A method for improving the sharpness of the surface of a 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 problem of the decrease of sharpness of image of steel plate, affecting the appearance and use of steel plate, and the surface of zinc-aluminum-magnesium coating Improve the holding capacity and improve the corrosion resistance of steel plates
Active Publication Date: 2022-07-15
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 Zn-Al-Mg sheet has good sharpness retention ability.
[0075] Microscopic analysis is carried out on the surface of the zinc-aluminum-magnesium plate of Example 1:
[0076] (1) Separate peaks according to oxygen element
[0077] Adopt XPS to study the distribution of elements near the surface layer after and before the method of Example 1, and the results are shown in Table 3 and Table 4 respectively;
[0078] Table 3 Full analysis of surface position 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 as follows: Figure 4 As shown, the differences in the types of surface compounds at the caustic-treated site versus the untreated normal site were investigated. According to the oxygen element, the peaks are divided...
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The invention discloses a method for improving the sharpness of the surface of a zinc-aluminum-magnesium plate, which comprises: heating a slab before rolling, hot rolling, pickling, cold rolling and annealing to obtain a heat-treated plate; Hot dip galvanizing, post-plating cooling and surface pre-oxidation treatment with alkali solution with pH ≥ 10, post-drying, surface treatment and coiling to obtain hot-dip galvanized aluminum-magnesium coated steel. The invention finds that in the continuous production of hot-dip galvanizing, the surface pre-oxidation treatment is carried out by using alkali solution with pH≥10, which can pre-oxidize the surface of the zinc-aluminum-magnesium coating to form surface zinc oxide (ZnO), alkaline zinc chloride (ZnO). 5 (0H) 8 Cl 2 ·H 2 O) and basic zinc-aluminum carbonate (Zn 6 A1 2 (OH) 16 CO 3 ·4H 2 The existence of these corrosion products can effectively block the electron transfer between the coating and external substances, improve the corrosion resistance of the coating, and at the same time can effectively improve the ability to maintain the sharpness of zinc, aluminum and magnesium.
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 the surface of a zinc-aluminum-magnesium plate. Background technique [0002] At present, domestic steel bases such as Jiugang, Tangshan Iron and Steel and Baosteel are all producing zinc-aluminum-magnesium-coated products. The zinc-aluminum-magnesium coated products are continuously increasing their market share due to their superior performance. However, in recent years, users of automotive sheets (oiled sheets) have gradually reported that the sharpness of the steel sheet on the surface of the zinc-aluminum-magnesium coating 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 reduction of sharpness ...
Claims
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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