JPS5914105B2 - Manufacturing method of metal plating body - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a metal plated body.

For more details, please refer to the direct vapor deposition method or spats 35 on the metal surface.
The present invention relates to a method of obtaining a high-brightness metal plated body by forming a metal plated layer by a taring method. 10:- Aluminum, copper, etc. are already on the surface of the metal molded product. A known method is to perform metal plating using metals such as chromium, nickel, or alloys thereof, by vacuum evaporation, sputtering, or the like.

However, according to such conventional methods, a metal plating layer is formed directly on the surface of the metal adherend, but since the thickness of the metal plating layer is extremely thin, less than 1 micron, the surface may be scratched or lack smoothness. As a result, the appearance was extremely poor, and furthermore, the adhesion between the surface of the adherend and the metal plating layer was extremely poor, and the metal plating layer often came off. Therefore, in order to compensate for these defects, a thermosetting resin coating with a thickness of about 30 to 50 microns is interposed as a base coat layer between the adherend surface and the metal plating layer, and a metal plating layer is formed on the surface of the resin coating. Discipline is commonly used. However, in the case of known resin clears, it is difficult to obtain a thick film with one coat; at least two coats are required to obtain a film thickness of about 50 microns, and if the material surface is in poor condition, more coats may be applied. was necessary. However, the current high-temperature baking type clear resin described above to obtain multiple layers requires high energy and a long time each time, which is not only unfavorable in terms of production efficiency, but also causes thermal deterioration of the lower layer coating due to overbaking. It also caused a decrease in the mutual adhesion between the layers.
In recent years, in order to solve the above-mentioned problems, many attempts have been made to apply a resin liquid having an unsaturated group as a base coat layer and to treat it quickly and efficiently using active energy of ionizing radiation or electromagnetic waves. However, due to various problems, most of them have not reached the practical stage.

In other words, one of the problems is to take an automobile's headlamp reflector as an example.The reflecting surface is made of an aluminum layer made by vacuum evaporation, but during the installation process to the automobile body, one end of the electric circuit cord is attached to the back of the reflector. It is necessary to solder or apply a waterproof seal, but the heat causes a multicolored rainbow pattern, wrinkles, cracks, etc. on the surface of the aluminum plating layer that hits the reflective surface, causing the original shine of the aluminum plating to disappear and causing diffused reflection. The biggest drawback was that it no longer functioned as a reflector for the headlamp.
The present invention aims to solve these problems, bring the use of ultraviolet energy to a practical stage, and provide a method for efficiently manufacturing a lighting reflector with excellent heat resistance in a short period of time. That is, the present invention provides a method for manufacturing a metal-plated body in which a UV-curable base coat paint is applied to a metal surface and cured by UV irradiation, and then metal plating is performed on the base coat paint, which comprises: (a) before applying the base coat paint; After applying a thermosetting resin liquid onto a metal material and curing it by heating to obtain a brimer coat layer, a resin liquid having at least one unsaturated group in the molecule is applied onto the layer. , irradiating with ultraviolet rays to solidify to obtain a base coat layer; and (b) on the base coat layer,
(1) Immediately before performing metal plating by vacuum evaporation method or sputtering method,
or (11) 1X10-
The present invention relates to a method for manufacturing a metal-plated body, characterized in that metal plating is performed by a vacuum evaporation method at a degree of vacuum of 5T0rr or more.

In the present invention, the thermosetting resin used in the primer coat layer means a resin that forms a crosslinked structure when heated, or that promotes the formation of a crosslinked structure (for example, it also includes polyurethane resin, epoxy resin, etc.). ). Therefore, a thermosetting resin liquid is a composition made by mixing a synthetic resin containing groups necessary to react with each other and form a crosslinked structure when heated, a solvent (organic solvent, water, etc.), other additives, etc. It is a thing. For example, combinations of mutually reactive groups include carboxyl groups (including acid anhydride groups) to
Epoxy group, carboxyl group (including acid anhydride group) to hydroxyl group, hydroxyl group to epoxy group, hydroxyl group to isocyanate group (including protoxyisocyanate group), epoxy group to amino group, hydroxyl group to methylol group, hydroxyl group to ether Examples include a methylol group. More specifically, typical examples include melamine-alkyd resin, acrylic-alkyd resin, acrylic-melamine resin, self-curing acrylic resin, epoxy-phenolic resin, epoxy-polyamide resin, polyester-isocyanate resin, etc. . In the present invention, the resin liquid having at least one unsaturated group in the molecule used for the base coat layer contains a polymerizable polymer and/or oligomer as a main component, and optionally a polymerizable monomer. , an organic solvent, and a photosensitizer.

