JPS5845083A - Electrical formation of pattern on metal - Google Patents

Abstract

PURPOSE:To form a thick or light color pattern on a metal material according to its unevenness by a method in which an uneven-surfaced metal material and an electrode palte are set in mutually facing manner with the interposition of a thin electrically insulating sheet, together with an electrolyte liquid, and then an electricity is applied between them. CONSTITUTION:A material 3 to be transferred, obtained by forming an uneven pattern 3a by an embossing process, etc., on a metal, e.g., aluminum, etc., colorable by an electrochemical method, is deoiled, washed with water, and then subjected to a primary electrolytic treatment in a 10% phosphoric acid aqueous solution to form an anodized film on the surface of the material 3. Then, the material 3 thus treated is set closely in the face of an electrode palte 4 obtained by applying nickel plating 4b on whole surface of a printed base plate 4 in an electrolyte 2, e.g., nickel sulphate, etc., having a coloring effect on metals, with the interposition of an electrically insulating and liquid- permeable material, e.g., silk cloth, etc., between them, and then an electric current is applied between them. By this, a color with concentration difference according to convexed portions 8 and concaved portions 9 is applied to the metal material due to the difference in liquid depths d1 and d2 present between the material 3 to be transferred and the electrode plate 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a colored film in an arbitrary pattern on a metal material surface WJl/c that can be colored by an electrochemical method, such as aluminum.゛The present invention provides surface K[! of metal materials that can be colored by electrochemical methods. ! The purpose is to form a pattern that is a combination of the J crystal pattern and the light and shade colored pattern.

In order to achieve this purpose, in the presence of an electrolytic solution, an electrode plate and a transfer object made of a metal material whose surface can be colored by an electrochemical method are placed in close proximity to each other, and Wc is applied between the two. A method in which an electrical insulator capable of penetrating the 'wL solution is interposed and electricity is applied to form a light pattern film on the surface of the transferred object, with dark convex portions and lightly colored concave portions. Features.

Embodiments of the method for forming electrical patterns on metal according to the present invention will be described below with reference to the accompanying drawings.

FIGS. 7 and 2 show an example of an apparatus used in the 7 method of electrically and target pattern formation on metal according to #I/Embodiment of the present invention, and 1I311I and FIG.
An example of an apparatus used in the method of forming an electrical pattern on metal according to the embodiment is shown below. , First Embodiment In FIG. 7, reference numeral 1 indicates an electrolytic tank, 2 indicates an electrolytic solution, 3 indicates an object to be transferred, and DA indicates an electrode/electrode plate 1. J is an electrical insulator, B is a weight,
7#i power supplies are shown respectively.

In this example of the apparatus, as the electrolytic solution 2, an electrolytic solution having a coloring effect on the target metal, such as an aqueous solution containing a metal salt such as nickel sulfate, is used at an appropriate temperature range.

The object to be transferred 3 is a metal 1 that can be colored by an electrochemical method, such as aluminum, and is embossed.

94 is adopted, which creates a concavo-convex pattern 3@ by pressing or etching.

As the electrode plate portion, in this embodiment, a printed circuit board with nickel plating applied to the entire surface is used.

The electrical insulator S is a thin cloth-like material having liquid permeability that allows the electrolyte to penetrate, such as silk cloth.

Nylon cloth etc. are used.

Electrolytic treatment is performed using this equipment under the following electrolytic conditions. MujO subjected to pre-treatment embossing (maximum embossing depth of 3 rin)
Degrease the sλ aluminum plate using a conventional method.

Wash with water.

Primary electrolysis (anodic oxidation) treatment (υ Kame solution 10% phosphoric acid aqueous solution <20℃) (2)
Anode The above-mentioned mu that becomes the transferred object! ;032 aluminum plate (3) Cathode 5/10O aluminum plate, (4)
Electrical Conditions A direct current of /mu/dw'' was applied for +0 minutes under the above conditions to perform primary electrolytic (anodization) treatment to form an anodized film on the surface of the Mu3032 aluminum plate, which will be the transfer target.

Secondary electrolytic treatment Here, the apparatus shown in FIG. 1 is used.

