KR102075224B1 - Coated steel sheet having excellent adhesion property and metal bonded body using the same, and manufacturing method manufacturing method thereof - Google Patents

Abstract

Excellent coated steel sheet according to an embodiment of the present invention, the steel sheet; And a metal coating layer formed on at least one surface of the steel sheet using metal powder, wherein the surface portion of the metal coating layer may be provided in a pore structure in which open pores are formed.

Description

Coated steel sheet having excellent adhesion property and metal bonded body using the same, and manufacturing method manufacturing method

The present invention relates to a coated steel sheet having excellent adhesiveness and a metal joint using the same, and a method for manufacturing the same, and more particularly, to a coated steel sheet having a coating layer having excellent adhesiveness, and a metal joint using the same, and a method for manufacturing the same. will be.

Recently, in order to improve the rigidity, collision performance, durability, etc. of automobile bodies, researches on new joining methods using adhesives and the application of the latest materials such as ultra high strength steel are being actively conducted. This is because the adhesive is easy to be applied to the parts that are difficult to weld due to its structure, it is possible to form a wider joint surface than welding or mechanical fastening, and it is also applicable to aluminum or carbon fiber reinforced plastics (CFRP), which are difficult to weld. . Automotive adhesives can be classified into structural, semi-structural, and non-structural adhesives according to their application areas. Among them, epoxy adhesives having excellent mechanical strength are mainly used as structural adhesives requiring the strongest adhesive performance.

Republic of Korea Patent Publication No. 10-2006-0074533 (July 03, 2006)

According to one aspect of the present invention, a coated steel sheet having a coating layer having excellent adhesiveness, a metal joint using the same, and a method of manufacturing the same may be provided.

The subject of this invention is not limited to what was mentioned above. Those skilled in the art will have no difficulty understanding the additional subject matter of the present invention from the general contents of this specification.

Excellent coated steel sheet according to an embodiment of the present invention, the steel sheet; And a metal coating layer formed on at least one surface of the steel sheet using metal powder, wherein the surface portion of the metal coating layer may be provided in a pore structure in which open pores are formed.

The average size of the pores exposed on the surface of the metal coating layer may be 0.5 ~ 2.0㎛.

The porosity at the top and bottom of the metal coating layer surface portion may be provided with a porosity larger than the porosity at the center portion in the thickness direction of the metal coating layer surface portion.

The average particle size of the metal powder may be 0.5 ~ 20㎛.

The metal powder is copper (Cu), aluminum (Al), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), molybdenum (Mo), titanium (Ti), cobalt (Co), manganese It may be at least one metal powder selected from (Mn), tungsten (W), zirconium (Zr) and tin (Sn).

The metal assembly according to an embodiment of the present invention further includes an adhesive layer formed by applying an adhesive to any one of the coated steel sheets of the coated steel sheet, and the steel sheet is bonded to the same or different materials by the adhesive force of the adhesive. Can be.

The adhesive may be filled in the pores of the metal coating layer.

In the method of manufacturing a coated steel sheet having excellent adhesion according to an embodiment of the present invention, a metal coating layer is formed on a surface of a steel sheet by spraying heated metal powder by vacuuming the heated gas, and spraying the metal powder. As it proceeds, the metal coating layer may be formed by differentially applying the injection speed of the metal powder.

The injection timing of the metal powder is divided into a densification section from immediately after the start of the metal powder and a pore section from after the densification section to the end of the injection of the metal powder, and in the pore section, the metal in the densification section. The metal powder may be sprayed at an average spray rate slower than the average spray rate of powder.

The injection speed of the metal powder in the pore section may gradually decrease with time.

The metal powder is copper (Cu), aluminum (Al), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), molybdenum (Mo), titanium (Ti), cobalt (Co), manganese At least one metal powder selected from (Mn), tungsten (W), zirconium (Zr), and tin (Sn), and may be heated to a temperature range below the softening point of room temperature or more to piggyback on the vacuum injection of the gas.

The average particle size of the metal powder may be 0.5 ~ 20㎛.

Wherein the base is a nitrogen (N _2), helium (H ₂₎ and the or at least one of air, nitrogen (N _2), helium (H ₂₎ and is one or more of the mixture of air, heating at a temperature range of 150 ~ 600 ℃ Can be vacuum injected.

