Galvanic Series of Seventeen Metals Conventionally Used in Tap Water with and without Flow and its Comparison to that in Sea Water

Galvanic series of seventeen 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 sea water are obtainable easily. However, very few data on galvanic series in tap water are available in spite of its extraordinary importance in life lines. The authors found that the time changes of corrosion potential could be categorized to 5 types depending on the nature of metals. Galvanic series in tap water was compared to that in sea water. The effect of flow was also discussed. The main results concerning galvanic series in tap water are; (1)  the potential of aluminum does not settle down, (2)  the position of stainless steel and copper alloys including pure copper is inversed by giving the flow, (3)  the potential of lead is less noble than in sea water, (4)  the potential difference between stainless steels and copper alloys including pure copper is much smaller than in sea water.