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

a technology of chemical treatment steel and steel sheet, which is applied in the direction of electrolytic inorganic material coating, superimposed coating process, coating, etc., can solve the problems of black discoloration and corrosion, and achieve excellent corrosion resistance and sulfide stain resistance

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 patent text describes a way to make a chemical treatment steel sheet that has good resistance to corrosion and sulfide staining, even if there is only a small amount of chemical treatment on the sheet. This method can be used to make the steel sheet.

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

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0135]In Example 1, how a sulfide stain resistance changes was examined by changing the amount of Al compound without changing the Zr compound and phosphate compound content in a chemical treatment layer.

[0136]In Example 1, steel sheets which are generally used as steel sheets for containers were used as base materials and a Ni-plated layer was formed as a plated layer. The amount of Ni contained in the Ni-plated layer was set at 1000 mg / m2 per one surface in all samples. Furthermore, a chemical treatment layer is formed by changing a concentration of an Al compound in a chemical treatment layer for each sample to manufacture a plurality of samples. Here, in each sample, the amount of Zr contained in the Zr compound was 8 mg / m2 per one surface and the amount of P contained in the phosphate compound was 3 mg / m2 per one surface.

[0137]The sulfide stain resistance was evaluated as follows. First, a 0.6 mass % L-cysteine liquid boiled for one hour was put into a heat-resistant bottle and...

example 2

[0152]Next, how the sulfide stain resistance changes while a type of a plated layer and the amount of each component contained in a chemical treatment layer is changed was examined. In examples and comparative examples except for Comparative Example a5, a plated layer is any one of a Ni-plated layer and a composite plated layer. On the other hand, in Comparative Example a5, a composite plated layer is formed on a Ni-plated layer (two plated layers are formed).

[0153]Also, (NH4)3AlF6 was used as a supply source of Al ions in Examples A1 to A31 of the present invention and Comparative Examples a1 to a6, whereas Al2(SO4)3 was used as a supply source of Al ions in Comparative Examples a7 and a8 to form a chemical treatment layer.

[0154]The amounts of Ni metal and Sn metal contained in a plated layer and the amounts of Zr, P, and Al contained in a chemical treatment layer were measured using a fluorescent X-ray analysis.

[0155]In the Al2O3 content in a chemical treatment layer, first, peak ...

example 3

[0173]Next, how the sulfide stain resistance changes according to a type of plated layer and the each component contained in a chemical treatment layer was examined.

[0174]For each sample having a Ni-plated layer or a composite plated layer shown in Table 3, a chemical treatment was performed under the conditions shown in Table 4 (conditions for a chemical treatment solution and conditions for an electrolytic treatment). Table 5 shows the amounts of Zr, P, Al, and Al2O3 included in a chemical treatment layer formed on a plated layer of each sample.

[0175]Also, for each sample having a plated layer and a chemical treatment layer, corrosion resistance and sulfide stain resistance were evaluated as in Example 2. The results are shown in Table 5.

[0176](NH4)3AlF6 was used as a supply source of Al ions in Examples B1 to B31 of the present invention and Comparative Examples b1 to b8, whereas Al2(SO4)3 was used as a supply source of Al ions in Comparative Examples b9 and b10 to form a chemica...

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Abstract

A chemical treatment steel sheet contains: a steel sheet; a plated layer containing Ni and formed on at least one surface of the steel sheet; a chemical treatment layer containing a Zr compound in which an amount of Zr contained therein is 1.0 to 150 mg / m2, a phosphate compound in which an amount of P contained therein is 1.0 to 100 mg / m2, and an Al compound in which an amount of Al contained therein is 0.10 to 30.0 mg / m2. The plated layer is a Ni-plated layer containing Ni in which an amount of Ni contained therein is 5.0 to 3000 mg / m2 or a composite plated layer containing Ni in which an amount of Ni contained therein is 2.0 to 200 mg / m2 and Sn in which an amount of Sn contained therein is 0.10 to 10.0 g / m2 and having an island-shaped Sn-plated layer formed on a Fe—Ni—Sn alloy layer.

Description

TECHNICAL FIELD[0001]The present invention relates to a chemical treatment steel sheet and a method for manufacturing a chemical treatment steel sheet.RELATED 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 materials and home a...

Claims

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Application Information

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IPC IPC(8): C23C28/00C25D3/56C25D5/48C25D11/36
CPCC25D11/36C25D5/48C23C28/345C23C28/321C25D3/562C25D9/08C23C28/00C23C22/20C23C22/361C25D5/505C25D5/12C25D7/0614C25D9/10C23C28/34
Inventor TANI, YOSHIAKIHIRANO, SHIGERUTACHIKI, AKIRAYANAGIHARA, MORIOKAWABATA, MAKOTOYOKOYA, HIROKAZU
Owner NIPPON STEEL CORP
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