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Electrochemical study on corrosion process of cement-mortar-linedductile cast iron pipe under water supply(PDF)


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Electrochemical study on corrosion process of cement-mortar-linedductile cast iron pipe under water supply
Qiu LinfengZuo XiaobaoTang YujuanYin GuangjiTang Honggang
School of Science,Nanjing University of Science and Technology,Nanjing 210094,China
linear polarization resistance electrochemical impedance spectroscopy ductile cast iron pipes cement-mortar lining corrosion current density
Based on the corrosion process of cement-mortar-lined ductile cast iron pipes under the water supply,the specimens of the cement-mortar-lined ductile iron circular ring are designed and prepared.After immersing these specimens into the perturbed solutions of pure water、6M ammonium nitrate and 6M ammonium chloride,the linear polarization resistance(LPR)and the electrochemical impedance spectroscopy(EIS)measurements are carried out on the specimens.The changes of electrochemical parameters such as the polarization resistance and the corrosion current density with the corrosion time are analyzed,and the corrosion degree of the specimens is evaluated.Results show that,during the 120-day corrosion,the resistance of the cement-mortar lining,the charge transfer resistance on the surface of the ductile cast iron and the corrosion current density of the specimens in pure water have little change.In the 6M ammonium nitrate solution,the resistance of the cement-mortar lining decreases obviously,and the charge transfer resistance and the corrosion current density have almost no changes.In the 6M ammonium chloride solution,both the resistance of the cement-mortar lining and the charge transfer resistance decrease obviously,and the corrosion current density is much larger than the depassivation critical value.The corrosion degree of the specimens of the LPR is basically in agreement with that of the EIS.


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Last Update: 2017-04-30