The pitting potential,E_pit, of the passive layer on the implant alloy can be treated as an accelerated laboratory test to assessment a susceptibility to pitting corrosion of metallic biomaterials in simulated body fluids. This study deals with an evaluation ofE_pitof the self-passivated TiO₂layer formed on the surface of the NiTi implant alloy as a function of the scan rate of polarization. Cyclic potentiodynamic studies were performed in Ringer’s solution at 37°C. It was found out that the more noble value ofE_pitin the range of 0.99-2 V was registered at a given polarization scan rate that ranged from 0.16 to 2 mV s^-1, the lower susceptibility of the self-passivated NiTi implant alloy to the initiation of pits was detected.