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Method for reducing black spot defect of hot-dip galvanized sheet

A hot-dip galvanized sheet, defect technology, applied in hot-dip plating process, coating, metal material coating process and other directions, can solve the problem that the appearance of finished products, corrosion resistance, conductivity, and blackening resistance coating cannot be effectively obtained. Balance and other issues, to achieve the effect of excellent appearance quality, improved corrosion resistance and wear resistance, and simple process

Active Publication Date: 2020-01-10
安徽汇源镀锌有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the methods in the prior art cannot effectively balance the appearance, corrosion resistance, electrical conductivity, blackening resistance, and paintability of the finished product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for reducing black spot defects of hot-dip galvanized sheets, comprising the following steps:

[0020] (1) In parts by weight, add 55 parts of erucic acid to 70 parts of n-hexane, continuously add 25 parts of ammonia water with a mass fraction of 25% under stirring, heat the water bath to 65°C, and saponify for 45 minutes to obtain a saponified solution ;

[0021] (2) In parts by weight, 8 parts of neodymium chloride and 18 parts of samarium chloride are added to 120 parts of water, after mixing and stirring evenly, they are added to 160 parts of saponified liquid, after stirring and extracting for 40 minutes, the organic phase is collected, and the organic After removing n-hexane by rotary evaporation at a temperature of 70°C, the erucic acid mixed rare earths were obtained;

[0022] (3) In parts by weight, 18 parts of methacryloxypropyltriethoxysilane was added to 950 parts of water, after hydrolysis treatment, 220 parts of polyethyleneimine and 10 parts of ...

Embodiment 2

[0025] A method for reducing black spot defects of hot-dip galvanized sheets, comprising the following steps:

[0026] (1) In parts by weight, add 58 parts of erucic acid to 75 parts of n-hexane, continuously add 28 parts of ammonia water with a mass fraction of 25% under stirring, heat the water bath to 68°C, and saponify for 48 minutes to obtain a saponified solution ;

[0027] (2) In parts by weight, 11 parts of neodymium chloride and 20 parts of samarium chloride are added to 130 parts of water, after mixing and stirring evenly, they are added to 165 parts of saponified liquid, after stirring and extracting for 45 minutes, the organic phase is collected, and the organic After removing n-hexane by rotary evaporation at a temperature of 70°C, the erucic acid mixed rare earths were obtained;

[0028] (3) In parts by weight, 20 parts of methacryloxypropyltriethoxysilane was added to 980 parts of water, after hydrolysis treatment, 230 parts of polyethyleneimine and 13 parts of...

Embodiment 3

[0031] A method for reducing black spot defects of hot-dip galvanized sheets, comprising the following steps:

[0032] (1) In parts by weight, add 60 parts of erucic acid to 80 parts of n-hexane, continuously add 30 parts of ammonia water with a mass fraction of 25% under stirring, heat the water bath to 70° C., saponify for 50 minutes, and obtain a saponified liquid ;

[0033] (2) In parts by weight, 15 parts of neodymium chloride and 22 parts of samarium chloride are added to 140 parts of water, after mixing and stirring evenly, they are added to 170 parts of saponification liquid, after stirring and extracting for 50 min, the organic phase is collected, and the organic After removing n-hexane by rotary evaporation at a temperature of 70°C, the erucic acid mixed rare earths were obtained;

[0034] (3) In parts by weight, 22 parts of methacryloxypropyltriethoxysilane was added to 1000 parts of water, after hydrolysis treatment, 250 parts of polyethyleneimine and 15 parts of ...

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PUM

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Abstract

The invention discloses a method for reducing the black spot defect of a hot-dip galvanized sheet. The method comprises the following operation steps: step (1). adding an erucic acid to n-hexane, continuously adding ammonia water under stirring, and after heating in water bath, performing saponification reaction to obtain saponification liquid; step (2). adding neodymium chloride and samarium chloride to water, mixing and stirring uniformly, adding the mixture to the saponification liquid, after stirring and extracting, collecting an organic phase, and after performing rotary evaporation on the organic phase to remove the n-hexane, obtaining erucic acid mixed rare earth; step (3). adding methacryloxypm-pyltriethoxysilane to water, after performing hydrolysis treatment, adding polyethylenimine and the erucic acid mixed rare earth to the mixture, mixing and stirring uniformly to obtain a passivation solution; and step (4). putting the hot-dip galvanized sheet in the passivation solution,after performing passivation treatment for 80 to 100 seconds, taking out and cooling to a room temperature to obtain the hot-dip galvanized sheet after passivation treatment. The hot-dip galvanized sheet prepared by the method has excellent appearance quality, excellent corrosion resistance, and excellent electrical conductivity.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanized sheet preparation, in particular to a method for reducing black spot defects of a hot-dip galvanized sheet. Background technique [0002] Hot-dip galvanized sheet is a thin steel sheet that is immersed in a molten zinc bath to make a layer of zinc adhere to its surface. Hot-dip galvanized steel sheets are widely used in industries such as construction, home appliances, and automobiles for their excellent corrosion resistance and clean appearance. During transportation or storage, hot-dip galvanized sheets are prone to black spot defects due to the extrusion of steel coils and the misalignment between strip layers. Black spot defects not only affect the appearance of the galvanized sheet surface, but also reduce the The corrosion resistance of galvanized sheets will eventually lead to degradation and scrapping of hot-dip galvanized sheets. [0003] Galvanizing the surface of steel shee...

Claims

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Application Information

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IPC IPC(8): C23C2/26C23C2/06C23C2/40C23C22/53
CPCC23C2/06C23C2/26C23C2/40C23C22/53C23C2222/20
Inventor 姚道昌
Owner 安徽汇源镀锌有限公司
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