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Surface-Treated Steel Sheet, Organic Resin Coated Metal Container, and Method for Producing Surface-Treated Steel Sheet

a technology of organic resin and surface treatment, which is applied in the direction of coatings, electrolysis components, electrolysis processes, etc., can solve the problems of productivity load and energy-use load, restriction of the operation speed of the surface treatment line, and insufficient washing of the electrolytic chromic acid treated steel sheet, which is conventionally used, etc., to achieve excellent adhesiveness, excellent corrosion resistance, excellent effect of adhesion

Inactive Publication Date: 2016-08-11
TOYO KOHAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a surface-treated steel sheet that has excellent adhesiveness to an organic resin and resistance to corrosion and fluorine elution. The surface-treated steel sheet can prevent peeling of the organic resin layer and suppress elution of metal material components when there is a crack in the organic resin layer and a metal surface is exposed under a wet environment. The method using an ion-containing aqueous solution can change the hot water conventionally used to clean the electrolytic chromic acid treated steel sheet to warm water or room-temperature water, which reduces processing time and improves energy load characteristics.

Problems solved by technology

However, when a large coating amount as above is required, we have found that washing of the electrolytic chromic acid treated steel sheet, which is conventionally used, is insufficient in order to achieve the target surface treatment characteristics and suppression of elution.
Furthermore, we have also found that when diverting a conventional electrolytic chromic acid treatment line, because washing that is even longer than the conventional washing is required, there are many problems such as productivity load and energy-use load, etc., in other words, restriction in an operation speed of the surface treatment line, increase in the number of treatment tanks for washing, and use of a large volume of hot water, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0101]In the step of forming a layer, cathode electrolytic treatment was performed for 7 cycles to the steel sheet surface and the electrolytic treatment liquid was squeezed out. Then, the steel sheet was washed with water at the room temperature and further, the wash water was squeezed out with rolls. Next, in the step of adjusting the surface, the steel sheet was immersed into a mixed aqueous solution at 40° C. for one second, wherein sodium carbonate and sodium bicarbonate were mixed, and the pH was adjusted to 9.5. Following this, the steel sheet was further immersed into hot water of 95° C. for one second, washed with water after the aqueous solution is squeezing out with rolls, and dried after further squeezing out the wash water with rolls to obtain a surface-treated steel sheet.

[0102]Next, the Zr amount and F amount of the sheet after the step of forming a layer but before the step of adjusting the surface, and the surface-treated steel sheet after the step of adjusting the ...

examples 2 to 22

[0105]As in Example 1, conditions and the plating amount (the Zr amount and F amount) in the step of forming a layer, conditions used in the step of adjusting the surface and the F amount of the layer after having gone through the step, and the results of the performance evaluation for the organic-resin-coated surface-treated sheet and metal can are shown in Table 1. However, in Examples 3 to 11, Example 21, and Example 22, warm water washing was performed by immersion for the first half of the treatment time shown in Table 1 and spraying for the second half. As for Examples 14 to 16, in the step of adjusting the surface, surface adjustment was performed, while using the steel sheet as the cathode, by repeating the cycle of “0.15-second energization and 0.1-second stop of energization” twice in the ion-containing aqueous solution at a current density of 10 A / dm2.

TABLE 1Step of forming a laverAmount coatedon surface-Step of adjusting the surfacetreated sheetTreatment with ion-contain...

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Abstract

Provided is a surface-treated steel sheet with a compound layer containing F and composed essentially or Zr at least on one surface thereof, wherein the Zr amount is 80 to 350 mg / m2 and the F amount is 0.5 to 10 mg / m2 within the layer, and an organic resin coated metal container manufactured using the surface-treated steel sheet. The surface-treated steel sheet of the present invention is manufactured through forming a layer having the Zr amount of 80 to 350 mg / m2 at least on one surface of a steel sheet by cathode electrolytic treatment in an aqueous solution containing a Zr ion and F ion, and subsequently adjusting the surface to control the F amount to 0.5 to 10 mg / m2 by one or more treatments selected from immersion and spraying with an ion-containing aqueous solution and cathode electrolytic treatment in the ion-containing aqueous solution.

Description

BACKGROUND OF THE INVENTION[0001]1. Technical Field of the Invention[0002]The present invention relates to a surface-treated steel sheet, an organic resin coated metal container, and a method for producing the surface-treated steel sheet.[0003]2. Description of the Related Art[0004]In the fields of home electric appliances, building materials, vehicles, aircrafts, and containers, etc., chromate treatment is conventionally known as the treatment to improve adhesiveness between a steel sheet and organic coating. For its excellent corrosion resistance and adhesiveness, the chromate treatment has been widely used. There are two types to the chromate treatment: the first type includes hexavalent chromium within a layer and the second type does not include hexavalent chromium. In recent years, from the viewpoints of environment and occupational health, there is a growing trend to prohibit inclusion of hexavalent chromium even in starting materials themselves regardless of the state of the...

Claims

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Application Information

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IPC IPC(8): C25D7/00C25D9/10C25D21/12C25D3/54
CPCC25D9/10C25D21/12C25D7/00C25D3/54
Inventor YOSHIMURA, KUNIHIROTAGUCHI, NAOMIFUKUTOMI, SATOKOKUROKAWA, WATARUHIROTSU, MUNEMITSUAIHARA, MITSUHIDEMIKAMI, SATOSHI
Owner TOYO KOHAN CO LTD
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