EVALUATION OF THE CORROSION RESISTANCE OF Ti-Mo-W ALLOYS IN SIMULATED BODY FLUID (SBF)

Titanium and its alloys due to their high strength-to-density ratio, excellent corrosion resistance and biocompatibility have an increasing use in the medical field and especially for implantology applications. The aim of this study is to investigate the influence of different contents of tungsten on the corrosion behavior of Ti -Mo-W alloys (where Mo = 15 wt.% and W = 5, 7, 9 and 11 wt.%) in simulated body fluid (SBF). The corrosion behavior in SBF of Ti -Mo-W alloys was studied by means of linear polarization technique by measuring the open circuit potential (EOC), for a period of 6 hours and plotting the Tafel curves from -200 mV (vs OCP) to +200 mV (vs OCP), with a scan rate of 0.167 mV / s. The tests were performed in SBF solution with a pH of 7.4 at the human body temperature (37 +/- 0.5 degrees C). Based on the polarization curves the electrochemical parameters of oxidation for the investigated alloys were determined.