KR20150076353A - Patterned color-magnesium and patterning method thereof - Google Patents

Abstract

The present invention relates to pattered color-magnesium and to a patterning method thereof. According to the present invention, various patterns and colors can be realized on the surface of magnesium in a short time by patterning the surface of magnesium using a masking film and immersing the same in a hydroxide solution. Therefore, the patterned color-magnesium according to the present invention can be used usefully in the fields of exterior materials of construction, interior materials of a vehicle, and particularly electrical and electronic component materials such as mobile phone case components where magnesium materials are used.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of patterning colored magnesium and a method of patterning magnesium for the same,

The present invention relates to a patterned colored magnesium and a method for patterning magnesium for the same.

Magnesium is a metal belonging to an ultra-light metal among practical metals, has excellent abrasion resistance, is strong in sunlight and environmentally friendly, but has difficulty in realizing metal texture and various colors. In addition, since it is extremely active as an electrochemically lowest metal, if it is not color-treated, it is very quickly corroded in the air or in a solution, so that it is difficult to apply to industry.

However, as the magnesium industry has been attracting attention due to the recent trend of lighter weight throughout the industry, studies have been actively conducted to improve such problems of magnesium with the trend of metal casing materials in electric and electronic parts materials such as mobile phone case parts ought.

As a result, a PVD-sol-gel method in which a metal-containing material is dry-coated and then sol-gel coated to obtain a metal texture and corrosion resistance on a magnesium alloy surface; Anodic oxidation method for imparting gloss to the magnesium surface by chemical polishing and coloring the substrate surface by anodizing the magnesium base material with the basic electrolyte in which the pigment is dissolved has been developed (Patent Documents 1 and 2).

However, in the case of the PVD-sol-gel method, a metal texture is formed on the surface of the magnesium substrate, but it is not a metal texture inherent to magnesium, and it is difficult to realize various colors. In addition, when the surface of the magnesium base material is subjected to color development treatment using the anodic oxidation method, an opaque oxide film is formed on the surface of the base material, and it is difficult to realize the metal texture inherent to magnesium.

Therefore, in order to put the magnesium into practical use, there is a desperate need for a technique of chemically, electrochemically, or physically treating the surface of the magnesium substrate to realize the color on the surface of the magnesium substrate and to introduce various patterns.

Korean Patent Publication No. 2011-0016750; Korea Patent Publication No. 2011-0134769.

It is an object of the present invention to provide a patterning method of patterned colored magnesium and magnesium for the same.

In order to achieve the above object,

Magnesium matrix; And a hydroxide film formed on the surface of the magnesium matrix,

To provide a patterned colored magnesium having a magnesium surface with a patterned structure.

In another embodiment of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: patterning a surface of magnesium with a masking film; And

And a step of immersing the patterned magnesium in the hydroxide solution.

According to the present invention, various patterns and colors can be implemented on the surface of magnesium in a short time by patterning the surface of magnesium with a masking film and immersing it in a hydroxide solution. Accordingly, the patterned colored magnesium according to the present invention can be effectively used in the field of electric and electronic parts such as building exterior materials, automobile interior, mobile phone case parts, etc., in which magnesium material is used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the structure of patterned chromogenic magnesium according to the present invention; FIG.
FIG. 2 is a schematic view showing the structure of patterned chromogenic magnesium on which a primer is performed before patterning on a magnesium surface according to the present invention; FIG.
Figure 3 is an image of the patterned chromogenic magnesium according to the present invention in one embodiment;
4 is an SEM image of a surface of a non-patterned area of patterned chromogenic magnesium in one embodiment;
FIG. 5 is a graph showing a component analysis of a chromogenic film formed on a magnesium surface immersed for 80 minutes in one embodiment; FIG.
FIG. 6 is a graph showing the composition of a chromogenic film formed on a magnesium surface immersed for 170 minutes in one embodiment; FIG.
FIG. 7 is a graph showing a component analysis of a chromogenic film formed on a magnesium surface subjected to color development for 240 minutes in one embodiment; FIG.
FIG. 8 is an image of the thickness of the hydroxide film and the surface of the magnesium film taken in accordance with the immersion time of the hydroxide solution in this embodiment. In this case, A is a graph showing the thickness of the hydroxide film taken by transmission electron microscope (TEM) Image, B is a scanning electron microscope (SEM) image of a magnesium surface;
9 is a photograph showing the color change of the patterned chromogenic magnesium according to the immersion time of the hydroxide solution in one embodiment;
10 is an image of a result of performing a cross-cut tape test method of patterned chromogenic magnesium containing a clear layer in one embodiment: wherein A is an experimental result on a specimen including a matte clear coating layer And B is the experimental result for the specimen including the glossy / matt clear coating layer.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Hereinafter, the present invention will be described in detail with reference to the drawings, and the same or corresponding components are denoted by the same reference numerals regardless of the reference numerals, and a duplicate description thereof will be omitted.

