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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 (salt spray resistance test is more than 95h)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A strip steel hot-dip galvanizing process, 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% , and the rest are Fe; the process comprises the following steps:

[0019] (1) strip steel cleaning treatment: after the strip steel is uncoiled, pickling treatment is carried out earlier to remove the oxide film, and the pickling solution is hydrochloric acid with a concentration of 25%, Tween-60 0.8% and water, and mechanical stirring is adopted during pickling; Then directly carry out electrolytic degreasing treatment without clear water, the formula of electrolytic degreasing solution is 10 parts by weight percentages of sodium carbonate, 25 parts of sodium phosphate, 60 parts of sodium hydroxide and 300 parts of water, the temperature of electrolytic degreasing is 60 ℃; Then enter the clear water tank for cleaning;

[0020] (2) Strip steel annealing treatment: the degreased and cleaned strip steel is quickly dried with a ...

Embodiment 2

[0026] A strip steel hot-dip galvanizing process, 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% , and the rest are Fe; the process comprises the following steps:

[0027] (1) strip steel cleaning treatment: after the strip steel is uncoiled, pickling treatment is carried out earlier to remove the oxide film, and the pickling solution is 30% hydrochloric acid, Tween-60 0.5% and water, and the pickling adopts ultrasonic stirring simultaneously; Carry out electrolytic degreasing treatment directly without clear water, the formula of electrolytic degreasing solution is 15 parts by weight of sodium carbonate, 20 parts of sodium phosphate, 70 parts of sodium hydroxide and 270 parts of water, the temperature of electrolytic degreasing is 80 ℃; after electrolytic degreasing Enter the clean water tank for cleaning;

[0028] (2) Strip steel annealing treatment: The degreased and cleaned strip steel is quickly blown dry with a nitr...

Embodiment 3

[0034] A strip steel hot-dip galvanizing process, 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% , and the rest are Fe; the process comprises the following steps:

[0035] (1) strip steel cleaning treatment: after the strip steel is uncoiled, carry out pickling treatment to remove oxide film earlier, the pickling solution is the hydrochloric acid that concentration is 28%, Tween-60 0.6% and water, pickling adopts ultrasonic agitation simultaneously; Then Carry out electrolytic degreasing treatment directly without clean water, the formula of electrolytic degreasing solution is 13 parts by weight of sodium carbonate, 23 parts of sodium phosphate, 65 parts of sodium hydroxide and 280 parts of water, the temperature of electrolytic degreasing is 70 ℃; after electrolytic degreasing Enter the clean water tank for cleaning;

[0036] (2) Strip steel annealing treatment: the degreased and cleaned strip steel is quickly blown dry ...

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PUM

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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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