JPH02145760A - Personal ornaments and surface finishing method - Google Patents

Abstract

PURPOSE:To easily form a high-grade elegant somber-toned metal surface with a trichromatic fine spotted pattern by plating the surface of a base material with a golden noble metal, buffing the plated surface, forming a black film and carrying out further buffing. CONSTITUTION:The surface of a metal base material for personal ornaments is plated with a golden noble metal such as a gold alloy optionally after base palting with a metal similar in color to platinum, e.g., Ni or Pd. The plated surface is buffed to form a rugged spotted pattern having the base color and gold. A black Cr plating film is then formed on the buffed surface or a black film of a TiN-TiC mixture is formed by ion plating and further buffing is carried out to obtain an elegant somber-toned metal surface with a trichromatic fine spotted pattern having the base color, gold and black.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to jewelry and accessories having an oxidized appearance, which is formed by forming the surface of a metal base material into a fine mottled pattern of silver tone, gold tone, and black tone, and the metal thereof. The present invention relates to an effective surface finishing method for substrates.

[Conventional technology and its technical issues]

Traditionally, watch cases, bracelets, tie pins.

BACKGROUND OF THE INVENTION In order to improve the appearance of accessories such as lighters and eyeglasses and increase their commercial value, the surface of the metal base material is often finished with an oxidized finish.

Many methods are known for its finishing; for example,
Precious metal plating layer on the metal base material surface of accessories.

A commonly used method is to further plate black chromium thereon, and then perform honing or buffing to remove the black chromium plating layer in spots to give it an oxidized finish. Although the oxidized finish obtained by this method has a good appearance and a sense of luxury, it is still somewhat lacking in elegance, and there is a demand for an oxidized or retro finish with a high level of elegance.

Therefore, it is an object of the present invention to provide watch cases and other accessories whose metal base material surfaces have a retro style expression that is more elegant than the conventional oxidized finish.

[Means to solve the problem]

The inventor of the present invention has conducted extensive research into prototyping methods for solving the problems mentioned above, and has developed a technique for finishing the surface of a metal base material in an oxidized finish that provides an excellent sense of luxury and elegance.

That is, the present invention provides a metal base material for accessories or a silver tone formed by base plating of the metal base, a golden tone formed by noble metal plating, a black tone formed by black chrome plating, or a mixture of titanium nitride and titanium carbide formed by ion plating. Accessories characterized by having a fine mottled pattern with a black tone of the film on the surface of a metal base material, and an effective method for forming the surface thereof, i.e., a metal base material for accessories or a base plating applied thereto. A golden-tone precious metal plating is applied to the white silver-tone metal surface, which is then buffed to form a mottled pattern, and the mottled pattern surface is plated with black chrome plating or mixed with titanium nitride and titanium carbide by ion plating. To provide a method for finishing the surface of a metal base material for jewelry, which is characterized by applying a black film and further buffing the film to form a so-called fine mottled pattern.

In the method of the present invention, the target accessories are, for example,
Watch cases, watch bands, necklaces.

Brooches, pendants, bracelets, earrings, hair pins, tie pins, lighters, glasses and other metal accessories, accessories, etc., and the metal base materials include, for example:
Typical examples include stainless steel, titanium metal, titanium-based alloys, and copper alloys such as brass.

These metals are preformed into a predetermined shape.

Typically, the surface is polished to a mirror-like shine before the method of the invention is applied.

Metal base materials for jewelry that have been formed and polished to a mirror finish may be plated directly with precious metals on the surface after normal pretreatment such as degreasing and pickling. It is possible to apply a base plating to the surface and then plate a precious metal on top of it. There are no particular restrictions on the metal for such base plating as long as it has a white silver tone color, but nickel, copper alloy, palladium, etc. are usually conveniently used. This base plating is generally formed by electroplating to a thickness of, for example, about 1 to 5 microns.

Further, examples of noble metals that provide a gold-tone plating layer on the platinum-tone metal surface include gold, gold alloys, etc., and these are preferably applied in the form of alloys having a gold tone. This plating is also formed to a layer thickness of, for example, about 1 to 5 μm by electroplating.

