A method for controlling surface defects of zn-al-mg alloy coating plate and zn-al-mg alloy coating plate
A technology of alloy coating and plate, which is applied in the direction of metal material coating process, coating, hot-dip plating process, etc., can solve the problem of easily forming Fe-Al zinc dross, hindering the corrosion resistance of Mg, and difficult maintenance of plating bath and other problems, to achieve the effects of low temperature of zinc liquid, reduced quantity, and good prospects for popularization and application
Active Publication Date: 2020-07-28
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0004] The publication number is: CN101558182, and the publication date is October 14, 2009. The Chinese patent document titled "Hot-dip Zn-Al alloy steel sheet and its manufacturing method" discloses a hot-dip Zn-Al alloy steel sheet. However, The aluminum content of the coating is relatively high. While improving the corrosion resistance, it also has the following disadvantages: solid slag particles of Fe-Al zinc slag are easily formed in the plating bath, thus making it difficult to maintain the plating bath; in addition, the plating The fluidity of the zinc liquid in the liquid pool is reduced, which seriously affects the apparent quality of the coating and limits the application range of the product
In addition, because the high aluminum content in the coating is limited in terms of weldability, the application in the automotive industry is limited, and it is generally used in construction and light industrial appliances that require high corrosion resistance.
[0005] In addition, the publication number is CN101454473A, the publication date is: June 10, 2009, and the Chinese patent document titled: "Flat steel product with anti-corrosion coating and its preparation method" discloses a flat steel product, the steel The substrate has a zinc-based anti-corrosion coating with an aluminum content of less than 3%, but in order to control the oxidation of Mg, the Al / Mg is limited to Al / Mg greater than 1, so the Mg content is limited to 0.25 to 2.5%, It hinders the role of Mg in improving the corrosion resistance of the coating
[0006] In addition, in the prior art, there will be a surface defect on the surface of the product produced by hot-dip galvanizing, which is irregular in texture, has a relatively flat "concave" part and can be felt by fingers, and is obviously higher than the plating layer. The rough surface composed of "ridges" on the surface, if the defect cannot be effectively controlled, will have a great impact on product quality and seriously hinder the application of the product
The solution to this surface defect is not disclosed in the above-mentioned patent documents
Method used
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Embodiment 1-5 and comparative example 1-7
[0049] The Zn-Al-Mg alloy coated sheet material of embodiment 1-5 and the steel plate of comparative example 1-7 adopt following steps to make:
[0050] (1) Using cold-rolled strip steel as the substrate, the substrate is pretreated;
[0051] (2) adopt the composition ratio galvanizing pool of table 1, each substrate is immersed in each composition Zn-Al-Mg bath, adopt the process parameter listed in table 2, control the temperature of the galvanizing pool and the temperature of the galvanizing pool when the substrate enters the galvanizing pool Zinc dipping time;
[0052] (3) After the plate with the Zn-Al-Mg alloy coating on the surface leaves the plating solution pool, use an air knife to control the thickness of the coating, wherein the air knife medium adopts the process parameters listed in Table 2.
[0053] Table 1 lists the mass percentages of each chemical element in the galvanizing bath used in each embodiment and each comparative example.
[0054] Table 1. (wt%, t...
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The invention discloses a control method for Zn-Al-Mg alloy coating plate surface defects. The method includes the steps of: (1) pretreating a substrate; (2) immersing the substrate into a Zn-Al-Mg plating solution pool; (3) after removing the plate with a plated Zn-Al-Mg alloy coating on the surface from the plating solution pool, using an air knife to control the coating thickness. And in the step (3), the used air knife scraping medium is gas with an oxygen content volume percent of less than 5%. Correspondingly, the invention also discloses a Zn-Al-Mg alloy coating plate, which includes the substrate and the Zn-Al-Mg alloy coating plated on the substrate surface, and is prepared by the aforementioned method. The Zn-Al-Mg alloy coating plate obtained by the method provided by the invention has the advantages of simple process, high surface quality, difficult appearance of surface defects, and good corrosion resistance.
Description
technical field [0001] The invention relates to a board manufacturing method and the board, in particular to a method for improving the surface quality of the board and the board. Background technique [0002] Steel hot-dip galvanizing technology can effectively slow down the corrosion of steel and prolong its service life. Compared with other anti-corrosion methods, it has the advantages of low production cost, simple process, firm coating, and good appearance. In order to further improve the corrosion resistance of the coating, the galvanized material is also developed from pure zinc to zinc alloy. [0003] People have been developing and researching this galvanized material for a long time, and the main work is to mix other various additive elements, or limit the production process parameters to further improve its corrosion resistance or make it easy to manufacture and reduce production costs. [0004] The publication number is: CN101558182, and the publication date is ...
Claims
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IPC IPC(8): C23C2/06C23C2/40C23C2/20C22C18/04C22C18/00
CPCC22C18/00C22C18/04C23C2/06C23C2/20C23C2/40
Inventor 程国平金鑫焱刘启阳史良权钱洪卫任玉苓谢英秀
Owner BAOSHAN IRON & STEEL CO LTD