The heated gas may be vacuum injected toward a low pressure space provided at a pressure of 0.01 to 20 Torr, and the metal coating layer may be formed on at least one surface of the steel sheet in the low pressure space.

Method for producing a metal assembly according to an embodiment of the present invention, applying an adhesive on the metal coating layer of the coated steel sheet produced by the manufacturing method; The adhesive may be bonded to the coated steel sheet is coated with a heterogeneous or homogeneous material.

Steel sheet excellent in adhesion and a method of manufacturing the same according to an embodiment of the present invention, since the surface portion of the metal coating layer is provided in a pore structure, it is possible to effectively improve the adhesive strength with the adhesive when applying the adhesive.

Therefore, the metal assembly and the method of manufacturing the same according to an embodiment of the present invention can provide a metal assembly having improved rigidity and structural safety.

1 is a view schematically showing a cross section of the coated steel sheet excellent in the adhesiveness of the present invention.
FIG. 2 is an enlarged view of a cross section of the coating layer represented by A of FIG. 1.
3 is a view schematically showing an example of a quick conjugate according to an embodiment of the present invention.
4 is a graph exemplarily showing the relationship between the injection time of metal powder and the metal powder injection speed.

The present invention relates to a coated steel sheet having excellent adhesiveness, a metal joint using the same, and a method of manufacturing the same. Hereinafter, exemplary embodiments of the present invention will be described. Embodiments of the invention may be modified in various forms, the scope of the invention should not be construed as limited to the embodiments described below. These embodiments are provided to explain in detail the present invention to those skilled in the art.

1 is a view schematically showing a cross section of the coated steel sheet excellent in the adhesiveness of the present invention.

As shown in FIG. 1, the coated steel sheet 1 having excellent adhesiveness according to an embodiment of the present invention may include a steel sheet 3 and a metal coating layer 5 formed on at least one surface of the steel sheet 3. have. The steel sheet 3 of the present invention is not particularly limited to a steel sheet to which a metal coating method can be applied, but is made of a hot rolled steel sheet, a cold rolled steel sheet, a cold rolled annealed sheet, a galvanized steel sheet, a zinc-based alloy plated steel sheet, and an aluminum-based alloy plated steel sheet. It may be any one steel sheet selected from the group.

The metal coating layer 5 of the present invention may be formed by the sprayed metal powder 4, and in particular may be formed by the sprayed metal powder 4 by the low vacuum powder spraying method. Metal powder 4 of the present invention is copper (Cu), aluminum (Al), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), molybdenum (Mo), titanium (Ti), cobalt It may be at least one metal powder selected from (Co), manganese (Mn), tungsten (W), zirconium (Zr), and tin (Sn). However, the metal powder 4 of the present invention is not necessarily limited thereto, and may be any one of these metals, an alloy containing two or more of these, or an alloy containing at least one of these, and for example, stainless steel powder. It can be used, as well as Fe-based metals such as stainless steel powder of 200 series, 300 series, 400 series, etc., high-strength alloy powder, etc. can also be used.

A plurality of voids 6 are formed in the surface portion 5b of the metal coating layer 5, and the surface portion 5b may be provided in a pore structure. The voids 6 of the surface portion 5b may be formed between the metal powder 4 constituting the surface portion 5b or the aggregate of the metal powders 4, and the voids 6 formed in the surface portion 5b. May be an open void. That is, the pores 6 formed in the surface portion 5b may be open pores having a shape connected to the outside of the metal coating layer 5.

A plurality of open voids 6 are formed on the surface portion 5b, and when the adhesive is applied, the adhesive may be filled and filled into the voids 6. The adhesive is introduced into the voids 6 and filled, so that the contact area between the metal coating layer 5 and the adhesive becomes wide in preparation for the case where the voids 6 are not formed, and thus the metal coating layer 5 and the adhesive The adhesive force of can be improved. In order for the flowable adhesive to smoothly flow into the pores 6, the sizes of the pores 6 must be provided at a predetermined size or more. That is, the present invention can limit the average size of the pores 6 exposed to the outside from the surface of the metal coating layer 5 to 0.5 μm or more so that the flowable adhesive sufficiently flows into the pores. As the size of the pore 6 increases, the flow rate of the flowable adhesive flowing into one pore 6 may increase, but the upper limit of the average size of the pore 6 is determined by the particle size of the metal powder 4. Therefore, in the present invention, the average size of the pores 6 exposed to the outside at the surface of the metal coating layer 5 may be limited to 20㎛.