More specifically, a polymerizable polymer and/or oligomer is a polymer and/or oligomer having at least one unsaturated group in the molecule, such as unsaturated polyester resin, unsaturated Examples include acrylic resin, polyester-modified acrylic resin, epoxy-modified acrylic resin, urethane-modified acrylic resin, alkyd-modified acrylic resin, unsaturated group-containing polyolefin resin, and drying oil. Unsaturated polyester resins include, for example, Polylite CH-303 (trade name, manufactured by Dainippon Ink and Chemicals Co., Ltd.); unsaturated acrylic resins include Diabeam K-8303 (trade name, manufactured by Mitsubishi Rayon Co., Ltd.); polyester; Aronix M8O3 as a modified acrylic resin
O, Aronix M8O6O [Toagosei Chemical Industry Co., Ltd.]
product name] etc.

In addition, as the epoxy modified acrylic resin, UcOat
2Ol (trade name, manufactured by Toho Chemical Industries, Ltd.); Daycrite UE81OOl, Daycrite UE82OO (trade name, manufactured by Dainippon Ink and Chemicals, Ltd.), and the like. As the urethane-modified acrylic resin, XP-1077-40
-2, XP-51-27-70-2 [trade name manufactured by Nippon Gosei Kagaku Co., Ltd.], and the like. Examples of the alkyd-modified acrylic resin include XP-14-22 (trade name, manufactured by Nippon Gosei Kagaku Co., Ltd.). In addition, the polymerizable monomer is a monomer having at least one unsaturated group in the molecule, for example, among (meth)acryloyl group-containing monomers, 27 hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, etc., and examples of ether compounds of the hydroxyl group-containing monomer and alkyl alcohol or cyclic alkyl alcohol include methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate. , tetrahydrofurfuryl acrylate, etc. (meth)
As ester compounds of acrylic acid and alkyl alcohol, methyl (meth)acrylate, butyl (meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6 hexanediol di(meth)acrylate,
Examples include trimethylolpropane tri(meth)acrylate. Further, among vinyl group-containing monomers, aromatic vinyl group-containing monomers include styrene, vinyltoluene, etc., and aliphatic vinyl group-containing monomers include vinyl acetate, vinylidene chloride, etc. The resin liquid for the base coat layer of the present invention is mainly composed of a polymerizable polymer and/or oligomer, and is combined with a suitable polymerizable monomer depending on the difficulty of the coating work, the surface condition of the coating film, etc. The properties may be adjusted, and if a low viscosity resin liquid is required for the coating method, an organic solvent may also be used without any problem.

As the polymerizable polymer and/or oligomer, epoxy-modified acrylic resin, polyester-modified acrylic resin,
As the polymerizable monomer, a resin solution mixed with a polymerizable monomer containing a (meth)acryloyl group is preferable, from the viewpoint of smoothness of the base coat layer surface, coating workability, etc. The polymerizable polymer and/or oligomer is preferably 90% by weight to 50% by weight. Most preferred are mixtures of 10% to 50% by weight of polymerizable monomer.

The aforementioned polymerizable polymers, oligomers, and polymerizable monomers are not limited to the use of a mixture of only one type, but it is also possible to combine two or more types to bring out the characteristics of each. Furthermore, since ultraviolet rays are used as an energy source for solidifying the resin liquid for the base coat layer of the present invention, it is necessary to add a photosensitizer.

For example, photosensitizers include benzoin, benzoin methyl ether, benzoin isopropyl ether, benzyl, benzophenone, anthraquinone, naphthoquinone,
Examples include chloranthraquinone, tetramethylthiuram disulfide, diphenyl disulfide, 2,2-diethoxyacetophenone, benzoin peroxide, azobisisobutyronitrile, 2,2-azobispropane, etc. The amount used is 0.05 to 15 parts by weight, preferably 2 to 5 parts by weight, based on 100 parts by weight of the total content of polymerizable polymer and/or oligomer and polymerizable monomer in the resin liquid. Other additives such as a leveling agent, a polymerization inhibitor, an anti-sag agent, etc. can be added to the resin liquid for the primer coat layer and the resin liquid for the base coat layer of the present invention as necessary.On the other hand, talc, It is also possible to mix it with extender pigments such as calcium carbonate, magnesium carbonate, silica, barium sulfate, coloring pigments, antirust pigments, etc. and use it in the same form as known coating compositions.

