KR20220148023A - Coater for Metal and Coating Method for Metal - Google Patents

Abstract

The technical problem to be solved by the present invention is to provide a metal coating method and a metal coating having excellent corrosion resistance. Provided is a metal coating including an oxide film formed on a metal surface and a silicon oil layer formed on the oxide film, wherein an oxide group of the oxide film and silicon of the silicon oil layer are bonded to form a bonding structure.

Description

Metal coating method and metal coating {Coater for Metal and Coating Method for Metal}

FIELD OF THE INVENTION The present invention relates to a metal coating method and a metal coating material, and more particularly, to a metal coating method and a metal coating material having excellent corrosion resistance as well as self-repairing.

Conventionally, in order to minimize corrosion of the metal and improve corrosion resistance, a method of coating the metal with oil is used.

Such a conventional metal coating method may include a step of forming a hydrophobic coating layer by coating a hydrophobic material on a metal surface followed by a step of forming an oil layer on the hydrophobic coating layer is followed.

Accordingly, the conventional metal coating method has a disadvantage in that the process steps are complicated because the hydrophobic coating layer is first formed on the metal surface and then the oil layer is formed on the hydrophobic coating layer.

In addition, the metal coated according to the conventional method, when the metal surface is damaged by abrasion, friction, etc., the damaged part loses hydrophobicity, and may be corroded by contact, penetration, etc. of a corrosive solution.

Accordingly, there is a need for a method capable of coating a metal even through a simple process step, and according to this coating method, a metal coating material having improved corrosion resistance is required.

The technical problem to be solved by the present invention is to provide a metal coating method and a metal coating material having excellent corrosion resistance.

Another technical problem to be solved by the present invention is to provide a self-healing metal coating method and a metal coating material.

Another technical problem to be solved by the present invention is to provide a metal coating method and a metal coating material having excellent stain resistance and cleaning properties.

Another technical problem to be solved by the present invention is to provide a metal coating method and a metal coating having excellent antibacterial properties.

Another technical problem to be solved by the present invention is to provide a metal coating method and a metal coating material having excellent freeze-off properties.

The technical problem to be solved by the present invention is not limited to the above.

In order to solve the above technical problem, the present invention provides a metal coating.

According to an embodiment, the metal coating includes an oxide film formed on the metal surface, and a silicone oil layer formed on the oxide film, wherein an oxide group of the oxide film and silicon of the silicone oil layer are combined. A bonding structure may be formed.

According to an embodiment, the oxide film may have a porous structure, and the porous structure may include a porosity of 10% or more to 60% or less.

According to an embodiment, when a scratch is generated on the metal surface, the silicone oil of the silicone oil layer may fill the scratch on the metal surface so that the metal surface may be self-repaired.

According to an embodiment, after the self-repair, a corrosion current density of the metal may be lower and a corrosion potential may be higher than when the scratch is generated.

According to an embodiment, the metal may include at least one of magnesium, aluminum, stainless steel, and copper.

In order to solve the above technical problem, the present invention provides a metal coating method.

According to an embodiment, the metal coating method includes preparing a metal, forming an oxide film on the metal surface, and forming a silicone oil layer on the oxide film, wherein the silicone oil layer is formed The performing may include bonding the oxide group of the oxide layer and the silicon of the silicone oil layer to form a bonding structure.

According to an embodiment, the oxide film in the step of forming the oxide film has a porous structure, the porous structure may include a porosity of 10% or more to 60% or less.

According to an embodiment, after the step of forming the silicone oil layer, the corrosion current density of the metal is lower than before the step of forming the silicone oil layer, and the corrosion potential may be the same or higher.

According to an embodiment, the silicone oil of the silicone oil layer in the step of forming the silicone oil layer may include, when a scratch occurs on the metal surface, filling the scratch on the metal surface and self-repairing the metal surface. can

According to an embodiment, after the self-recovery, the corrosion current density of the metal is lower than when the scratch is generated, and the corrosion potential may be high.

According to an embodiment, the forming of the silicone oil layer further includes the step of heat treatment, wherein the heat treatment step may be performed at room temperature or more and 300° C. or less.

According to an embodiment, the metal may include at least one of magnesium, aluminum, stainless steel, and copper.

According to an embodiment of the present invention, an oxide film formed on a metal surface, and a silicon oil layer formed on the oxide film, wherein an oxide group of the oxide film and silicon of the silicone oil layer are combined to form a bonding structure A metallic coating may be provided.

