A kind of continuous hot-dip galvanized aluminum-silicon alloy coated steel sheet/strip surface spangle control method
A technology of aluminum-silicon alloy and control method, which is applied in the direction of hot-dip plating process, metal material coating process, coating, etc., can solve the problems that zinc-aluminum-silicon alloy-coated steel sheets/spangles on the surface cannot be well controlled, Achieve the effect of good spangle uniformity, good reproducibility and repeatability
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Embodiment 1
[0024] Using the continuous hot-dip galvanizing aluminum-silicon alloy coated steel sheet / strip surface spangle control method of the present invention: the roughness of the substrate is 0.22um, the temperature of the degreasing and cleaning bath is 78°C, the free alkalinity of the alkali solution of the degreasing bath is 32Pt, and the free alkali of the cleaning bath is 32Pt. The temperature is 4Pt, the drying temperature of the strip is 120℃; the temperature of the strip entering the zinc pot is 460℃, the composition of the zinc pot is 8.5% Al, 0.25% Si, 0.09% Re, the rest is zinc and inevitable impurities, the temperature of the zinc pot is The air knife distance is 10mm, the air knife height is 230mm, the coating weight is 80g / m2, the zinc liquid solidification line is 5 meters above the zinc pot, and the difference between the maximum thickness and the minimum thickness of the upper and lower surface coatings is 5g / m2 and 3g / m2 respectively. m2; high-span cooling temperat...
Embodiment 2
[0027] Using the continuous hot-dip galvanizing aluminum-silicon alloy coated steel sheet / strip surface spangle control method of the present invention: the roughness of the substrate is 0.68um, the temperature of the degreasing and cleaning bath is 52°C, the free alkalinity of the degreasing bath is 78Pt, and the free alkali of the cleaning bath is 78Pt. The temperature of the strip is 7Pt, the drying temperature of the strip is 110℃; the temperature of the strip entering the zinc pot is 545℃; the composition of the zinc pot is 24.5% Al, 0.92% Si, 0.45% Re, and the rest are zinc and inevitable impurities; The temperature is 550℃; the air knife distance is 5mm, the air knife height is 400mm, the coating weight is 60g / m2, the zinc liquid solidification line is 3 meters above the zinc pot, and the difference between the maximum thickness and the minimum thickness of the upper and lower surface coatings is 2g / m2 and 2.5g respectively / m2, high-span cooling temperature 210℃.
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Embodiment 3
[0030] Using the continuous hot-dip galvanizing aluminum-silicon alloy coating steel plate / strip surface spangle control method of the present invention: the roughness of the substrate is 0.42um, the temperature of the degreasing and cleaning bath is 60°C, the free alkalinity of the alkali solution of the degreasing bath is 50Pt, and the free alkali of the cleaning bath is 50Pt. The temperature of the strip is 5Pt, the drying temperature of the strip is 100℃; the temperature of the strip entering the zinc pot is 510℃; the composition of the zinc pot is 15% Al, 0.52% Si, 0.35% Re, and the rest is zinc and inevitable impurities; the temperature of the zinc pot The temperature is 515℃; the air knife distance is 12mm, the air knife height is 150mm, the coating weight is 100g / m2, the zinc liquid solidification line is 6 meters above the zinc pot, and the difference between the maximum thickness and the minimum thickness of the upper and lower surface coatings is 4g / m2 and 7g / m2 respe...
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