KR20160023822A - Steel sheet for container - Google Patents

Abstract

A steel sheet for a container excellent in resin adhesion and corrosion resistance is provided. The steel sheet for a container has a plated steel sheet having a plated layer containing a Sn layer covering at least a part of the surface of the steel sheet and a coating disposed on a surface of the plated steel sheet on the plated layer side, Wherein the coating amount of the coated steel sheet in terms of Zr is 1 to 40 mg / m 2 per one side of the coated steel sheet, and the coating amount of the coated steel sheet in terms of Ti per one side is more than 0.5 mg / / M < 2 >, and the coated amount of the plated steel sheet in terms of Si per one side is 1 to 40 mg / m < 2 >.

Description

{STEEL SHEET FOR CONTAINER}

The present invention relates to a steel sheet for containers.

2. Description of the Related Art Sn-coated steel sheets, which are conventionally referred to as " cans ", have been widely used as steel sheets for containers (canned surface treated steel sheets). In such a Sn-plated steel sheet, a chromate film is usually formed on the Sn-plated surface by immersing the steel sheet in an aqueous solution containing a hexavalent chromium compound such as dichromic acid or by performing a chromate treatment such as electrolytic treatment in this solution.

However, on the basis of the environmental problems of the past, the use of Cr has been regulated in various fields, and some techniques for replacing the chromate treatment have also been proposed in steel sheets for containers.

[0013] For example, Patent Document 1 discloses that "it is preferable to use a coating film containing Zr and O on at least one side of a metal plate" Coated steel sheet "(hereinafter, referred to as" claim 1 "), wherein the" metal plate "is an" electrical Sn-coated steel plate "(claim 3).

Japanese Patent Application Laid-Open No. 2008-184630

In recent years, as the demand for aesthetics of consumers has increased, further improvement in various properties required for a steel sheet for a container has been demanded.

The present inventors further studied the steel plate for a container (surface-treated metal plate) disclosed in Patent Document 1. As a result, it has been found that when the resin such as the PET film is subjected to the retort processing after laminating, the adhesion to the resin film (hereinafter also referred to as " resin adhesion property ") may become insufficient.

Further, the inventors of the present invention have found that, when a coating film made of an epoxy phenolic coating material is formed on a steel sheet for a container and then immersed in tomato juice under a predetermined condition, the coating film may peel off or rust, resulting in poor corrosion resistance.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a steel sheet for a container excellent in resin adhesion and corrosion resistance.

The inventors of the present invention have conducted intensive studies in order to achieve the above object. As a result, they found that the coating of a steel sheet for a container contains a specific amount of a specific component, thereby improving both resin adhesion and corrosion resistance.

That is, the present invention provides the following (1) to (4).

(1) A coated steel sheet having a plated layer containing a Sn layer covering at least a part of a surface of a steel sheet, and a coating disposed on a surface of the plated steel sheet on the plated layer side, wherein the coating contains Zr, Ti Wherein the coating amount of the coated steel sheet is 1 to 40 mg / m 2 in terms of Zr per one side of the coated steel sheet, and the coating amount of the coated steel sheet in terms of Ti per one side is less than 10 mg / , And the amount of adhesion of the plated steel sheet in terms of Si per one side is 1 to 40 mg / m 2.

(2) The steel sheet for containers according to the above (1), wherein the coating has an adhesion amount of less than 3 mg / m 2 and less than 10 mg / m 2 per one side of the coated steel sheet in terms of Ti.

(3) the atomic ratio (Ti / Zr) between Ti and Zr on the outermost surface of the coating film opposite to the coated steel sheet side is 0.05 to 2.0, and the atomic ratio (Si / Zr) The steel sheet for containers according to the above (1) or (2), which is 0.1 to 3.0.

(4) The plating method according to any one of (1) to (4), wherein the plating layer further comprises at least one layer selected from the group consisting of a Ni layer, a Ni-Fe alloy layer, a Fe- (3) above.

