JPS5948865B2 - Multicolor coloring method for metal surfaces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for coloring metal surfaces with various colors such as blue and golden yellow.

More specifically, Zr0 on the metal surface. forming a thin film of
This invention relates to a method of coloring various colors by controlling the film thickness. Conventionally, various methods are known for coloring metal surfaces.

For example, (1) a method of forming an oxide film in a strongly oxidizing high temperature solution, (2) a direct oxidation method, (3) a painting method, (4) an enameling method, (5) a plating method, and (6) a vapor deposition method. There are laws etc. The method of the present invention does not belong to the above-mentioned methods, in particular Z
This method uses an r-alkoxide solution and heats the compound to 200° C. or higher to cause hydrolysis and dehydration condensation reactions, thereby forming a Zr oxide film.

Zirconia oxide is a chemically very stable oxide among metal oxides, and is superior to other metal oxides such as SiO.

, Al. O. , TiO. It is more alkali resistant than
It also has excellent chemical resistance. As a result of research to obtain a glass with excellent alkali resistance, the present inventors discovered Zr0 by chemical polymerization of metal alkoxide.

glass containing SiO2-Al2O3-Z
We succeeded in making glass with rO2 composition, in this case Zr
0. It was found that the alkali resistance increased as the content of . It has these advantages.

We are currently researching the use of a film with the characteristics of
When heated above 0°C, Zr-alkoxide undergoes hydrolysis, dehydration and condensation. It has been found that a film is formed and is colored in various colors depending on the thickness of the film.
The present invention was completed based on this knowledge. In the present invention, metal plates include noble metals such as platinum, gold, and silver, metals such as iron, aluminum, nickel, stainless steel, duralumin, copper, bronze, and steel, and plates plated with metals. You can use it all.

Examples of Zr alkoxide include Zr propoxide and Zr butoxide.

As the Zr alkoxide solution, an organic solution of Zr alkoxide such as methyl alcohol, ethyl alcohol, butyl alcohol, propyl alcohol, etc. is used. The ratio of solution and Zr alkoxide is 5.1 to 20 by weight.
A range of up to 0:1 is preferred for producing multiple colors. Z
A method of applying an r-alkoxide solution to a cleaned metal surface,
Apply it to a certain thickness by spraying, dipping, etc.
The Zr alkoxide solution is left in the atmosphere for 2 to 3 minutes or more to be hydrolyzed by reaction with moisture in the atmosphere. After that 200
When heated at a temperature above .degree. C. and below the melting point of the metal, dehydration condensation occurs and a ZrO2 film is formed on the metal surface. The heating atmosphere is preferably air or an oxidizing atmosphere. In the case of a reducing atmosphere, part of the carbon of the Zr alkoxide remains in the ZIO2 film, making it difficult to obtain a good monochromatic color. Heating temperature is 200
Below ℃, the formed ZrO2 film is chemically weak;
It also has poor alkali resistance, so it is necessary to heat it to 200°C or higher. Heating time may be 5 minutes to 1 hour. When the Zr alkoxide solution is cooled or left to cool after heat treatment, a white thin film layer is formed on the surface if the Zr alkoxide solution is highly concentrated, but when this is washed off with a sponge etc., a monochromatic color such as golden yellow appears. . The thickness of the ZrO2 film can be controlled by further depositing a Zr alkoxide solution on the obtained ZrO2 film and repeating the heat treatment, or by changing the concentration of the Zr alkoxide solution.

This allows the degree and color of the coloring to be varied. According to the coloring method of the present invention, it is possible to overcome the drawbacks of the conventional vacuum evaporation method, which requires expensive equipment and can only form a film on a small area at a time. No complicated equipment or methods,
It is extremely easy to color, and since it is colored using a ZrO2 film, it has excellent effects such as coloring with excellent corrosion resistance and abrasion resistance, as well as strong adhesion to metal surfaces. can be played.

Example 1 The surface of a platinum plate was thoroughly washed with acetone, ethanol, etc., then immersed in a mixed solution of 1 part by weight of Zr propoxide (the following parts represent parts by weight) and 5 parts of ethanol, taken out and dried in the atmosphere. did.

This was placed in an electric furnace at 400°C for 5 minutes and then taken out. When the white substance adhering to the surface was removed, a monochromatic pale blue material was obtained. This colored material was added to the Z
When it was immersed in an r-propoxide solution and then treated in the same manner as described above, a golden-colored product was obtained.

These colors remained stable upon reheating to 800°C. Example 2 The surface of a stainless steel plate was thoroughly washed with alcohol, and then Z
When it was immersed in a mixed solution of 1 part of r-butoxide and 5 parts of ethanol and then treated in the same manner as in Example 1, a pale golden colored product was obtained.

When the mixed solution was replaced with a mixed solution of 1 part of Zr butoxide and 30 parts of ethanol and treated in the same manner as above, a monochromatic blue product was obtained. These formed films were in close contact with the metal surface and remained stable without peeling off even after repeated bending.

Claims (1)

[Claims] 1 After attaching the Zr alkoxide solution to the metal surface,
Hydrolyze Zr alkoxide by heating above 200℃,
A method for coloring a metal surface in multiple colors, characterized by causing a dehydration condensation reaction to form Zr oxide on the metal surface.