JP4070070B2 - Color-controlled nickel clad plate and color-tone control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses a nickel clad plate made of nickel and a base metal plate such as ordinary steel and stainless steel, which has a preferable color tone and has excellent corrosion resistance or weather resistance, and is suitable as a roof and a building material, and the color tone of the clad plate The present invention relates to a method for controlling the color tone suitable for the user.
[0002]
[Prior art]
Metal plates are used in many buildings because they are excellent in strength, fire resistance, workability, and the like. At that time, surface treatment such as chemical coloring or resin coating is often applied from the viewpoint of corrosion resistance and aesthetics. However, there are few permanent surface treatment methods for harsh outdoor environments. In order to solve this problem, the inventors disclosed in Japanese Patent No. 2592037, a nickel clad plate made of a base plate made of ordinary steel or stainless steel, which has higher strength than nickel and nickel, which has high corrosion resistance, and is heated to high temperature. A material having a nickel oxide film formed on the surface is disclosed, and has been highly evaluated for its excellent corrosion resistance and unique color tone.
[0003]
[Problems to be solved by the invention]
However, the material according to the patented invention has a problem that the color is not constant for each product, and the target color suitable for the application is not obtained. Looking at the colors so far, there are green and gray colors, which look like copper patina and are preferred by customers who imagine copper plates, while modern architecture things are gray However, it is difficult to arbitrarily produce a green or gray color system according to customer preference. An object of the present invention is to provide a method for accurately controlling the color tone of a nickel clad plate for roofing and building materials to produce green and gray colors.
[0004]
[Means for Solving the Problems]
In the present invention, the green system means a color close to copper patina, and the gray color system means a color that is dark blue and appears dark green depending on the angle of light.
By the way, when Ni oxide is purchased as a reagent, the color is green or black. The green reagent is NiO with the same number of nickel and oxygen, and the black reagent is NiO _{1 + X} with excess oxygen. Therefore, in order to make the color of nickel oxide green, it is considered that it is preferable to form an oxide in which oxygen and nickel are 1: 1.
Further, since oxides such as FeO and MnO are not green, it is considered that the green color becomes weak when mixed as an impurity. Based on these findings, the inventors conducted extensive research, and as a result, manufactured nickel plates with different amounts of impurities such as Fe and Mn, and heated to examine the color of the oxide film. It has been found that the color of the nickel oxide film tends to become gray as the amount of the material increases, and the color becomes green when the impurities are small. Specifically, the nickel oxide produced by heating at a high temperature of 600 to 1200 ° C. has a content of impurity elements (Fe, Cr, Mn, Cu, Si, Ti, etc.) in nickel of 0.1% or less. If the amount of the impurity element exceeds 0.1%, the impurity element and oxygen are combined when heated at a high temperature to form an oxide on the surface. As a result, the surface color is gray. I found out.
[0005]
That is, the configuration of the present invention is as follows.
According to the first aspect of the present invention, a clad plate in which the base material plate is plain steel or stainless steel and the laminated material is nickel having the composition described in the following (1) is heated at high temperature, and nickel is oxidized on the nickel surface by high temperature heating. It is a color control method of a nickel clad plate characterized by forming a physical film and making the surface color green.
(1) The content of the impurity element in the nickel is Fe ≦ 0.05, Cr ≦ 0.01, Mn ≦ 0.035, Cu ≦ 0.05, Si ≦ 0.05, Ti ≦ 0.01. age,
In addition, Fe + Cr + Mn + Cu + Si + Ti ≦ 0.10.
The invention according to claim 2 is a nickel clad plate having a green color tone, the color tone of which is controlled by the method according to claim 1.
Furthermore, the invention described in claim 3 is a method in which a clad plate in which the base material is ordinary steel or stainless steel and the laminated material is nickel having the composition described in the following (2) is heated at a high temperature, and the nickel surface is heated by high temperature heating. A method for controlling the color tone of a nickel clad plate, characterized in that an oxide film is formed and the surface color is gray.
(2) The content of impurity element in nickel is Fe ≦ 0.50, Cr ≦ 0.50, Mn ≦ 0.50, Cu ≦ 0.50, Si ≦ 0.50, Ti ≦ 0.50 by weight%. age,
In addition, Fe + Cr + Mn + Cu + Si + Ti> 0.10.
The invention according to claim 4 is a nickel clad plate having a gray color tone, the color tone of which is controlled by the method according to claim 3.
[0006]
Next, the reason why the content of each impurity element is limited in the present invention will be described.
When nickel containing Fe, Cr, Mn, Cu, Si, and Ti as impurities is heated at high temperature, oxides of these impurities are generated along with nickel oxide on the surface. Since these impurity oxides do not exhibit a green color, the color of the oxide generated on the nickel surface is reduced to a gray color as the impurity content in the nickel increases. In order to make the color of the surface oxide green, the impurity content (Fe + Cr + Mn + Cu + Si + Ti) in nickel must be made 0.10% or less, and the content of each impurity must be lowered individually, and the upper limit is set for each. Fe: 0.05%, Cr: 0.01%, Mn: 0.035%, Cu: 0.05%, Si: 0.05%, Ti: 0.01%.
In order to make the color of the oxide on the nickel surface gray, the impurity content in nickel (Fe + Cr + Mn + Cu + Si + Ti)> 0.10% should be satisfied. However, if there are too many individual impurities, the corrosion resistance of nickel itself Since it causes deterioration, the upper limits are Fe: 0.50%, Cr: 0.50%, Mn: 0.50%, Cu: 0.50%, Si: 0.50%, Ti: 0.50% It was.
Light elements such as Mg and Al have little influence on the color of the nickel oxide as long as they enter a trace amount as impurities.
[0007]
【Example】
A nickel / stainless steel clad was rolled to a 0.4 mm-thick thin plate using nickel containing various impurity elements as a combination material, and a heat treatment was performed at an annealing temperature of stainless steel (1050 ° C.) for 0.5 minutes. . Note that the nickel thickness is 25 μm in the state of a thin plate having a thickness of 0.4 mm. Thereafter, the color tone of the nickel oxide layer formed on the surface was measured with a color difference meter. 1 to 3 show the relationship between lightness (L), saturation (√ (a ² + b ² )), hue angle, and total content (% by weight) of Fe, Cr, Mn, Cu, Si, and Ti. . The hue angle is an angle shown in FIG. As the content of these impurity elements decreases, the brightness and saturation increase, and the hue angle decreases in the range of 90 to 180 °. That is, it turns out that green becomes strong as content of these impurity elements becomes low. It is roughly classified into two types, vivid green (□ in the figure) and strong gray (■ in the figure). As a result, it can be seen that when the total content of Fe, Cr, Mn, Cu, Si, and Ti exceeds 0.1%, the gray color becomes strong green, and below that the color becomes bright green. From this result, it is possible to control the color tone by controlling the content of Fe, Cr, Mn, Cu, Si, and Ti among the impurity elements.
[0008]
【The invention's effect】
According to the present invention, by controlling the impurity concentration in nickel, it is possible to accurately produce two types of nickel clad plates of green and gray colors, and can be expected as a new roof and building material. .
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the relationship between the brightness of a nickel oxide layer and the impurity content (% by weight) in nickel.
FIG. 2 is an explanatory diagram showing the relationship between the saturation of a nickel oxide layer and the impurity content (% by weight) in nickel.
FIG. 3 is an explanatory diagram showing a relationship between a hue angle of a nickel oxide layer and an impurity content (% by weight) in nickel.
FIG. 4 is an explanatory diagram of hue angle

