Corrosion failure analysis on water pipeline

Corrosion failure of water pipelines was analyzed by means of corrosion morphology observation, corrosion product analysis by using SEM, XRD and EDS technologies, as well as analysis of physical and chemical properties of underground water and coal ash and the property of microbe nearby the pipelines. The results showed that the corrosion failure of water pipelines was due to the effect of oxygen concentration difference cell formed as the pipelines suronded by water containing coal ash and silty clay. However, the pipelines were not affected by stray current corrosion and microbiological influenced corrosion. Meanwhile, the entire lose effective of the coating for pipelines resulted form the strong corrosiveness of underground water was the important factor responsible to the rapid corrosion failure of pipelines.