ORGANIC-COMPOSITE-PLATED STEEL PLATE AND COATING RESIN COMPOSITION USED FOR PRODUCING THE SAME

摘要

An improved organic-composite-plated steel plate produced by coating a chromated alloy-plated steel plate with a thermosetting resin and curing the coated plate, wherein the thermosetting resin comprises various water-base resin composition containing as the basic film-forming component a water-base vinyl-modified epoxy ester resin, a system composed of a water-based vinyl-modified epoxy ester resin and a blocked isocyanate compound or a system composed of a water-base vinyl-modified epoxy ester resin, a blocked isocyanate compound and colloidal silica. The invention can provide a novel and extremely practicable organic-composite-plated steel plate which comprises a metallic material precoated with a water-base organic composite coating resin (composition) without using a large quantity of an organic solvent and which is excellent in adhesion with adhesives, continuous weldability, corrosion resistance after working, and capability of electrodeposition coating, in close adhesion of coating material and corrosion resistance, particularly in image sharpness (flatness) of a coated surface after electrodeposition coating, and further in the resistance to rusting of adventitious origin.