A strip steel hot-dip galvanizing process

A technology of hot-dip galvanizing and strip steel, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve the problem of unsatisfactory effect improvement, and achieve excellent peeling resistance and corrosion resistance Effect

Active Publication Date: 2011-12-07
WUXI GUANGRUN METAL PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its effect improvement is not very ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example one

[0018] A hot-dip galvanizing process for strip steel, the composition of the strip steel is C: 0.2-0.25%, Mn: 1.2-1.5%, Si: 0.8-1.2%, P: ≤ 0.015%, S: ≤ 0.02% , The rest is Fe; the process includes the following steps:

[0019] (1) Strip cleaning treatment: After the strip is uncoiled, pickling is performed to remove the oxide film. The pickling solution is 25% hydrochloric acid, Tween-60 0.8% and water. Mechanical stirring is used while pickling; Then electrolytic degreasing treatment is carried out directly without clear water. The formula of electrolytic degreasing solution is 10 parts by weight sodium carbonate, 25 parts sodium phosphate, 60 parts sodium hydroxide and 300 parts water. The temperature of electrolytic degreasing is 60℃; Then enter the clean water tank for cleaning;

[0020] (2) Strip annealing treatment: The strip after degreased and cleaned is quickly blown dry with a nitrogen nozzle and enters a continuous annealing furnace under nitrogen pr...

Example Embodiment

[0025] Example two

[0026] A hot-dip galvanizing process for strip steel, the composition of the strip steel is C: 0.2-0.25%, Mn: 1.2-1.5%, Si: 0.8-1.2%, P: ≤ 0.015%, S: ≤ 0.02% , The rest is Fe; the process includes the following steps:

[0027] (1) Strip cleaning treatment: After the strip is uncoiled, pickling is performed to remove the oxide film. The pickling solution is hydrochloric acid with a concentration of 30%, Tween-60 0.5% and water. The pickling uses ultrasonic stirring at the same time; The electrolytic degreasing treatment is carried out directly without clear water. The formula of the electrolytic degreasing solution is 15 parts by weight sodium carbonate, 20 parts sodium phosphate, 70 parts sodium hydroxide and 270 parts water. The temperature of electrolytic degreasing is 80℃; after electrolytic degreasing Enter the clean water tank for cleaning;

[0028] (2) Strip annealing treatment: The strip after degreasing and cleaning is quickly blown dry with a nitrogen ...

Example Embodiment

[0033] Example three

[0034] A hot-dip galvanizing process for strip steel, the composition of the strip steel is C: 0.2-0.25%, Mn: 1.2-1.5%, Si: 0.8-1.2%, P: ≤ 0.015%, S: ≤ 0.02% , The rest is Fe; the process includes the following steps:

[0035] (1) Strip cleaning treatment: After the strip is uncoiled, pickling is performed to remove the oxide film. The pickling solution is 28% hydrochloric acid, Tween-60 0.6% and water. The pickling is carried out with ultrasonic stirring; then The electrolytic degreasing treatment is carried out directly without clean water. The formula of the electrolytic degreasing solution is 13 parts by weight sodium carbonate, 23 parts sodium phosphate, 65 parts sodium hydroxide and 280 parts water. The temperature of electrolytic degreasing is 70℃; after electrolytic degreasing Enter the clean water tank for cleaning;

[0036] (2) Strip annealing treatment: the strip steel after degreasing and cleaning is quickly blown dry with a nitrogen nozzle, and e...

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Abstract

The invention discloses a strip steel hot-dip galvanizing technology. The technology comprises the following steps: 1) pickling, adding surfactant in the pickling solution to remove oxide on the surface of the strip steel and lay a foundation for the increase of the corrosion resistance of the coating; and 2) adopting a coating solution formula to further increase the corrosion resistance of the coating. The coating solution comprises the following components by weight percent: 1.5-2.0% of Al, 1.3-1.8% of Mg, 0.2-0.6% of Cu, 0.02-0.05% of Sn, 0.05-0.15% of Ce and the balance of Zn.

Description

technical field [0001] The invention relates to the field of strip steel hot-dip galvanizing, in particular to a strip steel hot-dip galvanizing process. Background technique [0002] During the processing of continuous hot-dip galvanized steel strip, there are steps of pre-cleaning and hot-dip galvanizing. The responsibility of the pre-cleaning step is to remove the oil stains, iron filings, and dust adhering to the surface of the steel strip, so that the steel strip can enter the hot-dip galvanizing step when the surface is sufficiently clean to ensure that the surface coating and the steel strip ( Also known as the substrate) has excellent adhesion. It goes without saying that the quality of the pre-cleaning effect will directly affect the galvanized steel strip. At present, the processes used in the industry for the pre-cleaning steps include: lye spraying, lye scrubbing, electrolytic degreasing, water scrubbing and water rinsing. However, practice has proved that the...

Claims

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Application Information

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IPC IPC(8): C23C2/02C23C2/40C23C2/06C23G1/08C25F1/06
Inventor 王一新黎立
Owner WUXI GUANGRUN METAL PROD CO LTD
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