According to the present invention, it is possible to provide a steel sheet for a container excellent in resin adhesion and corrosion resistance.

Figure 1 is a schematic diagram illustrating a 180 degree peel test.

(Mode for carrying out the invention)

[Steel for Container]

The steel sheet for a container of the present invention has a coated steel sheet and a coating disposed on the surface of the coated steel sheet on the coating layer side. Further, this coating contains Zr and Ti in a specific amount and further contains silica in a specific amount, so that the resin adhesion and corrosion resistance are excellent.

Hereinafter, concrete embodiments of the coated steel sheet and the coating film will be described in detail. First, an embodiment of a plated steel sheet will be described in detail.

<Plated steel plate>

The plated steel sheet has a steel sheet and a plated layer covering at least a part of the surface of the steel sheet, and the plated layer includes at least a Sn layer. Hereinafter, embodiments of the steel sheet and the plating layer will be described in detail.

(Steel plate)

The kind of the steel sheet is not particularly limited, and a steel sheet (for example, a low carbon steel sheet or an extremely low carbon steel sheet) used as a container material can be used. The manufacturing method and materials of the steel sheet are not particularly restricted, and they are manufactured through a process such as hot rolling, pickling, cold rolling, annealing, temper rolling,

The steel sheet may be prepared by forming a nickel (Ni) -containing layer on its surface, if necessary, and forming a plating layer containing a Sn layer to be described later on the Ni-containing layer. By performing the Sn plating using the steel sheet having the Ni-containing layer, a plating layer containing the island-like Sn can be formed, and the weldability is improved.

The Ni-containing layer may contain nickel, and examples thereof include a Ni-plated layer and a Ni-Fe alloy layer.

The method of applying the Ni-containing layer to the steel sheet is not particularly limited, and for example, a known method such as electroplating may be used. When a Ni-Fe alloy layer is provided as the Ni-containing layer, the Ni-Fe alloy layer can be formed by aligning the Ni diffusion layer by applying Ni to the surface of the steel sheet by electroplating or the like and then annealing.

The amount of Ni in the Ni-containing layer is not particularly limited, and is preferably 50 to 2000 mg / m 2 in terms of Ni converted amount per one side. Within the above range, it is advantageous in terms of cost.

(Plating layer)

The plated steel sheet has a plated layer containing an Sn layer on at least a part of the surface of the steel sheet. The plating layer may be formed on at least one surface of the steel sheet, or may be formed on both surfaces.

The Sn adhesion amount per one surface of the plated steel sheet of the plated layer is preferably 0.1 to 15.0 g / m 2. When the Sn adhesion amount is within the above range, the corrosion resistance of the steel sheet for containers is more excellent, more preferably from 1.0 to 15.0 g / m 2 from the viewpoints of 0.2 to 15.0 g / m 2 being preferable and excellent workability.

The amount of Sn deposited can be measured by surface method using the whole-volume method or fluorescent X-ray. In the case of X-ray fluorescence, a Sn concentration amount sample is used to determine the amount of Sn, and the amount of Sn relative to the amount of Sn is determined using the same calibration curve.

The plating layer is a layer covering at least a part of the surface of the steel sheet, and may be a continuous layer or a discontinuous island shape.

As the plating layer, a plating layer formed by partially plating an Fe-Sn alloy layer on the lowermost layer (Sn layer / steel sheet interface) of the Sn layer obtained by heating and melting Sn by Sn heating after electroless plating after Sn plating, .

As the plating layer, Sn plating is performed on the steel sheet having the Ni-containing layer on its surface, and the tin is further heated and melted by energization heating or the like to form the Fe-Sn-Ni alloy layer (Sn layer / steel sheet interface) , A Fe-Sn alloy layer, and the like.

Further, in the present invention, the Ni-containing layer (Ni layer, Ni-Fe alloy layer) described above is also included in the plating layer of the coated steel sheet.

As a method for producing the plating layer, a well-known method (for example, an electroplating method or a method of dipping in molten Sn and plating) can be given.

