POLYOLEFIN-COATED STEEL HAVING EXCELLENT ADHESION DURABILITY IN DRY-WET REPEATING ENVIRONMENT

摘要

PROBLEM TO BE SOLVED: To provide a polyolefin-coated steel which exhibits excellent adhesion durability of coating and corrosion resistance in a dry-wet repeating environments where corrosive conditions are extremely severe such as the insides of soil, rivers and the oceans by optimizing the composition of the steel. SOLUTION: The polyolefin-coated steel is obtained by successively stacking: a steel 15 having a composition containing 2.0 to 20% Cr, or further one or more kinds of metals selected from 0.1 to 6.0% Mo, 0.01 to 0.2% W, 0.01 to 0.2% Ti and 0.01 to 0.05% N; a chemical conversion treatment layer 14; an epoxy based primer layer 13; an adhesive polyolefin layer 12; and a polyolefin layer 11. Coating insulation resistance is controlled to≥108Ω×m2. COPYRIGHT: (C)2004,JPO&NCIPI