In particular, if a composition obtained by mixing a thermosetting resin liquid and a pigment used in the primer coat layer of the present invention is used as the primer coat layer, it is extremely effective to obtain a thick film in one coat.

The mixing ratio of the resin liquid for the primer coat layer and the pigment is:
The amount varies depending on the oil absorption amount of the pigment (the bulk specific gravity), so there is no particular limitation, but the ratio is preferably 5 to 200 parts by weight of the pigment per 100 parts by weight of the resin liquid.

In order to obtain the mixture of the resin liquid for the primer coat layer and the pigment, they are mixed using a known dispersing machine such as a roll mill, a dispersion mill, a sand mill, or a ball mill.

The method for manufacturing a metal plating body of the present invention includes a roll coater,
A desired film thickness is preferably applied to the metal surface by a known method such as spraying, curtain flow coater, or brush coating.
The thermosetting resin liquid for the primer coat layer is applied to a thickness of about microns, and the solvent in the layer is scattered by proper setting, and then heated under the conditions necessary to solidify the resin to obtain the primer coat layer. .

Next, the base coat resin liquid is applied onto the primer coat layer by a known method such as a roll coater, spray, curtain flow coater, or brush coating to a desired film thickness, preferably about 30 to 50 microns, and coated as necessary. After setting, irradiate with ultraviolet rays. Furthermore, if a thick base coat layer is required, the base coat layer may be coated multiple times and cured by irradiating ultraviolet rays each time. Next, aluminum, chromium, nickel,
Thickness 200~5 made of metals such as copper and their alloys, etc.
A metal plating layer of about 00λ is formed.

As mentioned above, conventional metal plating bodies obtained by using known ionizing radiation or electromagnetic wave active energy irradiation and solidification as a base coat layer have poor heat resistance and have not been put to practical use. However, as a result of investigating the cause of defects such as multicolored rainbow patterns, wrinkles, cracks, etc., the present inventors discovered that the cause was a trace amount of polymerizable monomer remaining in the base coat layer film after solidification. Ivy.

As a method for removing the residual polymerizable monomer, an attempt was made to extend the ultraviolet irradiation time, but this had little effect. In the pre-process of forming the metal plating layer first, the inventor of the present invention
Applying heat treatment to the base coat layer or lowering the degree of vacuum
They have discovered that the same effect can be achieved by holding the temperature at 10-5T0rr or higher and then applying a metal plating layer using a vacuum evaporation method to heat-treat, and have filed an application for a method for removing residual polymerizable monomers. The present invention further improves the flexibility of the composite layer by using a high molecular weight resin as the primer coat layer.

As explained in the previous application, the present inventor has diligently tried various methods to remove trace amounts of polymerizable monomers remaining in the base coat layer after solidification, and finally arrived at the simple treatment method of the present invention. It is something.

The most distinctive feature of the present invention is the heat treatment after solidifying by irradiating ultraviolet rays, that is, the heating process before the step of forming a metal plating layer, which will be described later, or the heating process after solidifying by irradiating ultraviolet rays. It depends on the degree of vacuum when forming the plating layer. The heat treatment of the present invention consists of treatment at a temperature of 60 to 200°C for about 1 to 15 minutes.

Regarding the relationship between heating temperature and time, when the temperature is low, a long time is required, and when the temperature is high, a short time is required.
Therefore, although there is no intention to uniformly limit the time and temperature, low-temperature and short-time heat treatment is desirable from the viewpoint of saving thermal energy and production efficiency. Furthermore, without being bound by theory, it is believed that this heat treatment mainly involves the dissipation of residual monomers as described above, and also includes partial polymerization and further prevention of moisture absorption in the coating film after heat treatment.

Furthermore, considering this, it is understood that it is preferable to perform the process immediately before vacuum deposition or sputtering. The equipment heat source for the heat treatment may be a commonly known method.