Corrosion resistance of the metal coating may be improved because the silicone oil layer has hydrophobicity.

Furthermore, since the silicone oil layer has hydrophobicity, the metal coating may have improved stain resistance and cleaning properties.

Furthermore, the metal coating may have improved antibacterial properties.

Furthermore, the metal coating material, even if ice is generated on the surface, the de-icing property can be improved.

Meanwhile, according to an embodiment of the present invention, the oxide film may have a porous structure.

Accordingly, the silicone oil of the silicone oil layer formed on the oxide layer may be supported on the porous structure.

Therefore, even when damage such as scratches or cracks occurs in the metal coating, the silicone oil supported on the porous structure of the oxide film fills the scratches and/or cracks on the metal surface so that the metal surface is self-healing. -repairing).

1 and 2 are views for explaining a metal coating according to an embodiment of the present invention.
3 is a view for explaining a metal coating method according to an embodiment of the present invention.
4A to 8 are views for explaining a corrosion resistance test example of the present invention.
9 to 13 are diagrams for explaining an example of a self-repairing experiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In this specification, when a component is referred to as being on another component, it means that it may be directly formed on the other component or a third component may be interposed therebetween. In addition, in the drawings, shapes and thicknesses of regions are exaggerated for effective description of technical content.

Also, in various embodiments of the present specification, terms such as first, second, third, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. Accordingly, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Each embodiment described and illustrated herein also includes a complementary embodiment thereof. In addition, in this specification, 'and/or' is used in the sense of including at least one of the elements listed before and after.

In the specification, the singular expression includes the plural expression unless the context clearly dictates otherwise. In addition, terms such as "comprise" or "have" are intended to designate that a feature, number, step, element, or a combination thereof described in the specification exists, and one or more other features, numbers, steps, or configurations It should not be construed as excluding the possibility of the presence or addition of elements or combinations thereof. In addition, in this specification, "connection" is used in a sense including both indirectly connecting a plurality of components and directly connecting a plurality of components.

In addition, terms such as “…unit”, “…group”, and “module” described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software or a combination of hardware and software. have.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, with reference to the drawings, a metal coating according to an embodiment of the present invention is described.

1 and 2 are views for explaining a metal coating according to an embodiment of the present invention.

Referring to FIG. 1 , the metal coating 100 may include at least one of an oxide film 20 and a silicone oil layer 30 formed on the metal 10 .

Hereinafter, each configuration is described.

The metal 10 may include, for example, at least one of magnesium, aluminum, stainless steel, and copper. Alternatively, the metal 10 may include at least one of generally well-known metals as well as the above-described examples. Alternatively, the metal 10 may be an alloy including at least one of the above-mentioned examples and the above-mentioned generally widely known metals.

The oxide film 20 may be formed on the surface of the metal 10 . In other words, the oxide film 20 may be a metal oxide film formed by oxidizing the surface of the metal 10 .

To this end, the metal 10 may be oxidized.

According to an embodiment, the oxide film 20 may be formed by a different oxidation method depending on the type of the metal 10 .

According to an embodiment, when the metal 10 is magnesium, the oxide film 20 may be formed by a plasma electrolysis process. When the oxide film 20 is formed on the surface of the metal 10, that is, magnesium by the plasma electrolysis process as described above, the oxide film 20 is resistant to high-temperature plasma and arc discharge generated during the plasma electrolysis process. Thus, it can be formed to a thickness of 10 μm or more.

Meanwhile, the oxide film 20 formed on the surface of the magnesium through the plasma electrolysis process may be further immersed in hot water (eg, boiling water) to be treated with boiling water.

According to an embodiment, when the metal 10 is at least one of aluminum and stainless steel, the oxide film 20 may be formed by an anodization process.

When the metal 10 is aluminum and the oxide film 20 is formed on the surface of the aluminum by the anodization process as described above, the oxide film 20 may include a cylindrical porous structure.

Meanwhile, the oxide film 20 formed on the surface of the aluminum through the anodization process may be further treated with phosphoric acid. Accordingly, the pore diameter of the cylindrical porous structure included in the oxide film 20 formed on the aluminum surface may be increased.

On the other hand, when the metal 10 is stainless steel, the oxide film 20 may be formed by the anodization process as described above using an ethylene glycol-based solution.

When the metal 101 is stainless steel, the oxide film 20 formed on the surface of the stainless steel through the anodization process may be an ammonium fluorometallate layer.

