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Precoat metal plate and its manufacturing method

A manufacturing method and technology for metal plates, which can be applied to metal layered products, chemical instruments and methods, metal material coating processes, etc. The effect of corrosion resistance

Inactive Publication Date: 2008-02-13
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are problems such as that the process becomes complicated, the productivity decreases, and the cost becomes very high.

Method used

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  • Precoat metal plate and its manufacturing method
  • Precoat metal plate and its manufacturing method
  • Precoat metal plate and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0045] Pre-coated metal plate

[0046] First, the structure of the pre-coated metal plate according to the first embodiment of the present invention will be described.

[0047] The pre-coated metal plate 1a according to the first embodiment of the present invention includes a metal plate 2a having a base material as shown in FIG. 1A; the surface formed on the metal plate 2a, and is controlled into the outermost surface of the film and the inside of the film. The proportion of fluorine concentrations becomes a resin film 3a of the predetermined value. Here, the surface of the metal plate 2a refers to at least one of the surfaces of the metal plate 2a, preferably two sides. Next, the structures of the pre-coated metal plate 1a will be described.

[0048] (1) Metal plate

[0049] The metal plate 2a used in the first embodiment is not particularly limited, except for the most common cold rolled steel sheet, molten galvanized steel plate, electrozoal steel plate, alloying molten galvan...

Embodiment 1～5

[0079] In Examples 1 to 5, the pre-coated metal plate 1a was produced according to the above-mentioned production method. Each structure of the pre-coated metal plate 1a is as follows.

[0080] (Metal plate)

[0081] An aluminum alloy plate with a thickness of 0.5 mm and based on JIS 5052-H34 is used.

[0082] (Corrosion resistance film)

[0083] Phosphoric chromic acid film is formed on both sides of the aluminum alloy plate, and the adhesion amount of the phosphoric chromic acid film is 20mg / m in terms of Cr conversion. 2 .

[0084] (Fluorine resin film)

[0085] Coat the outermost surface of the phosphoric chromic acid film with a fluorine-based paint, and bake it at the baking temperature (peak temperature of the metal plate 2a) 200, 220, 250, 260, and 280°C to produce a fluorine film with a thickness of 5μm. System resin film. Here, as the fluorine-based paint, a fluorine-based paint in which the following two liquids are mixed is used.

[0086] (Main agent): Fluorine resin w...

Embodiment 6～13

[0107] Next, examples related to the weight average molecular weight and appearance of the fluorine-based resin used as the main agent will be described. As Examples 6-13, the pre-coated metal plate 1a was produced according to the manufacturing method described above. Each structure of the pre-coated metal plate 1a is as follows.

[0108] (Metal plate)

[0109] An aluminum alloy plate with a thickness of 0.5 mm and JIS 5052-H34 standard is used.

[0110] (Corrosion resistance film)

[0111] Phosphoric chromic acid film is formed on both sides of the aluminum alloy plate. The adhesion amount of the phosphoric chromic acid film is 20mg / m in terms of Cr 2 .

[0112] (Resin film)

[0113] A fluorine-based paint was applied to the outermost surface of the phosphoric chromic acid film, and baked at a baking temperature (peak temperature of the metal plate 2a) of 250°C to form a fluorine-based resin film 3a with a film thickness of 5 μm. Here, as the fluorine-based paint, a mixed fluori...

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Abstract

A precoated metal sheet which comprises a metal sheet and, formed on a surface thereof, a resin coating film comprising a fluororesin, wherein the concentration proportion of fluorine in an uppermost layer of the resin coating film, as calculated using the equation (1), is 20% or higher and the concentration proportion of fluorine in an inner layer located in a position about 1 / 2 the thickness of the coating film, as calculated using the following equation (1), is 15% or lower. A(%) = {F / (F+C+O+N100 (1) (In the equation (1), A is the concentration proportion of fluorine; F is the amount of fluorine in mass%; C is the amount of carbon in mass%; O is the amount of oxygen in mass%; and N is the amount of nitrogen in mass%.

Description

Technical field [0001] The present invention relates to pre-coated metal plates used for exterior panels or structural members of home appliances, automotive parts for automobiles, etc., and further used for various applications such as building materials and roofing materials, and a method of manufacturing the same. Background technique [0002] Thin metal plates represented by steel plates, aluminum plates or aluminum alloy plates have excellent strength and workability. Through various processing, they can be applied to various applications such as household appliances, automotive parts for automobiles, and building materials. The processed products of metal plates used in these applications are subjected to surface treatment for the purpose of improving appearance and corrosion resistance. This surface treatment has traditionally been the mainstream method of processing a metal plate into a predetermined shape and then performing post coating. Recently, it has been aimed at i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/082B05D3/02B05D7/14B05D7/24C09D201/04C23C28/00
CPCB05D2202/00C23C28/00G11B7/24094B05D7/52B05D5/083
Inventor 服部伸郎
Owner KOBE STEEL LTD
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