JPS63297594A - Aluminum or aluminum-alloy material and its production - Google Patents

Abstract

PURPOSE:To economically manufacture an Al material, etc., excellent in contamination resistance and having pear skin-like external appearance, by applying surface roughening treatment and then anodic oxidation treatment to the surface of an Al or Al-alloy base material and by subjecting the above to anodic electrodeposition in a coating bath containing water-soluble and water-insoluble resin contents. CONSTITUTION:The surface of an Al or Al-alloy base material is chemically, electrochemically, or mechanically roughened. Then, anodic oxidation treatment is applied to form an anodic oxidation film to a thickness, preferably, of >=about 9mum on the above surface. Subsequently, anodic electrodeposition is applied to the above base material by using a coating bath for anodic electrodeposition prepared by adding resin content of limited water solubility or water-insoluble resin content, such as PVC, to water-soluble resin content, such as acrylmelamine resin, by which a pear skin-like electrodeposited coating of <=8% 60 deg. relative-specular glossiness is formed to a thickness, preferably, of >=about 7mum on the above-mentioned anodic oxidation film. By this method, the Al or Al-alloy material in which warm, inorganic, matte-like texture is provided and die marks, etc., on the base material are covered and which has superior contamination resistance can be surely and easily obtained.

Description

[Detailed description of the invention] The present invention is used as building materials, furniture, etc., and has a unique matte texture with a satin-like, inorganic texture, and hides die marks, rolling marks, etc. The present invention also relates to an aluminum or aluminum alloy material having excellent stain resistance and a method for manufacturing the same.

Conventional techniques and problems that α attempts to solve Conventionally, as a method for forming aluminum or aluminum alloy materials having a coating film on the surface, the aluminum or aluminum alloy base material is treated by etching, etc., and then anodized treatment is performed. Generally, a method is employed in which a glossy or matte transparent coating is formed on the coating by applying the coating and then performing anodic electrodeposition using a water-soluble acrylic resin paint bath.

However, with this conventional treatment method, the aluminum or aluminum alloy material exhibits a cold, light metal texture,
It cannot give a warm, inorganic texture. Moreover, with coatings made using conventional methods, die marks and rolling marks on the substrate are easily noticeable.

In addition to having a tendency to give a feeling of unreliability, stains, fingerprints, and
There are many problems in terms of quality and performance, such as easy attachment of oil during processing.

In this case, conventional methods for giving a matte appearance and erasing die marks on the surface of aluminum or aluminum alloy substrates include mechanical pretreatment such as polishing, grinding, and blasting, satin finish, etching, etc. Surface roughening treatment methods such as chemical pretreatment are generally employed.

However, with these surface roughening treatment methods, die marks, rolling marks, etc. may still remain, and in any case,
Even if anodic oxidation is performed after surface roughening treatment and a coating film is formed thereon, there is a problem that stains such as fingerprints and oil are likely to occur.6 Therefore, aluminum or aluminum with sufficiently satisfactory quality performance Alloy materials are desired.

The present invention was made in view of the above circumstances, and is an aluminum or aluminum alloy material that provides a warm, inorganic matte texture, hides die marks and rolling marks on the base material, and has excellent stain resistance. The purpose is to provide a manufacturing method thereof.

Means and Action for Solving the Problems In order to achieve the above object, the inventors of the present invention have carried out intensive studies and have found that the surface of the aluminum or aluminum alloy base material has been subjected to surface roughening treatment, particularly by chemical or electrochemical treatment. After surface roughening treatment or mechanical surface roughening treatment, anodic oxidation treatment is performed, and then the resulting anodic oxide film is anodic electrodeposition coating in which a poorly water-soluble or water-insoluble resin component is added to the water-soluble resin component. Aluminum or aluminum alloy whose surface has been roughened by roughening treatment when a satin-like electrodeposition coating film with a 60° specular gloss of 8% or less is formed by anodic electrodeposition using a paint bath for The surface layer of the anodic oxide film applied to the foil Murakami forms a rough surface, and on this anodic oxide film, a countless number of evenly finer irregularities of about 1 to 30p are formed on the anodic oxide film. A film is obtained, and due to the combined effect of this coating film and the anodic oxide film formed on the satin-like rough surface, the transmission and scattering state of light changes significantly, and it has a unique warm, inorganic, matte texture. A composite film is obtained, and this composite film has the effect of erasing the remains of die marks, rolling marks, etc. on aluminum or aluminum alloy substrates, and also prevents stains, fingerprints, oils from processing, etc. from adhering to it. It has been found that this effect is particularly excellent when the 60'' specular gloss of the satin-like electrodeposited coating is 8% or less, and the present invention has been completed.

