Abstract:The corrosion behaviors of copper in acidic soil acidified with simulated acid rain(SAR) were studied by means of polarization curves, electrochemical impedance spectroscopy(EIS), scanning electron microscopy(SEM) and ray diffraction (XRD). The results indicated that the SAR increased the corrosion rate of copper in acidic soil. The corrosion rate of copper increased with decreasing SAR pH. Corrosive characteristics of the soil obviously increased because of the leaching of the acid rain. For the leaching of the distilled water, the corrosion rate of copper decreased. The EIS of copper was a capacitive loop in the early stage of corrosion. After 60 days exposure, EIS consisted of two capacitive arcs for the leaching of SAR, indicating that the control step of corrosion was the charge transfer process. For leaching the distilled water, EIS consisted of a capacitive loop at high frequency region and a Warburg impedance at low frequency region, which implied that the control step was the diffusion controlled process. The corrosion products of copper surface were mainly composed of Cu2O, CuO and some soil components such as SiO2.