JPH0320482A - Method for decorating clad material - Google Patents

Abstract

PURPOSE:To uniformly etch a corrosive metal to a specified depth when the metal corrosive to an etchant is etched and patterned with the etchant by cladding the metal with a metal noncorrosive to the etchant. CONSTITUTION:The surface of a sheet of Cu, etc., is etched by an etchant such as FeCl2 and patterned to decorate the surface. In this case, a sheet B of stainless steel, Ti, etc., having excellent corrosion resistance to etchant is placed on the Cu sheet A, and both sheets A and B are joined by cold rolling, hot rolling, etc., to form a clad material CM. The surface of the Cu sheet A is masked with a coating M such as ink and paint in an optional pattern. Then the clad material CM is treated with FeCl2 soln., and the part of the Cu sheet A without the mask M is etched. In this case, since the etching is stopped at the joint position with the metallic sheet B noncorrosive to the etchant, etching is performed to a specified depth, and a high quality surface-decorated material CM' is stably produced.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to pressure welding. This invention relates to a method for surface decoration of cladding materials in which a cladding material obtained by pressure welding such as salt welding is used as an etching treatment material.

PRIOR ART In general, a copper plate is often used in the above-mentioned etching tA31, and the surface of the copper plate is corroded by ferric chloride (FeCl2) or the like. A half-etching method is known in which etching is performed using '&, and the etching is stopped midway through the thickness. Problems to be Solved by the Invention However, in the above etching method, the action of the corrosive liquid on the copper plate differs depending on the location, so the etching depth is uneven.
This has the disadvantage that the etching is over- or under-etched, making it impossible to obtain a beautiful three-dimensional finish.

Therefore, it is difficult to control the processing conditions to obtain a predetermined etching depth, requiring large-scale equipment and advanced work management techniques. In general, productivity is low and there are many factors that increase costs, and not only is it not possible to handle a wide variety of products in small quantities, but as a surface decoration method, only low quality products can be obtained. The present invention relates to the above-mentioned etching process, and provides a method for surface decoration of a cladding material that has high added value and can easily obtain a high-quality etched product.

Means for Solving the Problems The present invention utilizes a pressure welding method such as a cold welding method or a warm welding method, which is known as the production method of Clasod material, to produce metals that exhibit corrosion resistance against corrosive liquids. A cladding material is formed by metal diffusion bonding with a corrosive metal, and etching is performed on the cladding material to promote etching of the corrosive metal, while using the corrosion-resistant metal as an etching stopper layer. The present invention provides a surface decoration method for cladding materials in which the etching depth is uniformly set using the above-mentioned corrosion-resistant metal. In a related invention, a cladding material is formed by metal diffusion bonding of corrosive metals into multiple layers, and this is sequentially etched with an acidic corrosive liquid and an alkaline corrosive liquid, so that the upper and lower layers are decorated by etching. The present invention provides a method for surface decoration of cladding materials that is superimposed on cladding materials.

According to the present invention, when the cladding material is subjected to an etching process, the corrosion-resistant metal functions as an etching stopper layer, and the thickness of the corrosive metal covering the surface of the cladding material is reduced to a maximum of the corrosion-resistant metal layer. Etching can be freely performed to the desired depth, and the anti-etching function of the corrosion-resistant metal allows uniform and deep etching to be achieved, resulting in high-quality surface decoration. Since the etching depth can be controlled to a constant value within the i1 corrosive metal layer, the etching operation can be managed very simply and costs can be reduced.

EXAMPLES The present invention will be explained below with reference to the drawings. 1st Example (See Figures 1 to 4) As shown in Figure 1, the surface (one side or both sides) of metal B, which exhibits corrosion resistance to the corrosive liquid used for etching treatment, is coated with the same corrosive liquid. Cold pressure welding of metal A, which is corrosive to metal.
Metal diffusion bonding is performed by applying a pressure welding method such as a warm pressure welding method to form a cladding material CM. In this cladding material, the metal atoms of the dissimilar metals are diffused and firmly bonded.

For example, a molten ferric chloride (FeCl2) is used as the corrosive liquid, stainless steel or titanium is used as the corrosion-resistant metal B, and copper is used as the corrosive metal A. As shown in FIG. 2, the surface of the cladding material CM, that is, the surface of the corrosive metal A, is masked with paint (acid-resistant paint in this case) in an arbitrary pattern, and then etched with the ferric chloride solution. Submit for processing. Corrosive metal A
When the wall is relatively thick, a spraying method is used to contact the corrosive liquid, and when the wall is relatively thin, a dipping method is used to prevent corrosion/r.
i. bring into contact with.