Therefore, the present invention provides an anodic oxide film formed on the surface of an aluminum or aluminum alloy base material whose surface has been roughened, and a satin finish having a 60° specular gloss of 8% or less on this anodic oxide film. After roughening the surface of the aluminum or aluminum alloy material and the aluminum or aluminum alloy base material, which are characterized by the formation of an electrocoated coating film, anodization treatment is performed, and then water-soluble resin is applied. Perform anodic electrodeposition using a paint bath for anodic electrodeposition coating containing a slightly water-soluble or water-insoluble resin,
The present invention provides a method for producing an aluminum or aluminum alloy material, characterized in that a satin-like electrodeposition coating film having a 60° specular gloss of 8% or less is formed.

The present invention will be explained in more detail below.

In the method for producing an aluminum or aluminum alloy material according to the present invention, first, the surface of an aluminum or aluminum alloy base material is roughened to form a satin-like rough surface.

In this case, the aluminum or aluminum alloy base material is selected depending on the application, etc., and the roughening treatment can be carried out by a conventional method, but in particular chemical or electrochemical roughening treatment or shot blasting. , mechanical roughening treatment such as sandblasting is preferably employed. These can be carried out by known methods, and examples of the treatment liquid for chemical or electrochemical surface roughening treatment and treatment materials for mechanical roughening treatment under treatment conditions 2 are as follows.

Kishu■1 Danragori (1) Treatment liquid: CuCQ, 2H, 0100g HCQ 5Q Water 5Q treatment conditions: 3
1 to 5 minutes at 0 to 50°C (2) Treatment liquid: ■ H, 0, 1 to 35ffi amount% KF C), 1 to 20 g/QN a, C
O20, 1-10 g / QNa2PO4o, t-l
o g, / Q Water Remaining ■ Sodium hydroxide 10% by weight Sodium gluconate 0.2% by weight Water
Remaining treatment conditions: 1 at 40-70℃ using ■
~5 minutes, then 1 to 5 minutes at 90°C using ■.

(3) Treatment liquid: 85% phosphorus M 75% by weight 98% sulfuric acid 25% by weight Treatment conditions: 1 to 5 minutes at 90°C (4) Treatment liquid: Sodium hydroxide 5% by weight Sodium fluoride 2% by weight Water Residual treatment Conditions: 1. at 90°C. Electrochemical surface roughening treatment for ~5 minutes (1) Treatment liquid: Salt 9 0.7~2 mol/Q Phosphoric acid 0.02~0,4 mol/Q Treatment conditions: A C10A/da'', 35~55°C (2) Processing liquid diphosphoric acid 0.02-0,4 mol/Q chelating agent 0.01 mol/Q metal ion self 0.01 mol/Q tartaric acid, citric acid, formic acid, acetic acid, etc. Processing conditions for Fe, Zn, Ti, V, etc.:
AC3A/dm", energizing for 10 minutes at room temperature (3) Treatment liquid: Hydrochloric acid 2-7.5% by weight Boric acid 1.5-4% by weight Water Remaining treatment conditions: AC4A/dm", 3-10 minutes at room temperature Electrification (4) Treatment liquid: Sulfur Wl 70% by weight Phosphoric acid 15% by weight Water 15% by weight Treatment conditions: AC2~lOA/d+++'', 80~~8
Electricity applied for 10 minutes at 5°C (1) Treated material Rainbow blasting material Average particle size 0.3 to 1.7 m (preferably 0.3 to 0.41) Hardness (HRC) 46 to 68 Types Steel grid, stainless steel grid, etc. (2) Processing material: Sandblasting material Average particle size 100 to 600 units (preferably around 200 particles) Type Inorganic particle roughening treatment method such as Alundum, treatment materials and conditions is, of course, not limited to the above-mentioned methods, treated materials, and conditions, and may be selected as appropriate depending on the texture of the target aluminum or aluminum alloy material, but in particular, if the average roughness (RZ) of the surface of the aluminum or aluminum alloy material is 20 It is preferable to select the roughened material, conditions, etc. so that the number of houses is 30 to 30.

