Composite coated metal sheet, treatment agent and method of manufacturing composite coated metal sheet
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsHiromasa Shoji, Hiroshi Kajiro
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Abstract
A composite coated metal sheet comprising a coated film having a low environmental impact prepared free from hexavalent chromium, and having good corrosion resistance equivalent to that provided by chromate treatment and excellent adhesiveness between the coated film and a resin layer formed on the coated film. Also, a treatment agent and a method of manufacturing the composite coated metal sheet with the treatment agent is described. The composite coated metal sheet comprises a coated film formed on a surface of a plated metal sheet or metal sheet, the coated film contains an oxide and/or a hydroxide of metal other than chromium, and an organic component comprising modified and/or unmodified functional group(s).
Claims21
A composite coated metal sheet comprising;
- a coated film on a surface of a plated metal sheet or metal sheet, and
- an organic resin layer or layers on the coated film,
- wherein the coated film contains
- an oxide and/or a hydroxide of metal other than chromium and,
- an organic component comprising modified and/or unmodified functional group(s), wherein the coated film is formed by applying cathode electrolyzation, and
- wherein the oxide and/or the hydroxide of the metal has a chemical bond with the organic resin layer or layers via the functional group(s).
A treatment agent for preparing a composite coated metal sheet comprising:
- an aqueous solution comprising;
- a first aqueous solution comprising a metal ion other than chromium ion and a fluorine ion in a molar ratio of the fluorine ion to the metal ion of six or more, and/or
- a second aqueous solution comprising a complex ion containing a metal ion other than chromium ion and a fluorine ion in a molar ratio of the fluorine ion to the metal ion of six or more times,
- wherein the aqueous solution further comprises an organic component containing modified and/or unmodified functional group(s) in a concentration of less than 20% by mass, and
- wherein the organic component contains at least one selected from the group consisting of polyacrylic acid, 2-ethylhexyl acrylate, and 2,3-epoxypropyl methacrylate.
A method of manufacturing a composite coated metal sheet comprising steps of:
- contacting a metal sheet or a plated metal sheet with a treatment agent to form a coated film on the metal sheet or the plated metal sheet, Wherein the coated film contains an oxide and/or a hydroxide of metal other than chromium and an organic component containing a modified and/or unmodified functional group;
- and
- forming an organic resin layer on the coated film formed on the surface of the metal sheet or the plated sheet, the oxide and/or the hydroxide of the metal having a chemical bond with the organic resin layer via the functional group,
- wherein the treatment agent comprises an aqueous solution comprising:
- a first aqueous solution comprising a metal ion other than chromium ion and a fluorine ion in a molar ratio of the fluorine ion to the metal ion of six or more;
- and/or
- a second aqueous solution comprising a complex ion containing a metal ion other than chromium ion and a fluorine ion in a molar ratio of the fluorine ion to the metal ion of six or more times, and
- the aqueous solution further comprising an organic component containing modified and/or unmodified functional group(s) in a concentration of less than 20% by mass.
A method of manufacturing a composite coated metal sheet comprising steps of:
- dipping a metal sheet or a plated metal sheet in a treatment agent;
- applying electrolyzation to the metal sheet or the plated metal sheet to form a coated film on the metal sheet or the plated metal sheet, the coated film comprising an oxide and/or a hydroxide of metal other than chromium and an organic component containing a modified and/or unmodified functional group;
- and
- forming an organic resin layer on the coated film formed on the surface of the metal sheet or the plated sheet, the oxide and/or the hydroxide of the metal having a chemical bond with the organic resin layer via the functional group,
- wherein the treatment agent comprises an aqueous solution comprising:
- a first aqueous solution comprising a metal ion other than chromium ion and a fluorine ion in a molar ratio of the fluorine ion to the metal ion of six or more;
- and/or
- a second aqueous solution comprising a complex ion containing a metal ion other than chromium ion and a fluorine ion in a molar ratio of the fluorine ion to the metal ion of six or more times, and
- the aqueous solution further comprising an organic component containing modified and/or unmodified functional group(s) in a concentration of less than 20% by mass.
Dependencies are inferred from the claim text.