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http://uploadboy.me/pika710kcqa9/Fundamentals of Metallic Corrosion in Fresh Water By JR Rossum.zip
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"When water contains less iron than the maximum that it is capable of carrying in
solution, it corrodes iron or steel rapidly - unless a protective film or crust of
some material covers the metal surface. The unsaturated water tends to dissolve
metal from the surface of well screens, well casing or piping systems until it
becomes saturated with respect to iron. If the mineral content of the water is such
that a protective film is not formed by deposition of insoluble materials, severe
corrosion results."
Fundamentals of Metallic Corrosion in Fresh Water By J.R. Rossum