LUBRICATED STEEL SHEET EXCELLENT IN APPEARANCE, CORROSION RESISTANCE AND WORKABILITY

• Main Authors: KATSUMI TOSHIYUKI, MIYAUCHI YUJIRO
• Format: Patent
• Language: English
• Published: 21.11.1995
• Edition: 6
• Subjects: APPARATUS THEREFOR; 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; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; 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; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SPRAYING OR ATOMISING IN GENERAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

PURPOSE:To especially improve the appearance and corrosion resistance to obtain a lubricated steel sheet excellent in appearance, corrosion resistance and workability. CONSTITUTION:A chromate film 3 contg. a chromic acid 0.1-0.8 ratio of Cr<3+>/ total Cr, a phosphorus compd. in 0.5-1.5 weight ratio to the chromic acid and colloidal silica having 1-100nm grain diameter in <=2 weight ratio to a chromate compd. is formed on the surface of a galvanized steel sheet as the base material at 10-40mg/m , expressed in terms of Cr. A lubricating film 4 contg. 50-85wt.% of an ether-ester urethane resin having a bisphenol skeleton, an ester skeleton and a carboxyl group plus epoxy resin, based on the total solid component, 3-30wt.% polyolefin wax and 10-40wt.% silica having 3-30nm grain diameter is formed thereon as the 2nd layer at 0.3-5g/m . A lubricated steel sheet with superior wide applicability is obtained in this way.