JP2013249513A - Surface-treated steel sheet for battery container and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface-treated steel sheet for a battery container, which is improved in the adhesion between a nickel-plated steel sheet and a resin coating formed on the nickel-plated steel sheet, and which prevents direct contact between a mold used for DI processing and the nickel-plated steel sheet by the coating covering the surface of the nickel-plated steel sheet, and thereby reduces the wear of the mold and can prolong the life of the mold.SOLUTION: A surface-treated steel sheet for a battery container is obtained by forming a resin coating film on a nickel-plated steel sheet subjected to an electrolytic degreasing treatment.

Description

  The present invention relates to a surface-treated steel sheet for battery containers and a method for producing the same.

  In recent years, portable devices such as audio devices and mobile phones have been used in various fields, and the primary power source is alkaline batteries as primary batteries, nickel-hydrogen batteries as secondary batteries, nickel-cadmium batteries, lithium-ion batteries, etc. Has been. These batteries are required to have high performance such as high output and long life, and battery containers filled with power generation elements composed of a positive electrode active material, a negative electrode active material, and the like are also important battery components. In order to improve performance, processing such as deep drawing and drawing and ironing (DI processing) is performed to form a shape suitable for the application.

  As such a battery container material, for example, Patent Document 1 discloses a resin-coated steel sheet in which a film made of a polyolefin resin is formed on a nickel-plated steel sheet.

JP 2007-227339 A

  However, in the resin-coated steel sheet disclosed in Patent Document 1, the adhesion between the nickel-plated steel sheet and the film made of polyolefin resin is low, and when performing DI processing, the film made of polyolefin resin is scraped or cracked. In some cases, the nickel plating layer exposed thereby and the die for DI processing come into direct contact with each other, thereby causing a problem that the die is worn.

  An object of the present invention is to improve the adhesion between a nickel-plated steel sheet and a film made of a resin formed on the nickel-plated steel sheet, and to provide a mold for use in DI processing with a film covering the surface of the nickel-plated steel sheet. It is intended to provide a surface-treated steel sheet for a battery container that prevents direct contact with a nickel-plated steel sheet, thereby reducing the wear of the mold and extending the life of the mold. Another object of the present invention is to provide a battery container and a battery obtained by using such a surface-treated steel sheet for battery containers.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors have obtained the above-mentioned surface-treated steel sheet for battery containers by forming a coating film made of resin on the surface of a nickel-plated steel sheet that has been subjected to electrolytic degreasing. The inventors have found that the object can be achieved and have completed the present invention.

  That is, according to the present invention, there is provided a surface-treated steel sheet for battery containers, wherein a coating film made of a resin is formed on a nickel-plated steel sheet that has been subjected to electrolytic degreasing.

  In the surface-treated steel sheet for battery containers of the present invention, preferably, the peak in the energy range of 849 to 859 eV, measured by X-ray photoelectron spectroscopy (ESCA), on the surface of the nickel-plated steel sheet that has been subjected to electrolytic degreasing. Of the peak value in the energy range of 280 to 292 eV is 1.0 or more.

According to this invention, the battery container formed by shape | molding one of the said surface-treated steel sheets for battery containers is provided.
Moreover, according to this invention, the battery which uses the said battery container is provided.

  Furthermore, according to this invention, it has the process of performing the electrolytic degreasing process on the surface of a nickel plating steel plate, and the process of forming the coating film which consists of resin on the said nickel plating steel plate in which the electrolytic degreasing process was performed. The manufacturing method of the surface-treated steel sheet for battery containers characterized by this is provided.

  In the production method of the present invention, preferably, 280 of the integral value of the peak in the energy range of 849 to 859 eV measured by X-ray photoelectron spectroscopy (ESCA) on the surface of the nickel-plated steel sheet subjected to electrolytic degreasing treatment. The ratio of the peak to the integral value in the energy range of ˜292 eV is 1.0 or more.

