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Hot-dipped galvanized steel sheet and method for producing same

A hot-dip galvanized steel sheet, hot-dip galvanized technology, applied in hot-dip galvanizing process, chemical instruments and methods, superimposed layer plating, etc. Poor and other problems, to achieve the effect of excellent blackening resistance and excellent red rust resistance

Active Publication Date: 2018-07-17
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that hot-dip galvanized steel sheets containing Mg are poor in blackening resistance, that is, when exposed to high-temperature and high-humidity environments for a long time, the surface of the coating layer becomes discolored and blackened, and the commercial value tends to be significantly reduced.

Method used

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  • Hot-dipped galvanized steel sheet and method for producing same
  • Hot-dipped galvanized steel sheet and method for producing same
  • Hot-dipped galvanized steel sheet and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0139] Next, an Example and a comparative example are given, and this invention is demonstrated more concretely.

[0140]

[0141] use Figure 1 to Figure 6 To illustrate the features of the present invention. A hot-dip galvanized steel sheet consisting of three types of coatings produced by a continuous hot-dip galvanizing line was used. As the composition of the coating layer, the following three types are used, and the coating weight is 250g / m. 2 (each side) of hot-dip galvanized steel. In addition, % represents mass %.

[0142] (1) Al: 0.2%, Mg: 0.5%, Ni: 0.1%, the balance of Zn and unavoidable impurities (expressed as Zn-0.2Al-0.5Mg-0.1Ni)

[0143] (2) Al: 0.2%, Mg: 0.5%, the balance of Zn and unavoidable impurities (expressed as Zn-0.2Al-0.5Mg)

[0144] (3) Al: 0.2%, the balance of Zn and unavoidable impurities (expressed as Zn-0.2Al)

[0145] The hot-dip galvanized steel sheet produced above was treated with an acidic aqueous solution containing Co ions. For th...

Embodiment 2

[0161] In Tables 1 to 5, numerical values ​​and items that deviate from the scope of the present invention are underlined.

Embodiment 1～31 and comparative example 1～7

[0163] Temper rolling was carried out on a steel sheet having a hot-dip galvanized layer with an adhesion amount of about 250 g / m per side 2 , The chemical composition is Mg: 0.5%, Al: 0.2%, Ni: 0.1%, the balance of Zn and the hot-dip galvanized layer of unavoidable impurities.

[0164] Then, the surface of the hot-dip galvanized layer was sprayed with a 40° C. Co ion-containing acidic aqueous solution for 1 to 3 seconds. Then, washing with water and drying were performed.

[0165] Table 1 shows the composition of the acidic aqueous solution containing Co ions. Both dissolved sulfate and the pH was adjusted with sulfuric acid.

[0166] Next, a chromate-free organic resin is applied and dried to form an organic resin film.

[0167] The organic resin film shown in Table 2 was used for the organic resin film. A water-based paint compounded so as to have a solid content concentration shown in Table 2 was applied by a bar coater, and baked at a temperature of 100° C. in a hot a...

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PUM

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Abstract

This hot-dipped galvanized steel sheet is provided with: a steel sheet; a hot dip galvanization layer which is provided on the surface of the steel sheet and contains 0.05-2.00% by mass of Mg, 0.1% bymass or more but less than 1.0% by mass of Al and 0.05-2.00% by mass of Ni, with the balance made up of Zn and impurities; a Co-Mg-Zn layer which is provided on the surface of the hot dip galvanization layer and contains Mg, Zn and 0.1-2.0 mg / m2 of Co precipitates in terms of Co metal; and an organic resin coating film which is provided on the upper part of the Co-Mg-Zn layer.

Description

technical field [0001] The invention relates to a hot-dip galvanized steel sheet and a manufacturing method thereof. [0002] This application claims priority based on Patent Application No. 2015-256743 for which it applied in Japan on December 28, 2015, The content is used in this application. Background technique [0003] Conventionally, chromate treatment has been widely used as an antirust treatment for galvanized steel sheets. However, hexavalent chromium is considered to be harmful to the human body. In particular, in recent years, from the viewpoint of environmental protection, the movement to limit hexavalent chromium has been accelerated, and various chromate-free antirust treatments have been developed and put into practical use. [0004] In addition, in order to improve the corrosion resistance of a hot-dip galvanized steel sheet, a hot-dip galvanized steel sheet containing Mg in the hot-dip galvanized layer is also put into practical use. It is known that a ho...

Claims

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Application Information

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IPC IPC(8): C23C28/00B32B15/18C23C2/06C23C22/53
CPCB32B15/18C23C2/06C23C22/53C23C28/00
Inventor 石冢清和山本刚大大和真征西村信明齐藤完新头英俊
Owner NIPPON STEEL CORP