IRON-COATED PLASTIC MODEL AND METHOD OF MANUFACTURING THE SAME

Abstract

To provide a plastic model that can achieve a realistic surface state by actual iron rust or the like appearing on an iron-coated component surface and a method of manufacturing the plastic model, and a plastic model component and a method of manufacturing the plastic model component. The above-described problem is solved by a plastic model assembled using a component including a base material and at least an iron-coated layer provided on the base material as some or all components. The iron-coated layer may be provided directly on the base material, may be provided between the base material and a paint film, or may be provided as an outermost surface layer on the base material or on the paint film on the base material provided as necessary on the base material. The iron-coated layer is a pure iron-coated layer or an iron alloy-coated layer, and may contain a dispersing material.

Claims

1. A plastic model assembled using a component including a base material and at least an iron-coated layer provided on the base material as some or all components, the plastic model comprising: one or two or more areas selected from states of being provided with a paint film on a portion where rust is generated on the iron-coated layer, not being provided with a paint film on a portion where rust is generated on the iron-coated layer, being provided with a paint film on a portion where rust is not generated on the iron-coated layer, and not being provided with a paint film on a portion where rust is not generated on the iron-coated layer.

2. The plastic model according to claim 1, wherein the iron-coated layer is provided directly on the base material, the iron-coated layer is provided between the base material and the paint film, the iron-coated layer is provided as an outermost surface layer on another layer provided as necessary on the base material, the iron-coated layer is provided between another layer provided as necessary on the base material and the paint film, or the paint film is provided between the base material and the iron-coated layer.

3. The plastic model according to claim 1, wherein the iron-coated layer is a pure iron-coated layer or an iron alloy-coated layer.

4. The plastic model according to claim 1, wherein the iron-coated layer contains a dispersing material.

5. The plastic model according to claim 1, wherein the iron-coated layer is deposited by a wet deposition method, a PVD method, or a CVD method.

6. The plastic model according to claim 1, wherein a portion where rust is generated on the iron-coated layer and a portion where rust is not generated on the iron-coated layer coexist.

7. The plastic model according to claim 2, wherein the other layer is a base treatment layer, a base layer, or a metal layer.

8. A plastic model component used as some or all components of the plastic model described in claim 1, comprising: a base material; and at least an iron-coated layer provided on the base material, the plastic model component including one or two or more areas selected from states of being provided with a paint film on a portion where rust is generated on the iron-coated layer, not being provided with a paint film on a portion where rust is generated on the iron-coated layer, being provided with a paint film on a portion where rust is not generated on the iron-coated layer, and not being provided with a paint film on a portion where rust is not generated on the iron-coated layer.

9. The plastic model component according to claim 8, wherein the area is an area capable of changing over time by, in a case in which the iron-coated layer is exposed on the surface, causing natural corrosion in the iron-coated layer or increasing rust by placement in an oxidation environment, or, in a case in which the paint film is provided on the iron-coated layer, causing or increasing rust as in the real thing by a process of scraping off the paint film to expose the iron-coated layer or a process of scratching the paint film.

10. A method of manufacturing the plastic model described in claim 1, comprising: at least forming an iron-coated layer on a prepared base material to fabricate an iron-coated layer forming component; and, as necessary, applying another treatment to the iron-coated layer forming component to fabricate a plastic model component, the plastic model being assembled using the plastic model component thus fabricated as some or all components, and the plastic model thus assembled including one or two or more areas selected from states of being provided with a paint film on a portion where rust is generated on the iron-coated layer, not being provided with a paint film on a portion where rust is generated on the iron-coated layer, being provided with a paint film on a portion where rust is not generated on the iron-coated layer, and not being provided with a paint film on a portion where rust is not generated on the iron-coated layer.

11. A method of manufacturing some or all components of the plastic model described in claim 1, the method comprising: at least forming an iron-coated layer on a prepared base material, the plastic model component thus manufactured including one or two or more areas selected from states of being provided with a paint film on a portion where rust is generated on the iron-coated layer, not being provided with a paint film on a portion where rust is generated on the iron-coated layer, being provided with a paint film on a portion where rust is not generated on the iron-coated layer, and not being provided with a paint film on a portion where rust is not generated on the iron-coated layer.

12. The method of manufacturing a plastic model component according to claim 11, wherein the iron-coated layer is deposited by varying deposition conditions selected from a deposition time, a deposition temperature, a deposition composition, and the like.