On the other hand, the oxide film 20 formed on the surface of the stainless steel through the anodization process may be further annealed at a high temperature (eg, 300 °C) higher than room temperature (eg, 20 °C). have. Accordingly, the oxide film 20 formed on the surface of the stainless steel may include a cylindrical porous structure.

According to an embodiment, when the metal 10 is copper, the oxide film 20 may be formed by a chemical oxidation process. When the oxide film 20 is formed on the surface of the metal 10 , that is, copper by the chemical oxidation process as described above, the oxide film 20 may include a nano-sized flake structure. Meanwhile, the flake structure here may include a porous structure. In other words, the oxide film 20 may have a nano-sized porous flake structure.

Meanwhile, the oxide film 20 may have a porous structure.

More specifically, the oxide film 20 may be formed in a porous structure during the oxidation treatment as described above. For example, the porous structure may include a porosity of 10% or more to 60% or less.

Accordingly, according to an embodiment of the present invention, when a silicone oil layer 30 to be described later is formed on the oxide film 20 , the silicone oil of the silicone oil layer 30 to be described later in the porous structure of the oxide film 20 . The supported loading ratio can be improved.

In addition, the porous structure of the oxide film 20 including a porosity of 10% or more to 60% or less in the above-described range according to an embodiment of the present invention is broken even with the porous structure as described above, that is, brittleness. (brittleness) can be minimized.

On the other hand, unlike the embodiment of the present invention, when the oxide film has a porous structure, but the porous structure has a porosity of less than 10%, when a silicone oil layer is formed on the oxide film, the silicon in the porous structure of the oxide film The loading rate at which the silicone oil of the oil layer is supported may be reduced.

Alternatively, unlike an embodiment of the present invention, the oxide film has a porous structure, but when the porous structure includes a porosity of more than 60%, brittleness is increased, and thus can be easily broken.

However, according to an embodiment of the present invention, the oxide film 20 has a porous structure including a porosity of 10% or more to 60% or less in the above-described range according to an embodiment of the present invention. As described above, while the brittleness of the oxide film 20 is minimized, the loading rate at which the silicone oil is supported on the porous structure of the oxide film 20 can be improved.

Meanwhile, the oxide film 20 may have hydrophilicity. This may be because the oxide film 20 has a high surface energy.

As described above, since the oxide film 20 has hydrophilicity, conventionally, a hydrophobic coating layer is formed by coating a metal surface with a hydrophobic material, for example, Teflon, self-assembled monomolecules, etc., and then the hydrophobic coating layer A method of forming an oil layer thereon is used.

However, this conventional metal coating method has a disadvantage in that the process steps are complicated because the hydrophobic coating layer is first formed on the metal surface and then the oil layer is formed on the hydrophobic coating layer.

In addition, the metal coated according to the conventional method, when the metal surface is damaged by abrasion, friction, etc., the damaged part loses hydrophobicity, and may be corroded by contact, penetration, etc. of a corrosive solution.

Accordingly, the present invention provides a metal coating method performed in a simple process step. In this regard, reference will be made to the metal coating method to be described later.

In addition, in the case of the metal coating 100 formed by the metal coating method to be described later, not only the corrosion resistance is excellent, but also when damage such as scratches and cracks occurs on the surface of the metal 10 . , it may be self-repairing by filling scratches and/or cracks on the surface of the metal 10 .

The silicone oil layer 30 may be formed on the oxide layer 20 .

More specifically, referring to FIG. 2 , silicon (Si in FIG. 2 ) of the silicone oil layer 30 is combined with an oxide group (O in FIG. 2 ) of the oxide film 20 to form a bonding structure. can be formed

Accordingly, as described above, the silicone oil layer 30 may be formed on the oxide film 20 .

Thus, the metal coating 100 according to an embodiment of the present invention, at least one of the oxide film 20 formed on the surface of the metal 10 and the silicon oil layer 30 formed on the oxide film 20 . may include.

Referring to FIG. 2, from a chemical point of view, the metal coating 100 is the metal 10 (Me in FIG. 2) and the oxide group (O in FIG. 2) of the oxide film 20 are combined, and the oxide film ( 20) may form a bonding structure in which the oxide group (O in FIG. 2 ) and silicon (Si in FIG. 2 ) of the silicone oil layer 30 are combined. In other words, through the oxide group (O in FIG. 2) of the oxide film 20, the metal 10 (Me in FIG. 2) and silicon (Si in FIG. 2) of the silicone oil layer 30 are combined. A bonding structure may be formed.

