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Corrosion characteristics of ductile iron (DI) pipe specimen lined cement mortar (CM) layer were investigated by the electrochemical and microscopic analysis when placed in flowing purified water, 6M NH4NO3 solution and 6M NH4Cl solution for 120 days, respectively. Electrochemical characteristics of specimen were evaluated by OCP, PDP and EIS. Meanwhile, the microstructural morphology and phase composition of leached CM lining and corroded CM-DI interfacial zone in the specimen were characterized by SEM/EDS and XRD. Results show that, the CM lining and DI surface of specimen have different corrosion characteristics in three flowing solutions, and the specimen in flowing purified water has basically no leaching of CM lining and corrosion of CM-DI interfacial zone. But, there are obvious leaching of the CM lining and no corrosion of CM-DI interfacial zone of specimen in flowing NH4NO3 solution. However, severe corrosion occurs on the CM lining and DI surface of the specimen in flowing NH4Cl solution for 120 days.

Electrochemical and Microscopic Study on Corrosion Characteristics of Cement-Mortar-Lined Ductile Iron Pipe in Flowing Solutions