Iron corrosion in occluded water in drinking water distribution systems

Abstract

Corrosion in drinking water distribution systems is a serious problem and has attracted increasing attention. This work characterizes the iron corrosion in occluded water and provides a perspective of many pipeline leakage incidents, especially the hidden leakage in pipes. Corrosion products were analysed, and the corrosion rate and behaviour of cast iron were compared by potentiodynamic polarization and electrochemical impedance spectroscopy measurements in occluded water and flowing water separately. In addition, a conceptual model of iron corrosion demonstrated complex interactions. This work extends the knowledge of the corrosion mechanism for local corrosion and the propagation of water leakage.