SURFACE-TREATING COMPOSITION FOR COATED STEEL PANEL, SURFACE-TREATED PLATED SHEET STEEL AND MANUFACTURING METHOD THEREOF, AND COATED PLATED SHEET STEEL AND MANUFACTURING METHOD THEREOF

• Main Authors: INOKO TOMOHIRO, NOMURA HIROMASA, YAMAMOTO SHIGEKI, KUDO EISUKE, OIKAWA HIROYUKI
• Format: Patent
• Language: English; Japanese
• Published: 17.11.2014
• 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; 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 provide an aqueous surface-treating composition for a coated steel panel for forming a surface treatment layer for imparting excellent eaves-resistant corrosion resistance, while guaranteeing sufficiently processing adhesion even when not containing chromium.SOLUTION: In a surface-treating composition containing a specific organic silicon compound, a hexafluoro metal acid, an urethane resin having a specific cationic group, a vanadium compound and an aqueous medium, the cationic group in the urethane resin and a total amine value have specific values, to thereby obtain a surface treatment layer for imparting excellent eaves-resistant corrosion resistance, while guaranteeing sufficiently processing adhesion. 【課題】クロムを含まなくとも加工密着性を十分に担保しながら優れた耐軒下耐食性を付与する下地処理層を形成させる塗装鋼板用水系下地処理組成物の提供。【解決手段】特定の有機ケイ素化合物と、ヘキサフルオロ金属酸と、特定のカチオン性基を有するウレタン樹脂と、バナジウム化合物と、水性媒体を含有する下地処理組成物において、ウレタン樹脂のカチオン性基及び全アミン価が特定の値を有することで、加工密着性を十分に担保しながら優れた耐軒下耐食性を付与する下地処理層が得られる。【選択図】なし