STEEL SHEET FOR CONTAINER MATERIAL WITH LESS LOAD ON ENVIRONMENT AND ITS MANUFACTURING METHOD, AND LAMINATE STEEL SHEET FOR CONTAINER MATERIAL WITH LESS LOAD ON ENVIRONMENT AND PRE-COAT STEEL SHEET FOR CONTAINER MATERIAL USING THE SAME

• Main Authors: SENDA TOSHIO, KADOWAKI NOBUO
• Format: Patent
• Language: English
• Published: 05.03.2009
• Subjects: APPARATUS THEREFOR; 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 THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a steel sheet for a container material with less load on environment having excellent adhesiveness to a laminate film or an organic resin coating film such as paint equivalent to the conventional steel sheet for a container material subjected to chromate treatment and excellent iron-dissolution resistance after dent impact, and also to provide its manufacturing method for preventing fluoride or nitrate nitrogen compound from being discharged in a manufacturing step. SOLUTION: In the film laminate steel sheet for the container material or a coated steel sheet for a container material, a tin layer or an iron-tin alloy layer is formed on the steel sheet, and a chromium-free adhesive substrate-treatment layer consisting of tungsten compound which does not contain fluorine or nitrate nitrogen is formed thereon. The thickness of a tin oxide layer present on the tin layer or the iron-tin alloy layer on the steel sheet is ≤3.5 mc/cm2in the measurement by the electrolytic stripping method. COPYRIGHT: (C)2009,JPO&INPIT