Abstract
Owing to their superior biocompatibility, titanium and its alloys are often the first choice for implant materials in biomedical applications, especially for dental and bone repairs (orthodontics and prosthodontics). Titanium has low density and shows good mechanical and chemical properties. Although Ti-6Al-4V alloy exhibits excellent corrosion resistance properties, the metal ions released during corrosion are likely to induce aseptic loosening in long-term implantations. In the present study, Ti-6Al-4V alloy was subjected to two specific heat treatments, namely, air cooling and water quenching. The potentiodynamic polarization and electrochemical impedance spectroscopy measurements revealed remarkable improvement in the corrosion resistance properties of the heat-treated specimens. The presence of the β phase is a plausible reason for the improvement. Scanning electron microscopy, X-ray diffraction phase composition analysis, and microstructural characterization were performed to confirm the presence of the β phase.
Highlights
Titanium alloys are used in orthopedic applications owing to their good biocompatibility, appropriate mechanical properties, and excellent corrosion resistance [1]
In some previous studies [7,8], it was observed that the corrosion resistance properties of Ti-6Al-4V improved with heat treatment, in both the Ringer’s and simulated body fluid (SBF) solutions
Other researchers have reported that the mechanical properties of Ti-6Al-4V alloy, including its impact toughness and microstructure, can be affected by the type of heat treatment and the aging period
Summary
Titanium alloys are used in orthopedic applications owing to their good biocompatibility, appropriate mechanical properties, and excellent corrosion resistance [1]. In some previous studies [7,8], it was observed that the corrosion resistance properties of Ti-6Al-4V improved with heat treatment, in both the Ringer’s and simulated body fluid (SBF) solutions. Other researchers have reported that the mechanical properties of Ti-6Al-4V alloy, including its impact toughness and microstructure, can be affected by the type of heat treatment and the aging period. They achieved significant improvement in both ultimate tensile and yield strengths through heat treatment at 960 ◦ C for 1 h, followed by water quenching and heat treatment at 500 ◦ C for 4 h and further air cooling. The electrochemical corrosion behavior of the heat-treated alloys was characterized in Ringer’s solution via potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS)
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