  According to the present invention, the adhesion between the nickel-plated steel sheet and the coating film made of the resin on the nickel-plated steel sheet is high, and when the battery container is formed by DI processing, the wear of the mold can be reduced, Thereby, the surface-treated steel sheet for battery containers which makes it possible to extend the life of the mold can be provided.

FIG. 1 is a diagram showing the results of measuring the surface of a nickel-plated steel sheet subjected to anodic electrolytic degreasing in Example 1 by ESCA. FIG. 2 is a diagram showing the results of measuring the surface of a nickel-plated steel sheet subjected to cathodic electrolytic degreasing in Example 2 by ESCA. FIG. 3 is a diagram showing the results of measurement by ESCA on the surface of the nickel-plated steel sheet that was wiped with MEK in Comparative Example 1. FIG. 4 is a diagram showing the results of measurement by ESCA on the surface of a nickel-plated steel sheet not subjected to degreasing treatment in Comparative Example 2.

Hereinafter, the surface-treated steel sheet for battery containers according to the present invention will be described.
The surface-treated steel sheet for battery containers according to the present invention is characterized in that a coating film made of a resin is formed on a nickel-plated steel sheet that has been subjected to electrolytic degreasing.

<Nickel plated steel plate>
The original plate of the nickel-plated steel sheet used as the substrate for the surface-treated steel sheet for battery containers of the present invention is not particularly limited as long as it has excellent workability in deep drawing and drawing and ironing (DI processing). For example, Ti or Nb is further added to low carbon aluminum killed steel (carbon content 0.01 to 0.15 wt%), ultra low carbon steel having a carbon content of 0.003 wt% or less, or ultra low carbon steel. It is possible to use non-aging ultra-low carbon steel.

  In the present invention, these steel hot-rolled plates are pickled to remove the surface scale (oxide film), then cold-rolled, then electrolytically washed with rolling oil, and then annealed and temper-rolled. A thing is used as an original plate. In this case, the annealing may be either continuous annealing or box annealing, and is not particularly limited.

  And the nickel plating steel plate of this invention is formed by giving nickel plating to said original plate. The nickel plating layer formed on the original plate may be provided on at least the surface serving as the battery container inner surface of the original plate, but may be formed on the surface serving as the battery container outer surface in addition to the surface serving as the battery container inner surface. Good. Further, the nickel plating layer formed on the original plate may be formed using not only pure Ni but also an alloy containing Ni, such as a Ni—Co alloy or an Fe—Ni alloy. .

  The thickness of the nickel plating layer in the nickel-plated steel sheet is preferably 0.5 to 10 μm, more preferably 1.0 to 5.0 μm.

<Coating film>
A coating film is formed by apply | coating resin on a nickel plating steel plate. As the resin for forming the coating film, for example, a polyester resin, a polyolefin resin, a polyether sulfone resin, or the like can be used, and among these, a polyester resin is preferable from the viewpoint of processing followability. Although it does not specifically limit as a polyester resin, For example, a polyester resin, a urethane modified polyester resin, an acrylic modified polyester resin, an epoxy modified polyester resin etc. can be used. The coating film is a layer for preventing direct contact between the die used for DI processing and the nickel-plated steel sheet when the battery container is formed by DI processing. By forming the coating film, The wear of the mold can be reduced and the life of the mold can be extended.

  In the present invention, the nickel-plated steel sheet for forming such a coating film removes a carbon-containing compound that is a factor that inhibits adhesion to the coating film on the nickel-plated layer on the nickel-plated steel sheet. Degreasing treatment is performed.

  In the present invention, when a coating film made of a resin is formed on a nickel-plated steel sheet, electrolytic degreasing is performed on the nickel plating layer for forming the coating film, and the electrolytic plating degreasing is performed on the nickel plating layer. Since the coating film which consists of is formed, the adhesiveness of a nickel plating steel plate and the coating film which consists of resin can be made high. And according to the surface-treated steel sheet for battery containers of the present invention, since the adhesion between the nickel plating layer and the coating film is high, when manufacturing the battery container using the surface-treated steel sheet for battery containers of the present invention, DI It is possible to effectively prevent the coating film from being scraped or cracked during processing.

