A three⁃electrode cell has been developed to investigate corrosion characteristics of cast iron pipe and impact of the corrosion on water quality. The cast iron pipe corrosion parameters were measured by electrochemical workstation with microbe as controlled variable. The water quality was analysed in the corrosion system meanwhile. The results indicated that the average free⁃corrosion potential of the cast iron pipe was -0. 515 V in non⁃sterile group during 66 days and the free⁃corrosion current was 7.61×10-4 mA/cm2, while the parameters for the reference group were -0.471 V and 5. 26 × 10-4 mA/cm2 , respectively. The water in non⁃sterile group deteriorated quickly with total iron exceeding 0. 3 mg/L 3 days later. And chroma and turbidity of the water were 70 and 115 NTU. Corrosion rate of reference group was lower compared to non⁃sterile group, while the water became "red water"finally. Cast iron pipelines are prone to comprehensive corrosion characterized by electrochemical corrosion when there is little anti⁃corrosive coating on internal wall, leading to water quality deterioration.%为研究给水球墨铸铁管腐蚀特性及腐蚀对水质的影响，以球墨铸铁管为主体制作三电极反应体系，以微生物为控制变量利用电化学工作站测定球墨铸铁管电化学腐蚀参数，同时分析腐蚀体系内水体水质变化．结果表明：非灭菌组自腐蚀电位66 d均值－0．515 V，自腐蚀电流密度均值7．61×10－4 mA／cm2，期间水质迅速变差，总铁质量浓度3 d后超标，色度和浊度最终分别达72、115 NTU．灭菌组自腐蚀电位66 d均值－0．471 V，自腐蚀电流密度均值5．26×10－4 mA／cm2，腐蚀强度较灭菌组稍缓，但水体最终变成“黄水”．没有或失去防腐涂层而暴露于水体中的给水球墨铸铁管初期极易发生以电化学腐蚀为主的综合性腐蚀，严重影响水质．
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