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Chemical treatment steel sheet and method for manufacturing chemical treatment steel sheet

Inactive Publication Date: 2020-04-23
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a chemical treatment steel sheet with excellent resistance to corrosion and sulfide staining, even if the amount of chemical treatment layer is small. The method for manufacturing this chemical treatment steel sheet is also provided.

Problems solved by technology

Corrosion is occurred when metals are continuously used in some cases.
However, since hexavalent chromium used in a chromate treatment is harmful to the environment, a chemical treatment film such as a Zr-phosphate film has been developed as a replacement for the chromate treatment applied to a steel sheet for containers in the related art.
When foods containing sulfur-containing amino acids is heated during sterilization, S in the sulfur-containing amino acids binds to Sn, Fe, or the like in a steel sheet for containers, resulting in black discoloration.

Method used

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  • Chemical treatment steel sheet and method for manufacturing chemical treatment steel sheet
  • Chemical treatment steel sheet and method for manufacturing chemical treatment steel sheet

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0116]In Example 1, how sulfide stain resistance changes was examined by changing the amount of Al compound, without changing the amounts of Zr compound and phosphate compound in chemical treatment layers.

[0117]In Example 1, steel sheets that are generally used as steel sheets for containers were used as a base material. Fe—Sn alloy layers and Sn layers were formed on the steel sheets by performing reflow treatment in a state in which Sn-plated layers were formed on the steel sheets. The total amount of Sn contained in the Fe—Sn alloy layer and the Sn layer was set to 2.8 g / m2 per one surface for all samples.

[0118]Further, chemical treatment layers were formed by changing the concentration of Al compounds in the chemical treatment layers of each sample, and thereby a plurality of samples were produced. Here, the amount of Zr contained in the Zr compound in each sample was 8 mg / m2 per one surface, and the amount of P contained in the phosphate compound was 3 mg / m2 per one surface.

[01...

example 2

[0134]Next, how sulfide stain resistance changes while the amount of each component contained in each chemical treatment layer 107 is changed was examined.

[0135]More specifically, chemical treatment layers were formed on Sn layers using steel sheets on which Fe—Sn alloy layers and the Sn layers had been formed.

[0136]In addition, chemical treatment layers were formed using Al2(SO4)3 as a supply source of Al ions in Comparative Examples a5 and a6 while (NH4)3AlF6 was used as a supply source of Al ions in Invention Examples A1 to A18 and Comparative Examples a1 to a4.

[0137]With respect to the chemical treatment steel sheets of A1 to A18 and a1 to a6, the amounts of Zr, P, and Al contained in the chemical treatment layers were measured using a fluorescent X-ray adhesion meter, and then corrosion resistance and sulfide stain resistance thereof were evaluated.

[0138]In addition, for the amount of Al2O3 contained in the chemical treatment layers, peak intensity ratios of Al2O3, Al metal, an...

example 3

[0154]Next, how sulfide stain resistance changes according to the amount of Sn and the amount of each component contained in chemical treatment layers was examined.

[0155]The amount of S in each of the samples is shown in Table 2, and conditions for chemical treatment (conditions for chemical treatment solutions and conditions for electrolytic treatment) are shown in Table 3. The amounts of Zr, P, Al, and Al2O3 contained in the chemical treatment layers formed in each of the samples are shown in Table 4.

[0156]In addition, corrosion resistance and sulfide stain resistance were evaluated for each of the samples as in Example 2. The results are shown in Table 4.

[0157]Note that the chemical treatment layers were formed using Al2(SO4)3 as a supply source of Al ions in Comparative Examples b9 and b10 while (NH4)3AlF6 was used as a supply source of Al ions in Invention Examples B1 to B31 and Comparative Examples b1 to b8.

TABLE 2Plated LayerAmount of Sn as Sn metalSymbol(g / m2)InventionB117Ex...

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Abstract

A chemical treatment steel sheet includes a steel sheet, an Fe—Sn alloy layer which is formed on at least one surface of the steel sheet, a Sn layer which is formed on the Fe—Sn alloy layer and contains Sn in which a total amount of Sn contained in the Fe—Sn alloy layer and the Sn layer is 0.10 to 30.0 g / m2, and a chemical treatment layer which is formed on the Sn layer and contains a Zr compound in which an amount of Zr contained therein is 1.0 to 150 mg / m2, a phosphate compound in an amount of P contained therein is 1.0 to 100 mg / m2 and an Al compound in an amount of Al contained therein is 0.10 to 30.0 mg / m2.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to a chemical treatment steel sheet and a method for manufacturing a chemical treatment steel sheet.BACKGROUND ART[0002]Corrosion is occurred when metals are continuously used in some cases. Various techniques have been proposed to prevent corrosion of metals. Examples of the proposed techniques include a technique of applying plating to a metal plate or a technique of performing various surface treatments on the surface of a metal plate of a plated surface.[0003]For example, Patent Document 1 describes a technique of forming an organic resin film including a vanadium compound or at least one of a phosphate and phosphate-based compound, a silane compound having at least one of an epoxy group and an amino group, and an organic resin including at least one of a water-soluble organic resin and a water-dispersible organic resin as main components on a surface of an Al—Zn-based alloy plated steel sheet used for building ...

Claims

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Application Information

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IPC IPC(8): C23C22/36C23C2/08C25D3/30C23C28/02C25D5/48C21D9/46C25B9/19
CPCC23C22/361C23C2/08C21D9/46C23C28/021C25D5/48C25D3/30C25D11/00C23C28/00C23C22/20C25D11/36C25D9/10C25D9/08C25D7/0614C25B9/19C25D5/10C23C2/28C23C28/321C23C28/34
Inventor TANI, YOSHIAKIHIRANO, SHIGERUTACHIKI, AKIRAYANAGIHARA, MORIOKAWABATA, MAKOTOYOKOYA, HIROKAZU
Owner NIPPON STEEL CORP
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