Surface characterisation and electrochemical stability of anodised new alloy in simulated physiological electrolytes

“…10): a continuous coating dotted with rounded sub-micron features. This microstructure has been observed as typical of hydroxyapatite coatings on biomedical alloys [52,53].…”

Obtaining, structural and corrosion characterization of anodized nanolayers on Ti-20Zr alloy surface

“…The first anodization experiments at lower current density of 5 mA/cm 2 Raman micro-spectroscopy is especially suitable for the analysis of oxides [47,48] and/or phosphates [49][50][51], even if they are presented as nanocrystalline or secondary phases in surface layers, difficult to detect by other methods. Raman spectra (Fig.…”