Method for improving distinctness of image of surface of zinc-aluminum-magnesium plate
A technology of sharpness of image and zinc-aluminum-magnesium, which is applied in the direction of coating, metal material coating process, hot-dip plating process, etc., can solve the problems of affecting the appearance and use of steel plates, unacceptable use by customers, and the decline of sharpness of steel plates.
Active Publication Date: 2021-09-07
SHOUGANG JINGTANG IRON & STEEL CO LTD
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Problems solved by technology
However, in recent years, users of automotive sheets (oil-coated sheets) have gradually reported that the sharpness of the zinc-aluminum-magnesium coating on the surface of the steel sheet has decreased, which seriously affects the appearance and use of the steel sheet. At the same time, customers cannot accept the use of high-end O5 sheet materials and color-coated substrates.
At present, there is no technology that can solve the decrease in the sharpness of image on the surface of the zinc-aluminum-magnesium coating
Method used
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Embodiment 1
[0074] The zinc-aluminum-magnesium plate of embodiment 1 is as figure 1 , indicating that the treated zinc-aluminum-magnesium board has a good ability to maintain distinct image.
[0075] Carry out microscopic analysis to the zinc-aluminum-magnesium plate surface of embodiment 1:
[0076] (1) Split peaks according to oxygen element
[0077] Adopt XPS to study the element distribution near the surface layer after the method of embodiment 1 is processed and before processing, the results are shown in table 3 and table 4 respectively;
[0078] Table 3 Full analysis of surface elements after treatment
[0079]
[0080]
[0081] Table 4 Full analysis of untreated normal position elements
[0082]
[0083] The data in Table 3 and Table 4 are processed by peak-splitting software such as Figure 4 As shown, the differences in the types of surface compounds between the alkali-washed site and the untreated normal site were studied. The peaks are divided according to the ox...
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The invention discloses a method for improving the distinctness of image of the surface of a zinc-aluminum-magnesium plate. The method for improving the distinctness of image of the surface of the zinc-aluminum-magnesium plate comprises the following steps: carrying out pre-rolling heating, hot rolling, acid pickling, cold rolling and annealing treatment on a plate blank to obtain a heat-treated plate; and carrying out hot dipping and post-plating cooling on the heat-treated plate, adopting alkali liquor with the pH greater than or equal to 10 for surface pre-oxidation treatment, and then carrying out drying, surface treatment and coiling to obtain the hot-dip-galvanized aluminum magnesium coating steel. According to the invention, the surface of a zinc-aluminum-magnesium coating can be pre-oxidized to form surface zinc oxide (ZnO), alkaline zinc chloride (Zn5(0H)8Cl2.H2O), alkaline zinc-aluminum carbonate (Zn6Al2O3(OH)16CO3.4H2O) and the like by adopting the alkali liquor with the pH greater than or equal to 10 to carry out surface pre-oxidation treatment in hop-dip-galvanizing continuous production, and the existence of the corrosion products can effectively cut off electron transmission between the coating and external substances, so that the corrosion resistance of the coating is improved, and meanwhile, the retaining capability of image of surface of zinc, aluminum and magnesium can be effectively improved.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of iron and steel metallurgy, and in particular to a method for improving the sharpness of image on the surface of a zinc-aluminum-magnesium plate. Background technique [0002] At present, domestic iron and steel bases such as Jiuquan Iron and Steel, Tangshan Iron and Steel, and Baosteel are all producing zinc-aluminum-magnesium-coated products. Due to their superior performance, zinc-aluminum-magnesium-coated products are continuously increasing their market share. However, in recent years, users of automotive sheets (oil-coated sheets) have gradually reported that the sharpness of the zinc-aluminum-magnesium coating on the surface of the steel sheet has decreased, seriously affecting the appearance and use of the steel sheet. At the same time, customers cannot accept the use of high-end O5 sheet materials and color-coated substrates. At present, there is no technology that can so...
Claims
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Login to View More IPC IPC(8): C23C2/02C23C2/06C23C2/26C23C2/40
CPCC23C2/02C23C2/06C23C2/26C23C2/40
Inventor 刘璇马幸江侯耿杰李润昌韩志刚郑艳坤鲁洋泽李振
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD