<p>This paper investigated the combined influence of alternating current (AC) and solution temperature on the corrosion performance of Ti-6Al-4V (TC4) alloy in simulated marine environment by electrochemical measurements, immersion test and surface morphology analysis. The results indicate that TC4 alloy exhibits great corrosion sensitivity to low AC current density, as evidenced by the appearance of zero-current potential, the reduced E_p and the increased i_p. AC mainly affects the anodic region, disrupting the formation reaction and stability of passivation film. When AC current density (i_AC) increases, the number and size of holes in the passive film augment, which diminishes the protectiveness of surface film. And the corrosion characteristic of the alloy transforms from shallow corroded area to dense and deep corrosion pits. Furthermore, the combined influence of rising i_AC and temperature enhances the migration rate of harmful ions, remarkably increases the donor density, facilitates the dissolution of passive film, and heightens the degree of corrosion pits on the alloy. The production of pitting is attributed to the preferential dissolution of Ti and Al.</p>