Depending on the type of base material and its intended use, there is no problem in performing degreasing treatment, etching treatment, etc. on the aluminum or aluminum alloy base material before or after the roughening treatment, and these treatments can be carried out using normal methods. This can be done by employing

Next, in one method of the present invention, the aluminum or aluminum alloy base material whose surface has been roughened is subjected to anodic oxidation treatment to form an anodic oxide film on the surface.

Here, the anodic oxidation treatment can be carried out according to a conventional method, and specific examples include a colorless anodic oxidation method such as a sulfuric acid method, and an electrolytic coloring method using an organic acid such as oxalic acid. In addition,
The anodic oxide film is preferably formed to have a thickness of 9p or more from the viewpoint of corrosion resistance.

The surface layer of the anodic oxide film thus formed has a rough surface due to the roughening of the surface of the aluminum or aluminum alloy base material.

In addition, in the method of the present invention, the anodic oxide film can be colored by subjecting the anodic oxide film to an electrolytic coloring treatment depending on the purpose and the like. This electrolytic coloring treatment can be carried out by a conventional method, for example, by applying alternating current, direct current, or pulse waveform between the anodized film material and the counter electrode in a metal salt aqueous solution containing Ni, Go, Sn, Cu, etc. as main components. A method of electrolytically coloring the anodic oxide film using electric current may be adopted.

Further, after the anodizing treatment or further electrolytic coloring treatment, it is preferable to thoroughly wash with water, and then perform hot water washing treatment in hot water at 80° C. or higher.

In the method of the present invention, an anodic electrodeposition film is applied to the anodic oxide film formed as described above using an anodic electrodeposition paint bath capable of forming a satin-like coating film with a 60' specular gloss of 8% or less. Apply a coat of paint.

Here, as the paint bath for anodic electrodeposition coating, a paint bath is used in which a water-soluble resin component and a water-soluble or water-insoluble resin component having different compatibility with the water-soluble resin component are added.

In this case, there is no particular restriction on the water-soluble resin component, and ordinary water-soluble resin components can be used, but water-soluble acrylic melamine resins are particularly preferably used. Furthermore, the slightly water-soluble or water-insoluble resin content is not particularly limited, and examples include carboxylic acid, alkyd, acrylic-alkyd, melamine, urea, epoxy, polyurethane, polyethylene, polyamide, and polyvinyl chloride resins. One or more types of resins made of fluorine-based polymers can be used, and it is particularly preferable to use resins that differ greatly in compatibility with the water-soluble resin component, which is a paint bath component. Specifically, a paint bath made by adding such a resin component is an acrylic resin made by polymerizing methyl methacrylic acid, butyl methacrylic acid, etc. with a molecular weight of about 20,000 to 50,000, and an acrylic resin with a molecular weight of about 350 to 1,000. A modified acrylic resin paint bath, etc., in which a poorly water-soluble acrylic melamine resin with a molecular weight of 100,000 to 150,000 is added to a water-soluble acrylic melamine resin consisting of a melamine resin made by adding an appropriate trimer to monomers and dimers. can be used.

In this case, the amount of resin added is 5 to 12% by weight, especially about 10% by weight of water-soluble resin to the entire bath, and 1 to 8% by weight of poorly water-soluble or water-insoluble resin.
, particularly preferably from 1 to 5% by weight. The total resin concentration is preferably 8 to 12% by weight of the entire bath.

Further, the conditions for anodic electrodeposition coating are the same as those for normal treatment, with the object to be treated being the anode and stainless steel etc. being the cathode at 120 to 250 V, more preferably 140 to 250 V.
Apply a DC voltage of about 0 V and apply 1 at a bath temperature of 15 to 25°C.
The treatment time can be about 10 minutes, more preferably about 2 to 5 minutes, but from the viewpoint of forming the best satin-like electrodeposited coating film, a current application time of about 180 V and 3 to 4 minutes is preferable.

Furthermore, in this electrodeposition coating, the resulting satin-like electrodeposition coating film forms a coating film with a 60° specular gloss of 8% or less, more preferably 2 to 5%; The thickness is preferably 7p or more.

