Optimization of Anodization Parameters in Ti-30Ta Alloy

Abstract

The current metallic biomaterial still presents failures associated with the bulk alloy and the interface of material/human body. In previous studies, titanium alloy with tantalum showed the elastic modulus decrease in comparison with that of commercially pure (cp) titanium. In this study, surface modification on Ti-30Ta alloy was investigated. Titanium and tantalum were melted, homogenized, cold-worked by a rotary swaging process and solubilized. The anodization process was performed in electrolyte contained glycerol + NH4F 0.25% at 30 V using seven different durations—4 h, 5 h, 6 h, 7 h, 8 h, 9 h, and 10 h and annealed at 530 °C for 1 h. The surface topography was characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) measurements, X-ray diffraction analysis (XRD), and contact angle. From the results, we conclude the time of anodization process influences the shape and morphology of the anodized layer. The 5 h-anodization process produced a smooth and porous surface. The 4-, 6-, 7-, 8-, 9-, and 10-h conditions showed nanotubes morphology. All surfaces are hydrophilic (<90°). Likewise, all the investigated conditions present anatase phase. So, this surface modification presents potential for biomedical application. However, more work needs to be done to better understand the influence of time on the anodization process.

EIS Characterization of Ti Alloys in Relation to Alloying Additions of Ta

“…In this context, binary alloys of titanium and tantalum have been developed and analyzed [14][15][16][17][18][19][20][21][22][23] and are predicted to be potential products for medical purposes; as tantalum is a non-toxic element [24], they have better compatibility with bone tissue compared with cp-Ti and Ti-6Al-4V alloys [21], and Ti-Ta alloys exhibit reduced modulus of elasticity and increased relative strength (at equivalent stiffness) compared with commercially pure titanium (cp-Ti) [25]. More than this, today novel biocompatible alloys such as high entropy alloys with Ti and Ta are considered for biomedical applications and, therefore, it is necessary to clarify the influence of tantalum in the behavior of the alloy.…”

Medical Implant Surface Technology: Geometrical Formation of Titania Nanotube Arrays by Divergence Anodization Parameters

“…Although the surface roughness can be manufactured in various methods, the inert metal properties of Ti become a drawback in biomedical applications, thereby encouraging the modi cation of Ti to titania nanotube arrays (TNA). Several anodization variables such as voltage, anodization period, pH and temperature of electrolyte bath have been discussed previously [3] in relation to the fabrication of TNA. In our most recent research, two different anodization times with varied TNA compositions provided impressive results for the drug encapsulation e ciency, with 60 mins of anodization expressing more than 98% encapsulation e ciency compared to 30 mins anodization (around 47%) [4].…”