The effects of cyclic stress on the polarization curve of SAC305 lead-free solder are investigated. It is found that stress increases the corrosion tendency of the material. The cyclic loading affects the corrosion current density response, which is manifested by the instantaneous surge of stress-induced current density. The cyclic stress with peak stress above yield strength significantly increases the stress-induced current density and promotes the occurrence of corrosion events. Furthermore, the effect of strain accumulation on passive film is in-situ characterized by real-time observation and digital image correlation (DIC) technique, which provides effective evidence for failure.