It is preferable that this satin-like electrodeposition coating film has a translucent milky white color, but in particular, the electrodeposition paint is poured onto the heat-resistant transparent glass surface and set.
After baking for 30 minutes at ℃, Y value (lightness) as tristimulus value
is measured, and when this Y value is used as the translucency judgment standard, the Y value of the unpainted heat-resistant transparent glass plate and the heat-resistant transparent glass plate coated with conventional transparent electrodeposition paint is 1.94, whereas the Y value is 1.94.
The type of resin added in the paint bath and the coating film thickness are appropriately adjusted so that the Y value is preferably 2 to 10, more preferably 2.5 to 5, and a translucent satin-like electrodeposition coating film is obtained. is preferred.

After the electrodeposition coating process, excess paint is washed away with water, then air-dried and dried to harden.The conditions include, for example, air-drying at room temperature for about 5 to 10 minutes,
Baking for 30 to 40 minutes at a temperature of about .degree. C. can be used to harden the material, and the optimum condition is baking at 180.degree. C. for about 30 minutes.

The satin-like electrodeposited coating film according to the present invention has countless irregularities in the form of a fine background pattern of about 1 to 301 M, particularly about 5 to 15%, formed on the surface of the coating film. It has good non-adherence and cleaning removability for stains, fingerprints, machine oil, etc., and has excellent hiding properties for die marks, rolling marks, etc. on aluminum or aluminum alloy base materials. 'A coating film with a specular gloss of 8% or less, more preferably 2 to 5%, has excellent properties.

Through the above-described treatment, an anodic oxide film is formed on the surface of the aluminum or aluminum alloy base material with a roughened surface, and a satin-like electrodeposited film is laminated and integrated on this anodic oxide film. The combined effect of the anodic oxide film formed on the rough surface of the lower layer and the coating film of the upper layer has a satin-like, warm, inorganic texture, which improves quality and performance. An excellent composite film can be obtained.

In other words, the electrodeposited coating film simply formed on the anodic oxide film in the conventional method has complete transparency whether glossy or matte, and rather takes advantage of the texture of the base. However, as in the method of the present invention, a satin-like electrodeposition coating, especially 60 ° Specular gloss is 8% or less, more preferably 2
When a coating film of ~5% is formed, the light metallic texture of the base material changes to a warm inorganic texture.

More specifically, when anodic oxidation treatment is applied to the surface of aluminum or aluminum alloy material whose surface has been roughened by roughening treatment in advance, the anodic oxide film surface not only forms a rough surface, but also this anodic oxide film The surface of the 60' specular electrodeposited coating film with a specular gloss of 8% or less is formed with countless irregularities in the form of tint marks. Due to the close contact formation of the electrodeposition coating, light is first diffusely reflected on the surface of the matte electrodeposition coating, and then the incident light is scattered again on the rough surface of the anodic oxide coating, resulting in a state of transmission and scattering of light. By visually observing the scattered light that changes significantly and is diffusely reflected on the surfaces of both layers, the light metallic texture of the base is canceled out, and a warm, inorganic textured appearance is obtained.

In addition, the satin-like coating film according to the present invention is resistant to stains, fingerprints, oils from processing, etc. and has excellent stain resistance, and even if such stains occur, they can be easily cleaned and removed. It also has the ability to erase die marks and rolling marks when forming aluminum or aluminum alloy base materials, and has excellent leveling properties. were exposed as they were in conventional coatings. Therefore, even from this point of view, it can give an ambiguous texture.

Therefore, the composite coating of the anodized coating on the rough surface and the matte electrodeposition coating according to the present invention is not only superior in appearance as described above, but also superior in coating properties to conventional composite coatings. It is something.

According to the present invention, a composite film of an anodic oxide film and a satin-like electrodeposited coating having a satin-like inorganic texture is formed on an aluminum or aluminum alloy substrate, and furthermore, this composite film is It can hide die marks, rolling marks, etc. on aluminum or aluminum alloy base materials, so it has a very good appearance, and has excellent dirt stain resistance and dirt removability, and has good film properties, so it can be used on the surface. An aluminum or aluminum alloy material with improved condition can be obtained. Therefore, the aluminum or aluminum alloy material of the present invention can be suitably used for building materials, furniture, and other uses, and according to the method of the present invention, such useful aluminum or aluminum alloy materials can be easily, reliably, and economically produced. can be manufactured.

EXAMPLES Hereinafter, the present invention will be specifically explained by showing examples and comparative examples, but the present invention is not limited to the following examples.