The average particle size of the metal powder 4 used to form the metal coating layer 5 may be 0.5 ~ 20㎛. If the average particle size of the metal powder 4 is excessively small, it is not preferable in terms of economics because the injection amount of gas is excessively required. Further, in order to form the voids 6 of the desired size in the surface layer portion of the metal coating layer 5, the present invention can limit the lower limit of the average particle size of the metal powder 4 to 0.5 mu m. In addition, when the average particle size of the metal powder 4 is excessively large, it is difficult to secure the bonding force between the steel plate 3 and the metal coating layer 5 to a predetermined level or more. An upper limit can be limited to 20 micrometers.

In order to improve the bonding force between the steel plate 3 and the metal coating layer 5, the metal powder 4 is dense at the lower portion 5b of the metal coating layer 5 adjacent to the interface between the steel plate 3 and the metal coating layer 5. The porosity of the lower portion 5a of the metal coating layer 5 may be provided at a significantly lower level than the porosity of the surface portion 5b of the metal coating layer 5. In FIG. 1, the lower portion 5a and the surface portion 5b of the metal coating layer 5 provided at relatively similar heights are illustrated for convenience of description, but this is only an example for describing the present invention, and the target metal Depending on the thickness of the coating layer 5 and the size of the metal powder 4, the thickness of the lower portion 5a and the surface portion 5b of the metal coating layer 5 may be provided in various ways.

FIG. 2 is an enlarged view of a cross section of the coating layer represented by A of FIG. 1.

As shown in FIG. 2, when the surface portion 5b of the metal coating layer 5 is divided into an upper portion (x-x '), a central portion (y-y'), and a lower portion (z-z '), the upper portion (x -x ') and the average porosity at the bottom (z-z') may be provided at a level higher than the average porosity at the center (y-y '). That is, the metal powder 4 or the aggregate of the metal powders 4 constituting the surface portion 5b has a shape such as a spherical shape or a crushed sphere shape, and the voids 6 have these metal powders 4 or metal powders 4. ) May have a shape corresponding to that of the aggregate. The average area of the cross section of the void 6 tends to decrease from the top (x-x ') toward the center (y-y') and increases from the center (y-y ') to the bottom (z-z'). May tend to Therefore, in the surface part 5b of this invention, the space | gap 6 of the shape whose average cross-sectional area of central part y-y 'is smaller than the average cross-sectional area of upper part x-x' and lower part z-z 'is provided. As a result, the ease of penetration of the adhesive into the voids 6 can be effectively ensured, and the physical bonding strength of the adhesive solidified in the voids 6 and the metal coating layer 5 can be effectively improved.

Therefore, the coated steel sheet 1 according to the embodiment of the present invention provides the surface portion 5b of the metal coating layer 5 as a pore structure, thereby effectively improving the adhesive force with the adhesive.

3 is a view schematically showing an example of a quick conjugate according to an embodiment of the present invention.

As shown in Figure 3, the metal assembly 10 according to an embodiment of the present invention is the coating steel sheet 5, the adhesive layer 7 formed on the metal coating layer 5, the same type that is bonded by the adhesive Or it may include a heterogeneous material (9). The adhesive of the present invention may include an epoxy resin, synthetic rubber, PVC, etc., but is not necessarily limited thereto, and any adhesive capable of providing adhesion between a material and a material may be included therein.

As described above, the metal coating layer 5 of the coated steel sheet 5 is provided with a porous surface portion 5b, which can effectively secure the adhesive force between the adhesive and the coated steel sheet 5, according to one embodiment of the invention. Metal assembly 10 according to the example can ensure a certain level of rigidity and structural safety. In addition, although not directly shown in Figure 3, the quick bond 10 according to an embodiment of the present invention may include a coated steel sheet 5 is arranged so that the surface portion (5b) facing each other and bonded by an adhesive agent In addition, it is possible to secure improved rigidity and structural stability.

Hereinafter, the manufacturing method of the present invention will be described in more detail.

