Effects of Mo and Pd on Corrosion Resistance of V-Free Titanium Alloys for Medical Implants

摘要: The corrosion resistances of Ti-15%Zr-4%Nb-4%Ta-0.2%Pd-0.2%O-0.05%N and Ti-15%Sn-4%Nb-2%Ta-0.2%Pd-0.2%O alloys were compared with pure Ti grade 2, Ti-6%Al-4%V ELI (Extra low interstitial), Ti-6%Al-2%Nb-1%Ta type Ti-15% Mo-5%Zr-3%Al for medical implants by anodic polarization immersion tests at 310 K in various pseudo saline solutions. change current density was small up to passivity zones 1 mass% lactic acid, PBS (Phosphate-buffered solution) (-), calf serum Eagle's MEM (Minimum essential medium) + bovine solutions except 5% HCI. Ti-15%Zr-4% Nb-4%Ta-0.2%Pd-0.2%O-0.05%N alloy lowest among the whole alloys. densities a region higher than 2 V tend increase following relation; > Pure 2>Ti-6%Al-2%Nb-1%Ta> Ti-15%Sn-4%Nb-2%Ta-0O.2%Pd-0.2%0 α+β Otherwise passive β Ti-15%Mo-5%Zr-3%Al that α Passive films formed on consisted mainly 4+ , Zr Al 6+ Mo as demonstrated X-ray photoelectron spectroscopy (XPS). rate ions released from deaerated HCl solution decreased increasing Zr, Nb, Ta, Pd contents. Especially, Ti-15%Zr-4%Nb-(2∼4%)Ta-Pd containing range 0 0.2% remarkably 0.2 0.5%Pd. Ti-Zr-Nb-Ta-Pd Ti-Sn-Nb-Ta-Pd test Sn Sn, Nb 5 +, Ta 5+ Pd. increased Ti-15%Sn-4%Nb-2%Ta-0.2%Pd-0.2%nO≥Ti-6°/nAl-2%Nb-1%Ta≥Ti-6%Al-4%V ELI≥Pure 2>Ti-15%Zr-4%Nb-4%Ta-0.2%Pd-0.2%O-0.05%N ≥ alloy.