J Korean Dent Sci.  2017 Jun;10(1):10-21. 10.5856/JKDS.2017.10.1.10.

Electrochemical Characteristics of Nanotubular Ti-25Nb-xZr Ternary Alloys for Dental Implant Materials

Affiliations
  • 1Department of Dental Materials, Research Center of Nano-Interface Activation for Biomaterials & Research Center for Oral Disease Regulation of the Aged, College of Dentistry, Chosun University, Gwangju, Korea. hcchoe@chosun.ac.kr

Abstract

PURPOSE
The purpose of this study was to investigate the electrochemical characteristics of nanotubular Ti-25Nb-xZr ternary alloys for dental implant materials.
MATERIALS AND METHODS
Ti-25Nb-xZr alloys with different Zr contents (0, 3, 7, and 15 wt.%) were manufactured using commercially pure titanium (CP-Ti), niobium (Nb), and zirconium (Zr) (99.95 wt.% purity). The alloys were prepared by arc melting in argon (Ar) atmosphere. The Ti-25Nb-xZr alloys were homogenized in Ar atmosphere at 1,000℃ for 12 hours followed by quenching into ice water. The microstructure of the Ti-25Nb-xZr alloys was examined by a field emission scanning electron microscope. The phases in the alloys were identified by an X-ray diffractometer. The chemical composition of the nanotube-formed surfaces was determined by energy-dispersive X-ray spectroscopy. Selforganized TiOâ‚‚ was prepared by electrochemical oxidation of the samples in a 1.0 M H₃POâ‚„+0.8 wt.% NaF electrolyte. The anodization potential was 30 V and time was 1 hour by DC supplier. Surface wettability was evaluated for both the metallographically polished and nanotube-formed surfaces using a contact-angle goniometer. The corrosion properties of the specimens were investigated using a 0.9 wt.% aqueous solution of NaCl at 36℃±5℃ using a potentiodynamic polarization test. RESULT: Needle-like structure of Ti-25Nb-xZr alloys was transform to equiaxed structure as Zr content increased. Nanotube formed on Ti-25Nb-xZr alloys show two sizes of nanotube structure. The diameters of the large tubes decreased and small tubes increased as Zr content increased. The lower contact angles for nanotube formed Ti-25NbxZr alloys surfaces showed compare to non-nanotube formed surface. The corrosion resistance of alloy increased as Zr content increased, and nanotube formed surface showed longer the passive regions compared to non-treatment surface.
CONCLUSION
It is confirmed that corrosion resistance of alloy increased as Zr content increased, and nanotube formed surface has longer passive region compared to without treatment surface.

Keyword

β-type titanium; Electrochemical methods; Nanotubes; Needle-like; Surface morphology; Ti-25Nb-xZr

MeSH Terms

Alloys*
Argon
Atmosphere
Corrosion
Dental Implants*
Freezing
Ice
Nanotubes
Niobium
Spectrum Analysis
Titanium
Water
Wettability
Zirconium
Alloys
Argon
Dental Implants
Ice
Niobium
Titanium
Water
Zirconium
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