For example, any one of an infrared lamp, kerosene, heavy oil, propane gas, combustion gas such as city gas, and a gas heater may be used. This heat treatment significantly improves the heat resistance of the metal plated body and also significantly improves the adhesion between the bare metal surface and the base coat layer. In the method of the present invention, a metal plating layer of about 1 micron or less in thickness made of metals such as aluminum, chromium, nickel, copper, and alloys thereof is then applied to the surface of the base coat layer by vacuum evaporation or sputtering. Form.

The thus obtained product, a metal plating body, has excellent heat resistance, and does not exhibit multicolored rainbow patterns, wrinkles, cracks, etc. even when heated. On the other hand, the degree of vacuum in conventional vacuum evaporation plating is generally about 3 x 10-4 to 7 x 10-5T0rr, but at this degree of vacuum, residual polymerization in the base coat layer It has no effect on monomer removal.

It is presumed that by maintaining the base coat layer under a high degree of vacuum as in the present invention, there is an effect of suctioning and removing a small amount of the polymerizable monomer remaining in the base coat layer, and thus the surface of the base coat layer from which the remaining polymerizable monomer has been removed. A metal plating layer applied to the base coat layer is extremely effective in significantly improving the mutual adhesion between the base coat layer and the metal plating layer.

The metal-plated body thus obtained has extremely excellent heat resistance, with no multicolored rainbow patterns, wrinkles, cracks, etc. observed even when heated. Since the metal plating layer of the metal plating body obtained by the method of the present invention is an extremely thin film, for the purpose of protecting the plating layer and preventing surface contamination 1E,
A thermosetting resin liquid of the same kind as that used for the primer coat is applied to the surface of the metal plating layer and heated under the conditions necessary to solidify, or the resin liquid used for the base coat layer is applied and the resin liquid used for the base coat layer is applied. A surface protective layer can be formed by irradiating active energy using ionizing radiation and/or electromagnetic waves as an energy source to solidify it, or by applying an acrylic resin, epoxy resin, polyurethane resin liquid, etc. and curing it at room temperature. It is also possible to provide
Next, specific effects of the present invention will be explained by giving examples.

"Part" or "%" indicates [part by weight] or "% by weight."
[Adjustment of resin liquid for primer coat layer] (1) Resin liquid for primer coat layer A-1 The viscosity was adjusted using a mixed solvent prepared by mixing the above composition in a ratio of Solbetsuso #100:Butyl Cellosolve = 90:10 parts by weight (Food Cup #1). 4 (measured viscosity 30 seconds) was designated as primer coat layer resin liquid A-1.

2) Resin liquid A-2 for primer coat layer The viscosity of the composition was adjusted in the same manner as A-1. This was prepared as resin liquid A-2 for primer coat layer.

The viscosity of the composition was adjusted in the same manner as A-1 to obtain primer coat layer resin liquid A-3.

The viscosity of the above composition was adjusted using butyl alcohol (viscosity measured by food cup #4 for 40 seconds) and used as primer coat layer resin liquid A-4.

The viscosity of the above composition was adjusted using butyl cellosolve (viscosity measured by Ford Cup #4 for 40 seconds), and the resulting composition was used as resin liquid A-5 for primer coat layer.

The resin liquid A-1 was spray-painted on the surface of a cold-rolled steel sheet that had been polished and cleaned, to a dry film thickness of 20 microns, and was applied at room temperature for 2 hours.
After setting for 0 minutes, it was left in a hot air oven at 150° C. for 20 minutes to solidify and obtain a primer coat layer.

Next, resin liquid B-1 was spray-coated on the primer coat layer to a dry film thickness of 20 microns, and the coating was applied for 10 minutes at room temperature.
After setting for a minute, irradiation was performed for 60 seconds at an irradiation distance of 20 CTIL using one high-pressure mercury lamp with a lamp power of 80 W/CIL to obtain a base coat layer. Next, an aluminum plating layer having a thickness of 500λ was formed on the surface of the base coat layer by vacuum evaporation at a vacuum degree of 1×10 −5 T0rr to obtain a metal plating body. Example 2 [Resin liquid B-2 for base coat layer] The resin liquid A-2 was spray-coated onto the surface of a cold-rolled steel sheet that had been polished and cleaned so that the dry film thickness was 20 microns, and the coating was applied at room temperature for 2 hours.
After setting for 0 minutes, it was left to stand in a hot air oven at 130°C for 30 minutes to solidify, thereby obtaining a primer coat layer.

