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Sn-plated steel sheet

A steel plate and coating technology, which is applied in the field of Sn-based plated steel plates, can solve the problems of reduced sulfur blackening resistance, reduced coating film adhesion, and yellowing appearance, and achieves excellent sulfuration blackening resistance and coating film adhesion excellent effect

Pending Publication Date: 2022-07-29
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned above, the Sn-based plated steel sheet without a chromate coating will cause yellowing in appearance, decrease in adhesion of the coating film, or decrease in resistance to sulfide blackening due to the growth of tin oxide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] According to the method described in the above-mentioned , the adhesion amount of zirconium oxide and manganese oxide was changed, and the Sn-based plated steel sheet was produced.

[0144] Sn plating can be produced from a well-known tin-plated steel sheet bath by an electrolytic method. The amount of Sn adhesion reaches 0.05g / m 2 Above and 20g / m 2 The amount of current during electrolysis changes. In addition, both the test piece to which the heating and melting process was performed after the Sn plating and the test piece not to which the heating and fusion process was performed were produced.

[0145] When a film containing zirconium oxide and manganese oxide is formed on the Sn-plated surface, the Sn-based plated steel sheet is subjected to an aqueous solution having a zirconium ion concentration of 50 ppm or more and 5000 ppm or less and a manganese ion concentration of 3.5 ppm or more and 12500 ppm or less. Cathodic electrolysis forms various coating layers in...

Embodiment 2

[0152] Next, according to the method described in the above-mentioned , the distribution of zirconium oxide and manganese oxide in the coating layer was changed, and an Sn-based plated steel sheet was produced.

[0153] Sn plating can be achieved by electrolysis from a well-known tin-plated steel sheet bath with a Sn adhesion amount of 2.8 g / m 2 way to make.

[0154] Thereafter, the Sn-based plated steel sheet was subjected to cathodic electrolysis (first treatment) in an aqueous solution containing no manganese ions but zirconium ions, and then washed with water for the washing time shown in Table 2 below, and further, without Instead of zirconium ions, cathodic electrolysis (second treatment) was performed in an aqueous solution containing manganese ions to prepare test pieces B1 to B6. In addition, as in Example 1, cathodic electrolysis was performed in an aqueous solution containing zirconium ions and manganese ions, followed by washing with water for the washing time sho...

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Abstract

Provided is a Sn-based plated steel sheet having excellent yellowing resistance, coating film adhesion, and sulfur blackening resistance without being subjected to conventional chromate treatment. This Sn-plated steel sheet has a steel sheet, an Sn-plated layer positioned on at least one surface of the steel sheet, and a coating layer positioned on the Sn-plated layer, the Sn-plated layer containing 0.10-15.00 g / m2 of Sn per single surface in terms of metal Sn, the coating layer containing Zr oxide and Mn oxide, the content of Zr oxide being 0.20-50.00 mg / m2 per single surface in terms of metal Zr, and the content of Mn oxide being 0.20-0.50 mg / m2 per single surface in terms of metal Zr. The content of the Mn oxide in terms of metal Mn is 0.01-0.50 times by mass relative to the content of the Zr oxide in terms of metal Zr, and the depth position A at which the elemental concentration of Mn is maximum is positioned on the surface side of the coating layer compared to the depth position B at which the elemental concentration of Zr is maximum in depth-direction elemental analysis by XPS. The distance in the depth direction between the depth position A and the depth position B is 2 nm or more.

Description

technical field [0001] The present invention relates to Sn-based plated steel sheets. Background technique [0002] Tin (Sn)-based plated steel sheets are widely known as "tin-plated iron sheets", and are used for can applications such as beverage cans and food cans, and other applications. This is because: Sn is a metal that is safe for the human body and aesthetically pleasing. The Sn-based plated steel sheet is mainly produced by an electroplating method. This is because the electroplating method is advantageous compared with the molten plating method in order to limit the amount of Sn, which is a relatively expensive metal, to the minimum necessary amount. After the Sn-based plated steel sheet is imparted with a beautiful metallic luster after plating or by heat-melting treatment after plating, it is treated with chromate treatment (electrolytic treatment, dipping treatment, etc.) using a hexavalent chromate solution. There are many cases where a chromate coating is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C25D5/26C25D9/08
CPCC23C28/00C25D9/08C23C28/30C23C28/345C23C28/3455C23C28/32C23C28/321C23C28/322C25D5/505C25D3/32C25D5/36B65D65/42B32B15/04
Inventor 山中晋太郎平野茂
Owner NIPPON STEEL CORP
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