CHROMIUM-FREE METAL SURFACE TREATMENT METHOD, AND ALUMINUM OR ALUMINUM ALLOY SHEET

• Main Authors: KAMIMURA MASAYUKI, INOUE MINORU, SUGATA TOMOYUKI, NISHIMURA TOMOSHI
• Format: Patent
• Language: English
• Published: 06.11.2003
• Edition: 7
• 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; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PROBLEM TO BE SOLVED: To provide an inexpensive chromium-free metal surface treatment method which imparts adequate adhesiveness to a laminated metallic material, by using a chromium-free metal surface treatment agent superior in stability. SOLUTION: The chromium-free metal surface treatment method comprises a step of treating an article to be treated with a chromium-free meta surface treatment agent comprising a water-soluble zirconium compound and/or a water- soluble titanium compound, and an organic phosphonate compound, and a step of treating the treated article with an aqueous tannic solution, wherein the organic phosphonate compound has a phosphorus atom constituting a phosphonic group and bonding to a carbon atom, the content of the zirconium and/or the titanium is 20-800 ppm, the content of the organic phosphonate compound is 10-500 ppm, the tannin concentration is 300-8,000 ppm, and the solution of the chromium-free metal surface treatment agent has a pH of 1.6-4.0; and is used for manufacturing a thermoplastic polyester resin-coated metal sheet. COPYRIGHT: (C)2004,JPO