CORROSION RESISTANCE OF TITANIUM AND SOME DENTAL IMPLANT ALLOY IN BIOLOGICAL FLUIDS

摘要

The main purpose of this paper is the study of the long-term corrosion resistance of the titanium and dental alloy Ti-5Al-4V in physiological serum and artificial saliva of different pHs (acid and neutral) at 37°C, reproducing the various biological environments that can be in contact with dental implants. The potentiostatic, potentiodynamic and linear polarisation measurements have been used to characterise the corrosion resistance of these materials during a period of about 1500 exposure hours. Also, the variation of open circuit potentials in time and with pH has been recorded for the same term. The potential gradients resulted from the pH changes were calculated; also, their variation in time were simulated for extreme, hypothetical conditions. The corrosion rates were determined.