Stray current is a product of fancy as well as the Nessie of Scotland.

What is it about?

So far, the electrolytic corrosion of pipelines buried underground is assumed to be caused by the stray current leaking from the railway trucks of DC (direct current) drive train. This is, however, an absurd misunderstanding because soils and solutions adhering are insulators (having no free electrons), and therefor they cannot convey DC current (flow of free electrons). On the other hand, AC (alternating current) causes the electric shock (leakage from metallic wires) and, it is used for the measurement of the electric conductivity of solutions. However, AC cannot cause corrosion. Then, what causes the electrolytic corrosion of pipelines?

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Why is it important?

How do you deal with these when the potential of your underground pipeline goes down to -8000 mV, or fluctuates violently without pause? By reading this paper, you can at least get the causes.