  On the other hand, as in the technique of Patent Document 1 (Japanese Patent Laid-Open No. 2007-227339) described above, for a battery container in which a coating made of a polyolefin resin is formed on a nickel-plated steel sheet without subjecting the nickel-plated steel sheet to electrolytic degreasing. When forming a battery container by DI processing using a surface-treated steel plate, the adhesion between the nickel-plated steel plate and the film made of polyolefin resin is low, and when DI processing is performed, the film is made of a polyolefin resin. In some cases, the exposed nickel plating layer and the DI processing mold are in direct contact with each other, causing the mold to wear and shortening the life of the mold. . On the other hand, according to the surface-treated steel sheet for battery containers of the present invention, since the adhesion between the nickel plating layer and the coating film is high, the coating film may be scraped or cracked during DI processing. As a result, the nickel plating layer can be prevented from coming into direct contact with the die for DI processing during DI processing, thereby preventing wear of the die. This can reduce the life of the mold.

  In the present invention, the surface of the electrolytically degreased nickel-plated steel sheet has an energy range of 280 to 292 eV, which is an integral value of a peak in the energy range of 849 to 859 eV when measured by X-ray photoelectron spectroscopy (ESCA). The ratio of the peak to the integral value (“peak integral value in the energy range of 849 to 859 eV” / “peak integral value in the energy range of 280 to 292 eV”) is preferably 1.0 or more, and more preferably Is 1.5 or more, more preferably 2.0 or more.

Here, when measuring the surface of the nickel-plated steel sheet by ESCA, the peak in the energy range of 849 to 859 eV is usually derived from nickel-containing compounds such as pure Ni, Ni oxide, Ni hydroxide, The peak in the energy range of 280 to 292 eV is usually derived from a carbon-containing compound such as C, Na ₂ CO ₃ , and CaCO ₃ .

  In the present invention, the value of “integral value of peak in the energy range of 849 to 859 eV” / “integral value of peak in the energy range of 280 to 292 eV” measured by ESCA on the surface of the nickel-plated steel sheet subjected to electrolytic degreasing. By controlling to the above range, the adhesion between the nickel-plated steel sheet and the coating film formed on the nickel-plated steel sheet can be further improved. In particular, the present inventors have focused on the carbon-containing compound attached to the nickel plating layer, and as a result, have found that the carbon-containing compound inhibits adhesion with a coating film made of a resin. It has been found that the adhesion of the coating film formed on the nickel-plated steel sheet is further improved by removing it by electrolytic degreasing. Therefore, according to the present invention, by reducing the carbon-containing compound adhering to the surface of the nickel-plated steel sheet (that is, “the integrated value of the peak in the energy range of 849 to 859 eV” / “the peak in the energy range of 280 to 292 eV). By increasing the value of “integral value of”, the adhesion between the nickel-plated steel sheet and the coating film formed on the nickel-plated steel sheet can be further improved. On the other hand, if the value of “integral value of peak in energy range of 849 to 859 eV” / “integral value of peak in energy range of 280 to 292 eV” on the surface of nickel plated steel sheet is too low, carbon content on the nickel plated steel sheet When the content ratio of the compound becomes too large, the adhesion between the nickel-plated steel sheet and the coating film made of resin decreases, and the coating film peels off when a load is applied due to DI processing, etc. There is.

<Method for producing surface-treated steel sheet for battery container>
Subsequently, the manufacturing method of the surface-treated steel sheet for battery containers of this invention is demonstrated.