In the present specification, "%" can be used as a concentration unit of a solution. Specifically, for example, a 10% NaOH solution means a solution in which 900 mL of water and 100 g of NaOH are mixed.

The present invention provides a method of patterning a patterned chromogenic magnesium and magnesium for the same.

Conventionally, as a method of realizing patterns and colors on the surface of a magnesium material, a PVD-sol-gel method and an anodic oxidation method in which a magnesium surface is coated with a metal-containing material or a pigment are known. However, these methods may not realize the metal texture inherent to magnesium, or the durability of magnesium may deteriorate. Further, it is difficult to realize various colors, and the coating layer to be coated easily peels off, failing to satisfy the reliability.

In order to overcome these problems, the present invention proposes a method of patterning magnesium, comprising patterning a pattern on the surface of magnesium and then immersing the patterned magnesium in a hydroxide solution. According to the present invention, the method can introduce various patterns into the magnesium surface in a short time by utilizing the thickness variation of the hydroxide film that embodies the color on the magnesium surface. In addition, the present invention has an advantage in that various colors can be implemented on the magnesium surface since the hue embodied in the magnesium differs depending on the thickness of the hydroxide film formed on the surface.

Hereinafter, the present invention will be described more specifically.

In one embodiment, the present invention provides a process for preparing a magnesium alloy, comprising: a magnesium matrix; And a hydroxide film formed on the surface of the magnesium matrix,

To provide a patterned colored magnesium having a magnesium surface with a patterned structure.

FIG. 1 and FIG. 2 are schematic views showing the structure of the patterned colored magnesium according to the present invention.

Referring to FIGS. 1 and 2, the patterned chromogenic magnesium according to the present invention has a structure in which a hydroxide film 102 is laminated on a magnesium matrix 101. In the case of the patterned region 103, It can be seen that the substrate 102 is absent or its thickness is thinner than that of the non-patterned region 104. That is, it can be seen that the patterned chromogenic magnesium is patterned by the color difference due to the thickness variation of the hydroxide film 102.

At this time, the thickness of the hydroxide film 102 according to the present invention is not particularly limited, but may be specifically 50 nm to 2 占 퐉, more specifically, 100 nm to 1 占 퐉.

In addition, the patterned structure can be realized by a thickness variation of the hydroxide film 102 satisfying the following equation (1): < EMI ID = 1.0 >

[Equation 1]

5 nm ≤│T ₁ -T ₂ │ <2.0 μm

Here, T ₁ denotes an average thickness of the hydroxide film 102 of the non-patterned region 104, and T ₂ denotes an average thickness of the hydroxide film 102 of the patterned region 103.

Specifically, Equation (1) may show a deviation of the average thickness of the non-patterned region from the average thickness of the non-patterned region and the average thickness of the film of the patterned region. More specifically, the deviation of the average thickness of the hydroxide film of the non-patterned region and the patterned region may be between 5 nm and 2.0 μm. For example, the average thickness variation may be between 5 nm and 100 nm, between 50 nm and 0.5 μm, or between 0.5 and 2.0 μm. The average thickness deviation of the hydroxide film may be controlled within the range described above to derive the color difference between the non-patterned region and the patterned region. Also, due to the color difference, the pattern may be introduced on the magnesium surface.

