Corrosion behavior of water pipe metals in electrolyzed water

Abstract

Electrolyzed water obtained by electrolyzing dilute saline solution has been widely used for sterilization and disinfection owing its excellent bactericidal activity. Corrosion behavior of metals was examined in the water in the present study. The metals involved pure aluminum, pure copper, rolled steel, 18-8 stainless steel and zinc-plated steel. The specimen was prepared by cutting each sheet into rectangular plate 1.5x1.5x0.5mm. The specimen was immersed in 30ml testing water, strong acid electrolyzed water, neutral electrolyzed water and tap water for 3, 6, 12 and 24hr. The strong acid water was severely corrosive to the metals. The neutral water showed much less corrosiveness similarly to tap water except for the rolled steel which was tarnished after 3hr immersion leaving brownish precipitates.