Author:

Keywords:

Titanium, Fluoride, Ti6Al4V, Electrochemical tests, Surface analysis, Science & Technology, Technology, Materials Science, Biomaterials, Materials Science, CORROSION BEHAVIOR, HYDROFLUORIC-ACID, ARTIFICIAL SALIVA, WEAR PARTICLES, ALLOYS, RESISTANCE, TI-6AL-4V, IMPLANT, PH, TI, Alloys, Corrosion, Electrochemistry, Fluorides, In Vitro Techniques, Materials Testing, Mouth, Saliva, Artificial, Spectrum Analysis, Surface Properties, 0903 Biomedical Engineering, 0912 Materials Engineering, Biomedical Engineering, 4003 Biomedical engineering, 4016 Materials engineering

Abstract:

The purpose of this work was to evaluate the corrosion of commercially pure (CP) titanium and Ti6Al4V in vitro at different F(-) concentrations regularly found in the oral cavity by using different electrochemical tests and surface analysis techniques. electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) and potentiodynamic polarization tests were associated to advanced characterization techniques such as SEM, EDS, AFM, ICP-MS and XPS. OCP tests revealed a higher reactivity of both CP titanium and Ti6Al4V at 12,300ppm F(-) concentration than that recorded at 227ppm F(-). Also, a significant decrease of the corrosion resistance of both materials was noticed by EIS in fluoride solutions. Material loss caused by corrosion was noticed on titanium surfaces by SEM and AFM in the presence of high F(-) concentration. CP titanium degraded by pitting corrosion while Ti6Al4V suffered from general corrosion showing micro-cracks on surface. Furthermore, a high release of metallic ions from the test samples after immersion at high F(-) concentrations was detected by ICP-MS, that can be potentially toxic to oral tissues.