  First, an original plate for constituting a nickel-plated steel plate is prepared, and nickel plating is formed on the original plate to form a nickel-plated steel plate. In this case, the nickel plating may be formed by using any plating method such as electroplating or electroless plating. The nickel plating layer formed on the original plate may be provided on at least the surface serving as the battery container inner surface of the original plate, but may be formed on the surface serving as the battery container outer surface in addition to the surface serving as the battery container inner surface. Good.

  Next, electrolytic degreasing treatment is performed on the nickel plating layer on the nickel-plated steel sheet. The method of electrolytic degreasing is not particularly limited, and for example, a method such as anodic electrolytic degreasing, cathodic electrolytic degreasing, or PR electrolytic degreasing can be used.

According to anodic electrolytic degreasing (anodic electrolytic degreasing), in an alkaline cleaning solution, a nickel-plated steel plate is used as an anode (a nickel-plated steel plate is used as an oxidation electrode (electrode where electrons are extracted)), and the generated oxygen is The surface of the nickel-plated steel sheet can be degreased by the bubbles. The conditions for the anodic electrolytic degreasing are that the current density is preferably 9.0 to 15.0 A / dm ² , more preferably 9.5 to 12.0 A / dm ² . The energization time is preferably 6.0 to 20.0 seconds, and more preferably 6.5 to 10.0 seconds. Furthermore, the bath temperature of the alkaline cleaning liquid is preferably 55 to 65 ° C, more preferably 57 to 63 ° C. In the present invention, the surface of the nickel-plated steel sheet is appropriately degreased by setting the current density, the energization time, and the bath temperature of the alkaline cleaning liquid within the above ranges, and the coating film made of resin is adhered to the nickel-plated steel sheet. be able to.

According to cathodic electrolytic degreasing (cathodic electrolytic degreasing), in an alkaline cleaning solution, a nickel-plated steel plate is used as a cathode (a nickel-plated steel plate is used as a reducing electrode (electrode to which electrons are supplied)), and hydrogen bubbles are generated. Thus, the surface of the nickel-plated steel sheet can be degreased. The conditions for the anodic electrolytic degreasing are that the current density is preferably 9.0 to 15.0 A / dm ² , more preferably 9.5 to 12.0 A / dm ² . The energization time is preferably 6.0 to 20.0 seconds, and more preferably 6.5 to 10.0 seconds. Furthermore, the bath temperature of the alkaline cleaning liquid is preferably 55 to 65 ° C, more preferably 57 to 63 ° C. In the present invention, the surface of the nickel-plated steel sheet is appropriately degreased by setting the current density, the energization time, and the bath temperature of the alkaline cleaning liquid within the above ranges, and the coating film made of resin is adhered to the nickel-plated steel sheet. be able to.

  Moreover, in this invention, you may perform PR electrolytic degreasing which implements the anodic electrolytic degreasing and cathode electrolytic degreasing which were mentioned above alternately. That is, the PR electrolytic degreasing is a method in which the polarity of the nickel-plated steel sheet is alternately switched between the anode and the cathode in the alkaline cleaning liquid, and the surface of the nickel-plated steel sheet is degreased by the generated oxygen or hydrogen bubbles. In addition, the conditions of the current density, the energization time, and the bath temperature of the alkaline cleaning liquid in performing PR electrolytic degreasing may be the same as the conditions in performing the above anodic electrolytic degreasing and cathodic electrolytic degreasing.

  The alkali salt used in the above alkaline cleaning liquid is not particularly limited, but sodium hydroxide (caustic soda), sodium carbonate, sodium phosphate, etc. may be used alone or in combination of two or more. it can. Moreover, you may add a builder (auxiliary agent), surfactant, etc. to an alkali washing | cleaning liquid as needed.