Accordingly, in the metal coating 100 , since the silicone oil layer 30 has hydrophobicity, corrosion resistance may be improved.

Furthermore, since the silicone oil layer 30 has hydrophobicity, the metal coating 100 may have improved stain resistance and cleaning properties.

Furthermore, the metal coating 100 may have improved antibacterial properties.

Furthermore, the metal coating 100, even if ice is generated on the surface, the de-icing property can be improved.

This is, in an experimental example of the present invention to be described later, after the silicone oil layer 30 is formed, the corrosion current density of the metal 10 is higher than before the silicone oil layer 30 is formed. low, and the corrosion potential can be demonstrated by the same or high. This will be described later, which will be described later.

On the other hand, as described above, since the oxide film 20 is formed in a porous structure, the silicone oil of the silicone oil layer 30 formed on the oxide film 20 may be supported on the porous structure. Of course.

Accordingly, even when damage such as scratches and cracks occurs on the surface of the metal 10 , the silicone oil supported on the porous structure of the oxide film 20 prevents scratches and/or cracks on the surface of the metal 10 . By filling in, the surface of the metal 10 may be self-healing.

This is, in the experimental example of the present invention to be described later, after the surface of the metal 10 is self-recovered, the corrosion current density of the metal 10 is lower than when the scratch is generated, and the corrosion It can be demonstrated that the potential (corrosion potential) is high. This will be described later, which will be described later.

Above, the metal coating 100 according to an embodiment of the present invention has been described.

Hereinafter, a metal coating method according to an embodiment of the present invention will be described.

3 is a view for explaining a metal coating method according to an embodiment of the present invention.

Referring to FIG. 3 , the metal coating method includes preparing a metal (S110), forming an oxide film on the metal surface (S120), and forming a silicone oil layer on the oxide film (S130). It may include at least one.

Hereinafter, each step is described. In each step described below, descriptions overlapping with each configuration in the above-described embodiment may be omitted. However, omitting the description below does not exclude it.

Step S110

In step S110 , the metal 10 may be prepared.

In this step, as described above, the metal 10 may include, for example, at least one of magnesium, aluminum, stainless steel, and copper. Alternatively, the metal 10 may include at least one of generally well-known metals as well as the above-described examples. Alternatively, the metal 10 may be an alloy including at least one of the above-mentioned examples and the above-mentioned generally widely known metals.

Step S120

In step S120 , an oxide film 20 may be formed on the surface of the metal 10 . In other words, the oxide film 20 may be a metal oxide film formed by oxidizing the surface of the metal 10 .

To this end, an oxidation process may be performed on the metal 10 in this step.

Meanwhile, in this step, the oxidation process may be performed in a different way depending on the type of the metal 10 .

According to an embodiment, when the metal 10 is magnesium, a plasma electrolysis process may be performed on the metal 10 in this step to form an oxide film 20 on the surface of the metal 10 . In this case, the oxide film 20 having a thickness of 10 μm or more may be formed on the surface of the metal 10 , that is, magnesium by high-temperature plasma and arc discharge generated during the plasma electrolysis process.

On the other hand, when the oxide film 20 is formed on the surface of the magnesium in this step through the plasma electrolysis process, the oxide film 20 is further immersed in hot water (eg, boiling water) to boil water (boiling water) may be treated.

According to an embodiment, when the metal 10 is at least one of aluminum and stainless steel, an anodization process is performed on the metal 10 in this step, and an oxide film 20 is formed on the surface of the metal 10 . can be formed.

When the metal 10 is aluminum, the oxide film 20 formed on the surface of the aluminum through the anodization process in this step may include a cylindrical porous structure.

Meanwhile, the oxide film 20 formed on the surface of the aluminum in this step through the anodization process may be further treated with phosphoric acid. Accordingly, the pore diameter of the cylindrical porous structure included in the oxide film 20 formed on the aluminum surface may be increased.

On the other hand, when the metal 10 is stainless steel, the oxide film 20 may be formed by the anodization process as described above using an ethylene glycol based solution in this step.

When the metal 101 is stainless steel, the oxide film 20 formed on the surface of the stainless steel through the anodization process in this step may be an ammonium fluorometallate layer.

Meanwhile, the oxide film 20 formed on the surface of the stainless steel in this step through the anodization process may be further annealed at a high temperature higher than room temperature. Accordingly, the oxide film 20 formed on the surface of the stainless steel may include cylindrical pores.

