| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preventing corrosion of a cast iron pipe by using a coating material which can be coated on the surface of white rust produced in outdoor temporary placing and on white rust produced in steam curing. SOLUTION: This method for preventing corrosion of cast iron pipe comprises the steps of (1) thermally spraying zinc, zinc-aluminum pseudoalloy, or zinc-aluminum alloy to form a thermal spray coating layer onto the outer surface of a cast iron pipe, (2) coating an aqueous two-component epoxy emulsion coating material having a solid content of not less than 5% by weight and comprising a first component of an epoxy resin having an epoxy equivalent of 475 to 1,800 and a second component of an amine curing agent having an active hydrogen equivalent (on a solid basis) of 160 to 600 onto the outer surface of the cast iron pipe to form an epoxy resin film, and (3) coating an acrylic emulsion coating material having a solid content of not less than 15% by weight on the epoxy resin film to form an acrylic resin film. COPYRIGHT: (C)2006,JPO&NCIPI
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