摘要 |
PROBLEM TO BE SOLVED: To provide heavy corrosion preventive coated steel having excellent peeling resisting corrosion preventability in response to that it is needed to extereamely extend the service life of the heavy corrosion preventive steel and it is necessary to obtain a method low in cost and satisfactory in productivity other than the coating of titanium metal. SOLUTION: An oxygen shielding coating film is formed on the surface of a heavy corrosion preventive covering consisting of a coated covering by polyurethane or the like. For example, the conventional heavy corrosion preventive covering or a heavy corrosion preventive covering obtained by subjecting a substrate with chemical conversion treatment is stacked with a coating film 5. By the oxygen shielding coating film, oxygen penetrating from the upper part of the covering is suppressed, and the destruction of the stuck boundaries is suppressed, so that the propagation of deterioration in the sticking from the edge parts and damaged parts of the covering can be suppressed. In this way, the corrosion preventive coated covering having higher reliability than heretofore one can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI
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