Next, resin liquid B-2 was spray-coated on the primer coat layer to a dry film thickness of 20 microns, and after setting in a hot air drying oven at 50°C for 5 minutes, the lamp power was 80W.
/CTrL high pressure mercury lamp irradiation distance 20cr
A base coat layer was obtained by irradiating at fL for 60 seconds. Next, the surface of the base coat layer is coated with a vacuum degree of 3×10 using a vacuum evaporation method.
An aluminum plating layer of 500 layers was formed under the condition of -6T0rr to obtain a metal plating body. Example 3 The resin liquid A-4 was spray-painted on the surface of a cold-rolled steel sheet that had been polished and cleaned so that the dry film thickness was 20 microns, and the coating was applied for 30 minutes at room temperature.
After setting for 0 minutes, it was left to stand in a hot air oven at 120°C for 30 minutes to solidify, thereby obtaining a primer coat layer.

Next, resin liquid B-3 was spray-coated on the primer coat layer to a dry film thickness of 30 microns, and the coating was applied for 1 hour at room temperature.
After setting for 0 minutes, irradiation distance is 20? with one high pressure mercury lamp with lamp input 160W/Cln. was irradiated for 30 seconds to obtain a base coat layer. Next, an aluminum plating layer of 500 layers was formed on the surface of the base coat layer by vacuum evaporation at a vacuum degree of 5×10 −6 T0rr to obtain a metal plating body. The resin liquid A-5 was spray-painted on the surface of a cold-rolled steel sheet that had been polished and cleaned to a dry film thickness of 20 microns, and after setting at room temperature for 20 minutes, it was left in a hot air oven at 180 ° C. for 30 minutes to solidify. A primer coat layer was obtained.

Next, resin liquid B-4 was applied on the primer coat layer to a dry film thickness of 30. After spray painting to a micron density and setting it at room temperature for 10 minutes, the lamp input power is 160W/(177W).
Irradiation distance is 20 with one high-pressure mercury lamp (: 3 at 7n).
Irradiation was performed for 0 seconds to obtain a base coat layer. Next, heat treatment was performed at 150°C for 3 minutes in a hot air drying oven, and immediately vacuum evaporation was performed at a vacuum degree of 1X10-4T0rr.
An aluminum metal film was obtained. Example 5 The resin liquid A-3 was spray-painted on the surface of a polished and cleaned cold-rolled steel sheet to a dry film thickness of 20 microns, and after setting at room temperature for 20 minutes, it was left in a hot air oven at 200°C for 20 minutes. The mixture was solidified to obtain a primer coat layer.

Next, resin liquid B-5 was spray-coated on the primer coat layer to a dry film thickness of 20 microns, and 50'C×
After setting for 10 minutes, irradiation was performed for 60 seconds at an irradiation distance of 20 CTrL using one high-pressure mercury lamp with a lamp input of 80 W/O to obtain a base coat layer. Next, in a hot air drying oven, 1
Immediately after heat treatment at 00°C for 10 minutes, the degree of vacuum is 1.
Vacuum deposition was performed under the conditions of x10-4T0rr to obtain a 500mm aluminum metal film. Example 6 The resin liquid A-4 was applied to the surface of a polished and cleaned cold rolled steel plate,
Spray paint to a dry film thickness of 30 microns, set at room temperature for 30 minutes, and then heat in a hot air oven at 130℃ for 15 minutes.
The mixture was left to stand for a minute to solidify to obtain a primer coat layer.

Next, resin liquid B-6 was spray-coated on the primer coat layer to a dry film thickness of 30 microns, and then coated at room temperature for 1 hour.
After setting for 0 minutes, irradiation was performed for 60 seconds at an irradiation distance of 20 cm using one high-pressure mercury lamp with a lamp input of 80 W/Cm to obtain a base coat layer. Next, dry in a hot air drying oven at 80℃
After 5 minutes of heat treatment, immediately reduce the vacuum to 1 x 10-4.
An aluminum metal film of 500 was obtained by vacuum deposition at T0rr. Comparative Example 1 A primer coat layer and a base coat layer were obtained using a resin liquid having the same composition as in Example 1 and using the same procedure.

