COMPOSITE OF STEEL PRODUCT AND RESIN AND PROCESS FOR PRODUCING THE COMPOSITE

摘要

Disclosed is a composite comprising an aluminum-plated steel plate material and a resin strongly bonded integrally with the aluminum-plated steel plate material. Also disclosed is a steel plate material having corrosion resistance. Three-dimensional protrusions having a stone-like shape with a surface diameter of not less than about 0.3 μm or having an irregular shape with a short axis of not less than 0.3 μm and a major axis of several micrometers or more formed by chemical etching of the aluminum-plated steel plate material are scattered on a plain part. On the plain part, in such a state that shallow concaves having a diameter of 20 to 50 nm are distributed adjacent to each other, 30 to 50% of the area of the plain part is accounted for by the shallow concaves. The surface of the three-dimensional protrusions is mainly formed of a ceramic containing silicon. The plain part is mainly formed of a ceramic containing aluminum. A steel product is heated, and a resin molded product is pressure bonded and fused to the steel product followed by injection bonding or by bonding to other adherend with a resin-type adhesive. Further, coating may be performed for corrosion resistance imparting purposes.