Abstract
The impact of sandblasting, anodic oxidation, and anodic oxidation after sandblasting on the surface structure and properties of titanium alloys was investigated. It was found that the surface treatments had a significant influence on the surface roughness values, contact angle values, Vickers hardness, wear resistance, and corrosion resistance of titanium alloys. The surface roughness of titanium alloys with sandblasting treatment was increased by 67% compared to untreated specimen. The Vickers hardness of titanium alloys treated with anodic oxidation after sandblasting was found to increase from 380.8 HV to 408.5 HV, which was increased by 7.3%. The surface treatments in this work improved the wear resistance of the titanium alloys to some extent, and it can be found that the wear scar width is reduced by up to 18.6%. The corrosion resistance of the titanium alloys was found to improve on anodic oxidation. Sandblasting was found to increase surface roughness and promote the formation of a porous layer during the anodization process, resulting in a slight decrease in corrosion resistance. The corrosion current density was increased by 21% compared to the untreated specimen. The corrosion current density of the titanium alloy treated with anodic oxidation decreased to 7.01 × 10−8 A/cm2. The corrosion current density was decreased by 24% compared to the untreated specimen. The corrosion current density of the titanium alloys treated with anodic oxidation after sandblasting decreased to 7.63 × 10−8 A/cm2. The corrosion current density was decreased by 8.8% compared to the specimen with anodic oxidation. The anodic oxidation provided a hydrophilic property for the surface of Ti alloys, which could show a better osseointegration characteristic than that of sandblasting. The impact of the surface treatments on surface structure and properties of titanium alloys was studied.
Highlights
IntroductionTitanium (Ti) and Ti alloys are applied in many key areas, such as ocean and aerospace engineering and the medical industry, due to their excellent combination of mechanical properties, strong corrosion resistance, and low density [1,2,3,4]
It could be found that the Vickers hardness of specimen D was increased to 408.5 HV, which was increased by 7.3% compared to specimen A
The Vickers hardness of Ti alloys treated by anodic oxidation after sandblasting was increased from 380.8 HV to 408.5 HV, which was increased by 7.3%
Summary
Titanium (Ti) and Ti alloys are applied in many key areas, such as ocean and aerospace engineering and the medical industry, due to their excellent combination of mechanical properties, strong corrosion resistance, and low density [1,2,3,4]. The formation of oxide films of Ti alloys can hinder the contact of the medium and the substrates of Ti alloys, which improve the corrosion resistance of Ti alloys [8,9]. Ti alloys oxide films naturally generated are relatively thin, and do not make a significant contribution towards corrosion resistance of Ti alloys. The occurrence of wear can reduce the mechanical properties of the metal material, and cause the failure of the implant [10,11,12,13], eventually leading to increased patient suffering. Improving the surface properties of medical implants using Ti alloys is urgent
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