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Zn-Al-Mg-Si alloy plated steel product having excellent corrosion resistance and method for preparing the same

A corrosion-resistant, zn-al-mg-si technology, used in metal material coating processes, hot-dip plating processes, and other household appliances

Inactive Publication Date: 2007-08-29
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Regarding other prior art, as the control of Mg in the coating phase 2 The example of Si phase content, can cite U.S. Patent No. 3026606, wherein disclosed technology is the Mg in the Al coating phase 2 The Si phase is controlled in the range of 4 to 25%, and the thickness of the alloy phase generated at the interface between the coating phase and the base metal becomes extremely small, but this technology does not utilize Mg 2 Si phase as a means to improve corrosion resistance

Method used

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  • Zn-Al-Mg-Si alloy plated steel product having excellent corrosion resistance and method for preparing the same
  • Zn-Al-Mg-Si alloy plated steel product having excellent corrosion resistance and method for preparing the same
  • Zn-Al-Mg-Si alloy plated steel product having excellent corrosion resistance and method for preparing the same

Examples

Experimental program
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Effect test

Embodiment 1 and comparative example 1

[0061] A cold-rolled steel sheet (thickness 0.8 mm) that has passed through a usual hot-rolling and cold-rolling process is used as a material to perform hot-dip Zn-Al-Mg-Si coating. A non-oxidizing furnace-reduction furnace type production line is used for plating. After plating, the gas wiping method is used to adjust the coating adhesion, and then it is cooled, and finally zero-spangle (Zero Spangle) treatment is applied. Specimens were produced by making various changes in the composition of the plating bath in order to study the characteristics of these specimens. It should be noted that the plating bath may contain unavoidable impurities brought about by the plating equipment or the cover plate in the plating bath, and as such impurities, about 1 to 2% of Fe is generally contained. The bath temperature was set at 600-650°C. The coating was peeled off from the obtained coated steel sheet, and the composition and adhesion amount of the coating were measured by chemical an...

Embodiment 2 and comparative example 2

[0105] A cold-rolled steel sheet having a thickness of 0.8 mm was used as a material, which was dipped in a Zn-Al-Mg-Si alloy plating bath having a bath temperature of 630° C. for 3 seconds to perform hot-dip plating. After plating, use the gas wiping method to adjust the coating adhesion to 90g / m 2 , and then cooled at a rate of 30°C / sec.

[0106] The coating composition of the obtained Zn-Al-Mg-Si based plated steel sheet was the composition shown in Table 2 and Table 3. Meanwhile, corrosion resistance was evaluated according to the following method. The results are also shown in Table 2 and Table 3. It should be noted that for the structure of these coatings, the results of observation after 5° oblique grinding show that at least in the case of Example 2 (sample Nos. 31 to 34), they are the same as the case of Example 1. Containing massive and flaky Mg as defined in the present invention 2 Si phase organization.

[0107] (1) Corrosion resistance corrosion evaluation

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Abstract

A Zn-Al-Mg-Si alloy-plated steel material with excellent corrosion resistance, characterized by comprising, in terms of wt%, Al: at least 45% and no greater than 70%, Mg: at least 3% and less than 10%, Si: at least 3% and less than 10%, with the remainder Zn and unavoidable impurities, wherein the Al / Zn ratio is 0.89-2.75 and the plating layer contains a bulky Mg2Si phase; also, a Zn-Al-Mg-Si alloy-plated steel material with excellent corrosion resistance, characterized by comprising, in terms of wt%, Al: at least 45% and no greater than 70%, Mg: at least 1% and less than 5%, Si: at least 0.5% and less than 3%, with the remainder Zn and unavoidable impurities, wherein the Al / Zn ratio is 0.89-2.75 and the plating layer contains a scaly Mg2Si phase.

Description

technical field [0001] The present invention relates to a Zn-Al-Mg-Si alloy plated steel material excellent in corrosion resistance and a method for producing the same. Background technique [0002] It is conventionally known to improve the corrosion resistance of steel by plating Zn on its surface, and even now, galvanized materials are still produced in large quantities. In addition, Zn—Al alloy plating has been proposed as a means for further improving corrosion resistance. Regarding the plating of such a Zn-Al alloy, it is proposed as Japanese Patent Document No. 617971. Its content is to plate a layer of alloy composed of 25-75% Al, Si equivalent to 0.5% or more of Al content and the rest basically composed of Zn, so that a coating with excellent corrosion resistance can be obtained at the same time. It is a Zn-Al alloy with good adhesion to the steel plate and a beautiful appearance. Such a Zn—Al alloy coating exhibits particularly excellent corrosion resistance com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/12C23C2/06C22C18/04C23C2/02C23C2/40
CPCC23C2/28Y10S428/939C23C2/12C23C2/26C23C2/06Y10T428/12722Y10T428/12931Y10T428/12757Y10T428/12924Y10T428/12799C23C2/29
Inventor 黑崎将夫森本康秀真木纯西村一实后藤治
Owner NIPPON STEEL CORP
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