13. The method of manufacturing a plastic model component according to claim 11, wherein the iron-coated layer is provided on a treated base or on a base layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a cross-sectional configuration view illustrating an example of a plastic model component according to the present invention.

[0029] FIG. 2 is cross-sectional configuration views illustrating other examples of the plastic model component according to the present invention.

[0030] FIG. 3 is cross-sectional configuration views illustrating yet other examples of the plastic model component according to the present invention.

[0031] FIGS. 4 is photographs showing an example of the plastic model according to the present invention.

[0032] FIG. 5 is photographs showing another example of the plastic model according to the present invention.

[0033] FIG. 6A is a photograph of a case in which various paint films were provided on an iron-coated layer and subsequently partially removed to expose the iron-coated layer, and FIG. 6B is an arrangement diagram illustrating positions of each paint film and the portions where the paint film was removed.

[0034] FIG. 7A is a surface photograph with the iron-coated layer provided as is, and FIG. 7B is a surface photograph after the iron-coated layer was provided and subsequently polished with a liquid metal polisher.

[0035] FIG. 8A is a surface photograph after a copper-plated layer was provided on a base material, and FIG. 8B is a surface photograph after a copper-plated layer and an iron-coated layer were sequentially provided on a base material.

[0036] FIG. 9A shows a case in which, in the plastic model, rust was generated on the iron-coated layer and, without being coated with clear paint, left in that state, and FIG. 9B shows a case in which rust was generated on the iron-coated layer and was subsequently coated with clear paint and left in that state.

[0037] FIG. 10 shows first corrosion accelerating test results of the iron-coated layer.

[0038] FIG. 11 is a continuation of the first corrosion accelerating test results shown in FIGS. 10A to 10C.

[0039] FIG. 12 shows a second corrosion accelerating test result of the iron-coated layer.

EMBODIMENTS OF THE INVENTION

[0040] A plastic model, a plastic model component, and manufacturing methods thereof according to the present invention will now be described with reference to the drawings. The present invention includes inventions having the same technical idea as that in the following embodiments and forms described in the drawings, and the technical scope of the present invention is not limited to only the descriptions of the embodiments and the descriptions of the drawings. It should be noted that, hereinafter, the plastic model component according to the present invention may be simply referred to as “model component.”

[Plastic Model and Model Component]

[0041] A plastic model 20 according to the present invention, as illustrated in FIG. 1 to FIG. 3C, is assembled using a component 10 including a base material 1 and at least an iron-coated layer 2 provided on the base material 1 as some or all components.

[0042] In such a plastic model 20, at least the iron-coated layer 2 is provided on the base material 1, making it possible to make the material have the same metal feel or iron material feel as that in the real material in terms of appearance and texture, and make the surface realistic beyond the realm of a model. As a result, it is possible to make the plastic model look like the real thing at a close distance as well, and make enthusiasts very satisfied. Further, rust can be generated or advanced as in the real thing by scraping off the paint film to expose the iron-coated layer 2, scratching the iron-coated layer 2, or the like. As a result, by causing changes over time or intentionally adding scratches to generate rust, it is possible to make it look as if changes occurred over time, and have each enthusiast create an original model. Furthermore, it is also possible to remove the existing rust and scratch new locations to generate new rust, and thus change the model to have an appearance different from the previous one, achieving the plastic model 20 that increases a great deal of fun for the enthusiast.

[0043] It should be noted that “at least” means that the iron-coated layer 2 is always provided on the base material. “Including” means that configuration other than the base material 1 and the iron-coated layer 2 may be provided as desired. “Some or all” means that the plastic model 20 may be assembled using some components 10 provided with the iron-coated layer 2, or the plastic model 20 may be assembled with all components provided with the iron-coated layer 2.

[0044] In the following, each constituent element will be described in detail.

(Base Material)

[0045] The base material 1, as illustrated in FIG. 1 and the like, constitutes the model component 10 and is the foundation on which the iron-coated layer 2 is provided. A material of the base material 1 is not particularly limited as long as a material conventionally used, and general examples include plastic base materials (also referred to as resin base materials). Examples of a plastic base material include polystyrene (PS), acrylonitrile butadiene styrene (ABS) resin, a polyolefin such as polyethylene (PE) and polypropylene (PP), vinyl chloride, acrylic resin, and the like. It should be noted that the material may be other than a plastic base material and, for example, may be a base material made of a metal (aluminum, molybdenum, stainless steel, copper, or the like), may be a base material made of a ceramic (zirconia, alumina, or the like), or may be a base material composed of any other material.

