Impact of types of water source on pipeline corrosion: a comprehensive electrochemical and microscopic analysis

ABSTRACT Switching water sources is essential for effective water resource management and pipeline maintenance, ensuring water supply stability and reducing reliance on a single source. However, improper water source selection can disrupt the chemical balance within pipelines and accelerate corrosion. This study simulated the process of switching water sources and employed electrochemical analysis, such as scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, to investigate the impact of water source switching on pipeline corrosion. During the initial switching phase, severe pipeline corrosion was observed, along with significant variations in water quality indicators that substantially influenced corrosion. Electrochemical analysis revealed a decrease in pipeline open circuit potential and a negative shift in the polarization curve, indicating an increased tendency for corrosion. Corrosion could be relieved as the pipeline adapted to the new water quality. Microscopic analysis demonstrated that switching water sources affected the structure and stability of the corrosion product film. Investigations into different water source switching ratios indicated that corrosion levels should not be evaluated based on a single parameter; an appropriate blend of water sources is necessary to effectively mitigate corrosion. This study provides valuable insights for water source management, pipeline maintenance, and efficient water supply strategies.