(1) Electrolyte 30971 nickel sulfate (hexahydrate) aqueous solution 111c at 20°C) (2) Transferred object - Mu5O5-aluminum plate after electrolytic treatment (a) * Electrode plate Printed circuit board with full nickel plating (4) Electrical insulator Silk cloth for silk screen (5
) heavy weight zsklI7. ixr'' (6) Current application conditions When an alternating current of λ and 4° is applied for j seconds and secondary electrolytic treatment is performed under the above conditions, the surface of the transferred object 3 is heated between the transferred object 3 and the electrode plate part. Due to the difference between the depths 4 and 4 of the electrolyte layer interposed between the convex portions l and concave portions 9 of the uneven pattern 3a and the electrode plate da, the convex portions l have better conductivity than the concave portions, and the conductivity distribution (see Figure 2)
i1).

As a result, in the uneven pattern 3 on the surface of the transfer object 3, the concave portions 9 develop a pale bronze color, and the convex portions j develop a deep bronze color.

Tertiary electrolytic treatment (1) Electrolyte 30 fl/l nickel sulfate (hexahydrate) aqueous solution 20°C (2) Counter electrode graphite plate (3) Current conditions 300 s + tA, 4” O alternating current (aOnZ) was applied for 20 seconds When the tertiary electrolytic treatment was applied under the above conditions, the shading and color tone changed, and a colored pattern with an even better design feeling was obtained.

Embodiment λ As shown in FIG. 3, a zinc letterpress plate with nickel plating having the same uneven pattern 3a as the uneven pattern 3a of the transfer target 3 was used as the electrode plate part, and other conditions were used. The first
Similar to the embodiment, when negative, secondary and tertiary electrolytic treatments are applied, the difference between the convex Hz and the concave portion 9 and the electrode plate DA is greater than that in the first embodiment, as shown in Fig. q. As the difference between the depth d and 4 of the electrolyte layer intervening becomes large, a pattern with an even sharper contrast of shading was obtained.

In addition, in the present invention, since the way in which the VC voltage is applied depends on the depth of the electrolytic solution interposed between the transferred object 3 and the electrode plate t, as described above, it is possible to apply the VC voltage continuously depending on the way in which the uneven pattern 3a is formed. It becomes possible to apply a voltage of < turns,
A colored pattern t4 of 1 to 7 tones can be obtained.

Furthermore, in the present invention, in addition to what is shown in the above embodiment as the electrode plate portion, a LiL electrode for a lazi pattern can be used.

Next, to describe the effect of the vapor chemical method on metals of the present invention, a transfer object made of a metal material that has an uneven pattern on its surface and can be colored by fC% vapor chemical method in the presence of an electrolyte. and an electrode plate are placed in close opposition to each other, and an electric insulator that allows electrolyte to permeate between the two is interposed, and electricity is applied to the surface of the transferred object to form a shading-patterned skin in which the convex portions are darkly colored and the concave portions are lightly colored. Since MMt is formed, there is an excellent effect that a composite pattern of an uneven pattern and a light and shade pattern can be obtained by a very simple pattern coloring process.

Furthermore, since the uneven pattern is applied to form a shading pattern on the transferred object, there is also the advantage that there is no risk of scratches on the pattern.

[Brief explanation of the drawing]

FIG. 7 and FIG. 3 are explanatory diagrams of the apparatus according to the lh/ and second embodiment used in the method of forming electrical patterns on metal of the present invention, and FIG. Fig. 1) is an enlarged view of part B of Fig. / ... Electrolytic tank ... Electrolyte 3 ... Transferred object 44 / ... Electrode plate j ... Electrical insulator 6 ... Heavy Weight 7...Power supply applicant Nippon Koki Co., Ltd.

Claims (1)

[Claims] 1. In the presence of an electrolytic solution, an electrolyte that allows the electrolyte to penetrate between the electrode plate and a transfer target made of a metal material whose surface can be colored by a good electrochemical method and whose surface has an uneven pattern 1. A method for forming an electrical pattern on metal, which comprises applying electricity through an insulator to form a light pattern film on the surface of the object to be transferred, in which convex portions are thicker and concave portions are lighter.