Next, the surface of the base coat layer is coated with a vacuum degree of 1 using a vacuum evaporation method.
An aluminum layer of 500λ was formed under the conditions of ×10 −4 T0rr to obtain a metal-plated body. Comparative Example 2 A primer coat layer and a base coat layer were obtained using a resin liquid having the same composition as in Example 2 and using the same procedure.

Next, the surface of the base coat layer is coated with a vacuum degree of 5 using a vacuum deposition method.
A metal-plated body was obtained by forming 500 aluminum layers under the conditions of x10-5T0rr. Comparative Example 3 A primer coat layer and a base coat layer were obtained using a resin liquid having the same composition as in Example 3 and using the same procedure.

Next, an aluminum layer of 500 λ was formed on the surface of the base coat layer by vacuum evaporation at a vacuum degree of 7×10 −5 T0 rr to obtain a metal-plated body. Comparative Example 4 A primer coat layer and a base coat layer were obtained using a resin liquid having the same composition as in Example 4 and using the same procedure.

Next, vacuum evaporation was performed under the same conditions as in Example 4 without heat treatment to obtain an aluminum metal film. Comparative Example 5 A primer coat layer and a base coat layer were obtained using a resin liquid having the same composition as in Example 5 and using the same procedure.

Next, vacuum evaporation was performed under the same conditions as in Example 5 without heat treatment to obtain an aluminum metal film. Comparative Example 6 A primer coat layer and a base coat layer were obtained using a resin liquid having the same composition as in Example 6 and using the same procedure.

Next, vacuum evaporation was performed under the same conditions as in Example 6 without heat treatment to obtain an aluminum metal film. The results of comparative evaluation of the effects using the metal plated bodies obtained in Examples 1 to 6 and Comparative Examples 1 to 6 are as follows.

It is clear from the comparative test results table that the test specimens obtained by the method of the present invention are excellent in appearance, heat resistance, and adhesion. Very useful as a reflector.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a metal-plated body in which a UV-curable base coat paint is applied to a metal surface and cured by UV irradiation, and then metal plating is applied thereon, comprising: (a) before applying the base coat paint; After applying a thermosetting resin liquid onto a metal material and curing it by heating to obtain a primer coat layer, a resin liquid having at least one unsaturated group in the molecule is applied onto the layer. (b) Immediately before metal plating is performed on the base coat layer by vacuum evaporation or sputtering, plating is performed at 60 to 200°C for 1 to 15 minutes. A method for producing a metal-plated body, the method comprising heat-treating for a minute. 2. The resin liquid having at least one unsaturated group in the molecule is (meth)acryloyl based on 50% to 90% by weight of the polymer and/or oligomer of the epoxy-modified acrylic resin and/or polyester-modified acrylic resin. Group-containing polymerizable monomer 50% to 10% by weight
2. The method of manufacturing a metal plated body according to claim 1, wherein the metal plated body is a mixture of the following. 3. The method for manufacturing a metal plated body according to claim 1, wherein the metal plate layer is made of aluminum or an alloy thereof. 4. In a method for manufacturing a metal plated body in which an ultraviolet curable base coat paint is applied to a metal surface, cured by ultraviolet irradiation, and then metal plated thereon, (a) before applying the base coat paint, After applying a thermosetting resin liquid and curing with heating to obtain a primer coat layer, a resin liquid having at least one unsaturated group in the molecule is applied onto the layer, and ultraviolet rays are irradiated. (b) metal plating is performed on the base coat layer by a vacuum evaporation method at a vacuum degree of 1 x 10^-^5 Torr or more. Production method. 5 The resin liquid having at least one unsaturated group in the molecule is (meth)acryloyl based on 50% to 90% by weight of the polymer and/or oligomer of the epoxy-modified acrylic resin and/or polyester-modified acrylic resin. Group-containing polymerizable monomer 50% to 10% by weight
5. The method for manufacturing a metal plated body according to claim 4, wherein the metal plated body is a mixture of the following. 6. The method for manufacturing a metal plated body according to claim 4, wherein the metal plate layer is made of aluminum or an alloy thereof.