Electro-galvanized steel sheet having excellent heat-resistant and tape adhesive, steel sheet using the same, and manufacturing method of the same

摘要

The present invention provides a coating composition for an electrogalvanized steel sheet having excellent heat resistance, corrosion resistance and chemical resistance as well as excellent adhesion to a tape used for a chassis. Specifically, the present invention provides a coating composition comprising: silane; silica sol; polyurethane resin, acrylic emulsion resin, or a mixture thereof; anti-corrosion additives; and water, wherein the silane includes a tetrafunctional silane and a trifunctional silane, and provides a coating composition for an electrogalvanized steel sheet, a surface-treated steel sheet using the same, and a method for manufacturing the same.