In the method of the present invention, the noble metal plating layer thus formed is buffed. This buffing process is performed in a random direction to form a mottled pattern of fine irregularities. A blackish coating layer of a mixed film of titanium nitride and titanium carbide is further formed on the surface with the mottled pattern obtained in this way by the commonly known black chromium plating or ion plating, and further A random buffing process is applied to create a silver tone for the base layer, a gold tone for the middle layer, and a black tone for the surface layer to form an oxidized tone with a fine mottled pattern, creating a metallic surface with a very luxurious retro look. .

In the method of the present invention, commonly known abrasives can be conveniently used as the abrasive used in the buffing process applied to form the mottled pattern. The diameter is, for example, in a range of about 74 to 125 μm. Furthermore, in the present invention, prior to buffing of the black chrome plating layer, various coating weights can be achieved by manual polishing with a special resin rod such as Scotchbrite. Therefore, in the present invention, the term "buffing treatment" includes such a method for reducing the basis weight.

In the method of the present invention, particularly when a golden metal material is used as the noble metal, an elegant oxidized metal surface with a fine mottled pattern of three colors consisting of white silver, gold, and black can be obtained.

[Effect]

The method of the present invention easily forms an oxidized metal surface with a fine mottled pattern on the three-color side, which gives a sense of luxury and more elegance that could not be obtained conventionally, on the metal base material surface of an accessory.

'[Example] Next, the method of the present invention will be explained in more detail using specific examples.

Example 1 After a watch case base material made of brass was degreased, pickled, and washed with water, a nickel plating film with a thickness of about 5 μl and a palladium plating film with a thickness of about 3 μl were sequentially formed as base plating. Gold alloy plating with a thickness of about 5 μl was further applied to the surface. Buffing treatment was performed in various directions from above this gold alloy plating to obtain a surface with a mottled pattern of gold irregularities and the base plating metal. Next, a black-toned layer of black chrome plating is formed on this surface, and it is further buffed to obtain an elegant oxidized metal surface with a fine mottled pattern of three colors: base metal, gold alloy, and black chrome. Ta.

h Note: On the male side, instead of black chrome plating, a black layer of a mixed film of titanium nitride and titanium carbide was formed by ion plating on the surface of the base plated metal and the gold uneven mottled pattern. When buffing was carried out, an elegant oxidized metal surface with a fine mottled pattern in the same three colors was obtained.

Example 2 A stainless steel watch case base material was well polished to a mirror luster, and the surface was coated with gold alloy plating with a thickness of approximately 5 μm, and this gold alloy plating was buffed in various directions. The treatment was carried out to obtain a surface with a mottled pattern of unevenness between the base metal and gold. Next, a black layer of black chrome plating is formed on this surface, and this black chrome plating layer is coated with various coating weights using Scotch Bright, etc., and then buffed to form a base stainless steel color, gold alloy, and black chrome. A metal surface with an elegant oxidized oxidation effect with a fine mottled color pattern was obtained.

〔Effect of the invention〕

According to the method of the present invention, accessories with high commercial value that have a stable and elegant oxidized silver tone, gold tone, and black tone on the surface of a metal substrate can be easily provided.

Claims (1)

[Scope of Claims] 1. Metal base material for accessories or a white silver tone by base plating of the metal base, gold tone by precious metal plating, black tone by black chrome plating, or titanium nitride and titanium carbide by ion plating. Accessories characterized by having a fine mottled pattern on the surface of a metal base material with a black tone of a mixed film. 2. Apply gold-tone precious metal plating to the metal base material for accessories or the silver-tone metal surface that has been subjected to base plating, and buff it to form a mottled pattern, and then apply black chrome plating to the mottled pattern surface. A surface finish for a metal base material for jewelry, which is characterized by applying a black tone to a mixed film of titanium nitride and titanium carbide by color tone or ion plating, and then buffing it to form a fine mottled pattern with an oxidized effect. Method.