For example, the surface of the steel sheet may be coated with Sn by using a phenol sulfonic acid Sn plating bath, a methanesulfonate Sn plating bath, or a halogen Sn plating bath so that the adhesion amount per one surface becomes a predetermined amount (for example, 2.8 g / After the plating, a heating and melting treatment is performed at a temperature higher than the melting point (231.9 ° C) of Sn to prepare a plating layer in which an Fe-Sn alloy layer is formed on the lowest layer (Sn layer / steel sheet interface) of the plating layer (Sn layer) . In the case where the heating and melting treatment is omitted, a plating layer (Sn layer) of single Sn can be produced.

When the steel sheet has a Ni-containing layer on its surface, if the Ni-containing layer is Sn-plated and subjected to a heating and melting treatment, the Fe-Sn- Ni alloy layer, an Fe-Sn alloy layer, and the like are formed.

<Coating>

The coating film is disposed on the surface of the plated steel sheet on the plated layer side.

The coating contains, as its components, Zr, Ti and silica. First, each component will be described in detail below, and then the method for forming the coating film will be described in detail.

(Zr, Ti and Si)

The coating contains Zr (zirconium element), and the coating amount of the coated steel sheet in terms of Zr per one side (hereinafter also referred to as &quot; Zr coating amount &quot;) is 1 to 40 g / m 2. When the Zr adhesion amount is within the above range, the steel sheet for containers has excellent resin adhesion and corrosion resistance. Among them, 1 to 25 mg / m &lt; 2 &gt; is preferable for the reason that the cost performance is excellent.

If the amount of Zr is less than 1 mg / m 2, the resin adhesion and corrosion resistance are poor. Even if the Zr deposition amount exceeds 40.0 mg / m &lt; 2 &gt;, there is no problem in terms of performance, but this leads to an increase in the cost of the treatment liquid for ensuring the deposition amount and an increase in the cost due to the high current density.

The coating contains Ti (titanium element), and the coating amount of the plated steel sheet in terms of Ti per one side (hereinafter also referred to as "Ti coating amount") is less than 10 mg / m 2 and less than 10 mg / m 2. When the Ti adhesion amount is within the above range, the resin adhesion of the steel sheet for containers is excellent. Further, from the viewpoint of more excellent resin adhesion, it is preferable that it is more than 3 mg / m 2 but less than 10 mg / m 2.

When the Ti adhesion amount is 0.5 mg / m 2 or less, the resin adhesion is poor. Even if the Ti adhesion amount is 10 mg / m &lt; 2 &gt; or more, there is no problem in performance, but this leads to an increase in the treatment liquid cost for ensuring the adhesion amount and an increase in the cost due to the high current density.

Further, the coating contains silica. It is believed that the film contains silica to form a suitable concavo-convex shape in the film, and the resin adhesion of the steel sheet for containers is excellent.

The silica represented by the composition formula SiO ₂ has an irregular shape and a spherical shape, but the silica included in the coating is preferably spherical silica. It is considered that the spherical silica is contained in the film while maintaining the shape by using the colloidal silica in which the spherical silica is dispersed as the Si component in the treatment liquid to be described later. At this time, the silica contained in the coating film is spherical in shape, for example, by exposing the end face of the coating film by a converging ion beam (FIB) process and observing by a transmission electron microscope (TEM).

The coating film has an adhesion amount (hereinafter also referred to as &quot; Si adhesion amount &quot;) of 1 to 40 mg / m 2 of the silica in terms of Si (silicon element) per one side of the coated steel sheet. When the Si adhesion amount is within the above range, the resin adhesion is excellent. In addition, Si adhesion amount is preferably 1 to 25 mg / m &lt; 2 &gt; for the reason of excellent cost performance.

If the Si adherence amount is less than 1 mg / m 2, the resin adhesion is poor. When the Si adhesion amount exceeds 40 mg / m &lt; 2 &gt;, cohesive failure occurs in the coating film and the resin adhesion is lowered.