[0046] A shape of the base material 1 is determined by the portion corresponding to the component constituting the plastic model 20 to be constituted by the component. Such a shape, in the case of a general plastic base material, can be obtained by various molding methods.

(Iron-Coated Layer)

[0047] The iron-coated layer 2, as illustrated in FIG. 1 to FIG. 3C, constitutes the model component 10 and is provided on the base material 1. The iron-coated layer 2 may be provided directly on the base material 1 without another layer interposed therebetween (refer to FIG. 1), may be provided between the base material 1 and a paint film 3 (refer to FIG. 2A), may be provided as an outermost surface layer on another layer 4 provided as necessary on the base material 1 (refer to FIG. 2B), or may be provided between the other layer 4 provided as necessary on the base material 1 and the paint film 3 (refer to FIG. 2C). It should be noted that FIGS. 2A to 2C illustrate cross-sectional forms in which a film such as the iron-coated layer 2 is provided on one side of the base material 1, but the film may be provided symmetrically on both sides of the base material 1. Providing each layer symmetrically on both sides eliminates the need for masking, resulting in the advantage of superior productivity.

[0048] FIGS. 3A to 3C are cross-sectional views illustrating yet other examples. FIG. 3A illustrates a cross-sectional form in which the iron-coated layer 2 is directly provided on both sides of the base material 1. This way, the iron-coated layer 2 can be provided on both sides of the base material at the same time. FIG. 3B illustrates a cross-sectional form in which the iron-coated layer 2 is directly provided on one side of the base material 1, and the iron-coated layer 2 is directly provided on the other side as well with the paint film 3 further provided thereon. This way, it is possible to generate iron rust on the iron-coated layer 2 of the outermost surface of one side, and prevent generation of iron rust and maintain the iron surface as is on the iron-coated layer 2 of the other side provided with the paint film 3 unless intentionally scratched. FIG. 3C illustrates a cross-sectional form in which the iron-coated layer 2 is directly provided on one side of the base material 1, and the other layer 4 is directly provided on the other side. This way, the other layer 4 provided on the other side is a copper layer or a nickel layer, for example, making it possible to realize a surface with another metal color tone. By applying the forms represented in FIGS. 2A to 2C, FIGS. 3A to 3C, or the like, it is possible to provide components in which the iron-coated layer 2 is provided on the base material 1 in various modes. As a result, it is possible to provide a lineup of various types of the model component 10 and have each enthusiast create the original plastic model 20 through various innovations.

[0049] The iron-coated layer 2 is, specifically, a pure iron-coated layer or an iron alloy-coated layer. A pure iron-coated layer refers literally to one having a high purity composition of iron (99.9% or higher), and an iron alloy-coated layer refers to one obtained by alloying with other elements. Examples of the other elements include Cr, Ni, C, Si, and the like, and examples of the iron alloy-coated layers include a layer containing one or two or more of these elements, such as an FeCr alloy-coated layer, an FeNi alloy-coated layer, an FeNiCr alloy-coated layer, an FeC alloy-coated layer, and an FeSi alloy-coated layer. The content of Cr, Ni, C, Si, or the like is not particularly limited, and a desired amount can be contained for film performance corresponding to the content.

[0050] The iron-coated layer 2 may include one or two or more elements selected from P, N, W, and Mo, corresponding to formulating purpose. These P, N, W, Mo, and the like may be further included as necessary in addition to the alloy element described above. These elements are included in the iron-coated layer 2 in various forms, such as alloyed or combined with Fe. The content of the element is not particularly limited, and a desired amount can be contained for film performance corresponding to the content.

[0051] The iron-coated layer 2 may include a dispersing material. The dispersing material is not particularly limited, and examples include hard particles, magnetic particles, colored particles, roughened particles, and the like. Hard particles are used for the purpose of hardening or strengthening the iron-coated layer 2, and examples include diamond, cBN, and the like. Magnetic particles are used for the purpose of imparting further magnetic properties to the iron-coated layer 2, and examples include soft magnetic material powders such as Fe-Si-based alloys, Fe-Ni-based alloys, and Fe-Co-based alloys, ferrite powders, and the like. Colored particles are used for the purpose of changing the color tone of the iron-coated layer 2, and examples include inorganic particles such as iron (III) oxide particles, silica particles, and alumina particles, plastic particles colored with a colorant, and the like. Roughened particles are used for the purpose of roughening the surface of the iron-coated layer 2 to give it a matte feel and, for example, each of the particles described above can be used as the roughened particles. It should be noted that the content of the dispersing material is not particularly limited, and a desired amount can be contained for film performance corresponding to the content. When the dispersing material is to be contained, a particle size of the dispersing material is also selected as desired, and a dispersing material of a particle size corresponding to purpose is contained.

