Galvanized aluminum surface zinc dust causes and control
Release time:
Nov 25,2024
Source:
Zinc ash apparent phenomenon for the fine slag band on the surface of galvanized aluminum plate along the longitudinal direction to form a strip or point inclusions.
Zinc ash apparent phenomenon for the fine slag band on the surface of galvanized aluminum plate along the longitudinal direction to form a strip or point inclusions, is a minor defect, but the frequency of occurrence is higher than other slag defects.
The reason for its formation is: zinc ash is produced by the furnace nose at the zinc liquid surface of the floating slag and solid zinc slag condensed in the furnace nose cavity. These zinc slag falls on the strip surface, and with the strip through the zinc pot sinking rollers to produce a linear-based slight indentation, or fine slag band on the surface of the galvanized aluminum plate along the longitudinal direction of the formation of strips or point inclusions, resulting in zinc ash defects.
Its control measures are:
1, optimize the furnace nose nitrogen humidification system
Humidification system, you can raise the dew point temperature, so that the zinc vapor on the surface of the zinc liquid to form a layer of inhibition of the zinc liquid continues to evaporate the protective film. When the dew point temperature is not properly controlled, may be too much water vapor to produce defects, therefore, should be in practice to determine the optimal dew point temperature of the furnace nose.
2, furnace nose zinc slag cleaning
1) Make a special slag scoop to clean the slag in the furnace nose 2-3 times per shift.
2) Increase the zinc slag adsorption removal device in the furnace nose, through the fan will be outside the hot air blown into the closed furnace nose body.
3) Use the downtime, lower the zinc pot, expose the zinc liquid surface at the furnace nose, and then manually pick slag.
3, strip steel into the pot temperature control
1) Strictly control the temperature of the strip into the zinc pot, because the strip temperature exceeds the zinc liquid by more than 20℃, which will not only increase the temperature of the zinc pot, but also lead to an increase in the number of zinc slag.
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Galvanized aluminum surface zinc dust causes and control
Zinc ash apparent phenomenon for the fine slag band on the surface of galvanized aluminum plate along the longitudinal direction to form a strip or point inclusions.
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