HA/Ti 복합층 코팅한 Ti-30Ta-(3~15)Nb 합금의 전기화학적 특성
Electrochemical Properties of Ti-30Ta-(3~15)Nb Alloys Coated by HA/Ti Compound Layer
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Electrochemical properties of Ti-30Ta-(3~15)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 1000oC. 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℃. The homoginazed Ti-30Ta-(3~15wt%)Nb alloys showed the a+b phase, and b 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 750nm 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 1℃. Especially, corrosion resistance of Ti-Ta-Nb system increased as Nb content increased.
Abstract
Electrochemical properties of Ti-30Ta-(3~15)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 1000oC. 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℃. The homoginazed Ti-30Ta-(3~15wt%)Nb alloys showed the a+b phase, and b 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 750nm 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 1℃. Especially, corrosion resistance of Ti-Ta-Nb system increased as Nb content increased.
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