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Tin-containing coated steel sheet and preparation method thereof

A technology for tin coating and steel plate, applied in the field of tin-containing coating steel plate and its preparation, can solve the problems of long process flow and high labor input cost, and achieve the effects of good corrosion resistance, reduced labor and material cost, and reduced tin consumption.

Inactive Publication Date: 2015-11-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this method requires both electrogalvanizing and tin electroplating, the electroplating process is long, and the cost of equipment, plant and labor input in the manufacturing process is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of the above-mentioned tin-coated steel plate comprises the following steps:

[0025] 1) The high-quality low-carbon cold-rolled thin steel plate with a thickness of 0.16-0.55mm is degreased, derusted and cleaned, and activated with an acid solution with a weight percentage of 20-25%;

[0026] 2) Wash the activated steel plate with water and then electroplate tin-zinc alloy. The composition of the plating solution is: stannous fluoroborate [Sn(BF 4 ) 2 ]: 35~45g / L, zincous fluoroborate [Zn(BF 4 ) 2 ]: 95~105g / L, polyethylene glycol: 1.5~2.5g / L; pH value: 1.5~2.5; the anode material for electroplating is a tin-zinc alloy sheet containing 75~85% tin.

[0027] 3) Clean the tin-zinc alloy-plated steel plate with water, then reflow the steel plate at 300-400°C with a resistance reflow furnace, then perform quenching, soda cleaning, and chromate cathodic passivation. The passivation solution composition is : Sodium dichromate 20~25g / L, sulfuric acid...

Embodiment 1

[0030] The sample is made of high-quality low-carbon cold-rolled thin steel plate, the sample size (thickness × width × length): 0.16 × 80 × 80mm, the preparation steps are as follows;

[0031] 1) The steel plate is first degreased, derusted, and cleaned;

[0032] 2) Activate the steel plate with 20% hydrochloric acid by weight;

[0033] 3) Wash the activated steel plate with water and send it to the electroplating tank for electroplating tin-zinc alloy. The composition of the plating solution is: stannous fluoroborate [Sn(BF 4 ) 2 ]: 35g / L, zincous fluoroborate [Zn(BF 4 ) 2 ]: 105g / L, polyethylene glycol: 1.5 g / L; pH value: 1.5~2.5; electroplating temperature: room temperature; cathode current density: 12A / dm 2 . The amount of tin-zinc alloy in the resulting coating is 0.8g / m 2 .

[0034] 4) Clean the tin-zinc alloy-plated steel plate with water, and then use a resistance reflow furnace to reflow the steel plate at 300-400°C (flux composition: zinc chloride 44%, ammoni...

Embodiment 2

[0036] The sample is made of high-quality low-carbon cold-rolled thin steel plate. The sample size (thickness×width×length): 0.24×80×80mm. The preparation steps are as follows;

[0037] 1) The steel plate is first degreased, derusted, and cleaned;

[0038] 2) the steel plate is activated with 22% sulfuric acid by weight percentage;

[0039] 3) Wash the activated steel plate with water and send it to the electroplating tank for electroplating a tin-zinc alloy containing 75-85% tin. The composition of the plating solution is: stannous fluoroborate [Sn(BF 4 ) 2 ]: 40g / L, zincous fluoroborate [Zn(BF 4 ) 2 ]: 100g / L, polyethylene glycol: 2.0 g / L; pH value: 1.5~2.5; electroplating temperature: room temperature; cathode current density: 16A / dm 2 . The amount of tin-zinc alloy in the resulting coating is 5g / m 2 .

[0040] 4) Clean the steel plate after plating the tin-zinc alloy coating containing 75-85% tin with water, and then use a resistance reflow furnace to reflow the ste...

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Abstract

The invention discloses a steel sheet with a stanniferous coating and a preparation method thereof. The method comprises the following steps: 1) subjecting a high-quality low-carbon cold-rolled steel sheet to deoiling, rust removal and cleaning and then to activation with an acid solution and rinsing; 2) carrying out electroplating, wherein an electroplating solution comprises 35 to 45 g / L of Sn(BF4)2, 95 to 105 g / L of Zn(BF4)2 and 1.5 to 2.5 g / L of polyethylene glycol and has a pH value of 1.5 to 2.5; 3) cleaning the electroplated steel sheet with water and subjecting the steel sheet to soft heating, hardening, cleaning with soda and chromate cathodic passivation; and 4) cleaning the passivated steel sheet with water and blow-drying the steel sheet so as to obtain a finished product. The content of a stannum-zinc alloy in the steel sheet with the stanniferous coating prepared in the invention is 0.8 to 16 g / m<2>, the weight percentage of stannum in the tin-zinc alloy coating is 75 to 85%, the usage amount of stannum is reduced, and corrosion resistance of the sheet is obtained.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to a tin-containing coated steel plate and a preparation method thereof. Background technique [0002] Since tin is non-toxic and harmless to the human body, tin plate is often used to make food cans and beverage cans. The earliest tinplate was prepared by hot-dip tinning, that is, tin was melted at high temperature and then coated on the surface of the steel plate. When the tinplate produced by this method was not only poor in uniformity, but also because the tin layer was thicker, High cost. With the advancement of science and technology, people began to use the electroplating method to deposit the tin layer on the surface of the steel plate by electrodeposition to prepare tin-plated plates. Since the tin layer of the tin plate prepared by the electroplating method is uniform, the thickness of the tin is greatly reduced compared with that of hot-dip tin, so th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/01C25D3/60C25D5/50
Inventor 柳长福涂元强白会平宋乙峰
Owner 武汉钢铁有限公司
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