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A cementitious coating is applied to a thin smooth, corrosion-protective coating of a pipe to protect the corrosion-protective coating against physical damage and hostile environments. The cementitious coating adheres to the corrosion-protective coating, is typically between 0.5 and 5.0 millimeters

A cementitious coating is applied to a thin smooth, corrosion-protective coating of a pipe to protect the corrosion-protective coating against physical damage and hostile environments. The cementitious coating adheres to the corrosion-protective coating, is typically between 0.5 and 5.0 millimeters in thickness, and contains a cementitious material such as portland cement, a polymeric material such as an acrylic polymer, and may also contain chopped fibres such as glass fibres and a filler material such as silica sand. The cementitious coating has sufficient conductivity to permit a cathodic protection current to flow therethrough. The cementitious coating may also be applied to the corrosion protective coating of the metal substrates. Polymer bonded coatings may alternatively be so applied, to protect the corrosion protective coating.

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In combination with an elongated metal pipe having a thin smooth corrosion protective coating thereon, said corrosion protective coating being one of an epoxy coating, a polyethylene coating, a polyurethane coating and a coal tar coating, a thin cementitious coating adhered to said corrosion protect

In combination with an elongated metal pipe having a thin smooth corrosion protective coating thereon, said corrosion protective coating being one of an epoxy coating, a polyethylene coating, a polyurethane coating and a coal tar coating, a thin cementitious coating adhered to said corrosion protective coating to provide protection for said corrosion protective coating, said cementitious coating being capable of flexing with said pipe and comprising: a cementitious material, a fine filler material of quantity in the range of 0 to 3.5 parts by weight per part of said cementitious material, a polymeric material of quantity in the range 0.05 to 0.55 parts by weight of polymer solids per part of said cementitious material, chopped fibres or flakes of quantity in the range 0 to 0.20 parts by weight per part of said cementitious material, the thickness of said cementitious coating being between 0.5 to 5.0 millimeters, said coating adhering to said corrosion protective coating, said cementitious coating having substantial electrical conductivity when saturated with water, to enable cathodic protection of said pipe by an electric current conducted through said cementitious coating.