METHOD FOR MANUFACTURING STEEL SHEET PROVIDED WITH ORGANIC COMPOSITE COATING FILM

• Main Authors: OKAMOTO KOTARO, ANDO SATOSHI, NABE SHIGEKI
• Format: Patent
• Language: English
• Published: 30.09.2004
• Edition: 7
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

PROBLEM TO BE SOLVED: To obtain a uniform surface appearance on the steel sheet provided with an organic composite coating film, when manufacturing it by forming an organic composite coating film comprising an underlayer formed through applying a liquid containing an oxide and phosphoric acid and/or a phosphate compound, and an upper layer formed of a resin coating film thereon. SOLUTION: The method for manufacturing the steel sheet provided with the organic composite coating film comprises applying a treatment liquid containing phosphoric acid and/or a phosphate compound on a galvanized steel sheet or an aluminized steel sheet lower than 50°C, then drying and heating it to form a coating film containing phosphoric acid with a thickness of 0.005 to 4 μm, and forming an organic coating film having a thickness of 0.1 to 5 μm thereon. COPYRIGHT: (C)2004,JPO&NCIPI