Microstructure, Surface Characterization, and Electrochemical Behavior of New Ti-Zr-Ta-Ag Alloy in Simulated Human Electrolyte
Autor: | Petre Osiceanu, Jose Maria Calderon Moreno, Ecaterina Vasilescu, Maria Marcu, Silviu Iulian Drob, Daniela Ionita, Ioana Demetrescu, Ion Alexandru Popovici, Mariana Prodana, Cora Vasilescu |
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Rok vydání: | 2016 |
Předmět: |
Acicular
Materials science Scanning electron microscope 020209 energy Alloy Metallurgy Metals and Alloys 02 engineering and technology Electrolyte engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Corrosion Dielectric spectroscopy X-ray photoelectron spectroscopy Mechanics of Materials 0202 electrical engineering electronic engineering information engineering engineering 0210 nano-technology |
Zdroj: | Metallurgical and Materials Transactions A. 48:513-523 |
ISSN: | 1543-1940 1073-5623 |
Popis: | A new Ti-20Zr-5Ta-2Ag alloy was elaborated and characterized regarding its microstructure, its native passive film composition and thickness, its surface wettability, its electrochemical behavior in Ringer solution of different pH values, and its ion release. The new alloy has a bi-phase, α + β, acicular, homogeneous microstructure (scanning electron microscopy (SEM)). Its native passive film (12-nm thicknesses) consists of the protective TiO2, ZrO2, and Ta2O5 oxides, Ti and Ta suboxides, and metallic Ag (X-ray photoelectron spectroscopy (XPS) data). The alloy possesses high hydrophilic properties. The main electrochemical parameters of the new alloy are superior to those of Ti as a result of the beneficial influence of Zr, Ta, and Ag alloying elements, which reinforce its native passive film. Electrochemical impedance spectroscopy (EIS) spectra in Ringer solutions for the new alloy displayed better values of impedances and phase angles, proving a more insulate passive film than that on the Ti surface. The main corrosion parameters for the new Ti-20Zr-5Ta-2Ag alloy are more favorable by about 25 to 38 times than those of Ti, confirming extremely resistant passive film. The new Ti-20Zr-5Ta-2Ag alloy releases into Ringer solution low quantities of Ti4+, Zr4+ metallic ions (inductively coupled plasma–mass spectroscopy (ICP-MS)). The Ag+ ions are released in low quantity, conferring to this alloy’s low antibacterial activity. All experimental results show that the new Ti-20Zr-5Ta-2Ag alloy fulfills the requirements for biocompatibility, corrosion resistance, and antibacterial protection. |
Databáze: | OpenAIRE |
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