[Example 1] An aluminum base material was sandblasted with alundum particles having a particle size of 200 tones (average roughness 20 to 3071111
), then degreased and etched using conventional methods, and further reduced by 15%.
Current density 1-2 A/d in sulfuric acid aqueous solution (20 °C)
Direct current electrolysis was carried out for 33 to 18 minutes at m'' to form an anodic oxide film (thickness: 10 ts).

Next, after washing with hot water, using a fixing coating liquid with the following composition,
Anodic electrodeposition coating was performed using a stainless steel plate as a counter electrode under the following conditions.

Electrodeposition coating Water-soluble paint Assemblage Water-soluble acrylic resin 6% by weight Water-soluble melamine resin 4 Water M? Eleven melamine resin
2 Butyl cellosolve 3 Isopropyl alcohol 2 Triethylamine
0.15#2-ethylhexanol
0.2 〃-Water
Bokei 100.0% by weight @;
i Painting conditions Bath concentration: 12% by weight Bath temperature: 20°C Applied voltage: 160V Current application time: 90 seconds Film thickness: 10 seconds Next, thoroughly rinse with water, air dry, and heat at 180°C for 30 minutes.
A baking treatment was performed for a minute to form a composite film of an anodic oxide film and a paint film.

The composite film obtained in this way has a 60' specular gloss of 3%, an appearance consisting of a color close to white with a warm, non-glossy, inorganic texture, and no dice marks on the base material. No rolling marks were seen.

[Example 2] An aluminum base material was shot blasted with styrene steel shot having a particle size of 300 mm (average roughness of 20 to 3 mm).
0/4111), then treated in the same manner as in Example 1 to form an anodic oxide film (film thickness 10%), washed with hot water, and then subjected to AC electrolytic coloring using a nickel plate as a counter electrode under the following bath composition and conditions. death,
Painted a bronze color.

Nickel sulfate ioog/Q boric acid
4571 Magnesium sulfate 140 Tartaric acid 3 pH 5.0 Electrical treatment was carried out at AC17V, room temperature, and for 5 minutes.

Next, using the same electrodeposition coating solution as in Example 1, anodic electrodeposition coating was performed under the following conditions.

Bath concentration: 12% by weight Bath temperature: 18°C Applied voltage: 180 ■ Current application time: 120 seconds Film thickness: 14 Am Next, thoroughly wash with water, air dry, and heat at 180°C for 30
A baking treatment was performed for a minute to form a composite film.

The thus obtained composite film had a 60° specular gloss of 2%, had a brownish appearance with a dull, inorganic texture, and had no die marks or rolling marks.

[Example 3] After sandblasting an aluminum base material with alundum particles having a particle size of 100 μs (average roughness 20 to 30 p),
Treated in the same manner as in Example 1, and further treated with 100% sulfosalicylic acid.
electrolyzed at 25°C, DC3A/dm" for 20 minutes using an electrolytic coloring solution containing 5 g/Q of sulfuric acid,
A gold-colored electrolytically colored film (thickness: 18 mm) was formed, and after washing with hot water, anodic electrodeposition was applied using the same electrodeposition coating solution as in Example 1 under the following conditions.

Bath concentration: 12% by weight Bath temperature: 20℃ Applied voltage: 220V Current application time: 120 seconds Film thickness: 15 seconds Next, thoroughly rinse with water, air dry, and heat at 1.8℃ for 30 minutes.
A baking treatment was performed for 0 minutes to form a composite film.

The thus obtained composite film had a 60° specular gloss of 2%, had a yellowish appearance with a dull mineral texture, and had no die marks or rolling marks.

[Example 4] A degreased aluminum base material was chemically roughened by the following method.

Composition Sodium hydroxide 10% by weight Sodium gluconate 0.2% by weight Water
Remaining treatment conditions Temperature: 90° C. Treatment time: 5 minutes After the above treatment, neutralization treatment was performed with a 15% nitric acid aqueous solution for 2 minutes.

Next, a current density of 1 was applied in a 15% aqueous sulfuric acid solution (20°C).
, 5 A/dm'' for 30 minutes.

An anodic oxide film (13 thicknesses) was produced. Furthermore.

Using the same electrodeposition coating solution as in Example 1, anodic electrodeposition was performed under the following conditions.

Bath concentration: 12% by weight Bath temperature: 21° C. Applied voltage: 180 V Current application time: 90 seconds Film thickness: 147 m Next, baking treatment was carried out in the same manner as in Example 1 to form a composite film of an oxide film and a paint film.

