Interior of a corroded pipe. Pipe corrosion. (Photo: kittisak/Adobe Stock)

A typical failure mode of steel or cast iron water pipes is a result of corrosion. A common cause of corrosion-related failure is electric current traveling through the pipe and discharging. Figure 1 is a diagram showing how electric current traveling along a steel pipe causes localized corrosion. How does electric current find its way into a water pipe?

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