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A technology of hot-dip galvanizing and products, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of excessive zinc consumption and low efficiency utilization of heating system, reduce zinc consumption and stabilize heat. Loss, accelerate the effect of precipitation
Active Publication Date: 2008-10-08
SHANGHAI YONGFENG HOT DIP GALVANIZING
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a hot-dip galvanizing method for iron and steel products that is a
Method used
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Embodiment 1
[0025] Zinc pot volume: 16.2×2.5×3.6m 3 , heating method: electric heating on both sides
[0026] Steel products: 80kg / piece
[0027] 1) Cleaning of black parts: degrease steel products and remove pollutants;
[0028] 2) pickling: immerse the cleaned iron and steel products into the pickling tank, the pickling solution is hydrochloric acid aqueous solution, the working concentration is 10%, the working temperature is room temperature, and the weight ratio of ferric chloride in the pickling solution is controlled to be 150 grams per liter , pickled for 35 minutes, rinsed into ready-made products;
[0029] 3) Helper treatment: the helper solution is an aqueous solution of ammonium chloride and zinc chloride, and its mass ratio is
[0030] Ammonium Chloride 15%
[0031] Zinc Chloride 11%
[0032] Aqueous solution 74%
[0033] The working temperature is 65°C, the ph value is 5, and the content of ferric chloride in the plating flux is controlled at 2.5 grams per liter.
[0...
Embodiment 2
[0038] Zinc pot volume: 16.2×2.5×3.6m 3 , heating method: gas heating on both sides
[0039] Steel products: 400kg / piece
[0040] 1) Cleaning of black parts: degrease steel products and remove pollutants;
[0041] 2) pickling: immerse the cleaned iron and steel products into the pickling tank, the pickling solution is hydrochloric acid aqueous solution, the working concentration is 12%, the working temperature is room temperature, and the weight ratio of ferric chloride in the pickling solution is controlled to be 180 grams per liter , pickled for 50 minutes, rinsed into ready-made products;
[0042] 3) Helper treatment: the helper solution is an aqueous solution of ammonium chloride and zinc chloride, and its mass ratio is
[0043] Ammonium Chloride 18%
[0044] Zinc Chloride 13%
[0045] Aqueous solution 69%
[0046] The working temperature is 75°C, the pH value is 4.5, and the content of ferric chloride in the plating flux is controlled at 4 g / L.
[0047] Immerse the...
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Abstract
The invention relates to a hot dip galvanizing method for the iron and steel product, which belongs to the hot dip plating engineering in the metallurgy field. The invention mainly solves the technical problem that a hot dip galvanizing method for the iron and steel product utilized directly aiming at the faults in the normal hot dip galvanizing process that the excessive consumption of the zinc and the low efficiency utilization of the heating system is provided. The heating method of the dip galvanizing kettle of the invention is side surface heating, thus, the temperature of the liquid zinc can be conveniently controlled, the deposition of the zinc dross can be accelerated, and the zinc quantity taken away by the galvanizing piece can be reduced; because the ferric salt content inside the assistant galvanizing tank is controlled, the zinc dross quantity inside the zinc kettle is reduced; simultaneously, the output rate per hour is controlled to stabilize the heat loss and reduce the added zinc consumption caused by temperature variation. Through the progress of the process, the zinc consumption is reduced, the heat energy is fully utilized, the fault of the excessive zinc consumption caused by normal process and low efficiency utilization coefficient of the heating system are overcome, the quality is ensured, simultaneously, the resources are saved.
Description
technical field [0001] The invention relates to hot-dip galvanizing in the field of metallurgy, in particular to a hot-dip galvanizing method for iron and steel products. Background technique [0002] The anti-corrosion coating of steel products includes electroplating, hot-dip galvanizing and other methods. The hot-dip galvanizing process of steel products has been a conventional and commonly used method. The energy consumption in the process has also been paid attention to. Because the conventional process is too old, it has caused defects such as excessive consumption of zinc and low efficiency of the heating system. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a hot-dip galvanizing method for iron and steel products that is applied to defects such as excessive consumption of zinc and low utilization of heating systems caused by conventional hot-dip galvanizing processes. [0004] The technical solution pr...
Claims
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Application Information
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