(Deposition of Iron-Coated Layer)

[0052] The iron-coated layer 2 is deposited by a wet deposition method, a physical vapor deposition (PVD) method, or a chemical vapor deposition (CVD) method. Wet deposition methods include electroplating, electroless plating, and the like, PVD methods include vacuum deposition, sputtering, ion plating, and the like, and CVD methods are chemical vapor deposition methods. The iron-coated layer 2 is deposited by one of these deposition methods on the basis of the characteristics of each of the methods. The properties of the obtained iron-coated layer 2 can be controlled to desired properties by depositing while varying deposition conditions selected from a deposition time, a deposition temperature, a deposition composition, and the like.

[0053] An example of depositing the iron-coated layer 2 by electroplating will be described below. In the case of deposition by electroplating, the base material 1 and other layers provided on the base material 1 must be conductive, and therefore the base material 1 having conductivity (base material made of metal) and a base film having conductivity must be provided in advance. Examples of an iron plating solution used include an iron sulfate plating solution, an iron chloride plating solution, an iron plating solution including iron sulfate and iron chloride, an iron sulfamate plating solution, and the like. Further, various supporting electrolytes and additives (leveling agents, dispersants, stress relaxing agents, surfactants, and the like) can be contained as necessary. Examples of plating conditions include current density, temperature, pH, and the like, and these conditions can be set as desired. Furthermore, the plating means may be direct current plating or may be pulse plating. A thickness of the iron-plated layer is not particularly limited and can be set as desired depending on current density, electrolysis time, and the like, and normally is preferably about 5 to 20 μm. It should be noted that the iron-plated layer can also contain carbon and, in this case, the layer preferably includes at least one type or two or more types of carboxylic acids and salts thereof, such as formic acid, acetic acid, citric acid, oxalic acid, tartaric acid, malic acid, succinic acid, and ascorbic acid. Fe3O4 (magnetite), which is an oxide layer, can also be formed on the outermost surface of the iron-plated layer. With such an oxide layer provided, there is the advantage of improving performance, such as adhesion inhibiting effects, hardening, improved wear resistance, and improved grindstone retention. This oxide layer is not essential, and thus need not be provided. The oxide layer is provided by means of anodic electrolysis, heat treatment, and black dyeing treatment of the iron-plated layer. It should be noted that, although it is not very common to form the iron-coated layer 2 by electroless plating, electroless plating may be applied in the same way as the electroplating described above.

[0054] Next, an example of depositing the iron-coated layer 2 by the PVD method will be described. Representative PVD methods include vacuum deposition, sputtering, ion plating, and the like, and can be deposited using known means corresponding to each deposition method. It should be noted that, although these methods can impart various compositions and film properties that differ from those of wet deposition, wet deposition has higher productivity and is therefore desirably adopted based on a comprehensive assessment.

[0055] It should be noted that, in the iron-coated layer 2, the content of alloy elements, the content of other elements, the content of dispersing materials, and the like can be controlled by the deposition means, the amounts of the elements and dispersing materials supplied during deposition, and the deposition conditions.

(Paint Film)

[0056] The paint film 3 is provided as desired, as necessary. The paint film 3 may be fully or partially provided on both the front and back sides of the model component 10, or may be fully or partially provided on one side, as exemplified in FIGS. 2A to 2C and FIGS. 3A to 3C. The paint film 3 may be provided on the iron-coated layer 2 or may be provided between the base material 1 and the iron-coated layer 2. It should be noted that, in a case in which the iron-coated layer 2 is provided on the paint film 3, it is preferable to perform pretreatment corresponding to the deposition means as appropriate so that the iron-coated layer 2 is readily deposited on the paint film 3.

[0057] Examples of the paint film 3 include commonly used lacquer-type paints, water-based acrylic paints, and enamel paints. These paints are formulated with additives, colorants, and the like, as desired. A viscosity can also be adjusted by formulating a dilution solvent corresponding to the paint.

