Effect of Fluoride Concentration and pH on Corrosion Behavior of Ti–15Mo in Artificial Saliva
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Corrosion behavior of Ti–15Mo alloy in artificial saliva containing variation in pH (7.2, 3.5) and varying concentrations of fluoride ions (2500, 5000 and 10,000 ppm) was evaluated using potentiodynamic polarization, electrochemical impedance spectroscopy studies to ascertain its suitability for dental implant applications. The study reveals that there is a strong dependence of the corrosion resistance of Ti–15Mo alloy on the concentration of fluoride ions in the electrolyte medium. Surface morphological characterization was carried out using SEM–EDAX to investigate the corrosion resistance in artificial saliva containing sodium fluoride at various pH conditions, and it was found that the surface roughness of the specimens was highly increased at pH 3.5. In spite of the active dissolution, the Ti–15Mo alloy exhibits passivity at anodic potentials at all concentrations of the fluoride ions studied. The results suggest that Ti–15Mo alloy can be a suitable alternative for dental implant applications.
KeywordsTi–15Mo alloy Corrosion resistance Fluoride Dental implant pH Artificial saliva
The authors acknowledge the Indian Council for Medical Research (ICMR), New Delhi, for their financial support.
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