Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of HA/TiN Coating on the Electrochemical Characteristics of Ti-Ta-Zr Alloys

Ti-Ta-Zr합금의 전기화학적 특성에 미치는 HA/TiN 코팅의 영향

  • Oh, Mi-Young (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry) ;
  • Kim, Won-Gi (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry) ;
  • Choe, Han-Cheol (Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry)
  • 오미영 (조선대학교 치과대학 생체재료학교실 및 생체재료 나노계면 활성화센터) ;
  • 김원기 (조선대학교 치과대학 생체재료학교실 및 생체재료 나노계면 활성화센터) ;
  • 최한철 (조선대학교 치과대학 생체재료학교실 및 생체재료 나노계면 활성화센터)
  • Received : 2008.08.08
  • Published : 2008.10.25
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Abstract

Electrochemical characteristics of Ti-30Ta-xZr alloys coated with HA/TiN by using magnetron sputtering method were studied. The Ti-30Ta containing Zr(3, 7, 10 and 15wt%) were 10 times melted to improve chemical homogeneity by using a vacuum furnace and then homogenized for 24hrs at $1000^{\circ}C$. The specimens were cut and polished for corrosion test and coating, and then coated with HA/TiN, respectively, by using DC and RF-magnetron sputtering method. The analyses of coated surface and coated layer were carried out by using optical microscope(OM), field emission scanning electron microscope(FE-SEM) and X-ray diffractometer(XRD). The electrochemical characteristics were examined using potentiodynamic (-1,500 mV~ + 2,000 mV) and A.C. impedance spectroscopy(100 kHz ~ 10 mHz) in 0.9% NaCl solution at $36.5{\pm}1^{\circ}C$. The microstructure of homogenized Ti-30Ta-xZr alloys showed needle-like structure. In case of homogenized Ti-30Ta-xZr alloys, a-peak was increased with increasing Zr content. The thickness of TiN and HA coated layer showed 400 nm and 100 nm, respectively. The corrosion resistance of HA/TiN-coated Ti-30Ta-xZr alloys were higher than that of the non-coated Ti-30TaxZr alloys, whic hindicate better protective effect. The polarization resistance($R_p$) value of HA/TiN coated Ti-30Ta-xZr alloys showed $8.40{\times}10^5{\Omega}cm^2$ which was higher than that of non-coated Ti-30Ta-xZr alloys.

Keywords

Acknowledgement

Supported by : 조선대학교

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