锌层质量对球墨铸管防腐蚀效果的影响  

Effect of Zinc Coatings with Different Unit Area Weight on the Corrosion Behavior of Ductile Cast Iron Pipes

作　　者：焦俊[1] 陈名佶[1] 陈锋[1] Gérard NOUAIL 孙恕[3] 宋书燕 薛纪二[5] 

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]圣戈班穆松桥研发中心,法国 [3]圣戈班管道系统有限公司(中国),安徽马鞍山243052 [4]中国水协管道物资部,北京100055 [5]中国农业机械化科学研究院工艺材料研究所,北京100083

出　　处：《材料保护》2008年第3期65-67,共3页Materials Protection

摘　　要：采用"二电极"电化学方法,定期测定三种质量喷锌层的球墨铸铁管样品在5g/L NaCl溶液中电位的变化规律,并观察样品首次出现红锈的时间。试验发现,随喷锌层单位面积质量增加,其对球墨铸铁管基体的防腐蚀效果呈非线性改善。比较三种锌重的相对保护周期,并考虑喷锌成本,建议球墨铸铁管采用200g/m2的喷锌工艺。Ductile cast iron pipe samples coated with zinc coatings of different unit area weight (90,130 g/m2 and 200 g/m2) were immersed in 5 g/L NaCl solution, and the evolution of the electrochemical potential of the samples was measured periodically using electrochemical two -electrodes technique. The duration for the initial red rusting to e-merge was also recorded. It was found that the anticorroaive performance of the samples was enhanced non-linearly with increasing unit area weight of the zinc coating. Considering the duration of galvanic protection of the zinc coatings with different unit rear weight and the cost of zinc coating process, it was suggested to use the zinc coating with a unit area weight of 200 g/m2 for the an-ticorrosion protection of ductile cast iron pipes.

关 键 词：喷锌 球墨铸铁 防腐蚀 

分 类 号：TG174.44[金属学及工艺—金属表面处理]