AWWA ACE65251

This powerpoint presentation begins by providing background information on copper pitting and states the objective of bench scale studies of copper inhibitors as investigating the effects of zinc, phosphate, and zinc phosphate on electrochemical measurements. Materials and methods include: known pitting water; electrochemical measurements for voltage, current, and corrosion potential. Large scale recirculation rig studies were done to investigate the effects of phosphate and zinc phosphate on electrochemical measurements in a continuous flow system. The study involved a third study to investigate the effects of the following inhibitors on electrochemical measurements and pit formation in a continuous flow system: control (no inhibitor); polyphosphate; orthophosphate; zinc; and, zinc orthophosphate.