  In the present invention, the surface of the electrolytically degreased nickel-plated steel sheet is 280 to 292 eV of the integrated value of the peak in the energy range of 849 to 859 eV when the surface is measured by X-ray photoelectron spectroscopy (ESCA). The ratio of the peak in the energy range to the integrated value of the peak (“integrated value of the peak in the energy range of 849 to 859 eV” / “integrated value of the peak in the energy range of 280 to 292 eV”) is preferably 1.0 or more. More preferably, it is 1.5 or more, More preferably, it is 2.0 or more. The coating film formed on the nickel-plated steel sheet when the value of “integral value of peak in energy range of 849 to 859 eV” / “integral value of peak in energy range of 280 to 292 eV” is within the above range. It is possible to effectively remove the carbon-containing compound that becomes a factor that inhibits the adhesion of the steel, and the adhesion between the nickel-plated steel sheet and the coating film formed on the nickel-plated steel sheet is further improved.

  In the present invention, as a method of setting the value of “integral value of peak in energy range of 849 to 859 eV” / “integral value of peak in energy range of 280 to 292 eV” on the surface of the nickel-plated steel sheet as the above range. Although not particularly limited, for example, a method of controlling the conditions of current density, energization time, and bath temperature of the alkaline cleaning liquid when electrolytic degreasing is performed on a nickel plating layer on a nickel-plated steel sheet within the above-described range, etc. Is mentioned.

Examples of the carbon-containing compound that is a factor that inhibits adhesion of the coating film include C, Na ₂ CO ₃ , and CaCO ₃ , and these include, for example, wax, work oil, processing oil, molding oil, Industrial oils such as mineral oils (paraffinic and naphthenic), oils and fats attached during work by humans such as sebum and fingerprints, dust from clothes, bedding and carpets made from silk, etc. Possible components include dandruff, dirt, dust caused by ticks and dead microorganisms. In the present invention, these components can be effectively removed by subjecting the nickel plating layer on the nickel-plated steel sheet to electrolytic degreasing treatment.

  Next, a coating film is formed by applying a resin on the electrolytically degreased nickel-plated steel sheet. The method for applying the resin on the nickel-plated steel sheet is not particularly limited. For example, there is a method in which the resin is dissolved in a solvent to obtain a resin solution, and the resulting resin solution is applied onto the nickel-plated steel sheet by spin coating. Can be mentioned. The nickel plating layer has been subjected to electrolytic degreasing, and therefore, the carbon-containing compound on the nickel plating layer has been effectively removed by electrolytic degreasing. The adhesiveness with the nickel plating layer can be high. In this invention, the surface-treated steel sheet for battery containers which formed the coating film which consists of resin on the nickel plating steel plate electrolytically degreased in this way is obtained. In addition, as resin for forming a coating film, a polyester resin, polyolefin resin, polyether sulfone resin etc. can be used as mentioned above, for example.

  The thickness of the coating film made of resin is preferably 3 to 50 μm, more preferably 3 to 30 μm. By setting the thickness of the coating film within the above range, the coating film is well formed so as to cover the surface of the nickel-plated steel sheet that has been subjected to electrolytic degreasing treatment, and thus the adhesion between the nickel-plated steel sheet and the coating film In addition, when the battery container is formed by DI processing, it is possible to prevent the mold used for DI processing from directly contacting the nickel-plated steel sheet, thereby reducing the wear of the mold. In addition, it is possible to extend the life of the mold. When the thickness of the coating film is less than 3 μm, the coating film is scraped or cracked when performing DI processing, and the die used for DI processing and the nickel-plated steel sheet are in direct contact with each other, The effect of reducing mold wear tends to be reduced. On the other hand, if the thickness of the coating film is larger than 50 μm, the effect of reducing the wear of the mold is saturated, which is disadvantageous in terms of cost.

<Battery container>
The battery container of this invention is obtained by shape | molding the surface-treated steel sheet for battery containers of this invention mentioned above in the shape of the battery which requires.

