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Strip steel continuous zinc heat coating process

A process method, hot-dip galvanizing technology, which is applied in the direction of hot-dip galvanizing process, process efficiency improvement, metal material coating process, etc., can solve the problem that the strip steel surface grease and oxide scale cannot be removed, and achieve the elimination of combustion and explosion hazards , reduce tension and reduce cost

Inactive Publication Date: 2007-11-28
福建爱溥环保设备有限公司
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Problems solved by technology

[0003] In order to overcome the deficiency that the existing process of continuous hot-dip galvanizing of strip steel cannot remove the grease and scale on the surface of the strip steel, the present invention provides a process method of continuous hot-dip galvanizing of strip steel, which can remove Grease and scale on the surface of the steel strip, activate the surface of the steel, reduce the surface tension of the molten metal, improve the wetting ability of the zinc liquid, and increase the binding force of the zinc coating

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  • Strip steel continuous zinc heat coating process

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Embodiment Construction

[0028] A process method for strip steel continuous hot-dip galvanizing, as shown in Figure 1, it comprises:

[0029] The first cleaning step: for cleaning and removing residues on the surface of the strip;

[0030] Alkali cleaning step: for removing the grease on the strip surface, the solution used in this alkali cleaning step is 15% sodium hydroxide solution, the solution used in this embodiment is sodium hydroxide solution, but not using sodium hydroxide solution as Limit, can also use sodium hydroxide, sodium silicate, sodium phosphate, sodium carbonate mixture, etc.;

[0031] Pickling step: used to remove scale and reaction products on the surface of the steel strip. The solution used in this pickling step is a hydrochloric acid solution. The solution used in this embodiment is a hydrochloric acid solution, but it is not limited to the hydrochloric acid solution. Using sulfuric acid, etc.;

[0032] The second cleaning step: for cleaning and removing the products of alka...

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Abstract

A technology method about continuous hot dip galvanizing on zonal steel, the method contains: the first cleaning step to clean and get rid of the remainder on the surface of zonal steel; The alkaline cleaning step to get rid of the fat on the surface of it; The acidwashing step to get rid of the oxidation skin on the surface of it. The second cleaning step: To get rid of the product of the alkaline cleaning and acidwashing on the surface of zonal steel. Heat treatment step: to realize the heat treatment of the zonal steel in the shielding gas and deliver the zonal steel to the zincification step in the ambience of shielding gas. Heat zincification step: to install clad layer on the surface of zonal steel. The benefit of this patent is: the patent contains the first cleaning step, alkaline cleaning step, acidwashing step and the second cleaning step, it can get rid of oxidation skin, fat and the remainder on surface, and it can activate the surface of steel, decrease interfacial force of molten metal, improve the soakage ability of zinc liquid, and increase the binding capacity of the zinc clad layer.

Description

Technical field [0001] The invention relates to a process method for continuous hot-dip galvanizing of strip steel. Background technique [0002] The traditional process of continuous hot-dip galvanizing of strip steel includes: cleaning step: for cleaning and removing residues on the surface of the strip steel; heat treatment step: for annealing heat treatment strip steel in a protective gas atmosphere, and then removing the The steel is sent to the galvanizing process; the hot-dip galvanizing step: used to coat the surface of the strip. After the cleaning step, the heat treatment step will be carried out, and the grease and scale on the surface of the strip will not be removed, which will not only increase the surface tension of the molten metal, but also reduce the wetting ability of the zinc solution and reduce the binding force of the coating. Contents of the invention [0003] In order to overcome the deficiency that the existing process of continuous hot-dip galvan...

Claims

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Application Information

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IPC IPC(8): C23C2/00C23C2/02C23F17/00C23G1/00C21D1/74C21D9/52
CPCY02P10/20
Inventor 罗烈明
Owner 福建爱溥环保设备有限公司
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