| 摘要 |
PROBLEM TO BE SOLVED: To provide heavy corrosion protection-coated steel excellent in cathode peeling resistance at a high temperature of 100 deg.C and also high in reliability. SOLUTION: The surface of steel subjected to substrate treatment is coated with galvanizing 2, a chromate treated layer 3 containing dry type silica fine particles is formed thereon, and after that, a resin primer layer 4 and a corrosion protection coated layer 5 having a thickness of >=0.3 mm are successively laminated and applied thereon. Since defective parts in which iron is exposed to the surface of the steel are eliminated by galvanizing, its cathode peeling resistance at high temperature can be suppressed, so that corrosion protection coating high in reliability is realized. |
