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Manufacturing method of zinc/tin double-layer electroplated steel plate

A manufacturing method, steel plate technology, applied in jewelry, etc., can solve problems such as pollution, human body damage to the environment, unfavorable welding processing, etc., and achieve the effect of improving corrosion resistance, cost reduction, and good corrosion resistance

Inactive Publication Date: 2012-10-31
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the TFS steel plate and the steel plate with a film on the surface of the TFS steel plate have good corrosion resistance, because hexavalent chromate is used in the formula for electrolytic chromate treatment, it will cause great damage to the human body and the environment. Causes greater pollution; in addition, the film-coated steel plate is not conducive to welding during the process of making three-piece cans

Method used

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  • Manufacturing method of zinc/tin double-layer electroplated steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The sample is made of high-quality low-carbon cold-rolled thin steel plate, the sample size: 120×120×0.18mm, and the preparation steps are as follows;

[0018] 1) The steel plate is first pickled, derusted, degreased and washed with water;

[0019] 2) The steel plate is then diluted with 10% by weight of H 2 SO 4 activation;

[0020] 3) Send the activated steel plate into the electroplating tank for galvanizing; the composition of the galvanizing solution is: zinc sulfate (ZnSO 4 ·7H 2 O): 475g / L, aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 O): 28g / L, sodium sulfate (Na 2 SO 4 ): 52g / L, alum (KAl(SO 4 ) 2 12H 2 O) 45g / L, pH value 3.8, temperature: room temperature, cathode current density: 3A / dm 2 , galvanizing weight: 2.8g / m 2 .

[0021] 4) Clean the surface of the steel plate after galvanizing with water, and immediately put it into an electroplating tank for tinning. The composition of the tinning solution is: stannous fluoroborate (Sn(BF 4 ) 2 )190g / L, f...

Embodiment 2

[0024] The sample is made of high-quality low-carbon cold-rolled thin steel plate, the sample size: 120×120×0.25mm, and the preparation steps are as follows;

[0025] 1) The steel plate is first pickled, derusted, degreased and washed with water;

[0026] 2) The steel plate is then diluted with 15% by weight of H 2 SO 4 activation;

[0027] 3) Send the activated steel plate into the electroplating tank for galvanizing; the composition of the galvanizing solution is: zinc sulfate (ZnSO 4 ·7H 2 O): 490g / L, aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 O): 30g / L, sodium sulfate (Na 2 SO 4 ): 48g / L, alum (KAl(SO 4 ) 2 12H 2 O) 48g / L, pH value 4, temperature: room temperature, cathode current density: 2A / dm 2 , galvanizing amount: 1.5g / m 2 .

[0028] 4) Clean the surface of the steel plate after galvanizing with water, and immediately put it into an electroplating tank for tinning. The composition of the tinning solution is: stannous fluoroborate (Sn(BF 4 ) 2 ) 200g / L, fl...

Embodiment 3

[0031] The sample is made of high-quality low-carbon cold-rolled thin steel plate, the sample size: 120×120×0.35mm, and the preparation steps are as follows;

[0032] 1) The steel plate is first pickled, derusted, degreased and washed with water;

[0033] 2) The steel plate is then diluted with 12% by weight H 2 SO 4 activation;

[0034] 3) Send the activated steel plate into the electroplating tank for galvanizing; the composition of the galvanizing solution is: zinc sulfate (ZnSO 4 ·7H 2 O): 480g / L, aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 O): 29g / L, sodium sulfate (Na2 SO 4 ): 49g / L, alum (KAl(SO 4 ) 2 12H 2 O) 46g / L, pH 4.3, temperature: room temperature, cathode current density: 1.5A / dm 2 , galvanizing weight: 4.0g / m 2 .

[0035] 4) Clean the surface of the steel plate after galvanizing with water, and immediately put it into an electroplating tank for tinning. The composition of the tinning solution is: stannous fluoroborate (Sn(BF 4 ) 2 )195g / L, fluoboric ...

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Abstract

The invention discloses a manufacturing method of a zinc / tin double-layer electroplated steel plate, which comprises the following steps: carrying out acid washing on a low-carbon cold-rolled steel plate, removing rust, degreasing, cleaning, and activating with dilute acid; electrogalvanizing the activated steel plate; washing the surface of the electrogalvanized steel plate with water, and carrying out tin electroplating; cleaning the sample with water, carrying out soft heating on the tin-electroplated plate with a resistance soft-heating furnace, carrying out water quenching, cleaning withsoda, and carrying out cathodic passivation with chromate; and washing the passivated zinc / tin double-layer electroplated steel plate with water, and carrying out blow-drying to obtain the finished product. The zinc / tin double-layer electroplated steel plate prepared by the method disclosed by the invention has the advantages of beautiful appearance, no toxicity, environmental protection and low cost; and the corrosion resistance of the zinc / tin double-layer electroplated steel plate is equivalent to that of a tin-electroplated steel plate.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a method for manufacturing a zinc-tin double-layer electroplated steel sheet. Background technique [0002] Because tin is non-toxic and harmless to the human body, people use tin plate to make food cans and beverage cans. The earliest tinplate is the method of hot-dip tinning, that is, tin is melted at high temperature and then tin is coated on the surface of the steel plate. The tinplate made by this method has a thick tin layer and poor uniformity, so the cost is high. very high. With the advancement of science and technology, people later used the method of electroplating to deposit the tin layer on the surface of the steel plate by electrodeposition. The tin layer of electroplated tin plate is uniform, the thickness of tin is greatly reduced compared with hot-dip tin, and the cost is greatly reduced. However, since tin is still a relatively precious met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/10C25D3/22C25D3/30C25D5/48C25D7/00
Inventor 柳长福涂元强蔡捷白会平文伟何锐
Owner 武钢集团有限公司
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