喷锌涂层对球墨铸铁管的防腐蚀保护效应  

Anticorrosive Protection Effect of Zinc Coating on Ductile Cast Iron Pipes

作　　者：焦俊[1] 陈锋[1] 陈名佶[1] Gérard NOUAIL 孙恕 

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 [3]圣戈班管道系统有限公司(中国),安徽马鞍山243052

出　　处：《机械工程材料》2007年第11期76-79,共4页Materials For Mechanical Engineering

基　　金：江苏省高新技术产业化资助项目(JH01-071)

摘　　要：采用电化学"二电极"方法,定期测定了沥青和喷锌(130 g/m2)球墨铸铁管在5 g/LNaCl溶液中电位的变化规律,并观察记录试样损伤处首次出现红锈的时间及形貌演变。结果表明:铁的保护电位为-0.780 V,试样电位高于-0.780 V即有红锈出现;相对于沥青涂层,喷锌层对铸铁管防腐蚀提供了有效的阴极保护及自愈合保护,能使首次红锈出现的时间显著延迟。Bitumen painted and zinc coated(130 g/m2) ductile cast iron pipe samples with damages were immersed in 5 g/L NaCl solution,the evolution of the electrochemical potential of the samples was measured periodically using electrochemical "two-electrodes" technique,and the time to first red rusting and the morphology evolution of the damaged area were recorded.The results indicate that the protective potential of iron is-0.780 V above which red rusting will appear.Compared to bitumen painting,zinc coati...

关 键 词：球墨铸铁 喷锌 自愈合 

分 类 号：TG174.4[金属学及工艺—金属表面处理]