Research Progress on Internal Corrosion of Iron-metal Pipes of Water Distribution Systems

Iron-metal pipe is the most widely used in water distribution systems (WDS) in China, and its corrosion is the main cause of pipe network leakage and burst. In the process of long-term operation, the irregular corrosion scale produced by the corrosion of the inner wall of the pipe will not only reduce the conveying capacity of the WDS, but also lead to the phenomenon of “red water” caused by iron release, which seriously affects the safe and stable operation of the WDS. This paper respectively reviewed the research progress of internal corrosion of the iron-metal WDS from the following four aspects: the corrosion research methods, corrosion influence factors, pipe corrosion scales research, and the problem of corrosion caused by unconventional water entering the WDS. The limitations of the current WDS corrosion research was summarized, and then new methods and ideas of the WDS corrosion was put forward, in order to fundamentally control the corrosion problem of the iron-metal WDS, and reveal the cause of the water quality deterioration and the control mechanism of water quality stability. Finally, a solid theoretical foundation was established in order to ensure the safe operation of WDS.