To provide a surface treated metallic sheet excellent in abrasion resistance and press galling resistance, to obtain a water base organic composite coating material capable of obtaining the same surface treated metallic sheet and to provide its producing method.
The upper layer of a chromate coating plated metallic sheet is coated with a water base organic composite coating material composed of a water base resin, colloidal silica, water and at least one or more kinds of lubricants selected from the water base dispersions of fatty acid metallic salt, fatty acid bisamide, fatty acid amine and fatty acid amide derivatives, and in which the content of the colloidal silica is 5 to 35 wt.% expressed in terms of the solid content, and the content of the lubricants is 1 to 30 wt.% expressed in terms of the solid content by 0.3 to 5.0 g/m2 as dry weight, and after that, baking is performed to form a organic composite film. In this way, the surface treated metallic sheet excellent in abrasion resistance and press galling resistance can be obtained.
MORISHITA ATSUSHI
MIYAUCHI YUJIRO
TAKAHASHI AKIRA
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