Chromate-free black coated metal plate
A chromate-free, metal plate technology, applied to metal layered products, devices for coating liquid on the surface, coatings, etc., can solve the problem of reduced appearance of the processing part, cannot meet the needs of chrome-free, and does not consider covering Resilience and other issues, to achieve the effect of excellent chemical resistance
Active Publication Date: 2012-05-09
NIPPON STEEL CORP
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- Description
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AI Technical Summary
Problems solved by technology
However, these colored steel sheets are designed to ensure corrosion resistance by providing a chromate coating, so they cannot meet the recent demand for chromium-free
In addition, since it is not a design that takes into account the hiding properties of the part where the colored layer extends after processing, there is also a problem that the appearance of the processed part is significantly reduced.
Method used
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Embodiment
[0096] Examples of the present invention will be described below. However, the present invention is not limited to these Examples.
[0097] (1) metal plate
[0098] The types of metal plates used are shown in Table 1. As the base material of the plated metal material, a mild steel plate with a plate thickness of 0.5 mm was used. Regarding the SUS plate, a ferritic stainless steel plate (steel composition: C: 0.008 mass%, Si: 0.07 mass%, Mn: 0.15 mass%, P: 0.011 mass%, S: 0.009 mass%, Al: 0.067 mass%, Cr: 17.3% by mass, Mo: 1.51% by mass, N: 0.0051% by mass, Ti: 0.22% by mass, the remainder being Fe and unavoidable impurities). The metal plate is used after degreasing the surface with alkali, washing with water and drying.
[0099] Table 1
[0100] No.
Metal plate (thickness 0.5mm, both sides are plated)
A1
Electro-galvanized steel sheet (coating weight 20g / m 2 )
A2
Hot-dip galvanized steel sheet (coating weight 60g / m 2 )
...
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Abstract
Disclosed is a low-cost chromate-free black coated metal plate, which does not contain hexavalent chromium that places a heavy burden on the environment, and has extremely excellent design properties (coloring properties and concealing properties including those in the processed portion), moisture resistance, corrosion resistance, processability, scratch resistance, chemical resistance and the like. Specifically disclosed is a chromate-free black coated metal plate which is characterized in that a black coating film (a) that contains a polyester resin (A1), which contains a sulfonic acid group and is cured with a curing agent (B), and carbon black (C) is formed on at least one surface of a metal plate in a thickness of 2-10 [mu]m.
Description
technical field [0001] The present invention relates to the formation of a hexavalent chromium-free black coating film (α) on at least one side of a metal plate with high environmental load, designability (including coloring and hiding properties of processed parts), moisture resistance, and corrosion resistance , processability, scratch resistance, chemical resistance and other extremely excellent low-cost chromate-free black painted metal sheet. Background technique [0002] In household appliances, building materials, automobiles, etc., precoated steel sheets coated with colored organic films are used instead of conventional post-coated products that are painted after forming. Since the precoated steel sheet is coated with a colored organic film on the antirust-treated steel sheet or the plated steel sheet, it has the characteristics of beautiful appearance, workability, and good corrosion resistance. [0003] For example, Patent Document 1 discloses a technique for obta...
Claims
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IPC IPC(8): B32B15/09B05D7/14B05D7/24C09D5/08C09D7/12C09D133/00C09D167/00C09D175/04C09D175/06C09D7/61C09D7/65
CPCC09D7/1266C09D7/1275C09D5/08B05D2601/02C09D7/125C08K3/04C08L2205/18C08L61/28C09D7/1216C09D167/00C09D175/04B05D5/06C08L23/06B05D3/108C09D7/1283B05D7/14C09D7/61C09D7/65C09D7/67C09D7/68C09D7/69Y10T428/259Y10T428/254Y10T428/265Y10T428/25C08L2666/02B32B15/09B05D7/24
Inventor 森下敦司林公隆布田雅裕
Owner NIPPON STEEL CORP