The above Zr deposition amount, Ti deposition amount and Si deposition amount can be measured by surface analysis by fluorescent X-ray.

The Zr in the coating film is included, for example, as a zirconium compound such as zirconium oxide, zirconium hydroxide, zirconium fluoride, zirconium phosphate, or a composite compound thereof. The Zr adhesion amount means the Zr reduced amount of these zirconium compounds.

Ti in the coating film is included as a titanium compound, for example, titanium phosphate, titanium hydroxides, or complex compounds thereof. The Ti adhesion amount means the Ti equivalent amount of these titanium compounds.

(Suitable embodiment of coating)

(Ti / Zr) between Ti and Zr in the outermost surface of the coating film (the outermost surface opposite to the coated steel sheet) is 0.05 to 2.0, and the atomic ratio of Si and Zr (Si / Zr) is 0.1 to 3.0. With this embodiment, the resin adhesion of the steel sheet for containers is more excellent.

Further, the atomic ratio is obtained by analyzing peaks of Zr3d, Ti2p and Si2p by X-ray photoelectron spectroscopy (XPS) analysis.

As the XPS analysis, for example, the following conditions may be mentioned.

Device: AXIS-HS manufactured by Shimadzu Corporation / KRATOS

X-ray source: monochromatic AlK? Line (hv = 1486.6 eV)

Measurement area: Hybrid mode 250 × 500 (㎛)

[Manufacturing method of steel sheet for container, treatment liquid]

The method for producing the above-described steel sheet for a container of the present invention is not particularly limited, but it is also possible to immerse the coated steel sheet in a treatment solution (hereinafter also referred to as &quot; treatment solution of the present invention &quot; (Hereinafter, also referred to as &quot; the production method of the present invention &quot;) by carrying out cathodic electrolytic treatment on the plated steel sheet immersed in the above-mentioned coating film.

Hereinafter, the manufacturing method of the present invention will be described, and the processing solution of the present invention will be described.

<Coating Formation Step>

The film forming step is a step of forming the above-described film on the surface of the plated steel sheet on the plated layer side, in which the plated steel sheet is immersed (immersed) in the treatment liquid of the present invention to be described later, . The negative electrode electrolytic treatment is preferable because a uniform film can be obtained at a higher speed than the immersion treatment. Alternatively, alternate electrolysis may be performed in which cathodic electrolytic treatment and anodic electrolytic treatment are alternately performed.

Hereinafter, the treatment liquid of the present invention used, the conditions of the negative electrode electrolytic treatment, and the like will be described in detail.

(The treatment liquid of the present invention)

The treatment liquid of the present invention contains a Zr component (Zr compound) as a Zr supply source for supplying Zr (zirconium element) to the coating film.

Examples of the Zr compound contained in the treatment liquid of the present invention include zirconium hexafluoride and / or its salt (for example, potassium, ammonium, etc.), zirconium oxyacetate, zirconium oxynitrate and the like. In addition, zirconium hexafluoride is also referred to as zirconium hydrofluoric acid. Zirconium oxyacetate [ZrO (CH ₃ COO) ₂ ] is also called zirconyl acetate. Zirconium oxynitrate [ZrO (NO ₃ ) ₂ ] is also called zirconyl nitrate.

The content of the Zr compound in the treatment liquid of the present invention is preferably 0.3 to 10.0 g / L, more preferably 0.5 to 4.0 g / L.

The treatment liquid of the present invention contains a Ti component (Ti compound) as a Ti source for supplying Ti (titanium element) to the coating.

Examples of the Ti compound contained in the treatment liquid of the present invention include titanium lactate, titanium hexafluorophosphate and / or a salt thereof (for example, potassium, ammonium and the like), titanium alkoxide, titanyl ammonium oxalate, titanyl oxalate Potassium dihydrate, titanium sulfate, and the like. Titanium lactate [Ti (OH) ₂ [OCH (CH ₃ ) COOH] ₂ ] is also called dihydroxybis (lactate) titanium. In the present invention, the ammonium salt (monoammonium salt and diammonium salt) . Titanium hexafluoro titanate is also referred to as titanium hydrofluoric acid.

