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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7.61×10-4m A/cm~2,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5.26×10-4m A/cm~2,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.
In order to study the corrosion characteristics of feed ductile iron pipes and the influence of corrosion on water quality, a three-electrode reaction system was mainly made of ductile iron pipes. Electrochemical corrosion parameters of ductile iron pipes were determined by using micro-organisms as control variables. The results showed that the self-corrosion potential of non-sterilizing group was -0.515 V for 66 days and 7.61 × 10-4 m A / cm 2 for self-corrosion current density, the water quality deteriorated quickly and the total iron concentration was 3 days The standard, color and turbidity reached 72,115 NTU respectively.The average self-corrosion current density of sterilization group was -0.471 V and that of self-corrosion current was 5.26 × 10-4mA / cm ~ 2, But the water eventually becomes “yellow water.” The feedwater ductile iron pipe exposed to water without or with an anticorrosive coating is highly susceptible to early-stage electrochemical corrosion-based synthetic corrosion that seriously affects water quality.