JPH02294459A - Continuous manufacture of colored zinc plate - Google Patents

Abstract

PURPOSE:To continuously manufacture the colored zinc plates without staying an oxidized colored part in a molten metal part by cooling the lower part of a mold and oxidizing the face opposed to the above. CONSTITUTION:The molten metal of which Ti, Mn, Cu, V, etc., are added to pure Zn is heated and is formed into a plate shape via a mold. The molten metal flown out into the plate shape is cooled by water cooling or the like from the lower part of the mold. The upper face of the plate shape is opened or flown with an oxidizing gas and is warmed so as not to be cooled and to solidify the lower part of the mold more rapidly. In this way, the stay of the oxidized surface in a molten metal part A and its unmoving into a solidification part B are prevented, by which colored zinc plates can continuously be obtd. Bright coloring can be obtd. with a trace amt. of about 0.1 to 5% oxygen concn. in the oxidation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a colored zinc plate. Possible methods for producing colored zinc plates include a method of manufacturing in batches or a method of manufacturing by rolling a lump, but a method of continuous mass production from molten metal is more desirable. There is. Colored zinc is produced by adding color-forming elements such as Ti, Mn, Cu, and ■ to zinc, and oxidizing the surface of the zinc alloy immediately after it is molten or solidified to develop color.

When the above-mentioned colored zinc was produced continuously, it was divided into a molten metal part and a solidified part, and the part that developed color after oxidation in the molten metal part remained in the molten metal part, resulting in the problem that the surface of the solidified part did not develop color favorably. This was especially noticeable when unidirectional solidification was performed.

As a result of intensive study of the above problems, the inventors of the present invention have determined that:
He made the following inventions.

That is, the present invention provides a continuous manufacturing method for a colored zinc plate, characterized in that the lower part of the mold is cooled, and at least a surface opposite to the above portion is oxidized, and the oxidation in the above invention is performed at O, 1 to 5.
This paper relates to a continuous method for producing colored zinc plates, which is characterized by oxidizing with a gas containing % oxygen. The zinc used in the present invention is distilled zinc ingot type I (purity 98.
5% or more), the purest zinc metal (purity 99.995% or more)
In addition, an electrolytic zinc ingot (purity of 99.99% or more) is used. For example, in the above-mentioned type 1 distilled zinc ingot, Pbl. 5% by weight or less, CdO. lffi amount% or less, and Fed,
02% by weight or less. When PB and/or Cd are not intentionally included, it is preferable to use a zinc base metal containing 1.5% by weight or less of these impurities in total. If you want to eliminate impurities as much as possible, use PB content of 0.0.
It is preferable to use the purest zinc ingot and electrolytic zinc ingot with a content of 0.05% by weight or less. The object of the present invention is that which develops color by adding certain additional elements to the above-mentioned zinc and oxidizing it.
In other words, it shows the coloring effect due to the interference of light in the oxide film. Additional elements include Ti, Mn%-Cu1V, etc. These elements may be added in an amount of 0.01 to 5.0% by weight as necessary.
Added. In the present invention, the molten metal is heated between 430 and 600°C. The color that develops differs depending on the temperature of the molten metal. The heated molten metal is formed into a flat plate through a mold, and the molten metal that flows out into a flat plate is cooled, for example, by water, from the lower part of the mold. On the other hand, the flat upper surface is either opened for oxidation or is easily cooled due to the flow of oxidizing gas, so it is heated, and the lower part of the mold is treated to solidify more quickly. This prevents the oxidized surface from staying in the molten metal part (Fig. 1A) and not transferring to the solidification part (Fig. 1B), making it impossible to obtain a colored zinc plate. A trace amount of oxygen is sufficient for the above oxidation, and a trace amount of oxygen produces a more vivid color.

For example, normal N. It is desirable to have a gas atmosphere that allows free air to enter. Therefore, the oxygen concentration is approximately 0.1 to 5%. Further, the oxidation time is about 5 seconds to 15 minutes.

The color developed also differs depending on the time.

The casting speed is desirably slow in order to achieve good unidirectional solidification, but is usually 10 to 450 mmZ.
The rate is preferably 10 to 100 wuu/min. Addition of TiO,2 to distilled zinc (Zn 9B.5wt%)
5 wt% was added, the molten metal was heated to 550°C, and a zinc plate was manufactured using the mold shown in Figure 1. As shown in Figure 1, the upper front of the mold is open in the casting direction. The open lower part of the mold is cooled,
The upper part is N.O. with an oxygen concentration of around 1%. It was oxidized with an oxidizing gas mainly composed of gases. The casting speed was IOOM/min. In addition, an opening in the mold was provided so that the oxidation time could be maintained for 3 minutes. The width of the cast plate was 150 m and the thickness was 3 m. We were able to obtain a blue colored zinc plate. (1) According to the present invention, young colored zinc plates can be continuously obtained without oxidized colored parts remaining in the molten metal part. (2) Oxygen concentration F. By oxidizing with 9-gas, it is possible to obtain colored plates with vivid colors.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a casting method that is one embodiment of the present invention.

Claims (2)

[Claims] (1) A method for continuous production of colored zinc plates, characterized by cooling the lower part of the mold and oxidizing at least the surface opposite to the above part. (2) A continuous method for producing colored zinc plates, characterized in that the oxidation in item 1 is carried out using a gas containing 0.1 to 5% oxygen.