The primary mechanism by which polyphosphate corrosion inhibitors reduce corrosion in distribution systems is through the formation of a protective film on the internal surfaces of pipes. Corrosion in water distribution systems is an electrochemical process where metal from the pipe material dissolves into the water. Polyphosphates are a class of chemical compounds that contain multiple phosphate units linked together. When added to water, polyphosphates slowly hydrolyze (break down) into orthophosphates. Both polyphosphates and orthophosphates contribute to corrosion inhibition,....
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