A method for controlling spangles on the steel plate surface using an aluminum-zinc-magnesium plating solution
A control method, aluminum-zinc-magnesium technology, applied in the direction of hot-dip plating process, coating, metal material coating process, etc., can solve the problems of affecting atomization, wasting paint, dripping water, etc.
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Embodiment 1
[0024] Degrease, scrub, rinse and dry the steel plate. The purpose is to remove residual grease and stains on the board surface.
[0025] After the steel plate is heated, cooled and kept warm to 500-600 ° C, it enters the zinc pot, the immersion time is 5s, and the volume ratio of the protective gas atmosphere in the furnace is H 2 / N 2 =1 / 4. The atomic percentages of the components contained in the plating solution are as follows: Al: 55%, Mg: 2%, Si: 6%, Ti: 1.2%, B: 2.5%, Ce: 0.6%, and the rest are Zn and unavoidable impurities. The bath temperature was 585°C.
[0026] Immediately after the steel plate leaves the bath, it is cooled by an air knife, and the thickness of the coating is controlled. The distance between the air knife and the steel strip is 18mm, and the air flow rate is 3800L / h. The temperature and other parameters make the cooling rate at 20°C / s, and then quickly cool the galvanized steel sheet to room temperature through the direct contact between the coo...
Embodiment 2-12
[0029] The coating composition in each embodiment is shown in Table 1, and the specific preparation method is the same as that of Example 1, only the composition of the plating solution is adjusted. See Table 2 for the size and uniformity of spangles on the surface of the galvanized layer.
[0030] In Examples 1-6, the components of the plating solution of the present application were used, and the spangles were observed by an optical microscope on the surface of the coating to be small and no abnormally large spangles appeared. In Example 7, no rare earth element was added, and a small amount of larger spangles appeared. Change Ti, B element content scope in embodiment 8-10, reduce both content respectively, then because nucleation quantity reduces, causes spangle overall quantity to reduce, and appears larger spangle, changes Si atom in embodiment 11-12 In the ratio range, reducing the Si element content will lead to larger spangles, and increasing the Si content will cause...
Embodiment 13
[0036]Degrease, scrub, rinse and dry the steel plate. The purpose is to remove residual grease and stains on the board surface.
[0037] After the steel plate is heated, cooled and kept warm to 500-600 ° C, it enters the zinc pot, the immersion time is 5s, and the volume ratio of the protective gas atmosphere in the furnace is H 2 / N 2 =1 / 4. The atomic percentages of the components contained in the plating solution are as follows: Al: 55%, Mg: 2%, Si: 6%, Ti: 1.2%, B: 2.5%, Ce: 0.6%, and the rest are Zn and unavoidable impurities. The bath temperature was 585°C. Immediately after the steel plate leaves the bath, the air knife is used to cool it, and the thickness of the coating is controlled. The distance between the air knife and the steel strip is 15mm-29mm, and the air flow is 3500-4000L / h. Parameters such as spacing, air flow, ventilation temperature and other parameters make the cooling rate at 15-40°C / s, and finally cool to room temperature. After observation by opti...
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Abstract
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