Claims (4)

A clad plate whose base material is ordinary steel or stainless steel and whose laminated material is nickel having the composition described in (1) below is heated at high temperature, and a nickel oxide film is formed on the nickel surface by high temperature heating. A method for controlling the color tone of a nickel clad plate, characterized in that the green color is used.
(1) The content of the impurity element in the nickel is Fe ≦ 0.05, Cr ≦ 0.01, Mn ≦ 0.035, Cu ≦ 0.05, Si ≦ 0.05, Ti ≦ 0.01. age,
In addition, Fe + Cr + Mn + Cu + Si + Ti ≦ 0.10.   A nickel clad plate having a green color tone, the color tone being controlled by the method according to claim 1. A clad plate whose base material is plain steel or stainless steel and whose laminated material is nickel having the composition described in (2) below is heated at high temperature, and a nickel oxide film is formed on the nickel surface by high temperature heating. A method for controlling the color tone of a nickel clad plate, characterized in that a gray color system is used.
(2) The content of impurity element in nickel is Fe ≦ 0.50, Cr ≦ 0.50, Mn ≦ 0.50, Cu ≦ 0.50, Si ≦ 0.50, Ti ≦ 0.50 by weight%. age,
In addition, Fe + Cr + Mn + Cu + Si + Ti> 0.10.   A nickel clad plate having a gray color tone, the color tone being controlled by the method according to claim 3.

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