As shown in Figure 3, as a result of the above, the corrosive metal A on the surface layer of the cladding material CM gradually elutes in the areas where masking M is not applied, and the elution is stopped on the surface of the corrosion-resistant metal B, resulting in a uniform depth. is etched. The above-mentioned masking paint is left on the surface of the corrosive metal A that remains in a convex shape by etching treatment, or
As shown in the figure, the surface of the corrosive metal A is exposed by removing it using an organic solvent to obtain a surface decoration material CM'.

Various inks, paints, etc. can be used as the above-mentioned masking paint, and the above-mentioned masking is applied by screen printing or handwriting. Second Example (see Figure 5A) In this example, the surface decoration material CM' (Figure 4) that has been etched as described above is subjected to plating treatment or oxidation treatment that reacts only with corrosive metal A. , shows the case where the surface of corrosive metal A is covered with a plating layer or 11iP oxide.

Gold plating is a typical example of the above plating process. Apply nickel plating, etc. When the corrosion-resistant metal B is stainless steel,
A plating layer or oxide IIIP is formed only on the surface of the corrosive metal A made of copper, and no plating layer or oxide film is formed on the corrosive metal B (stainless steel), thereby coloring only the pattern etc. by the masking pattern. You can bring out the contrast between the two.

Third Example (See Figure 5B) In this example, the surface decoration material CM' (Figure 4), which has been etched as described above, is subjected to an oxidation treatment that reacts only with the corrosion-resistant metal B. A case is shown in which the surface of the corrosion-resistant metal B exposed in a concave shape by the etching process is covered with an oxide film 0.

Fourth Embodiment (See Figures 6 to 10) By applying cold or warm pressure welding, the surface of a corrosion-resistant metal, that is, a metal C that exhibits corrosion resistance against acidic corrosive liquids and alkaline corrosive liquids. ,
As a corrosive metal, an acid-corrosive metal D exhibiting corrosivity to acidic corrosion is metal diffusion bonded, and the acid-corrosive metal D
A cladding material CM shown in FIG. 6 is formed by metal diffusion bonding an alkali corrosive metal E, which is corrosive to alkaline corrosion, onto the surface of the metal. As shown in FIG. 7, a masking M is applied to the surface of the cladding material CM, that is, the surface of the alkali corrosive metal E, and then, as shown in FIG. Promotes etching of alkali corrosive metal E.
After the above etching treatment, as shown in FIG. 9, the surface of the acid corrodable metal D is masked M°, and as shown in FIG. Encourage D to carve. The etching depth of the upper alkali-corrosive gold RE is limited to the lower acid-corrosive metal D layer, and the maximum etching depth is set by the same metal layer. Further, the etching depth of the acid-corrosive metal D in the lower layer progresses up to the limit of the above-mentioned corrosion-resistant metal, that is, the acid-resistant and alkali-resistant metal C layer, and the maximum etching depth is set at the same metal layer. Although not shown, it is acid resistant in the same way as above. On the surface of the alkali-resistant metal C, an alkali-corrosive metal E is metal diffusion bonded as a corrosive metal, and the alkali-corrosive metal E
Acid-corrosive metal D, which is corrosive to acidic corrosive liquid, is metal diffusion bonded to the surface of the cladding material CM.
The cladding material CM is subjected to an etching process using the acidic corrosive compound to promote etching of the acid-corrosive metal D in the upper layer, and then subjected to an etching process using the alkaline corrosive liquid to remove the alkali-corrosive metal D in the lower layer. Promotes etching of metal E. The etching depth of the upper layer acid-corrosive metal D is set by the lower layer alkali-corrosive metal E, and the etching depth of the lower layer alkali-corrosive metal E is set by the acid-resistant metal E. They are made of alkali-resistant metal C, and are etched to a uniform depth.

After performing the multiple etching processes, the masking paint is left on the surface or removed as shown in FIG. 10 to obtain a surface decoration material CM'. According to the above, two or more layers of the alkali corrosive metal E and the acid corrosive metal D can be brought into close contact with each other and subjected to several etching treatments. Of course, the above etching process may be applied to a cladding material in which a multilayer or single layer of a corrosive metal is adhered to both sides of the metal C. The above acid resistance. The alkali-resistant metal C is stainless steel, the acid-corrosive metal D is copper, and the alkali-corrosive metal E is aluminum. Fifth Example (See Figure 11) When the alkali corrosive metal E of the surface decoration material CM' (Figure 10) obtained above is aluminum,
This is subjected to a blackening treatment, and a blackened layer F is formed on the surface of the aluminum remaining in a convex shape. According to each of the above embodiments, a cladding material made of stainless steel or titanium as a base and a combination of copper alloys such as quibronickel and copper nickel alloys, aluminum, nickel, nickel chromium, copper, etc. can be subjected to the etching process.

