采用电化学阻抗谱(EIS)，以同材料三电极为测试体系研究了Q235钢、紫铜和热镀锌钢在土壤中的腐蚀行为，采用金相显微镜观察了腐蚀产物形貌，并比较了紫铜和热镀锌钢的耐蚀性。结果表明，Q235钢发生了较严重的腐蚀，腐蚀产物层疏松，腐蚀介质在产物层中浓缩，造成了Q235钢的点蚀; 紫铜表面生成了致密的灰褐色钝化膜，膜层电阻随时间上升，在第9天时最高，之后维持稳定; 热镀锌钢表面生成了淡黄色的疏松覆盖层，镀层电阻随时间先升后降，在第5天时最大，镀层具有一定的自修复功能。紫铜耐蚀强于热镀锌钢。

Corrosion behavior of Q235 steel, red copper and hot dip galvanized (HDG) steel in soil was studied by EIS, using a new kind of same material three-electrode. Morphology of corrosion product was observed by metallographic microscope, and corrosion resistance of red copper and HDG steel was compared. The results showed that Q235 steel was corroded heavily with loose corrosion product layer formed, the steel suffered pitting at later stage due to the concentration of corrosive ions in the product layer. Dust-color compact passive film was formed on the red copper surface, film resistance increased with corrosion time and was stable after a max value at the 9th day. Yellow loose covering layer formed on the urface of red copper. Coating resistance of HDG ateel increased first and decreased later with a max value at the 5th day, self-repairing function was found in the coating. Corrosion resistance of red copper is stranger than that of HDG steel.