  Since the battery container of the present invention is formed using the above-described surface-treated steel sheet for battery containers of the present invention, the adhesion between the nickel-plated steel sheet and the coating film is high, and the mold used for DI processing is used. Long life and excellent mass production processability, so it is suitable as a battery container for batteries used in various fields such as alkaline batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lithium ion batteries, etc. Can be used.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

<Example 1>
A steel plate obtained by annealing a cold rolled plate (thickness 0.35 mm) of low-carbon aluminum killed steel having the chemical composition shown below was prepared as the original plate.
C: 0.045% by weight, Mn: 0.23% by weight, Si: 0.02% by weight, P: 0.012% by weight, S: 0.009% by weight, balance: Fe and inevitable impurities

And about the prepared steel plate, after performing electrolytic degreasing and pickling of sulfuric acid immersion, nickel plating was performed on the following conditions, and a nickel plating steel plate was obtained by forming a nickel plating layer with a thickness of 2.5 μm . The nickel plating conditions were as follows.
Bath composition: nickel sulfate, nickel chloride, boric acid, semi-bright additive (NSAP, SB-71, SB-72)
pH: 4.0-4.6
Bath temperature: 55 ° C
Current density: 25-30 A / dm ²

Next, with respect to the nickel-plated steel plate thus obtained, an alkaline cleaning solution (with respect to 75% by weight of caustic soda, a balance consisting of a builder (auxiliary agent) and a nonionic surfactant at a rate of 30 g / L) In a dissolved aqueous solution, manufactured by Nippon Quaker Chemical Co., Ltd., product number: Quaker Formula 618-TK-2), anodic electrolytic degreasing was performed under the following conditions using a nickel-plated steel plate as an anode.
Bath temperature: 60 ° C
Current density: 10 A / dm ²
Energizing time: 7 seconds

Measurement by ESCA and the surface of the obtained nickel-plated steel sheet, by ESCA (manufactured by JEOL Ltd., model number: JPS-9200), Dwell (integrated time for each measurement): 100 ms, Pass (analyzer path energy): The peak of the nickel-containing compound (Ni orbital: 2p _3/2 ) and the carbon-containing compound (C orbital: 1 s) was measured under the condition of 50 eV. The obtained measurement patterns are shown in FIGS. 1 (A) and 1 (B).

  And based on the measurement pattern shown in FIG. 1 (A) and FIG. 1 (B) obtained, the integrated value of the peak in the energy range of 849-859 eV by the nickel-containing compound, and the energy of 280-292 eV by the carbon-containing compound The integrated value of the peak in the range was calculated. Next, based on the calculated integrated value, a value of “integrated value of peak in energy range of 849 to 859 eV” / “integrated value of peak in energy range of 280 to 292 eV” was obtained. The results are shown in Table 1.

  Next, a resin solution (byron UR-, manufactured by Toyobo Co., Ltd.) obtained by dissolving a urethane-modified copolymer polyester resin in a solvent (methyl ethyl ketone: toluene = 50: 50 (% by weight)) on a nickel-plated steel sheet subjected to anodic electrolytic degreasing. 4800) was applied by spin coating and then dried in an oven at 120 ° C. for 3 minutes to form a coating film having a thickness of 3 μm to obtain a surface-treated steel sheet for battery containers.

Evaluation of film peelability And the surface-treated steel sheet for battery containers thus obtained was evaluated for film peelability according to the following method. Specifically, the evaluation of the peelability of the coating film is carried out using a cutter knife on the coating film with a 2 mm spacing for an area of 20 mm × 20 mm until a nickel-plated steel sheet is reached, and an adhesive tape After carrying out a peeling test on the cross-cut coating film using the film, the peeling state of the coating film was observed and evaluated according to the following criteria. The evaluation results are shown in Table 1.
○: No peeling of the coating film was confirmed.
X: Peeling of the coating film occurred.