According to an embodiment of the present invention, a method of manufacturing an excellent steel sheet has a metal coating layer formed on a surface of a steel sheet by spraying metal powder by piggybacking on a vacuum spray of heated gas. Accordingly, the metal coating layer may be formed by differentially applying the injection speed of the metal powder. That is, in the method of manufacturing a steel sheet having excellent adhesion according to an embodiment of the present invention, the metal coating layer is formed on the surface of the steel sheet by a low vacuum powder spraying method. By adjusting, the coating layer surface portion may be provided in an open pore structure.

The low vacuum spray powder method sprays air heated above a certain temperature in a vacuum chamber maintained at a constant pressure, but piggybacks on heated gas to spray heated metal powder to spray the surface of the steel sheet disposed inside the vacuum chamber. It is a coating method for forming a metal coating layer. That is, the heated gas has a relatively high pressure, and the heated gas is injected toward the inside of the vacuum chamber in a relatively low vacuum state, the gas injection speed can be accelerated by the pressure difference.

The pressure inside the vacuum chamber can be maintained at a level of 0.01-20 Torr. When the pressure inside the vacuum chamber is less than 0.01 Torr, the manufacturing cost may be excessively increased to form a high vacuum. When the pressure inside the vacuum chamber exceeds 20 Torr, the pressure inside the vacuum chamber is excessive to heat the gas. In spite of this, it is impossible to secure a sufficient gas injection rate.

Gas of the present invention preferably has a density of air or less, nitrogen (N _2), helium (H ₂₎ and the or at least one of air, nitrogen (N _2), helium for one or more of (H ₂₎ and the air It may be a mixture. The heating temperature of the gas may be 150 ~ 600 ℃, the heating temperature of the preferred gas may be 200 ~ 500 ℃. If the heating temperature of the gas is less than 150 ° C., sufficient gas pressure for the injection of the metal powder cannot be ensured. If the heating temperature of the gas exceeds 600 ° C., the injection speed of the metal powder rises excessively and damages the surface of the steel sheet. Or material bending problems due to high temperatures may occur. That is, in the present invention, when the gas heated at an appropriate temperature is sprayed by piggybacking the metal powder, the metal powder may be sprayed in a low temperature and low pressure atmosphere to form a metal coating layer.

The metal powder is copper (Cu), aluminum (Al), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), molybdenum (Mo), titanium (Ti), cobalt (Co), manganese ( Mn), tungsten (W), zirconium (Zr) and tin (Sn) may be at least one metal powder selected from. However, the metal powder of the present invention is not necessarily limited thereto, and may be any one of these metals, alloys of two or more thereof, or an alloy including at least one of them, and for example, stainless steel powder may be used. Fe-based metals such as stainless steel powders of the 200 series, 300 series, 400 series, and the like can be used as well as high strength alloy powders.

The average particle size of the metal powder may be 0.5 ~ 20㎛, more preferably the average particle size of the metal powder may be 0.5 ~ 10㎛. When the average particle size of the metal powder is less than 0.5 µm, pores of a desired size cannot be formed in the surface portion of the metal coating layer, and excessive cost may be consumed in forming the metal coating layer. On the other hand, if the average particle size of the metal powder exceeds 20㎛, the surface shape of the metal coating layer may be uneven. The heating temperature of the metal powder may be a temperature range below the softening point of room temperature or more, where the room temperature may mean a temperature range of about 15 ~ 25 ℃.

4 is a graph exemplarily showing the relationship between the injection time of metal powder and the metal powder injection speed.

As shown in Figure 4, when forming the metal coating layer of the present invention as the injection time of the metal powder elapses it may be applied differentially the injection speed of the metal powder. That is, the injection time of the metal powder may be separated by a densified zone (t ₁₎ and a densified zone (t ₁₎ injection until the end of three Republic interval fingers of the metal powder from the later (t ₂₎ of from immediately after the start of the metal powder, In the pore section t ₂ , the metal powder may be sprayed at an average injection speed v _e2 lower than the average injection speed v _e1 of the metal powder in the densification section t ₁ . In the densification section (t ₁ ), the metal powder should be sprayed at an average injection speed (v _e1 ) of a predetermined level or more so that the metal powder is densely concentrated on the interface side between the metal coating layer and the steel sheet, and in the pore section (t ₂ ) The metal powder may be sprayed such that the instantaneous injection speed v _{2 of} the metal powder gradually decreases to form a desired void in the surface portion of the coating layer.

