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Production method of hot dip galvanizing steel plate

A technology of hot-dip galvanized steel sheet and production method, which is applied in hot-dip plating process, coating, metal material coating process, etc., can solve the loss of adhesion of the intermediate layer, prevent the diffusion effect, and destroy the Fe-Al intermediate transition layer The problems of homogeneity and the decrease of Al percentage content can achieve the effects of low cost, optimized grain orientation of the coating, and improved wear resistance and adhesion performance.

Inactive Publication Date: 2008-12-17
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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AI Technical Summary

Problems solved by technology

If the solubility of Zn in the Fe-Al intermediate transition layer reaches supersaturation and a zinc-rich solid solution is formed, the absolute content of Al in the intermediate layer does not decrease at this time, but the percentage of Al decreases significantly, and at the same time because of the zinc Supersaturation destroys the homogeneity of the Fe-Al intermediate transition layer, thus causing the intermediate layer to lose its adhesion and prevent diffusion, and to form a thicker Fe-Zn alloy layer, so that the adhesion of the zinc layer is simultaneously go bad
[0005] In the prior art, the adhesion between the coating and the steel base is improved by changing the composition of the steel sheet or by controlling the surface roughness of the hot-dip galvanized steel sheet to form a coating on the surface, but no good effect has been achieved. The method of improving the adhesion between the coating and the steel base by using the composition and structure

Method used

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  • Production method of hot dip galvanizing steel plate
  • Production method of hot dip galvanizing steel plate
  • Production method of hot dip galvanizing steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Preparation of hot-dip galvanized steel sheet experimental examples 1-5 and comparative examples 6-15

[0025] The thickness is 0.8mm, the composition is C: 0.03~0.07%, Mn: 0.01~0.03%, Si: 0.19~0.30%, P: 0.006~0.019%, S: 0.009~0.020%, Al: 0.02~0.07%, The rest of the DX51D cold-rolled steel sheets containing Fe and unavoidable impurities are pickled and annealed, and then hot-dip galvanized under the various hot-dip galvanizing process conditions listed in Table 1. The initial temperature of the galvanizing bath in the zinc pot is 450°C. The Fe content in the coating bath is 2 , the surface of the zinc layer is treated with SiO 2 passivation treatment.

[0026] Table 1 hot-dip galvanizing process conditions

[0027]

Embodiment 2

[0028] Embodiment 2 Performance measurement of hot-dip galvanized steel sheet experimental examples 1-5 and comparative examples 6-15

[0029] (1) Coating Fe-Al intermediate transition layer and structure

[0030] Since the thickness of the Fe-Al intermediate transition layer is between tens and hundreds of nanometers, it is difficult to display this intermediate layer by conventional metallographic sample preparation methods. The metallographic sample preparation of the present invention adopts oblique mounting, and the mounting material is bakelite powder. On the hot mounting machine, 3 hot-dip galvanized steel samples are glued together with 502 strong glue, and placed side by side after grinding and polishing. On the slanted block with an inclination angle of 30° on the horizontal plane, the visible range of the entire section of the steel plate is approximately doubled, and the Fe-Al intermediate layer transition layer between each coating layer and the steel base interfa...

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Abstract

The invention pertains to the field of hot-dip galvanized steel sheet manufacturing; the technical problem to be solved is to provide a production method of a hot-dip galvanized steel sheet. The production method specifically comprises the steps that: the steel plate is pickled and annealed, and hot-dip galvanizing operation is carried out; during the operation, the temperature of starting to plate is 475 to 485 DEG C; the plating temperature in the zinc pot is 450 to 460 DEG C; Fe content in plating bath is less than 0.03 percent; Al content in plating bath is 0.16 to 0.18 percent; the speed of machine unit is 100 to 110m / min; the cooling speed of the steel sheet is 0 percent; depth to span temperature is 235 to 245 DEG C. By adopting the technical conditions, the ratio Al / Zn of atomic concentration of Al and Zn in Fe-Al intermediate layer is larger than 0.9; and the circumstances that Gamma phase and Delta phase are relatively thin and Xi phase is small can not be formed in a plating layer, and the most part of the plating layer is made up of Eta phase, and the crystal grain Zn (002) with optimized orientation is formed, thus causing the performance of attachment, scratch resistance, wear resistance to be greatly improved.

Description

technical field [0001] The invention belongs to the field of hot-dip galvanized steel sheet production, and in particular relates to a production method of a hot-dip galvanized steel sheet with good coating adhesion. Background technique [0002] Due to its good corrosion resistance, excellent coating performance and clean appearance, hot-dip galvanized steel sheets have been widely used in manufacturing industries such as household appliances and automobile body panels. The requirements for the hot-dip galvanized steel coating are strong adhesion between the coating and the substrate, and it will not fall off when stamping and deformation. In addition, it must have good welding performance, corrosion resistance and phosphating performance to ensure the adhesion of the paint film and after painting. corrosion resistance. However, there are problems such as powdering and peeling of the coating during the stamping process of the hot-dip galvanized steel sheet, which causes da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/40C23C2/06C22C38/06
Inventor 李炜徐权郭太雄程兴德田冰郑之旺杨学高于丹周一林
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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