Electrochemical characterization of ZrTi alloys for biomedical applications

Abstract

The electrochemical behaviour of three ZrTi alloys (Zr5Ti, Zr25Ti and Zr45Ti) in Ringer's solution has been investigated. Their resistance against localized corrosion has been determined from cyclic potentiodynamic polarization (CCP) and electrochemical impedance spectroscopy (EIS) measurements, whereas scanning electrochemical microscopy (SECM) was applied to investigate the local reactivity of the passive films developed on the materials, and scanning electron microscopy (SEM) was employed to characterize the surface morphology of the alloys subjected to anodic polarization. An increased reactivity could be detected with SECM when the metal samples were polarized at +0.50 VSHE, though the extent of this feature greatly depended on the nature of the metallic material. At 37 0 C, the Zr5Ti alloy was susceptible to localized corrosion. Though Zr25Ti alloy presented rather low pitting potential, the spontaneous corrosion potential of the material was sufficiently negative to require overpotentials around 600 mV for breakdown to occur. Finally, the Zr45Ti alloy exhibited a larger passive range in the polarization curve, and it was resistant to localized corrosion.

Effect of thermal oxidation on electrochemical corrosion behaviour of ZrTi alloys for dental applications

“…Localized corrosion can be very harmful and it is known that zirconium is susceptible to localized corrosion induced by chloride ions . However it was reported that the addition of Ti to Zr reduces the susceptibility of the localized corrosion . Transition metal/oxide interfaces have been attracted because they are used in many applications .…”

MRI-compatible Nb–60Ta–2Zr alloy for vascular stents: Electrochemical corrosion behavior in simulated plasma solution

“…7(c). This type of EC has been widely used for valve metals, including Ti, Nb, Ta and Zr, as reported in previous work [28,[30][31][32], and it has been established based on Macdonald's Point Defect Model [33]. This model provides a picture of the formation of oxide films in terms of the generation and transport of cation and anion vacancies in a constant electric field.…”

Biological responses of human bone mesenchymal stem cells to Ti and TiZr implant materials

“…In 1965, pure titanium implants were used clinically and long-term cases were studied, allowing the effects of implants to be tracked and observed. [5][6][7][8] It is osseointegration that leads to the success of implantation. Nowadays, titanium (Ti) is most widely used in clinical oral implants; nevertheless, the mechanical/ tensile strength of cpTi is deficient.…”