PURPOSE: To increase adhesive strength with a steel plate and a resin, and to improve the steel plate so as to resist even against press working by successively disposing an alloyed molten zinc plated layer having specific surface roughness and a coating type chromate treated layer on the internal surface of the steel plate on the side brought into contact with a viscoelastic resin layer.
CONSTITUTION: In a resin composite type vibration-damping steel plate, a viscoelastic resin layer is interposed between two steel plates. An alloyed molten zinc plated layer, in which the mean roughness Ra of a surface is kept within a range of 0.2-0.5μm, is arranged on the internal surface of the steel plate on the side brought into contact with the viscoelastic resin layer at that time. A coating type chromate treated layer is disposed on the top face of the plated layer. Conductive particles are contained in the viscoelastic resin layer. The chromate treated layers 2 are arranged on each one surface of two alloyed molten zinc plated steel plates 1 while the viscoelastic resin layer 3 with conductive fillers 4 is interposed between each treated layer 2. Accordingly, the adhesive strength of the steel plate and a resin is increased, thus improving the steel plate so as to resist even against press working while enhancing even the corrosion resistance of an end face.
MURASE MASAJI
TOKUNAGA KENJIRO