[0058] The “other layer 4” may be a base treatment layer or a base layer, or may be another metal layer. The base treatment layer includes a surface of the base material 1 after having been treated for a specific purpose in correspondence with the material of the base material 1, and examples of such treatment include a smoothing treatment, a roughening treatment, a chemical conversion treatment, an impregnating treatment, an oxidizing treatment, a nitriding treatment, and the like. The base layer is another layer provided on the surface of the base material 1 for a specific purpose, and examples of the deposition method include wet plating such as electroplating and electroless plating, PVD such as vacuum deposition, sputtering, and ion plating, CVD, and the like. Specific examples include base plating with nickel, copper, or the like, metal vapor deposition layers with aluminum and the like. Such a base treatment layer or base layer is provided for the purpose of imparting gloss or non-gloss (matte) to the iron-coated layer 2, provided for improving the adhesion of the iron-coated layer 2, or provided for stress relaxation after the iron-coated layer 2 is deposited, and is not limited to these representative examples.

[0059] The other layer 4 may be a metal layer. The metal layer in this case is not applied for the same purpose as that of the base layer, and examples include a metal layer composed of Cu, Ni, Cr, or an alloy thereof, each of which exhibits a color tone different from that of the iron-coated layer 2.

[0060] The plastic model 20 is constituted by many model components 10. The model components 10 of the present invention need only be one or two or more components illustrated in FIGS. 1 to 3C, may all be the same type of the model component 10, or may be various types of the model component 10 corresponding to the area of the plastic model 20, for example. With the plastic model 20 formed with various parts, a realistic surface state can be achieved by iron rust or the like in the areas where the model component 10 according to the present invention is applied, and general plastic components may be applied as is to areas where such a surface state is not particularly required.

(Coexistence of Various States)

[0061] The plastic model 20 according to the present invention may be a model in which various states are made to coexist. Specifically, as described in the experiment examples mentioned below, a portion where rust is generated on the iron-coated layer 2 and a portion where rust is not generated on the iron-coated layer 2 may be made to coexist. By making such different portions coexist, it is possible to change the state of the rust as desired for each portion of the plastic model 20. As a result, each enthusiast can create an original model.

[0062] Further, the plastic model 20 may include one or two or more areas selected from a location in which the paint film 3 is provided on a portion where rust is generated on the iron-coated layer 2, a location in which the paint film 3 is not provided on a portion where rust is generated on the iron-coated layer 2, a location in which the paint film 3 is provided on a portion where rust is not generated on the iron-coated layer 2, and a location in which the paint film 3 is not provided on a portion where rust is not generated on the iron-coated layer 2. By thus providing various portions as desired, it is possible to change the state of the rust as desired for each portion of the plastic model 20. Furthermore, a portion where the progression of rust is stopped and a portion where the progression of rust is continued can be made to coexist. As a result, each enthusiast can create an original model.

(Manufacturing Method)

[0063] A method of manufacturing the plastic model 20 according to the present invention includes at least forming the iron-coated layer 2 on the prepared base material 1 to fabricate an iron-coated layer forming component and, as necessary, applying another treatment to the iron-coated layer forming component to fabricate the plastic model component 10, the plastic model 20 being assembled using the plastic model component 10 thus fabricated as some or all components.

[0064] The plastic model component 10 is used as some or all components of the plastic model 20, and includes the base material 1 and at least the iron-coated layer 2 provided on the base material 1, as already explained. A method of manufacturing this plastic model component 10 includes at least forming the iron-coated layer 2 on the prepared base material 1. As explained in detail in the explanatory section of the above-described “iron-coated layer,” the iron-coated layer 2 is deposited by varying the deposition conditions selected from the deposition time, the deposition temperature, the deposition composition, and the like, making it possible to change the color tone, the degree of corrosion occurrence, the degree of corrosion progression, the color tone of corrosion products, the hardness, and the like, as desired.

(Appearance of Model)

[0065] The plastic model 20 is provided with the iron-coated layer 2 on the surface thereof or below the paint film 3. When the iron-coated layer 2 is provided on the surface, unlike a metallic paint film, it is possible to make the material have the same metal feel or iron material feel as that in the real material in terms of appearance and texture, and make a realistic surface beyond the realm of a model. Further, the iron-coated layer 2 is exposed on the outer surface, making it possible to cause natural corrosion. Further, the corrosion of the iron-coated layer 2 can be advanced by dripping salt water thereon or by placing the model in an oxidation environment. Further, for corrosion that has progressed, it is also possible to stop or suppress the progression of the corrosion by applying clear paint. Furthermore, by intentionally adding scratches such as, for example, forming scratches on a model of a tank or the like and causing the scratched portion to corrode, it is possible to produce a reality such as in the real thing and bring out the originality of the enthusiast. In addition, by providing a lineup of model components 10 obtained by changing the composition of the iron-coated layer 2 as desired, it is also possible to make the outer surface not limited to the surface with red rust alone.