The content of the Ti compound in the treatment liquid of the present invention is preferably 0.1 to 10 g / L, more preferably 0.2 to 1.0 g / L.

The treatment liquid of the present invention further contains silica as a Si source for supplying Si (silicon element) to the coating film, but from the viewpoint of incorporating silica in the above-mentioned coating, it is preferable that the treatment liquid contains colloidal silica .

Here, the colloidal silica is a dispersion system in which spherical silica having SiO ₂ as a basic unit is dispersed in a dispersion medium such as water. The amount of the dispersion medium is not particularly limited, but usually the solid content in the colloidal silica is, for example, 20 to 30% by mass.

The average particle diameter of the colloidal silica used in the present invention is preferably 40 nm or less. When the average particle diameter of the colloidal silica is within this range, the specific surface area of the Si compound precipitated in the coating film becomes larger and the resin adhesion is more excellent.

On the other hand, the lower limit value of the average particle size of the colloidal silica is not particularly limited, and is preferably 5 nm or more, which is generally distributed.

The average particle size can be measured by the BET method (converted from the specific surface area by the adsorption method). It is also possible to substitute the average value measured in an electron microscope photograph.

The content of the Si compound in the treatment liquid of the present invention is preferably 0.01 to 5.0 g / L, more preferably 0.1 to 4.0 g / L in the case of colloidal silica.

The treatment liquid of the present invention preferably contains a conduction assisting agent. Specifically, it is preferable that the treatment liquid contains, as the conduction aid, an anion which is a nitrate ion and an anion selected from the group consisting of potassium ion, ammonium ion and sodium ion It is preferable that the cationic compound contains at least one kind of cation selected.

By including the above-mentioned conductive agent in the treatment liquid of the present invention, the line speed at which the coating film can be formed can be increased. That is, high-speed operation is excellent. This is considered to be because the electric conductivity of the treatment liquid, that is, the liquid resistance, is reduced and improved by including the conductive auxiliary agent, and it becomes easy to energize the high current accompanying the increase in the speed.

The conductive auxiliary is substantially a salt in which the anion and the cation ionically bond (for example, ammonium nitrate, potassium nitrate, sodium nitrate, etc.) to the treatment liquid of the present invention, Is preferably from 0.1 to 10.0 g / L, more preferably from 0.5 to 5.0 g / L, from the viewpoint of better properties.

As the solvent in the treatment liquid of the present invention, usually water is used, but organic solvents may be used in combination.

The pH of the treatment liquid of the present invention is not particularly limited, but is preferably 2.0 to 5.0. Within this range, the treatment time can be shortened and the stability of the treatment liquid is excellent.

For adjusting the pH, known acid components (e.g., phosphoric acid, sulfuric acid) and alkali components (e.g., sodium hydroxide and ammonia water) can be used.

The treatment liquid of the present invention may contain a surfactant such as sodium lauryl sulfate or acetylene glycol, if necessary. From the standpoint of stability over time of the adhesion behavior, the treatment liquid may contain a condensed phosphate such as a pyroluric acid salt.

The process returns to the description of the film forming process. In the film-forming step, the liquid temperature of the treatment liquid at the time of the treatment is preferably 20 to 80 占 폚, more preferably 40 to 60 占 폚, from the viewpoints of the formation efficiency of the coating film and uniformity of the structure, Is more preferable.

In the film forming step, the electrolytic current density at the time of performing the negative electrode electrolytic treatment is preferably low current density because of the fact that the formed film is more excellent in resin adhesion and corrosion resistance, and more specifically in the range of 0.05 to 7.0 A / dm 2 is preferable, and 1.0 to 4.0 A / dm 2 is more preferable. By using the treatment liquid of the present invention, it is possible to form a film at a low current density.