The crystal of the hydroxide film formed on the surface of the patterned magnesium coloring according to the present invention may be formed with an average inclination angle of 30 DEG or less based on the magnesium specimen.

4 is a scanning electron microscope (SEM) image of the surface of the non-patterned region of the patterned chromogenic magnesium.

Referring to FIG. 4, it can be seen that hydroxide coating crystals are formed on the surface of the non-patterned region of the patterned chromogenic magnesium according to the present invention. At this time, it can be confirmed that the hydroxide coating crystals formed on the surface are inclined at a remarkably low angle of 30 DEG or less to the magnesium surface. In other words, it can be seen that the magnesium surface has a low inclination angle with respect to the magnesium surface, thereby making the surface flat and homogenizing.

Here, the kind of the hydroxide film according to the present invention is not particularly limited as long as it can scatter and refract light incident on the magnesium surface, and specifically may be a magnesium hydroxide.

Referring to FIGS. 5 to 7, in one embodiment, the magnesium specimen was immersed in a hydroxide solution, and after 80 minutes, 170 minutes, and 240 minutes, component analysis was performed on the hydroxide film formed on the surface. As a result, it can be seen that the hydroxide film formed on the magnesium surface is magnesium hydroxide (Mg (OH) ₂ ).

Furthermore, the patterned chromogenic magnesium according to the present invention may further include a clear layer formed on the hydroxide film.

The clear layer may further be included to improve the scratch resistance and durability of the magnesium surface. At this time, the clear coating agent for forming the clear layer is not particularly limited as long as it is a clear coating agent applicable to metal coating. More specifically, a matt clear coating agent or a glossy / matt clear coating agent applicable to a metal coating can be given.

In addition, the patterned chromogenic magnesium having the clear layer according to the present invention may have a clear layer peel ratio of 5% or less at the time of evaluation of adhesion after 72 hours of 5% salt water spray treatment at 35 ° C.

Referring to FIG. 10, a cross-cut tape test method was performed after a lapse of 72 hours after spraying 5% salt water on a patterned chromogenic magnesium containing a matte or glossy / lightless clear layer according to the present invention at 35 ° C. As a result, it can be confirmed that the area of the peeled clear layer is 5% or less as compared with the entire area of the specimen.

From these results, it can be seen that the magnesium in which the clear layer according to the present invention is formed has excellent adhesion between the patterned colored magnesium and the clear layer.

In one embodiment, the present invention provides a method of forming a mask, comprising: patterning the surface of magnesium with a masking film; And

And a step of immersing the patterned magnesium in the hydroxide solution.

Hereinafter, the method of patterning the magnesium will be described in more detail.

First, the step of patterning is a step of patterning the surface of magnesium by attaching and masking a patterned masking film on the surface of magnesium.

At this time, the type of the masking film is not particularly limited as long as it is a masking film that can be patterned on the surface of magnesium, but more specifically, a heat-releasing film capable of releasing can be used because heat can be applied in the next step of immersion.

In the method of patterning magnesium according to the present invention, before the step of patterning with a masking film,

And immersing the magnesium in the hydroxide solution.

The step of immersing is a step of immersing the surface of the magnesium on the surface of the patterned magnesium oxide to form a color on the pattern to be introduced.

More specifically, the step may be performed by dipping magnesium in a hydroxide solution before attaching the patterned masking film to the magnesium surface to form a hydroxide film on the entire magnesium surface, thereby coloring a color to be embodied in the patterning region. Thereafter, the surface of the magnesium on which the hydroxide film is formed is patterned with a masking film, and the hydroxide film is additionally formed in the non-patterned region by dipping in the hydroxide solution. Here, a hydroxide film thickness deviation between the patterned region and the non-patterned region is generated due to the hydroxide film additionally formed in the non-patterned region, and a pattern on the magnesium surface can be realized by the color difference between the patterned region and the non- . The structure of the patterned chromogenic magnesium at this time is as shown in Fig.

