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
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/L NaCl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.
喷锌
自愈合
ductile cast iron
zinc coating
self-healing
Abstract
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 coating can provide cast iron pipes with effective cathodic and self-healing protection,thus delaying remarkably the time to first red rusting.
中图分类号 TG143.5
所属栏目
基金项目 江苏省高新技术产业化资助项目(JH01-071)
收稿日期 2007/1/11
修改稿日期 2007/4/19
网络出版日期
作者单位点击查看
备注焦俊(1981-),男,江苏泰兴人,硕士研究生.
引用该论文: JIAO Jun,CHEN Feng,CHEN Ming-ji,Gérard NOUAIL,SUN Shu. Anticorrosive Protection Effect of Zinc Coating on Ductile Cast Iron Pipes[J]. Materials for mechancial engineering, 2007, 31(11): 76～79
焦俊,陈锋,陈名佶,Gérard NOUAIL,孙恕. 喷锌涂层对球墨铸铁管的防腐蚀保护效应[J]. 机械工程材料, 2007, 31(11): 76～79
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【10】Abreu C M,Izquierdo M,Keddam M,et al.Electrochemical behaviour of zinc-rich epoxy paints in 3% NaCl solution[J].Electrochimica Acta,1996,41(15):2405-2415.
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