Electrochemical Properties of Ti-30Ta-(3~15)Nb Alloys Coated by HA/Ti Compound Layer
HA/Ti 복합층 코팅한 Ti-30Ta-(3~15)Nb 합금의 전기화학적 특성
정용훈;최한철;고영무;
Jeong, Yong-Hoon;Choe, Han-Cheol;Ko, Yeong-Mu;
조선대학교 치과대학 생채재료학교실, 2단계 BK 21;
Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials College of Dentistry, 2nd Stage of Brain Korea 21 for College of Dentistry;Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, College of Dentistry, 2nd Stage of Brain Korea 21 for College of Dentistry;
DOI : 10.5695/JKISE.2008.41.2.057
Electrochemical properties of Ti-30Ta-$(3{sim}15)$Nb alloys coated by HA/Ti compound layer have been studied by various electrochemical method. Ti-30Ta binary alloys contained 3, 7, 10, and 15 wt% Nb contents were manufactured by the vacuum furnace system. The specimens were homogenized for 24 hrs at $1000^{circ}C$. The samples were cut and polished for corrosion test and coating. It was coated with HA/Ti compound layer by magnetron sputter. The HA/Ti non-coated and coated morphology of Ti alloy were analyzed by x-ray diffractometer(XRD) and filed emission scanning electron microscope(FE-SEM). The corrosion behaviors were investigated using potentiodynamic method in 0.9% NaCl solution at $36.5{pm}1^{circ}C$. The homoginazed Ti-30Ta-$(3{sim}15wt%$)Nb alloys showed the ${alpha}+{eta}$ phase, and ${beta}$ phase peak was predominantly appeared with increasing Nb content. The microstructure of Ti alloy was transformed from needle-like structure to equiaxed structure as Nb content increased. HA/Ti composite surface showed uniform coating layer with 750 nm thickness. The corrosion resistance of HA/Ti composite coated Ti-alloys were higher than those of the non-coated samples in 0.9% NaCl solution at $36.5{pm}1^{circ}C$. Especially, corrosion resistance of Ti-Ta-Nb system increased as Nb content increased.
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