Hot-dipping Zn-Al-Mg alloy coating layer steel plate and preparation method thereof
An alloy coating and hot-dip plating technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of difficult production, increased oxidation of the surface of the plating solution, and unfavorable production of zinc-aluminum-magnesium products, etc. To achieve the effect of good surface quality and excellent corrosion resistance
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[0030] The present invention also provides a method for preparing the above-mentioned hot-dip Zn-Al-Mg alloy coated steel sheet, which mainly includes the steps of degreasing cleaning, continuous annealing, hot-dip coating, air knife purging, cooling, smoothing, surface treatment, and coiling.
[0031] Among them, the degreasing cleaning mainly includes the steps of degreasing in the lye tank and the electrolytic tank, and then cleaning in the rinsing tank.
[0032] In order to effectively clean the grease and other residues on the surface of the strip steel and the lye residue on the surface of the strip steel during the rinsing process, while also saving production costs, the present invention can control the lye temperature of the lye tank at 60-90°C. The liquid concentration is controlled at 70-90 points, the electrolytic current of the electrolytic cell is controlled at 6000-8000A, the alkalinity of the rinsing tank is ≤8 points, and the drying temperature of the strip steel is...
Example Embodiment
[0047] Example 1
[0048] The hot-dip Zn-Al-Mg alloy coated steel sheet of this embodiment has a coating weight of 80g / m 2 (Double-sided), the main components of the coating are: aluminum 1.3%, magnesium 1.8%, lead 0.002%, antimony 0.002%, silicon 0.003%, tin 0.001%, and the rest is zinc.
[0049] The preparation method of the hot-dip Zn-Al-Mg alloy coated steel sheet of this embodiment is: in the degreasing cleaning process, the bath temperature needs to be controlled at 75°C, the concentration of the lye in the degreasing bath is 75 points, the electrolytic current is 7500A, and the bath is cleaned 6 points, the drying temperature of the strip steel is 125℃; in the continuous annealing process, the hydrogen in the furnace is 4.8%, and the zinc pot temperature is 400℃; in the hot-dip plating process, the bath temperature is 390℃, and the bath composition is aluminum 1.3 %, 1.8% magnesium, 0.012% of the total inevitable impurities, including 0.002% lead, 0.002% antimony, 0.003% sil...
Example Embodiment
[0051] Example 2
[0052] The hot-dip Zn-Al-Mg alloy coated steel sheet of this embodiment has a coating weight of 100g / m 2 (Double-sided), the main components of the coating are: aluminum 1.9%, magnesium 1.3%, lead 0.003%, antimony 0.002%, silicon 0.004%, tin 0.001%, and the rest is zinc.
[0053] The preparation method of the hot-dip Zn-Al-Mg alloy coated steel sheet of this embodiment is as follows: in the degreasing cleaning process, the bath temperature needs to be controlled at 65°C, the concentration of the lye in the degreasing bath is 70 points, the electrolytic current is 7000A, and the bath alkali 8 points, the drying temperature of the strip steel is 105℃; in the continuous annealing process, the hydrogen in the furnace is 3.9%, and the temperature of the zinc pot is 455℃; in the hot-dip plating process, the bath temperature is 450℃, and the bath composition is aluminum 1.9 %, 1.3% magnesium, 0.014% of the total unavoidable impurities, including lead 0.003%, antimony 0....
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