SUBSTRATE TREATING AGENT FOR PRECOATED METAL SHEET, COATED SUBSTRATE-TREATED METAL SHEET COATED WITH THE SAME, AND PRECOATED METAL SHEET PRODUCED BY USING THE COATED SUBSTRATE-TREATED METAL SHEET

• Main Authors: FUDA MASAHIRO, MORISHITA ATSUSHI, MIZUNO KENSUKE, HAYASHI KIMITAKA, UENO KEIICHI, FURUKAWA HIROYASU, TENMAYA MOTOHIRO
• Format: Patent
• Language: English
• Published: 20.09.2012
• Subjects: 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; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

PROBLEM TO BE SOLVED: To provide: a new substrate treating agent suitably used for various types of precoated metal sheets; a coated substrate-treated metal sheet processed by coating the substrate treating agent ; and a precoated metal sheet produced using the coated substrate-treated metal sheet.SOLUTION: The substrate treating agent for a precoated metal sheet includes, in water as solid contents, tannin or tannic acid, a silane coupling agent, and fine silica as well as a polyester resin including a sulfonic acid group or a sulfonate group as a substituent, and has a pH as a treating agent of 2.0-6.5. The substrate treating agent for a precoated metal sheet may include a phosphate compound in order to further improve the corrosion resistance of the precoated metal sheet.