The densification section t ₁ and the pore section t ₂ may be determined by the ratio of the corresponding section according to the thickness of the desired coating layer and the thickness of the surface of the metal coating layer. In addition, the reduction ratio of the average injection speed v _e2 and the instantaneous injection speed v ₂ may be determined according to the shape and porosity of the desired pore in the injection amount of the metal powder in the pore section t ₂ . 4 shows the moment of the metal powder injection in three Republic interval (t ₂₎ speed (v ₂₎ is however shown to decrease linearly, which is only an example of the metal powder injection speed change, the present invention provides three Republic interval In (t ₂ ) may include a case in which the injection speed of the metal powder decreases non-linearly.

The injection speed of the metal powder can be controlled by adjusting the heating temperature of the gas or the pressure inside the vacuum chamber. That is, the injection speed of the metal powder can be decreased by lowering the gas heating temperature or increasing the pressure inside the vacuum chamber, and the injection speed of the metal powder is increased by increasing the heating temperature of the gas or lowering the pressure inside the vacuum chamber. You can.

According to an embodiment of the present invention, a method of manufacturing a coated steel sheet excellent in adhesion is to form a metal coating layer on the surface of a steel sheet by a low vacuum powder spraying method, by appropriately adjusting the injection amount of the metal powder according to the spraying time of the metal powder. Providing the surface of the metal coating layer in a porous void structure, it is possible to effectively improve the adhesion of the coated steel sheet by the adhesive.

In the method for manufacturing a fast bonded body according to one embodiment of the present invention, a metal joined body may be manufactured by applying an adhesive on a coating layer of a steel sheet manufactured by the above-described manufacturing method, and bonding the same or different materials in close contact. .

In addition, the metal joint according to an embodiment of the present invention is manufactured by adhering a coated steel sheet manufactured by the above-described manufacturing method with the same or different materials with an adhesive, and thus, the rigidity and structural safety of the metal joint manufactured therefrom. It can be effectively secured.

The present invention will be described in more detail with reference to the following Examples.

(Example)

The Zn powder having the average particle size shown in Table 1 was sprayed under the same spraying conditions, thereby preparing specimens each having a coating layer. The specimens were processed into two sheets of 25 mm * 100 mm each and coated with washing oil. The specimens were placed vertically and left to dry for one day. Apply an adhesive (mastic sealer) to the size of 25mm (width) * 25mm (length) * 3mm (height) within 10mm from the end of the dried specimen, and the remaining specimens are superimposed and cured at 170 ℃ for 20 minutes Shear test was performed along the thickness direction, and the cohesive failure rate of the adhesive was measured and shown in Table 1. Cohesive failure rate means the ratio of adhesive remaining in the adhesive area of each specimen, 100% cohesive failure rate means that the percentage of adhesive remaining in the adhesive area of the separated specimen 100%.

division Metal Powder Average Particle Size
(Μm) Surface void mean size
(Μm) Coagulation Rate
(%) Comparative Example 1 Coating layer not formed 5 Comparative Example 2 0.3 0.15 10 Comparative Example 3 0.4 0.3 30 Inventive Example 1 0.5 0.5 90 Inventive Example 2 One 0.8 100 Inventive Example 3 5 3.5 100 Inventive Example 4 10 5.2 100 Inventive Example 5 20 13.5 100

As shown in Table 1, it can be seen that as the average particle size of the metal powder increases, the size of the pores exposed on the surface of the metal coating layer increases, and the agglomeration fracture rate is significantly increased based on the average particle size of the 0.5 μm metal powder. Can be confirmed.

Comparative Example 1 is a specimen in which roughening is performed by performing an additional polishing operation without forming a coating layer for comparison with the invention example. In the case of Comparative Example 1 it can be confirmed that the cohesive failure rate is 5% level, the adhesive strength of the adhesive is significantly low.

Comparative Examples 2 and 3 formed a metal coating layer, but since the pores exposed on the surface of the metal coating layer were not provided in such a size that the fluid adhesive could smoothly flow in, the increase in the cohesive failure rate did not exceed 30%. You can check it.

On the other hand, in the case of Inventive Examples 1 to 5, the size of the pores exposed to the surface of the metal coating layer is secured to a certain level or more, and thus the adhesive area of the adhesive is significantly increased, thereby securing a cohesive failure rate of 90% or more. can confirm.

