Improvement of the corrosion resistance of biomedical Zr-Ti alloys using a thermal oxidation treatment
| Autor: | J.J. Santana, G. Bolat, Raquel Rodríguez-Raposo, Lucia Carmen Trinca, Luis Fernández-Mérida, Liviu Burtan, Ricardo M. Souto, Daniel Mareci, Javier Izquierdo |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science zr-ti binary alloys Oxide 02 engineering and technology 010402 general chemistry 01 natural sciences Zr-Ti binary alloys Corrosion chemistry.chemical_compound Scanning electrochemical microscopy Pitting corrosion General Materials Science lcsh:Mining engineering. Metallurgy Thermal oxidation Aqueous solution corrosion resistance Metals and Alloys biomaterial 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy Chemical engineering chemistry electrochemical techniques Surface modification 0210 nano-technology surface modification |
| Zdroj: | Metals, Vol 10, Iss 2, p 166 (2020) RIULL. Repositorio Institucional de la Universidad de La Laguna Universidad de La Laguna (ULL) Metals Volume 10 Issue 2 |
| Popis: | Binary Zr-Ti alloys spontaneously develop a tenacious and compact oxide layer when their fresh surface is exposed either to air or to aqueous environments. Electrochemical impedance spectroscopy (EIS) analysis of Zr-45Ti, Zr-25Ti, and Zr-5Ti exposed to simulated physiological solutions at 37 ° C evidences the formation of a non-sealing bilayer oxide film that accounts for the corrosion resistance of the materials. Unfortunately, these oxide layers may undergo breakdown and stable pitting corrosion regimes at anodic potentials within the range of those experienced in the human body under stress and surgical conditions. Improved corrosion resistance has been achieved by prior treatment of these alloys using thermal oxidation in air. EIS was employed to measure the corrosion resistance of the Zr-Ti alloys in simulated physiological solutions of a wide pH range (namely 3 &le pH &le 8) at 37 ° C, and the best results were obtained for the alloys pre-treated at 500 ° C. The formation of the passivating oxide layers in simulated physiological solution was monitored in situ using scanning electrochemical microscopy (SECM), finding a transition from an electrochemically active surface, characteristic of the bare metal, to the heterogeneous formation of oxide layers behaving as insulating surfaces towards electron transfer reactions. |
| Databáze: | OpenAIRE |
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