Plated steel product, plated steel sheet and precoated steel sheet having excellent resistance to corrosion
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A corrosion-resistant, coated steel technology, applied in the direction of coating, transportation and packaging of superimposed layers, metal material coating process, etc.
Inactive Publication Date: 2002-03-27
NIPPON STEEL CORP
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Although the purpose of this invention is to form a coating structurally having the eutectic point of the ternary phase diagram and to obtain a steel sheet with excellent corrosion resistance, there is still room for improvement in the corrosion resistance of the end face portion or the processed portion of the steel sheet
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Embodiment 1
[0129] Prepare a cold-rolled steel sheet with a thickness of 0.8 mm, and use a Zn-Mg-Al-Si plating bath with different changes in the amount of Mg, Al, and Si. The surface is hot-dipped for 3 seconds, followed by N 2 Air purging to adjust the coating amount to 135g / m 2 . Table 1 shows the composition in the coating layer of the obtained plated steel sheet. In addition, the pre-plating layer of Ni was formed as a base layer in some of the samples.
[0130] Cut the plated steel sheet made by the above method into a sample of 150×70mm size, bend the obtained steel sheet sample to 180 degrees, and then spray it with 5% salt water at 35°C for 2000 hours. Then investigate the area rate of its rust.
[0131] (rating) (rust area ratio)
[0132] 5: Less than 5%
[0133] 4: More than 5%, less than 10%
[0134] 3: More than 10%, less than 20%
[0135] 2: More than 20%, less than 30%
[0136] 1: 30% or more
[0137] As can be seen from the evaluation results in Table 1, each mat...
Embodiment 2
[0140] Prepare a cold-rolled steel sheet with a thickness of 0.8 mm, and use a Zn-Mg-Al-Si plating bath with different changes in the amount of Mg, Al, and Si. The surface is hot-dipped for 3 seconds, followed by N 2 Air purging to adjust the coating amount to 135g / m 2 . Table 2 shows the composition in the coating layer of the obtained plated steel sheet. In addition, the pre-plating layer of Ni was formed as a base layer in some of the samples.
[0141] The obtained Zn-Mg-Al-Si-plated steel sheet was then immersed in a coating-type chromate treatment liquid to perform chromate treatment. The coating amount of chromate coating is 50mg / m in Cr conversion 2 . Then, an epoxy-polyester coating was applied thereon as an undercoat layer with a bar coater, followed by baking in a hot-air drying oven to adjust its film thickness to 5 μm. The polyester coating was then coated with a bar coater, baked in a hot-air drying oven to adjust the film thickness to 20 μm, and the coating...
Embodiment 3
[0152] Prepare a cold-rolled steel sheet with a thickness of 0.8 mm, place it in a Zn-Mg-Al-Si plating bath at 400 °C for 3 seconds of hot dip plating, and then use N 2 Air purging to adjust the coating amount to 135g / m 2 . Further, a Ni pre-plating layer is formed as a bottom layer. The composition in the coating layer of the obtained plated steel sheet was: Mg: 3%, Al: 5%, Si: 0.15%.
[0153] The obtained Zn-Mg-Al-Si plated steel sheet was then immersed in a coating-type chromate treatment solution for chromate treatment. The coating amount of the chromate coating is 50 mg / m in terms of Cr 2 .
[0154] During painting, epoxy-polyester paint, polyester paint, melamine-polyester paint, polyurethane-polyester paint, and acrylic paint were separately applied with a bar coater, and then baked in a hot-air drying oven to The film thickness was adjusted to the values shown in Tables 3 and 4.
[0155] As a comparative example, the same coating was performed on a hot-dip galv...
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Abstract
Provided are a Zn coated steel material, a Zn coated steel sheet and a painted steel sheet excellent in corrosion resistance, and a method of producing the same. Specifically, there is provided coated steel material excellent in corrosion resistance and a method of producing the same, which coated steel material is characterized in that it has, on the surface of steel sheet, a Zn-alloy coating layer containing 1 - 10 wt% of Mg, 2 - 19 wt% of Al and 0.01 - 2 wt% of Si, where Mg and Al satisfy Mg(%) + Al(%) ≤ 20%, the balance being composed of Zn and unavoidable impurities, and has a coating layer structure of a Mg intermetallic compound or the like. As a base metal treatment, it is preferably provided with a Ni coating layer. Also provided are a coated Zn coated steel sheet provided on the coating layer with, as an intermediate layer, a chromate film layer, and further with, as an upper layer, an organic coating layer, and a Zn coated steel sheet excellent in corrosion resistance provided on the coating layer with, as an upper layer, a chromate film, formed by coating with a resin chromate bath and drying, at 10 - 300 mg / m<2> as metallic chromium. The Zn-alloy coating layer according to the present invention may further contain one or more of 0.01 - 1 wt% of In, 0.01 - 1 wt% of Bi and 1 - 10 wt% of Sn. Further provided is a painted steel sheet having on the Zn-alloy coating layer a base metal treatment film layer containing 100 parts by weight of resin as solid content and 0.2 - 50 parts by weight of tannin or tannic acid and on the base metal treatment film layer, as an upper layer, an organic coating layer. Preferably the Zn-alloy coating layer further contains 0.01 - 2 wt% of Si, the base metal treatment film layer further contains 10 - 500 parts by weight of fine-grain silica as solid content, the organic coating layer is composed of an undercoating containing an anti-rust pigment and a colored overcoating, and a Ni coating layer is present under the zn-alloy coating layer. Further provided is a painted steel sheet having a base metal treatment film layer containing 100 parts by weight of resin as solid content and 0.1 - 3,000 parts by weight of a silane coupling agent and on the base metal treatment film layer, as an upper layer, an organic coating layer. The Zn-alloy coating layer can contain 0.01 - 2 wt% of Si and the base metal treatment film layer can further contain, as solid content, one or both of 1 - 200 parts by weight of fine-grain silica and 0.1 - 1,000 parts by weight of an etching fluoride. Moreover, a structure is present wherein intermetallic compound phase of 1 mu m or greater major diameter is dispersed in the Zn-alloy coating layer at a content of 0.1 - 50 vol%.
Description
technical field [0001] The present invention relates to plated steel, plated steel and painted steel, and more particularly, to plated steel, plated steel and painted steel having excellent corrosion resistance and suitable for various uses such as home appliances and building materials In addition, the present invention also relates to a steel sheet having excellent corrosion resistance of a processed part and containing no chromium which imposes a heavy load on the environment, and is therefore advantageous to the earth's ecology and is suitable as a coated steel sheet for building materials or home appliances. Background technique [0002] The most suitable steel to be used as a plated steel with excellent corrosion resistance is a galvanized steel sheet. This galvanized steel sheet is suitable for use in various manufacturing industries such as automobiles, home appliances, and building materials. Especially in the field of building materials, in th...
Claims
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Application Information
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