Incidentally, it is possible to protect the outer surface of the surface decoration material CM obtained as described above by coating it with a transparent resin.
Similarly, the present invention includes cases in which the above-mentioned surface decoration material CM' is used as a base material, and various surface treatments are performed on this material, and cases where it is combined with other objects. Effects of the Invention The present invention uses a pressure welding method such as cold pressure welding or warm pressure welding, which is known as a production method for cladding materials, to separate metals that exhibit corrosion resistance against corrosive liquids and metals that exhibit corrosivity. A cladding material is formed by metal diffusion bonding, or a cladding material is formed by metal diffusion bonding in multiple layers of an alkali corrosive metal and an acid corrosive metal as the corrosive metal, and the characteristics of this cladding material are etched. The cladding material is etched with an acidic or alkaline corrosive solution to promote etching of the corrosive metal while etching the metal that exhibits corrosion resistance against the corrosion. It functions as a stopping layer, and the etching depth can be set uniformly by using the corrosion-resistant metal. According to the present invention, by applying the cladding material as described above, it is possible to freely and reliably perform etching to a depth corresponding to the thickness of the corrosive metal within the corrosion-resistant metal layer, and The anti-etching function allows for uniform and deep etching, resulting in a more three-dimensional and aesthetically pleasing high-quality surface decoration. Since the etching depth can be controlled at a constant level within the corrosion-resistant metal layer, the etching work management and equipment are also extremely simple, making it possible to significantly reduce costs compared to the conventional half-etching method. . In addition, etching equipment can be significantly simplified compared to conventional etching equipment.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is a cross-sectional view of the cladding material, FIG. 2 is a cross-sectional view of the cladding material subjected to masking treatment, and FIG. 3 is a cross-sectional view of the cladding material subjected to etching treatment. FIG. 4 is a cross-sectional view of the cladding material (surface decoration material) with the masking paint removed. FIG. 5A is a sectional view of a cladding material (surface decoration material) subjected to plating treatment, showing a second embodiment. FIG. 5B is a cross-sectional view of a cladding material (surface decoration material) subjected to oxidation treatment, showing a third embodiment. 6 to 10 show the fourth embodiment, FIG. 6 is a sectional view of the cladding material, FIG. 7 is a sectional view of the cladding material subjected to primary masking treatment, and FIG. 8 is a sectional view of the cladding material subjected to primary etching treatment. The cross-sectional view of the material, Figure 9 is secondary masking! A cross-sectional view of the cladding material subjected to A-embedding (primary etching! A-embedding material); FIG. 10 is a cross-sectional view of the cladding material subjected to secondary etching treatment. It is a sectional view of the applied cladding material. A: Corrosive metal, B: Corrosion-resistant metal, C...
Corrosion-resistant metal with acid resistance. Alkali-resistant metal, D...Acid-corrosive metal that is a corrosive metal, E...Alkali-corrosive metal that is a corrosive metal, CM...Clad material, CM'...
-Surface decoration material, M...masking, P...plating layer or oxide film, O...oxide film, F...blackening layer.

Claims (3)

[Claims] (1) By applying the pressure welding method, a cladding material is formed by metal diffusion bonding of a corrosive metal on the surface of a metal that exhibits corrosion resistance against corrosive liquids, and the cladding material is etched with the above corrosive liquid to resistant to corrosive liquids. A method for surface decoration of a cladding material, characterized in that the etching of the metal is promoted and the etching depth of the corrosive metal is set by a corrosion-resistant metal. (2) A method for surface decoration of a cladding material, characterized in that the etched cladding material is subjected to a plating treatment that reacts only with corrosive metals, and the surface of the corrosive metals is covered with a plating layer. (3) By applying the pressure welding method, metals that are corrosive to acidic corrosive liquids (or metals that are corrosive to alkaline corrosive liquids) are coated on the surface of metals that are corrosive to acidic corrosive liquids and alkaline corrosive liquids. ) is metal diffusion bonded, and a metal that is corrosive to alkaline corrosive liquids (or a metal that is corrosive to acidic corrosive liquids) is bonded to the surface of the acid corrosive metal (or the surface of the alkali corrosive metal). Forming a cladding material by diffusion bonding, and subjecting the cladding material to etching treatment with the alkaline corrosive liquid (or acidic corrosive liquid) to promote etching of the alkali corrosive metal (or acid corrosive metal) in the upper layer, Next, etching treatment is performed using the acidic corrosive liquid (or alkaline corrosive liquid) to remove the underlying acid corrosive metal (
or alkali corrosive metal), and set the etching depth of the upper layer alkali corrosive metal (or acid corrosive metal) in the lower layer acid corrosive metal (or alkali corrosive metal), A method for surface decoration of a cladding material, characterized in that the etching depth of the acid-corrosive metal (or alkali-corrosive metal) in the lower layer is set by the acid-resistant and alkali-resistant metal.