The immersing conditions are not particularly limited, but specifically, the magnesium substrate can be immersed in a 90 to 200 ° C, 1% to 40% hydroxide solution for 1 to 500 minutes.

Next, the step of immersing in the hydroxide solution is a step of immersing the patterned magnesium on the surface in a hydroxide solution to form a hydroxide film on the non-patterned region.

In this step, a color difference from the patterned region can be induced by forming a hydroxide film in the non-patterned region to develop color. Due to the color difference with the patterned area thus derived, the pattern can be introduced on the magnesium surface.

At this time, the hydroxide solution applicable to the hydroxide solution according to the present invention is not particularly limited as long as it is a solution containing a hydroxyl group (-OH group). More specifically, for example, a solution in which at least one member selected from the group consisting of NaOH, KOH, Mg (OH) ₂ , Ca (OH) ₂ and Ba (OH) ₂ is dissolved can be used.

In the method of patterning magnesium according to the present invention, the concentration of the hydroxide solution may be 1% to 40%, more specifically 5% to 20%. In addition, the hydroxide solution may be run at a temperature ranging from 90 占 폚 to 200 占 폚, more specifically from 100 占 폚 to 150 占 폚, and more specifically from 95 占 폚 to 110 占 폚. In addition, the immersion treatment time can be performed for 1 minute to 500 minutes, specifically 10 minutes to 90 minutes. In the range of the immersion condition of the magnesium, it is possible to realize a pattern of various colors economically on the magnesium surface.

Referring to FIGS. 8 and 9, it can be seen that the thickness of the hydroxide film formed on the magnesium surface is increased and the color developed is changed according to the immersion time of magnesium. This means that the color developed by the hydroxide film changes depending on its thickness. Therefore, it can be seen that the color developed by controlling the rate of formation of the hydroxide film on the magnesium surface can be controlled.

The method of patterning magnesium according to the present invention is characterized in that before the step of patterning the surface of magnesium with the masking film,

Electrolytic degreasing using an alkaline cleaning liquid; And

After the step of immersing the magnesium in the hydroxide solution, the step of rinsing

The method may further comprise any one or more of the following steps.

The electrolytic degreasing step is a step of electrolytically degreasing the magnesium surface with an alkaline cleaning liquid before the magnesium is immersed in the hydroxide solution, thereby cleaning the contaminants on the magnesium surface. At this time, the alkaline cleaning liquid is not particularly limited as long as it is commonly used for cleaning the surface of the metal.

In addition, the step of rinsing is a step of removing the hydroxide solution remaining on the magnesium surface by rinsing the magnesium surface after the step of immersing the magnesium in the hydroxide solution. In this step, by removing the hydroxide solution remaining on the magnesium surface, it is possible to prevent the formation of additional hydroxide film by the residual hydroxide solution.

Meanwhile, in the method of patterning magnesium according to the present invention, the step of immersing the magnesium in the hydroxide solution may include:

A first immersion step in which magnesium is immersed in a M ₁ concentration hydroxide solution; And

Magnesium, and includes a first n dipping immersing in a hydroxide solution of a concentration of M _n,

In the first and nth immersion steps, the concentration of the hydroxide solution can independently be performed in a manner that satisfies the following equations (2) and (3), and n is an integer of 2 or more and 6 or less:

&Quot; (2) &quot;

8? M ₁ ? 25

&Quot; (3) &quot;

M _n-1 -M _n &_gt; 3

In equations (2) and (3)

M ₁ and M _n denote concentration of the hydroxylated solution in each step, and the unit is%.

