Corrosion behaviour of the studied Ti12Mo and Ti12Mo5Ta alloys together with the currently used metallic biomaterials commercial pure titanium (cp-Ti) were investigated for dental applications. All the samples were examined using electrochemical techniques: open circuit potential, potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) in artificial saliva at 25 oC. The electrochemical corrosion properties of all the titanium samples in artificial saliva were measured in terms of zero current potential (ZCP) and corrosion current density (icorr). The EIS technique was applied to study the nature of the passive film formed on all the samples at various impressed potentials: 0 V (SCE), 0.5 V (SCE) and 1 V (SCE). Equivalent circuits (EC) were used to modeling EIS data, in order to characterize samples surface and better understanding the effect of Mo and Ta addition on the cp-Ti..