Therefore, the steel sheet excellent in adhesiveness according to an embodiment of the present invention and a method for manufacturing the same, since the surface portion of the metal coating layer is provided in a pore structure, it can be seen that the adhesive force with the adhesive can be effectively improved when the adhesive is applied.

Although the present invention has been described in detail through the embodiments, other forms of embodiments are also possible. Therefore, the spirit and scope of the claims set forth below are not limited to the embodiments.

1: coated steel sheet 3: steel sheet 5: metal coating layer
5a: lower portion 5b: surface portion 7: adhesive layer
9: material 10: metal joint

Claims (15)

Steel sheet; And
Including a metal coating layer formed using a metal powder on at least one side of the steel sheet,
The metal coating layer,
A surface portion provided on the surface side of the metal coating layer and provided in a pore structure in which open pores are formed; And
It is provided on the interface side with the steel plate, and divided into lower parts having a lower porosity than the surface portion,
The shape of the open pores formed in the surface portion is provided to have a tendency to gradually decrease the cross-sectional area of the pores toward the thickness direction of the metal coating layer from the surface of the metal coating layer, the coating steel with excellent adhesion. The method of claim 1,
The coated steel sheet excellent in adhesion, the average size of the pores exposed on the surface of the metal coating layer is 0.5 ~ 2.0㎛. delete The method of claim 1,
The average particle size of the metal powder is 0.5 ~ 20㎛, coated steel sheet excellent in adhesion. The method of claim 1,
The metal powder is copper (Cu), aluminum (Al), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), molybdenum (Mo), titanium (Ti), cobalt (Co), manganese A coated steel sheet having excellent adhesion, which is at least one metal powder selected from (Mn), tungsten (W), zirconium (Zr), and tin (Sn). Claims 1, 2, 4 and 5 further comprises an adhesive layer formed by applying an adhesive to any one of the coated steel sheet, the steel sheet is bonded to the same or different materials by the adhesive strength of the adhesive Metal assembly. The method of claim 6,
The metal joint is filled with the adhesive in the pores of the metal coating layer. The metal coating layer is formed on the surface of the steel sheet by spraying the heated metal powder by piggybacking on the vacuum injection of the heated gas,
The injection timing of the metal powder is divided into a densification section immediately after the injection start of the metal powder and a pore section from after the densification section to the end of the injection of the metal powder,
In the pore section, the metal powder is sprayed at an average spraying speed slower than the average spraying speed of the metal powder in the densifying section, but the metal powder spray rate gradually decreases over time. Manufacturing a coated steel sheet having excellent adhesion by forming open pores having a tendency to gradually increase in cross-sectional area from the surface of the metal coating layer toward the thickness direction of the metal coating layer and then increase. Way. delete delete The method of claim 8,
The metal powder is copper (Cu), aluminum (Al), zinc (Zn), iron (Fe), nickel (Ni), chromium (Cr), molybdenum (Mo), titanium (Ti), cobalt (Co), manganese At least one metal powder selected from (Mn), tungsten (W), zirconium (Zr), and tin (Sn), and heated to a temperature range below the softening point at room temperature to piggyback on the vacuum spray of the gas. Method for producing excellent coated steel sheet. The method of claim 8,
The average particle size of the metal powder is 0.5 ~ 20㎛, manufacturing method of the coated steel sheet excellent in adhesion. The method of claim 8,
Wherein the base is a nitrogen (N _2), helium (H ₂₎ and the or at least one of air, nitrogen (N _2), helium (H ₂₎ and is one or more of the mixture of air, heating at a temperature range of 150 ~ 600 ℃ A method of producing a coated steel sheet excellent in adhesion, which is vacuum sprayed. The method of claim 8,
The heated gas is vacuum sprayed toward the low pressure space provided at a pressure of 0.01 ~ 20 Torr,
The metal coating layer is formed on at least one surface of the steel sheet in the low pressure space, the manufacturing method of the coated steel sheet excellent in adhesion. Applying an adhesive onto the metal coating layer of the coated steel sheet produced by the manufacturing method of any one of claims 8 and 11;
The adhesive is applied to the coated steel sheet is bonded to a heterogeneous or the same material in close contact, the manufacturing method of a metal joint.

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