[0066] Further, the surface of the iron-coated layer 2 may be polished to a mirror finish. The degree of the polished finish is also not particularly limited, and any polished surface can be achieved. It should be noted that the polishing can be applied even in a case in which a metal layer is provided as the other layer 4.

[0067] It should be noted that, in a case in which the iron-coated layer 2 is provided below the paint film, the iron-coated layer 2 remains as is without changing, but can be caused to corrode by partially scraping off or scratching the paint film 3. Further, by forming the iron-coated layer 2 somewhat thicker, it is also possible to scrape off and restore a rusted location, and cause the location to corrode again to make the state different from the previous one.

[0068] The present invention makes it possible to make the plastic model look like the real thing at a close distance as well, and make enthusiasts very satisfied. The plastic model component 10 according to the present invention is most likely sold normally as a product in a “plastic model set” together with other model components for fabricating the plastic model 20 (plastic components without the iron-coated layer 2), but may be a product sold in bulk as the model component 10 including the iron-coated layer 2.

EXAMPLES

[0069] The present invention will be described in more detail below by experiments. The present invention is not limited to the content obtained in the following experiments.

[Sample 1]

[0070] As the base material 1, a plastic model component composed of degreased polystyrene resin was used. A general iron sulfate plating solution (including ferrous sulfate and citric acid monohydrate) for forming a pure iron plating film was used as a plating solution to form the iron-coated layer 2 having a thickness of approximately 10 μm on the base material 1 (refer to FIG. 1).

[Sample 2]

[0071] As the base material 1, a plastic model component composed of degreased polystyrene resin was used. An iron sulfate plating solution (including ferrous sulfate, citric acid monohydrate, and L-ascorbic acid) for forming an FeC alloy plating film was used as a plating solution to form the FeC alloy-coated layer 2 containing approximately 1 mass % carbon and having a thickness of approximately 5 μm on the base material 1.

[Sample 3]

[0072] As the base material 1, a plastic model component composed of degreased polystyrene resin was used. An iron sulfate-iron chloride plating solution (including ferrous sulfate, citric acid monohydrate, and L-ascorbic acid) for forming an FeC alloy plating film was used as a plating solution to form the FeC alloy-coated layer 2 containing approximately 0.1 mass % carbon and having a thickness of approximately 10 μm on the base material 1.

[Sample 4]

[0073] As the base material 1, a plastic model component composed of degreased polystyrene resin was used. A dispersion plating solution containing industrial diamond as a dispersant in an iron sulfate-iron chloride plating solution (including ferrous sulfate, iron chloride, citric acid monohydrate, and L-ascorbic acid) for forming an FeC alloy plating film was used as a plating solution to form the FeC alloy-coated layer 2 having a diamond volume ratio of 12.5%, containing approximately 1 mass % carbon, and having a thickness of approximately 5 μm on the base material 1.

[Samples 5 to 8]

[0074] For Sample 5, the paint film 3 was provided on the iron-coated layer 2 of Sample 1 using a water-based acrylic paint (refer to FIG. 2A). For Sample 6, the iron-coated layer 2 was provided on the base material surface of Sample 1 on a side opposite to the side provided with the iron-coated layer 2 (refer to FIG. 3A). For Sample 7, the iron-coated layer 2 was provided on the base material surface of Sample 1 on a side opposite to the side provided with the iron-coated layer 2, and the paint film 3 was further provided thereon using a water-based acrylic paint (refer to FIG. 3B). For Sample 8, a copper-plated layer was provided as the other layer 4 on the base material surface of Sample 1 on a side opposite to the side provided with the iron-coated layer 2 (refer to FIG. 3C).

Experiment Example 1

[0075] The plastic model 20, which is a tank model, was fabricated using the model component 10 of Sample 1. Photographs thereof are shown in FIGS. 4A to 4C. On the plastic model 20 shown in FIGS. 4A to 4C, a faint iron rust was formed over the entirety by natural corrosion after fabrication of the model components 10, making it possible to achieve a realistic surface state by actual iron rust.

Experiment Example 2

[0076] The plastic model 20, which is a tank model, was fabricated using the model component 10 of Sample 1. Photographs thereof are shown in FIGS. 5A to 5C. It should be noted that the plastic model 20 shown in FIG. 5A is a form obtained by partially dripping a saline solution immediately after fabrication to intentionally generate iron rust. The plastic model 20 shown in FIG. 5B is a form obtained 6 months after fabrication, and FIG. 5C is an enlarged view thereof.