In the method of patterning magnesium according to the present invention, the step of immersing the magnesium in the hydroxide solution may include:

A first immersion step in which magnesium is immersed in a M ₁ concentration hydroxide solution; And

And a second immersion step in which magnesium is immersed in a M ₂ concentration hydroxide solution,

In the first and second immersion steps, the concentration of the hydroxide solution can be independently performed in a manner that satisfies the following conditions (4) to (6):

&Quot; (4) &quot;

8? M ₁ ? 25

&Quot; (5) &quot;

1.5? M _2? 15

&Quot; (6) &quot;

M ₁ -M ₂ > 5

In Equations 4 to 6,

M ₁ and M ₂ denote concentration of the hydroxide solution in each step, and the unit is%.

As described above, the step of immersing in the hydroxide solution according to the present invention can induce a color difference with the patterned region by forming a hydroxide film in the non-patterned region and coloring. At this time, the color developed on the magnesium surface can be controlled by controlling the thickness of the formed hydroxide film, and the thickness of the hydroxide film can be controlled according to the concentration of the hydroxide solution. Therefore, when the concentration of the hydroxide solution immersing the non-patterned magnesium is M ₁ to M _n , specifically M ₁ to M ₆ ; M ₁ to M ₅ ; M ₁ to M ₄ ; M ₁ to M ₃ ; Or M &_lt; ₁ &gt; to M &lt; ₂ &_gt;, and then submerged in order to control the difference in chromaticity of the realized color.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples.

However, the following Examples and Experimental Examples are merely illustrative of the present invention, and the present invention is not limited to the following Examples and Experimental Examples.

Example 1

A magnesium specimen of 4 cm x 7 cm was immersed in an alkaline cleaning solution and degreased, and a masking film was attached to the degreased specimen. Thereafter, the resultant was immersed in a 10% NaOH solution at 100 DEG C for 20 minutes, rinsed with distilled water, and then dried in a drying oven to prepare a patterned colored magnesium specimen. When the specimen was observed with naked eyes, it was confirmed that the pattern was patterned on the surface. The results are shown in Fig.

Example 2

After the masking film was first immersed in a 10% NaOH solution at 100 ° C for 40 minutes before attaching the masking film to a 4 cm x 7 cm magnesium specimen, the same procedure as in Example 1 was carried out, Magnesium specimens were prepared. A non-patterned region of the specimen was observed by scanning electron microscope (SEM) and the surface of the specimen was observed. As a result, as shown in Fig. 4, it can be confirmed that the surface of the non-patterned region has a structure in which the hydroxide film crystal is inclined to the magnesium surface at a remarkably low angle of 30 DEG or less. From this, it can be seen that the magnesium according to the present invention is homogeneous in its surface and maintains the inherent texture of magnesium without deforming its surface morphology.

Example 3

A magnesium specimen of 4 cm x 7 cm was immersed in an alkaline cleaning solution and degreased, and a masking film was attached to the degreased specimen. Thereafter, the degreased specimen was immersed in a 10% NaOH solution at 100 DEG C for 20 minutes, rinsed with distilled water, and then dried. The dried magnesium specimen was oven-dried by oven-drying at 120-150 ° C. using a liquid matt clear paint to prepare a patterned colored magnesium specimen including a matte clear layer. At this time, the thickness of the coated matt clear layer is 5 占 퐉 or less.

Example 4

A patterned colored magnesium specimen including a glossy / non-glossy clear layer was prepared in the same manner as in Example 3, except that a glossy / non-glossy clear coating agent was used in place of the matt transparent clear coating agent in Example 3 . At this time, the thickness of the coated glossy / non-glossy clear layer is 5 占 퐉 or less.

EXPERIMENTAL EXAMPLE 1. Evaluation of color development of magnesium according to immersion time of a hydroxide solution

According to the present invention, the following experiment was conducted to evaluate the degree of color development according to immersion time of magnesium hydroxide solution.

A 1 cm X 1 cm magnesium specimen was immersed in an alkaline cleaning solution and degreased. The degreased specimen was immersed in a 10% NaOH solution at 100 ° C for 240 minutes. At this time, immediately after immersing the magnesium specimen in the NaOH solution, the color of the specimen was visually evaluated at intervals of 5 to 10 minutes. In order to confirm the state of the hydroxide film formed on the surface, analysis of the surface components of the color - treated specimen, transmission electron microscope and scanning electron microscope were performed at 80 minutes, 170 minutes and 240 minutes after dipping. The results are shown in FIGS. 5 to 9.

