Method for eliminating dark printing on surface of galvanized strip steel
A strip steel and zinc pot technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems affecting the surface quality of strip steel, affecting the yield of home appliance panels, etc., and achieve simple and practical operation methods, The effect of eliminating dark marks on the surface and huge economic benefits
Inactive Publication Date: 2015-04-22
鞍钢冷轧钢板(莆田)有限公司
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Problems solved by technology
[0002] On the surface of galvanized steel strip, iron powder and zinc powder are attached to the surface of the strip steel and bonded tightly with the steel plate. After cooling, the color will deepen, and dark marks will be formed on the surface of the strip steel. Bubbles will form on the dark marks after painting, affecting the surface quality of the strip steel. , affecting the yield of home appliance panels
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Experimental program
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Effect test
Embodiment
[0015] A method for eliminating dark marks on the surface of galvanized steel strip, the specific operations are as follows:
[0016] a. Thoroughly clean the oil and iron powder in the cleaning section every 25-30 days, optimize the process control of the cleaning section, and change the control method of conductivity (10-100ms / cm) to concentration control (0.7-1.2%), every day Send samples to test the cleaning solution concentration, test the iron powder content and oil content every week, discharge the cleaning solution regularly for 10-15 minutes in each shift, add the defoamer to the drop method, test the reflectivity of the strip surface every week, and require reflection Efficiency > 90%, to ensure the cleaning quality of the strip surface;
[0017] b. Adjust the dew point control of the furnace nose, adjust the dew point to -20°C to -25°C, reduce the dew point of the furnace area, increase the moisture content in the furnace nose, and make the zinc ash in the furnace no...
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The invention relates to a method for eliminating dark printing on the surface of galvanized strip steel. The method comprises the following specific steps: a, periodically and completely cleaning a cleaning section to prevent the pollution of iron powder and oil stain to the surface of the strip steel; b, adjusting the control on the dew point of a furnace nose, wherein the dew point is adjusted to -20 DEG C to -25 DEG C to avoid being adhered to the surface of the strip steel and simultaneously additionally arranging a zinc-pumping pump inside the furnace nose to ensure the purity of molten zinc; c, adjusting the components of a zinc pot, wherein the content of aluminum is controlled to be 0.19-0.22% and the 0.6% AI aluminum ingot is added in a unified manner and simultaneously additionally arranging a zinc pot dross purging device used for purging dross at downtime so that the dross in the zinc pot is reduced and the quality of galvanizing is further ensured; and d, periodically cleaning the wind pressure of an air knife, cooling wind path pipelines and a filter screen so as to ensure the cleanliness of wind and prevent the adhesion of foreign matters, such as dust, to the surface of the strip steel and avoid the formation of a dark printing defect. The operation method is simple and practical and dark printing on the surfaces of various specifications of strip steel are eliminated, the surface level reaches FB requirements and meets the needs of all appliances boards, the price of FB is increased per ton compared with FA and the method create huge economic benefits for enterprises.
Description
technical field [0001] The invention relates to a method for eliminating dark marks on the surface of galvanized strip steel. Background technique [0002] On the surface of galvanized steel strip, iron powder and zinc powder are attached to the surface of the strip steel and bonded tightly with the steel plate. After cooling, the color will deepen, and dark marks will be formed on the surface of the strip steel. Bubbles will form on the dark marks after painting, affecting the surface quality of the strip steel. , affecting the yield of home appliance panels. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for eliminating dark marks on the surface of galvanized steel strips, so as to eliminate dark marks on the surfaces of strips of various specifications. [0004] To achieve the above object, the present invention adopts the following technical solutions: [0005] A method for eliminating dark marks ...
Claims
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IPC IPC(8): C23C2/06C23C2/40
Inventor 刘灿红刘建煌袁洪波常仁贵
Owner 鞍钢冷轧钢板(莆田)有限公司