At this time, the energization time of the negative electrode electrolytic treatment is preferably 0.1 to 5 seconds, more preferably 0.3 to 2 seconds, in view of further suppressing the deposition amount and stably forming the coating film, desirable.

The electric-charge density in the negative electrode electrolytic treatment is preferably 0.20 to 15 C / dm 2, more preferably 0.40 to 10 C / dm 2.

After the negative electrode electrolytic treatment or the like, the obtained steel sheet may be washed with water and / or dried, if necessary, in order to remove unreacted materials. The temperature and method at the time of drying are not particularly limited, and for example, a normal dryer or an electric furnace drying method can be applied.

The temperature for the drying treatment is preferably 100 占 폚 or lower. The lower limit is not particularly limited, but is usually about room temperature.

The steel sheet for a container of the present invention obtained by the production method of the present invention is used for the production of various containers such as DI cans, food cans and beverage cans.

Example

Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to these.

&Lt; Production of coated steel sheet >

A coated steel sheet was produced by the following two methods [(K-1) and (K-2)].

(K-1)

A steel sheet (T4 original plate) having a plate thickness of 0.22 mm was subjected to electrolytic degreasing and pickling, and thereafter, Sn plating was performed. Subsequently, a heating and melting treatment was carried out at a temperature equal to or higher than the melting point of tin, and a plating layer of Sn adhered to one side surface shown in Table 2 was formed on both sides of the T4 original plate. Thus, a plating layer made of an Fe-Sn alloy layer / a Sn layer was formed in this order from the lower layer side.

(K-2)

From after forming the steel nickel plated layer as one surface per Ni coating weight by using a degreased, and Watt bath electrolytic (T4 disc) shown in the second table of the plate thickness 0.22㎜ on both _{sides, 10vol.% H 2 + 90vol} .% N 2 atmosphere The Ni-Fe alloy layer (Ni-containing layer) (indicating Ni deposition amount in Table 2) was formed on both surfaces by diffusion and penetration of nickel plating by annealing at 700 占 폚.

Subsequently, a steel sheet having a Ni-containing layer in the surface layer was formed on both surfaces with Sn adhering amount as shown in Table 2 by using a Sn plating bath in the second table and then subjected to a heat melting treatment at a melting point of Sn or higher, Were formed on both sides of the T4 original plate. Thus, a plating layer composed of a Ni-Fe alloy layer / an Fe-Sn-Ni alloy layer / a Sn layer was formed in this order from the lower layer side.

<Formation of Coating>

The steel sheet was subjected to cathodic electrolytic treatment using the treatment liquid (solvent: water) having the composition shown in Table 1 under the conditions of bath temperature and electrolysis conditions (current density, energization time) shown in Table 2. Thereafter, the obtained steel sheet was washed with water and dried at room temperature using a blower to form a coating film on both sides.

Examples of the colloidal silica shown in Table 1 include Snowtex OXS (average particle diameter: 6 nm), SNOWTEX OS (average particle diameter: 10 nm), SNOWTEX O (average particle diameter: 15 nm), Snowtex O-40 (average particle diameter: 25 nm) and Snowtex OL (average particle diameter: 45 nm) were used.

As the orthophosphoric acid shown in Table 1, those having a phosphoric acid concentration of 85% by mass were used.

The produced steel sheet was evaluated for resin adhesion and corrosion resistance in the following manner. Each component amount and evaluation results are shown together in Table 2.

The Ti deposition amount, the Zr deposition amount, the Si deposition amount, and the atomic ratio of the coating film were measured by the above-described method.

&Lt; Resin adhesion property &

An isophthalic acid copolymerized polyethylene terephthalate film having a thickness of 25 占 퐉 and a copolymerization ratio of 12 mol% was laminated on both surfaces of the prepared steel sheet for a container to prepare a laminate steel sheet. The laminate was sandwiched between a pair of rubber rolls sandwiched between a steel sheet heated at 210 ° C and a film, and the film was water-cooled within 1 sec after passing through the rubber rolls. At this time, the transfer speed of the steel sheet was 40 m / min, and the nip length of the rubber roll was 17 mm. Here, the nip length refers to the length in the conveying direction of the portion where the rubber roll and the steel plate are in contact with each other. Then, the laminate steel sheet thus prepared was evaluated for the following resin adhesion.