Experiment Example 3

[0077] A test was conducted by providing various paint films on the iron-coated layer and subsequently partially removing the paint film to expose the iron-coated layer. FIG. 6A is a photograph of a case in which various paint films 3 were provided on the iron-coated layer 2 and subsequently partially removed to expose the iron-coated layer 2, and FIG. 6B is an arrangement diagram illustrating positions of each paint film and the portions where the paint film was removed. The sample used was obtained by using a transparent polystyrene board having a thickness of 1 mm as the base material, providing electroless copper plating (Rochelle salt bath) thereon, providing the same FeC alloy-coated layer as in Sample 2 thereon, and providing various paint films thereon.

[0078] In FIG. 6B, number 1 indicates a sprayed paint film having a milk tea beige color obtained by using ZGF Milk Tea Beige MS-41 from Musashi Holts Co., Ltd. Number 2 indicates a sprayed paint film having a transparent clear color obtained by using Transparent Clear from Nippe Home Products Co., Ltd. Number 3 indicates a brushed paint film having a milk tea beige color obtained by using ZGF Milk Tea Beige MS-41 from Musashi Holts Co., Ltd. Number 4 indicates a sprayed paint film having a burnt iron color obtained by using H-76 Burnt Iron from GSI Creos Corporation. Number 5 indicates the iron-coated layer as is without a paint film. Number 6 indicates a sprayed paint film having an olive gray color obtained by using H-48 Olive Gray (Field Gray 2) from GSI Creos Corporation. Number 7 indicates a sprayed paint film having a dark yellow color obtained by using 39 Dark Yellow from GSI Creos Corporation. It should be noted that “O” portions are portions where the paint film was provided and then removed by a solvent (acetone), “□” portions are portions where the paint film was provided and then removed by polishing (water proof abrasive paper, #320), and “Δ” portions are the polystyrene base material without a paint film.

[0079] As shown in FIGS. 6A and 6B, paint films having various colors can be provided, and each paint film can be removed by a solvent or polishing to partially expose the iron-coated layer. As a result, it is possible to provide various portions as desired, and cause and further advance corrosion in a portion in which the iron-coated layer is exposed, in particular.

Experiment Example 4

[0080] After the iron-coated layer was provided, the surface of the iron-coated layer was polished. FIG. 7A is a surface photograph with the iron-coated layer provided as is, and FIG. 7B is a surface photograph after the iron-coated layer was provided and subsequently polished with a liquid metal polisher. The sample used was obtained by using a transparent polystyrene board having a thickness of 1 mm as the base material, providing electroless copper plating (Rochelle salt bath) thereon, and providing the same FeC alloy-coated layer as in Sample 2 thereon. Polishing was carried out with a rag using a liquid metal polisher (20% alumina mineral abrasive) from Nihon Maryo Kogyo Co., Ltd.

[0081] The surface of the iron-coated layer after polishing was glossy. Such polishing can form various surface states, and cause or further advance corrosion on the surface.

Experiment Example 5

[0082] FIG. 8A is a surface photograph after a copper-plated layer was provided on a base material, and FIG. 8B is a surface photograph after a copper-plated layer and an iron-coated layer were sequentially provided on a base material. The sample used was obtained by using a transparent polystyrene board having a thickness of 1 mm as the base material, providing electroless copper plating (Rochelle salt bath) thereon, and providing the same FeC alloy-coated layer as in Sample 2 thereon.

[0083] As shown in FIGS. 8A and 8B, in a case in which the iron-coated layer is to be provided on a non-conductive base material, by providing the copper-plated layer by electroless plating after masking the entire surface or the predetermined region on the base material, or the like, the iron-coated layer can also be provided on the entire surface or in a predetermined region (region where the copper-plated layer is provided).

Experiment Example 6

[0084] FIG. 9A shows a case in which rust was generated on the iron-coated layer and, without being coated with clear paint, left in that state, and FIG. 9B shows a case in which rust was generated on the iron-coated layer and was subsequently coated with clear paint and left in that state. The sample used was obtained by using a transparent polystyrene board having a thickness of 1 mm as the base material, providing electroless copper plating (Rochelle salt bath) thereon, and providing the same FeC alloy-coated layer as in Sample 2 thereon.

