Galvanic Series of Metals Conventionally Used in Tap Water With and Without Flow and Its Comparison to That in Seawater

Abstract

Abstract Galvanic series of 17 metals often used in aerated tap water was determined by measuring corrosion potential. Experimental conditions were selected in considering such systems as water supply, water cooling, water heating, and water condensing. Galvanic series in seawater is easily obtainable. However, very little data on galvanic series in tap water are available in spite of its importance in life lines. The authors found that the time changes of corrosion potential could be classified into five types depending on metals. Galvanic series in tap water was compared to that in seawater. Effect of flow is also discussed. The main results in tap water are that the potential of aluminum does not settle down; the position of stainless steel and copper alloys including pure copper is reversed by applying the flow; the potential of lead is more active than in seawater in contrast to the other metals; the potential differences between stainless steels and copper alloys including pure copper is much smalle...