Surface treatment liquid, surface treatment method and tin-plated steel sheet by surface treatment

A technology of surface treatment liquid and tin-plated steel plate, which is applied in the coating process of metal materials, etc., can solve the problems of corrosion resistance and sulfur spot resistance that are difficult to achieve, and achieve excellent sulfur spot resistance, easy implementation, and significant economy benefit effect

Active Publication Date: 2009-09-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the traditional chromate-treated coating, the existing chromium-free surface treatment technology is still difficult to achieve corrosion resistance and sulfur spot resistance comparable to chromium treatment

Method used

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  • Surface treatment liquid, surface treatment method and tin-plated steel sheet by surface treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～18

[0049] The sample preparation is carried out in the following way: After electrolytic degreasing of 0.2mm thick T4 cold-rolled steel plate, it is annealed in a continuous annealing furnace. The atmosphere in the furnace is 5%volH2+95volN2 gas, and the maximum heating temperature is 720°C. After annealing, a leveling treatment with an elongation rate of 2% is carried out. Then the steel plate can be prepared for tin plating after pretreatment such as degreasing and pickling. Tin plating is carried out in phenol sulfonate tin plating solution (PSA), and the tin plating weight is 5.6g / m2. The process conditions of tin plating solution are as follows:

[0050] PSA: Sn2+: 28g / L

[0051] Phenolsulfonic acid: 16g / L

[0052] Bath temperature: 45°C

[0053] Current density: 20A / dm 2

[0054] The tin-plated steel sheet is subjected to reflow treatment at a temperature above the melting point of tin, and a Sn-Fe alloy layer is formed between the steel substrate and the tin layer. ...

Embodiment 19～24

[0056] Except that MSA plating solution is used for electroplating tin, other conditions are the same as those in Examples 1-6.

[0057] MSA: Sn2+: 21g / L

[0058] Methanesulfonic acid: 30g / L

[0059] Bath temperature: 50°C

[0060] Current density: 20A / dm 2

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Abstract

The invention provides a surface treatment liquid used for tin-plated steel sheets, which contains 1 to 50 g / L of phosphorus compound, 1 to 20 g / L of vanadium compound, 1 to 30 g / L of compound selected from one or more of molybdenum, zirconium, titanium, manganese and tungsten metal compounds, and 1 to 10 g / L of one or more compounds with at least one functional group of hydroxyl, carbonyl, carboxyl and phosphate. The invention also provides a surface treatment method using the surface treatment liquid, and a tin-plated steel sheet treated by the surface treatment liquid. By using the surface treatment liquid and the surface treatment method of the invention, chromium which is unfavorable for the environment is not contained in the process of producing the tin-plated steel sheets, and the cost is low. The tin-plated steel sheet has favorable sulfide spot resistance, paint wetting performance, coating adhesion and processing performance.

Description

technical field [0001] The present invention relates to the surface treatment of steel sheets, in particular, the present invention relates to the surface treatment of tin-plated steel sheets. Background technique [0002] As a metal packaging material, tin-plated steel is usually used in the packaging of food or beverages because of its good corrosion resistance. However, due to the substances in the tank such as oxygen, sulfur, chloride ions or acid ions, Corrosion still occurs slowly. In order to prevent corrosion, the tin-plated steel sheet is traditionally dipped or electrolytically treated in a chromium-containing treatment solution such as chromic acid or chromate, so as to form a chromate film on the surface of the tin layer. [0003] The film formed by immersion or electrolytic treatment in chromic acid or chromate treatment solution can effectively prevent the growth of tin oxide, thus endowing the tin-plated steel sheet with excellent corrosion resistance and sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07C23C22/08
Inventor 黄邦霖李鹏晏人芸倪骅
Owner BAOSHAN IRON & STEEL CO LTD
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