Evaluation of DI processability Next, DI processability was evaluated according to the following method. Specifically, the DI workability was evaluated by forming the surface-treated steel sheet for battery containers into a cylindrical battery container by DI processing, and then exposing the nickel-plated steel sheet due to scraping or cracking of the coating film. Whether or not it was observed was evaluated according to the following criteria. The evaluation results are shown in Table 1.
○: Exposure of the nickel-plated steel sheet was not confirmed.
X: Nickel-plated steel sheet was exposed.

<Example 2>
The surface for a battery container was the same as in Example 1 except that the nickel-plated steel sheet was subjected to cathodic electrolytic degreasing under the following conditions using the nickel-plated steel sheet as a cathode in the same alkaline cleaning solution as in Example 1. A treated steel plate was obtained and evaluated in the same manner. 2A and 2B show the measurement results by ESCA on the surface of the nickel-plated steel sheet subjected to cathodic electrolytic degreasing, and Table 1 shows the evaluation results.
Bath temperature: 60 ° C
Current density: 10 A / dm ²
Energizing time: 7 seconds

<Comparative Example 1>
A surface-treated steel sheet for battery containers was obtained in the same manner as in Example 1 except that anodic electrolytic degreasing was not performed on the nickel-plated steel sheet, and evaluation was performed in the same manner. 3A and 3B show the measurement results by ESCA on the surface of the nickel-plated steel sheet, and Table 1 shows the evaluation results.

<Comparative example 2>
A surface-treated steel sheet for battery containers was obtained in the same manner as in Example 1 except that the nickel-plated steel sheet was degreased by wiping the surface of the nickel-plated steel sheet with MEK (methyl ethyl ketone) instead of anodic electrolytic degreasing. The same evaluation was performed. FIG. 4A and FIG. 4B show the measurement results by ESCA on the surface of the nickel-plated steel sheet wiped with MEK, and Table 1 shows the evaluation results.

  As shown in Table 1, the anodic electrolytic degreasing treatment or the cathodic electrolytic degreasing treatment was applied to the nickel-plated steel sheet, and “the integrated value of the peak in the energy range of 849 to 859 eV” / “the integrated value of the peak in the energy range of 280 to 292 eV”. In Examples 1 and 2 in which the value of "" was 1.0 or more, the coating film was not peeled off, and the exposure of the nickel-plated steel sheet by DI processing was not confirmed.

  On the other hand, in Comparative Examples 1 and 2 in which the nickel-plated steel sheet is not subjected to electrolytic treatment, the value of “peak integrated value in the energy range of 849 to 859 eV” / “peak integrated value in the energy range of 280 to 292 eV” is In both cases, in the evaluation of the coating film peelability, peeling of the coating film occurred and the nickel-plated steel sheet was exposed.

Claims (6)

  A surface-treated steel sheet for battery containers, wherein a coating film made of a resin is formed on a nickel-plated steel sheet that has been subjected to electrolytic degreasing.   The integral of the peak in the energy range of 849-859 eV, measured by X-ray photoelectron spectroscopy (ESCA), on the surface of the nickel-plated steel sheet subjected to electrolytic degreasing treatment, is integrated in the energy range of 280-292 eV. 2. The surface-treated steel sheet for battery containers according to claim 1, wherein the ratio to the value is 1.0 or more.   The battery container formed by shape | molding the surface-treated steel sheet for battery containers of Claim 1 or 2.   A battery comprising the battery container according to claim 3. A process of performing electrolytic degreasing on the surface of the nickel-plated steel sheet;
Forming a coating film made of a resin on the nickel-plated steel sheet that has been subjected to electrolytic degreasing. A method for producing a surface-treated steel sheet for battery containers, comprising:   The integrated value of the peak in the energy range of 849 to 859 eV and the integrated value of the peak in the energy range of 280 to 292 eV, as measured by X-ray photoelectron spectroscopy (ESCA), on the surface of the nickel-plated steel sheet subjected to electrolytic degreasing. The method for producing a surface-treated steel sheet for a battery container according to claim 5, wherein the ratio to is not less than 1.0.

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