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Black-plated steel sheet

A coated steel plate, black technology, applied in the direction of coating, layered products, hot-dip coating process, etc., can solve the problem of reducing the effect of blackening promotion, and achieve the effect of excellent design, excellent retention and excellent corrosion resistance

Active Publication Date: 2014-12-24
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this patent document 1, it is explained that if the content of the blackening-promoting element exceeds 1%, the oxidation of Zn is suppressed, so the blackening-promoting effect decreases on the contrary.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Using SPCC with a plate thickness of 1.2 mm as a base material, a Zn-coated steel plate containing molten Al and Mg with a plated layer thickness of 3 to 100 μm was produced. At this time, the composition of the coating bath (concentrations of Zn, Al, and Mg) was changed, and 20 types of coated steel sheets having different coating compositions and coating thicknesses were produced. Table 1 shows the composition of the coating bath and the thickness of the coating layer for the 20 types of coated steel sheets produced. In addition, the composition of the plating bath is the same as that of the plating layer.

[0111] Table 1

[0112]

[0113] For the coated steel sheets No. 1 to No. 16, the cross-section of the coating was observed with a scanning electron microscope, and phase identification was carried out by X-ray diffraction. As a result, Al / Zn / Zn can be seen in any coating structure. 2 The ternary eutectic structure of Mg. In addition, Al primary crystals wer...

Embodiment 2

[0141] Using SPCC with a plate thickness of 1.2 mm as a base material, a Zn-coated steel sheet containing molten Al and Mg with a plated layer thickness of 10 μm was produced. At this time, the composition of the coating bath (concentrations of Zn, Al, Mg, Si, Ti, and B) was changed, and 35 kinds of coated steel sheets having different coating compositions were produced. Table 3 shows the composition of the coating bath and the thickness of the coating layer for the 35 types of coated steel sheets produced. In addition, the composition of the plating bath is the same as that of the plating layer.

[0142] table 3

[0143]

[0144]

[0145] The prepared coated steel sheet was placed in a high temperature, high pressure and humidity heat treatment device, and the coating was brought into contact with water vapor under the conditions shown in Table 4.

[0146] For each of the coated steel sheets (Examples 24 to 58) after the water vapor treatment, the cross-section of the...

Embodiment 3

[0154] The coated steel sheet of No. 36 or No. 52 in Table 3 is coated with the inorganic chemical conversion treatment solution shown in Table 5, and is placed in an electric oven without washing with water, and is heated and dried at a temperature of 120° C. An inorganic coating is formed on the surface of the plated steel sheet.

[0155] table 5

[0156]

[0157]

[0158] The plated steel sheet on which the inorganic coating was formed was placed in a high-temperature, high-pressure wet heat treatment device, and the plated layer was brought into contact with water vapor under the conditions shown in Table 6 and Table 7.

[0159] For each of the coated steel sheets (Examples 59 to 90) after the water vapor treatment, the cross section of the coating was observed with an optical microscope. 2 The Mg phase was blackened. In addition, it was confirmed that the partially crystalline Zn 2 Mg phase and Al / Zn 2 Mg Binary Eutectic Zn 2 The Mg phase is also blackened.

...

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Abstract

A black-plated steel sheet has a Zn-plating layer containing molten Al and Mg, containing Al in the amount of 1.0-22.0 mass%, containing Mg in the amount of 1.3-10.0 mass%, and having a Zn black oxide distributed in a lamella pattern in the plating layer. The Zn black oxide is a Zn oxide derived from a Zn2Mg phase. The brightness of the surface of the Zn-plating layer containing the molten Al and Mg has an L* value of 60 or less.

Description

Background technique [0001] In fields such as building roofing materials and exterior packaging materials, home appliances, and automobiles, there is an increasing demand for steel sheets with a black appearance from the viewpoint of design and the like. As a method of blackening the surface of the steel sheet, there is a method of applying a black paint to the surface of the steel sheet to form a black coating film. However, in the above-mentioned fields, from the viewpoint of corrosion resistance, coated steel sheets coated with molten Zn coatings, Zn coatings containing molten Al, Zn coatings containing molten Al and Mg, etc. are often used. The surface has a silvery-white hue with a metallic sheen. Therefore, in order to obtain a highly designed black appearance by applying black paint, it is necessary to thicken the coating film to hide the base color, and the coating cost becomes high. In addition, if the coating film is thickened in this way, there is also a problem t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06B32B15/095C22C18/04C23C8/16C23C22/08C23C22/34C23C22/36C23C22/40C23C22/42C23C22/44C23C28/00
CPCC22C18/04C23C28/00C23C22/73C23C22/83Y10T428/12535Y10T428/12549Y10T428/12569Y10T428/12583Y10T428/1259Y10T428/12611Y10T428/12667C23C2/06C23C28/321C23C28/345C23C8/18C23C8/02C23C8/80C23C2/28C23C2/261C23C2/29B32B15/095C23C8/00C23C8/16B32B2250/03
Inventor 中野忠山本雅也武津博文
Owner NISSHIN STEEL CO LTD
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