[0085] As shown in FIGS. 9A and 9B, by applying clear paint in a preferred rust state, it is possible to suppress further erosion of the rust. It should be noted that, when the clear paint was applied, a slight gloss appeared.

Experiment Example 7

[0086] A first corrosion accelerating test was conducted. The sample used was obtained by using a transparent polystyrene board having a thickness of 1 mm as the base material, providing electroless copper plating (Rochelle salt bath) thereon, and providing the same FeC alloy-coated layer as in Sample 2 thereon. The test was conducted in an environment having a room temperature of 25° C. to 30° C. and a humidity of 50% to 60%.

[0087] FIG. 10A is a surface photograph of each test sample before natural corrosion, the dripping of ion exchange water, and the dripping of 5-wt % saline solution, FIG. 10B is a surface photograph of each test sample after natural corrosion, the dripping of ion exchange water, and the dripping of 5-wt % saline solution, and FIG. 10C is a surface photograph of each test sample when the dripped liquid was removed 1 hour after being dripped. Further, FIG. 11 is a continuation of the first corrosion accelerating test results shown in FIGS. 10A to 10C. The first row shows the surface photographs of each test sample before natural corrosion, the dripping of ion exchange water, and the dripping of 5-wt % saline solution (same as FIG. 10A), the second row shows the surface photographs of each test sample after being rinsed and dried 1 hour after natural corrosion, the dripping of ion exchange water, and the dripping of 5-wt % saline solution (same as FIG. 10C), the third row shows the surface photographs of each test sample 5 days thereafter, and the fourth row shows the surface photographs of each test sample 5 days thereafter (for a total of 10 days).

[0088] From the results shown in FIGS. 10A to 10C and FIG. 11, it was confirmed that, in a case in which the saline solution was dripped, the surface changed to black in color at the start of the test (after being rinsed and dried 1 hour after the dripping of 5-wt % saline solution), and gradually changed after 5 days and after 10 days. On the other hand, with the ion exchange water, even though the surface partially changed to brown in color, there were no significant changes in time series.

Experiment Example 8

[0089] A second corrosion accelerating test was conducted. In this test, because no significant change was confirmed over time in the first corrosion accelerating test described above when rinsing was performed after the dripping of the saline solution, only wiping was performed after the dripping of the saline solution. The sample used was obtained by using a transparent polystyrene board having a thickness of 1 mm as the base material, providing electroless copper plating (Rochelle salt bath) thereon, and providing the same FeC alloy-coated layer as in Sample 2 thereon. The test was conducted in an environment having a room temperature of 25° C. to 30° C. and a humidity of 50% to 60%.

[0090] FIG. 12 shows the results of the second corrosion accelerating test of the iron-coated layer. Number 1 in the figure is a surface photograph of the test sample after the iron-coated layer was provided, number 2 is a surface photograph of the test sample when the 5-wt % saline solution was dripped, number 3 is a surface photograph of the test sample after the dripped saline solution was wiped off (without rinsing and drying), and number 4 is a surface photograph of the test sample 10 days thereafter.

[0091] As shown in FIG. 12, it was confirmed that large red rust was generated after 10 days, and the degree of rust change over time can be varied.

[Summary]

[0092] As described in the above-described Experiment Examples 3 to 8, in the plastic model 20 according to the present invention, it was found that various states can be changed and changed states can be made to coexist. Specifically, it was found that, by making a portion where rust is generated on the iron-coated layer 2 and a portion where rust is not generated on the iron-coated layer 2 coexist to make different portions coexist, it is possible to change the state of the rust as desired for each portion of the plastic model 20.

[0093] Furthermore, by these experiment examples, it could be shown that a location in which the paint film 3 is provided on a portion where rust is generated on the iron-coated layer 2, a location in which the paint film 3 is not provided on a portion where rust is generated on the iron-coated layer 2, a location in which the paint film 3 is provided on a portion where rust is not generated on the iron-coated layer 2, and a location in which the paint film 3 is not provided on a portion where rust is not generated on the iron-coated layer 2 can be formed as desired. By making it possible to thus provide various portions as desired, the state of rust can be changed as desired for each portion of the plastic model 20, and portions where the progression of rust is stopped and portions where the progression of rust is varied in degree and continued can be made to coexist. As a result, each enthusiast can create an original model.

DESCRIPTIONS OF REFERENCE NUMERALS

[0094] 1 Base material [0095] 2 Iron-coated layer [0096] 3 Paint film [0097] 4 Other layer (Base layer or base treatment layer) [0098] 10 Model component [0099] 20 Plastic model