Titanium and its alloys are recognized as biocompatible materials for use in medical devices. During the last few years a new generation of Ti alloys has been created with the aim of removing vanadium as an alloying element (e.g. in Ti-6Al-4V), the potential cytotoxic effect of which has been demonstrated in several investigations. The scope of the present work is to establish the corrosion behaviors of some new titanium alloys(Ti75 alloy, TiZr alloy)in 0.9% NaCl electrolyte and in particular under biological conditions. The results showed that the new alloys generally exhibit good electrochemical behaviors in rest potential (Er), corrosion potential (Ec) and passive current density (Ip). A remarkable difference is encountered with respect to the electrolyte RPMI alone induces a favorable Ec and an increased Ip, whereas the presence of cells decreases the Ip and the Ec with respect to 0.9% NaCl and RPMI. So RPMI with or without cells is a more relevant physical electrolyte than 0.9% NaCl. The new titanium alloys show by their electrochemical behavior some advantages as compared to Ti6Al4V.