Abstract: Polarization curves and electrochemical parameters of four kinds of titanium alloys (TC4,TC11,TA7 and TA12) were measured in six alcohol solutions with the potentiodynamic method. The effects of H₂O and Cl^- were mainly investigated. It was found that the pitting corrosion resistance of the alloys was somehow improved when the certain amount of H₂O was added in the alcohol solutions and greatly decreased by Cl^- in the solutions. Cl^- would obviously change titanium alloys from a self-passivation state into an active one.