5 to 8, it can be seen that the chromogenic film component formed on the surface of magnesium is magnesium hydroxide (Mg (OH) ₂ ), and the thickness of the film increases as the immersion time in the hydroxide solution elapses . More specifically, as a result of examining the composition of the chromogenic film on the specimen after 80 minutes, 170 minutes and 240 minutes after immersing the magnesium specimen in the hydroxide solution, the components of the chromogenic film were magnesium hydroxide (Mg (OH) ₂ ). Also, the thickness of the magnesium hydroxide film was found to increase with the passage of time to 400 nm, 700 nm and 800 nm, respectively.

Next, referring to FIG. 9, it can be seen that magnesium according to the present invention develops various colors depending on the time of immersion in the hydroxide solution. More specifically, the silver magnesium specimens not immersed in the hydroxide solution were sequentially colored with gold, red, purple, indigo and green as the immersion time elapsed, and the color developed was repeated with a constant cycle.

From this, it can be seen that the patterned colored magnesium according to the present invention is developed by the magnesium hydroxide (Mg (OH) ₂ ) coating formed through the immersion of the hydroxide solution. Also, as the immersion time passes, the thickness of the coating formed on the surface increases, and various colors can be realized by changing the thickness of the coating depending on the immersion condition.

EXPERIMENTAL EXAMPLE 2 Evaluation of Physical Properties of Patterned Colored Magnesium Containing Clear Layer

The following experiment was conducted to evaluate the physical properties of the patterned chromogenic magnesium containing the clear layer according to the present invention.

The patterned chromogenic magnesium specimens including the clear layer prepared in Example 3 and Example 4 were uniformly washed with a salt water tester (SST, Salt Spray Tester) at a salt concentration of 5% and a salt water having a temperature of 35 캜 And allowed to stand for 72 hours. Thereafter, the surface corrosion resistance of the specimen and the adhesion between the patterned colored magnesium and the clear layer were visually evaluated. At this time, the adhesion was evaluated by a cross-cut tape test method. More specifically, the coated clear layer was cut by using a knife to intersect the 6-sided horizontal lines and the 6-sided vertical lines at intervals of 1 mm. Then, the tape was firmly attached to the intersection of the horizontal line and the vertical line, and then the peeling area of the thin film with respect to the entire area of the test piece was checked when the tape was quickly removed. The results are shown in Fig.

Referring to FIG. 10, it can be seen that the patterned chromogenic magnesium containing the clear layer has excellent corrosion resistance and excellent adhesion between magnesium and the clear layer. More specifically, the specimens of Examples 3 and 4 including a matte or glossy / non-matte clear layer were visually confirmed that the specimens were salted, and that no surface deformation due to corrosion occurred after 72 hours.

As a result of evaluation of the adhesion between the patterned colored magnesium and the clear layer for the specimen on which the surface corrosion resistance test was performed, it was confirmed that the area of the clear layer peeled off to the tape was 5% or less of the total area.

It can be seen from this that the patterned chromogenic magnesium containing the clear layer has improved corrosion resistance against salt water, and the adhesion between the clear layer and magnesium is excellent.

Therefore, in the method of patterning magnesium according to the present invention, after magnesium is patterned with a masking film, the magnesium hydroxide film is uniformly formed in a non-patterned region within a short time by immersing the film in a hydroxide solution to achieve a pattern and color . In addition, magnesium produced in this manner can be uniformly realized in various colors by controlling the thickness of the hydroxide coating. Furthermore, the patterned coloring magnesium can maintain the texture of magnesium because the surface is homogeneous, and corrosion resistance can be improved at the same time.

101: Magnesium matrix
102: hydroxide film
103: patterning area
104: non-patterning area
201: Magnesium matrix
202: Hydroxide film
203: patterning area
204: non-patterning area.

