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

• Published in: 대한금속·재료학회지, 46(10) Vol. 46; no. 10; pp. 691 - 699
• Main Authors: 오미영, Mi Young Oh, 김원기, Won Gi Kim, 최한철, Han Cheol Choe
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 22.10.2008; 대한금속·재료학회
• Subjects: electrochemical characteristics; HA/TiN coating; Ti-Ta-Zr alloy; 재료공학
• ISSN: 1738-8228; 2288-8241

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 1,000℃. 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(-1,500mV~+2,000 mV) and A.C. impedance spectroscopy(100 kHz~10 mHz) in 0.9% NaCl solution at 36.5±1℃. 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(Rp) value of HA/TiN coated Ti-30Ta-xZr alloys showed 8.40×10(5) Ωcm2 which was higher than that of non-coated Ti-30Ta-xZr alloys.