| 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 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. |
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| Key Words |
| Ti-Ta-Zr alloy, HA/TiN coating, electrochemical characteristics |
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