| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly corrosion-proof coated steel material excellent in corrosion-proof properties such as water resistance, cathodic peeling resistance, adhesion or impact resistance and capable of certainly preventing corrosion and the destruction of a piping, a container or a structure accompanied thereby even if used over a long period of time in the ground, harbor or rivers. SOLUTION: In a highly corrosion-proof coated steel material obtained by applying pretreatment to the whole or a part of the surface of a steel material 1 and applying a coating layer with a thickness of l mm or more comprising a solventless polyurethane resin to the treated steel material, the glass transition temp. of a two-pack reaction type urethane primer used in the pretreatment is set to 40 deg.C or higher and the final arrival hardness (pencil hardness) of the coating film at 25 deg.C is set to B or more. |