Claims (16)

Magnesium matrix; And a hydroxide film formed on the surface of the magnesium matrix,
Patterned colored magnesium having a magnesium surface patterned structure.
The method according to claim 1,
Wherein the thickness of the hydroxide coating is 50 nm to 2 占 퐉.
The method according to claim 1,
Wherein the patterned structure is formed by a thickness variation of the hydroxide film satisfying the following formula (1): < EMI ID =
[Equation 1]
5 nm ≤│T ₁ -T ₂ │ <2.0 μm
In this case, T ₁ means the average thickness of the hydroxide film in the non-patterned region, and T ₂ means the average thickness of the hydroxide film in the patterned region.
The method according to claim 1,
Wherein the crystal of the hydroxide film formed on the surface of magnesium is formed with an inclination angle of 30 DEG or less on the basis of the magnesium specimen.
The method according to claim 1,
The hydroxide coating is magnesium hydroxide, patterned chromogenic magnesium.
The method according to claim 1,
A patterned colored magnesium further comprising a clear layer formed on the hydroxide film.
The method according to claim 6,
The color-developed magnesium having the clear layer formed thereon,
At the time of evaluation of adhesion after elapse of 72 hours at 35 占 폚, 5%
The patterned colored magnesium having a degree of peeling of the clear layer of 5% or less.
Patterning the surface of the magnesium with a masking film; And
And immersing the patterned magnesium in a hydroxide solution.
9. The method of claim 8,
Prior to the step of patterning with the masking film,
Further comprising the step of immersing the magnesium in a hydroxide solution.
9. The method of claim 8,
The masking film is a heat dissipating film which can be deformed.
9. The method of claim 8,
Wherein the hydroxide solution comprises at least one selected from the group consisting of NaOH, KOH, Mg (OH) ₂ , Ca (OH) ₂ and Ba (OH) ₂ .
9. The method of claim 8,
In the step of immersing the patterned magnesium in the hydroxide solution,
Wherein the concentration of the hydroxide solution is 1% to 40%.
9. The method of claim 8,
Wherein the step of immersing the patterned magnesium in the hydroxide solution is carried out in a 90 DEG C to 200 DEG C aqueous solution for 1 to 500 minutes.
9. The method of claim 8,
Prior to the step of patterning the surface of the magnesium with the masking film,
Electrolytic degreasing using an alkaline cleaning liquid; And
After the step of immersing the magnesium in the hydroxide solution, the step of rinsing
&Lt; / RTI &gt; further comprising at least one of the following steps:
9. The method of claim 8,
The step of immersing the magnesium in the hydroxide solution comprises:
A first immersion step in which magnesium is immersed in a M ₁ concentration hydroxide solution; And
Magnesium, and includes a first n dipping immersing in a hydroxide solution of a concentration of M _n,
In the first and nth immersion steps, the concentration of the hydroxide solution independently satisfies the following equations (2) and (3), and n is an integer of 2 or more and 6 or less:
&Quot; (2) &quot;
8? M ₁ ? 25
&Quot; (3) &quot;
M _n-1 -M _n &_gt; 3
In equations (2) and (3)
M ₁ and M _n denote concentration of the hydroxylated solution in each step, and the unit is%.
9. The method of claim 8,
The step of immersing the magnesium in the hydroxide solution comprises:
A first immersion step in which magnesium is immersed in a M ₁ concentration hydroxide solution; And
And a second immersion step in which magnesium is immersed in a M ₂ concentration hydroxide solution,
In the first and second immersion steps, the concentration of the hydroxide solution independently satisfies the following conditions (4) to (6):
&Quot; (4) &quot;
8? M ₁ ? 25
&Quot; (5) &quot;
1.5? M _2? 15
&Quot; (6) &quot;
M ₁ -M ₂ > 5
In Equations 4 to 6,
M ₁ and M ₂ denote concentration of the hydroxide solution in each step, and the unit is%.

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