SURFACE-TREATED PLATED STEEL SHEET AND SURFACE TREATMENT SOLUTION

• Main Authors: SAWAI KAZUYOSHI, ASHITACHI HAJIME, TATSUMI KIYOMASA, OTA MAMORU, ANDO GIICHI, TOMIYASU TAKESHI, KITAYAMA HIROAKI, KIMURA YOSHIHISA, MAEDA EIJI, ICHIMARU HIROYUKI, OSHIMA YASUHIRO, NAKAGISHI TETSUYUKI, KIYA TOSHIO
• Format: Patent
• Language: English
• Published: 17.02.2011
• 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 a surface-treated plated steel sheet which has a harmless corrosion-proof coating film alternative to a chromate film and excellent in corrosion resistance and resistance to whitening caused by dew-condensation and is capable of being press molded even without coating an oil. SOLUTION: The surface-treated plated steel sheet has a film layer which includes a zirconyl cation component A, an anion component B selected from a phosphoric acid ion and a hydroxyethylidene diphosphonic acid ion, and a cationic component C selected from Mg and Ca, and includes a resin in an amount of 90 mass% or less. When the total electric charge (mmol×m-2) of each of components A, B and C in the film layer is expressed as A, B, and C, the film layer satisfies expression 1 of 0.49≤A/B≤1.3 and expression 2 of -0.3≤(A+C-B)/B≤0.3. All of the ionic components in the film substantially consist of components A, B, and C. The film layer, which has a film adhesion amount in a range of 1 to 10 mmol×m-2in term of the total charge amount of the anion component B, is formed on at least one side of a zinc-plated steel sheet. COPYRIGHT: (C)2011,JPO&INPIT