The resin adhesion was evaluated by a 180-degree peel test in a retort atmosphere at a temperature of 150 ° C and a relative humidity of 100%. The 180-degree fill test is a test using a test piece (size: 30 mm x 100 mm) in which a part 3 of the steel sheet 1 is cut off while leaving the film 2 as shown in Fig. 1 (a) (b), a weight 4 (150 g) is placed on one end of the test piece, folded back 180 degrees to the film 2 side, and left for 30 minutes. Then, the peel length 5 shown in Fig. 1 (c) was measured, and the resin adhesion was evaluated as follows. When? Or?, The resin adhesion was good.

?: Peeling length is less than 40 mm

?: Peeling length of 40 mm or more and less than 50 mm

DELTA: Peeling length was 50 mm or more and less than 70 mm

X: Peel length of not less than 70 mm

<Corrosion resistance>

An epoxy phenolic coating material was applied to both surfaces of the prepared steel sheet for containers so as to have an adhesion amount of 50 mg / dm 2, and then baked at 210 캜 for 10 minutes to form a coating film. Subsequently, it was immersed in a beaker containing commercially available tomato juice at 50 占 폚 for 10 days to visually observe peeling of the coating film and occurrence of rust, and evaluated as follows.

○: No peeling of coating film and no rusting (equivalent to chromate treatment)

?: No peeling of coating film, slightly rusting

X: Peeling of the coating film, remarkable rusting

As is clear from the results shown in Tables 1 and 2, it was confirmed that all of the inventive examples were excellent in resin adhesion and corrosion resistance.

On the other hand, Comparative Examples 1, 2, 8 and 9, in which the amount of Zr adhered is less than 1 mg / m 2, were inferior in resin adhesion and corrosion resistance.

Also, in Comparative Examples 3, 4, 10 and 11 in which the Ti adhesion amount was 0.5 mg / m 2 or less, the resin adhesion was inferior.

In addition, in Comparative Examples 5 to 7 and 12 to 14 in which the Si adhesion amount was less than 1 mg / m 2 or more than 40 mg / m 2, resin adhesion was inferior.

1: Steel plate for containers
2: Film
3: Cutted part of steel sheet
4: Chu
5: Peel length

Claims (4)

1. A steel sheet for a container having a plated steel sheet having a plated layer including a Sn layer covering at least a part of a surface of the steel sheet and a coating disposed on a surface of the plated steel sheet on the plated layer side,
Wherein the coating contains Zr, Ti and silica,
Wherein the coating amount of the coated steel sheet is in the range of 1 to 40 mg / m &lt; 2 &gt; in terms of Zr per one side of the coated steel sheet, and the coating amount of the coated steel sheet in terms of Ti per one side is less than 10 mg / A steel sheet for containers having an adhesion amount of 1 to 40 mg / m 2 in terms of Si per one side face. The method according to claim 1,
Wherein the coating has an adhesion amount of less than 3 mg / m &lt; 2 &gt; and less than 10 mg / m &lt; 2 &gt; in terms of Ti per one side of the coated steel sheet. 3. The method according to claim 1 or 2,
Wherein an atomic ratio (Ti / Zr) between Ti and Zr on the outermost surface of the coating film opposite to the plated steel sheet side is 0.05 to 2.0 and an atomic ratio (Si / Zr) between Si and Zr is 0.1 to 3.0 Steel plates for containers. 4. The method according to any one of claims 1 to 3,
Wherein the plating layer further comprises at least one layer selected from the group consisting of a Ni layer, a Ni-Fe alloy layer, an Fe-Sn alloy layer and an Fe-Sn-Ni alloy layer.

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