Titanium is the best metal for making dental implants and restorations. In the last decade, new titanium alloys have been developed in different areas of dentistry. Concurrently, treatments using fluoride supplementation, such as odontology fluoride containing gels, have also been widely used in odontology.The aim of this study is to investigate the electrochemical behaviour of a new titanium alloy containing Cu and Ag, in fluoridecontaining media, and compare it with the behavior of Ti and Ti6Al4V, which are used frequently as biomaterials. Open circuit potential, polarization resistance and electrochemical impedance spectroscopy measurements revealed that the corrosion resistance of titanium and its alloys is controlled by the fluoride ion concentration and the pH of the solution. The presence of F À ions in neutral solution does not hinder the formation of a protective layer of Ti and its alloys. Thus, the corrosion resistance of Ti is maintained in this medium. However, the corrosion of Ti and its alloys are enhanced in an acidic environment, because F À ions in the solution combines with H þ ion to form HF, even in low fluoride concentration.
The effect of fluoride ion concentration and pH on the corrosion behavior of TCA (60 Ti 10 Ag 30 Cu), which is a new Ti alloy with low melting point, pure Titanium (Ti), and TAV (TiAl6V4) was examined using open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) at different potentials. Results show that the corrosion resistance of TCA and Ti decrease at anodic potentials compared with results obtained at OCP. At one potential the corrosion resistance decrease depends on NaF concentration and pH. TAV shows less resistance against corrosion in fluoride containing saliva. TCA has potentials more positive than Ti and TAV due to surface enrichment of Cu and Ag as Ti dissolves which accelerates the cathodic reaction. Fluoride ion may not hinder the growth of oxide layers on the surfaces of the electrodes. It will have influence on the properties of the oxide layer causing them to be not protective against corrosion in acid media containing fluoride ions.
The electrochemical behavior of Ti-6Al-7Nb was investigated, and compared with that of Ti-6Al-4V alloy, which is commonly used as implant material, particularly for dentistry, orthopaedic and osteosynthesis applications. The aim of present study was to evaluate their corrosion resistance in an artificial physiological conditions using Hanks solution at 37 • C. This evaluation was carried out through the analysis of the potentiodynamic polarization (PD), and electrochemical impedance spectroscopy (EIS) tests. Very low current densities were obtained from the PD curves, indicating a typical passive behavior for two investigated alloys. The EIS results at open circuit potential and at different potential exhibited capacitive behavior (high corrosion resistance) with phase angles close to −90• and high impedance values at low and medium frequencies, which are indicative of the formation of a highly stable film on these alloys in the test solution. The resistance of TAN is slightly higher than that of TAV. This difference can be attributed to the alloying elements. For TAN, the formation of Nb 2 O 5 oxide, which is chemically more stable and less soluble compared to V 2 O 5 formed on the Ti-6Al-4V alloy, enhances resistance to dissolution of the surface film. Thus, it has been suggested that Ti-6Al-7Nb can be a better alternative to Ti6Al-4V in simulated body fluid environment.
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