The resulting composite film had a low gloss level of 2% at 60' specular gloss, had a warm inorganic texture, and had no die marks or rolling marks.

[Example 5] A degreased aluminum base material was electrochemically roughened by the following method.

Composition: Hydrochloric acid: 0,7 to 2 mol/Q Phosphoric acid: 0.02 to 0.4 mol/+2 Electrolytic conditions: Temperature: 40C A C10A/di'', electrolyzed for 10 minutes, and thoroughly washed with water.

Next, it was treated in the same manner as in Example 4 to form an anodized film (thickness: 13), and then electrolytically colored using a stainless steel plate as a counter electrode under the following bath composition and conditions to give it a bronze color.

Bath composition Nickel sulfate 100g/Q Boric acid 45 II Magnesium sulfate 140 Tartaric acid 3 pI-I 5.0 Coloring conditions Temperature 30°C AC 17°C Time 15 minutes Next, wash thoroughly with water, then hot water at 85°C for 5 minutes. Next, anodic electrodeposition was applied using the same electrodeposition coating solution as in Example 1 under the following conditions.

Bath concentration: 12% by weight Bath temperature: 18° C. Applied voltage: 160 V Current application time: 120 seconds Film thickness: 127 m Further, baking treatment was performed in the same manner as in Example 1 to form a composite film.

The composite film obtained in this way has a 60° specular gloss of 2% and low gloss (with an appearance consisting of a milky bronze color with an inorganic texture, and no die marks or rolling marks are observed. 6 [Comparative Example 1] An anodic oxide film (film thickness 9.5 Is) was produced by subjecting an aluminum base material to direct current electrolysis in a 15% sulfuric acid aqueous solution (18°C) at a current density of 1 and 2 A/dm2 for 30 minutes, After washing with water, the anodic oxide film was subjected to anodic electrodeposition coating under the following conditions in a clear electrodeposition paint bath made of ordinary acrylic melamine resin.

Bath: Paint bath containing 6% by weight of water-soluble acrylic resin, 4% by weight of water-soluble melamine resin, and other essential solvents, bath concentration: 10% by weight.Bath temperature: 20°C.Applied voltage: 150V.Electrifying time: 90 seconds.Film thickness: 10is. After washing with water and air drying, baking treatment was performed at 180° C. for 30 minutes to form a transparent coating film.

The film thus obtained has a 60° specular gloss of 98
%, it had a dark black appearance with an aluminum-like texture with a light metallic luster, and die marks and rolling marks were noticeable.

[Comparative Example 2] A degreased aluminum base material was etched with an aqueous sodium hydroxide solution, and then treated in the same manner as in Example 5 to form an anodized film (thickness: 13p). Furthermore, after washing with water, the oxide film was subjected to anodic electrodeposition coating under the following conditions in a clear electrodeposition paint bath made of a common acrylic melamine resin.

Bath Paint bath containing 6% by weight of water-soluble acrylic resin, 4% by weight of water-soluble melamine resin, and other essential solvents, bath concentration 10% by weight Bath temperature: 20°C Applied voltage: 150 ■ Current application time: 3 minutes Film thickness: 12 times, enough After washing with water and air drying, baking treatment was performed at 180° C. for 30 minutes to form a composite film.

The composite film thus obtained has a specular gloss of 90%.
It had a light metal texture, with noticeable die marks and rolling marks.

Claims (1)

[Claims] 1. An anodic oxide film is formed on the surface of an aluminum or aluminum alloy base material whose surface has been roughened, and the 60° specular gloss is 8% or less on this anodic oxide film. An aluminum or aluminum alloy material comprising a satin-like electrodeposition coating film formed thereon. 2. After roughening the surface of the aluminum or aluminum alloy base material, it is anodized, and then a paint bath for anodic electrodeposition is prepared by adding a slightly water-soluble or water-insoluble resin to the water-soluble resin. Anodic electrodeposition was performed using
A method for producing an aluminum or aluminum alloy material, characterized in that a satin-like electrodeposited coating film having a specular gloss of 8% or less is formed. 3. The manufacturing method according to claim 2, wherein the surface roughening treatment is a chemical or electrochemical surface roughening treatment. 4. The manufacturing method according to claim 2, wherein the surface roughening treatment is a mechanical surface roughening treatment.