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Control of External Corrosion on Iron and Steel Watermains

Published: 20040803 by EPIC Educational Program Innovations Center
Author(s): Robert Gummow

External corrosion of iron watermains has been a problem for municipalities for over 100 years. The three main causes of corrosion, in a historical context are:

  • stray currents from electrified transit systems
  • dissimilar soils
  • galvanic corrosion

All of these causes remain with us today, although to varying degrees.