According to an embodiment, when the metal 10 is copper, a chemical oxidation process may be performed on the metal 10 in this step to form an oxide film 20 on the surface of the metal 10 .

In this case, the oxide film 20 formed on the surface of the metal 10 , that is, copper in this step, may include a nano-sized flake structure. Meanwhile, the flake structure here may include a porous structure. In other words, the oxide film 20 may have a nano-sized porous flake structure.

Meanwhile, the oxide film 20 formed in this step may have a porous structure, as described above.

More specifically, the oxide film 20 may be formed in a porous structure during the oxidation treatment as described above in this step. For example, the porous structure may include a porosity of 10% or more to 60% or less.

Accordingly, according to an embodiment of the present invention, when the silicone oil layer 30 is formed on the oxide film 20 in a step to be described later, the porous structure of the oxide film 20 includes the silicone oil layer 30 described later. The loading rate at which the silicone oil is supported can be improved.

In addition, the porous structure of the oxide film 20 including a porosity of 10% or more to 60% or less in the above-described range according to an embodiment of the present invention is broken even with the porous structure as described above, that is, brittleness. (brittleness) can be minimized.

On the other hand, unlike the embodiment of the present invention, when the oxide film has a porous structure, but the porous structure has a porosity of less than 10%, when a silicone oil layer is formed on the oxide film, the silicon in the porous structure of the oxide film The loading rate at which the silicone oil of the oil layer is supported may be reduced.

Alternatively, unlike an embodiment of the present invention, the oxide film has a porous structure, but when the porous structure includes a porosity of more than 60%, brittleness is increased, and thus can be easily broken.

However, according to an embodiment of the present invention, the oxide film 20 has a porous structure including a porosity of 10% or more to 60% or less in the above-described range according to an embodiment of the present invention. As described above, while the brittleness of the oxide film 20 is minimized, the loading rate at which the silicone oil is supported on the porous structure of the oxide film 20 can be improved.

Meanwhile, the oxide film 20 formed in this step may have hydrophilicity. This may be because the oxide film 20 has a high surface energy.

As described above, since the oxide film 20 has hydrophilicity, conventionally, after forming a hydrophobic coating layer by coating a hydrophobic material, for example, Teflon, self-assembled monomolecules, etc. on a metal surface, oil on the hydrophobic coating layer A method of forming a layer is used.

However, this conventional metal coating method has a disadvantage in that the process steps are complicated because the hydrophobic coating layer is first formed on the metal surface and then the oil layer is formed on the hydrophobic coating layer.

In addition, the metal coated according to the conventional method, when the metal surface is damaged by abrasion, friction, etc., the damaged part loses hydrophobicity, and may be corroded by contact, penetration, etc. of a corrosive solution.

However, according to an embodiment of the present invention, the silicone oil layer 30 can be easily formed on the oxide film 20 by a simple process step to be described later.

Step S130

In step S130 , a silicone oil layer 30 may be formed on the oxide film 20 .

In this step, the formation of the silicone oil layer 30 can be easily performed with a simple process step as described above.

More specifically, providing silicone oil to the oxide film 20 in this step, for example, simply dropping silicone oil to the oxide film 20, the silicone oil layer 30 is formed can be

This may be because the oxide film 20 is formed on the surface of the metal 10 in the previous step S120 .

In other words, when the oxide film 20 is formed on the surface of the metal 10 , the oxide group of the oxide film 20 is combined with the silicon of the silicone oil provided in this step to form a bonding structure, so that the oxide film 20 ) on which the silicone oil layer 30 may be formed.

Thus, the metal coating 100 according to an embodiment of the present invention, as described above, the oxide film 20 formed on the surface of the metal 10, and a silicone oil layer ( 30), which may include at least any one of.

Referring to FIG. 2, from a chemical point of view, the metal coating 100 is the metal 10 (Me in FIG. 2) and the oxide group (O in FIG. 2) of the oxide film 20 are combined, and the oxide film ( 20) may form a bonding structure in which the oxide group (O in FIG. 2) and silicon (Si in FIG. 2) of the silicone oil layer 30 are combined. In other words, through the oxide group (O in FIG. 2) of the oxide film 20, the metal 10 (Me in FIG. 2) and silicon (Si in FIG. 2) of the silicone oil layer 30 are combined. A bonding structure may be formed.

Accordingly, in the metal coating 100 , since the silicone oil layer 30 has hydrophobicity, corrosion resistance may be improved.

This is, in the experimental example of the present invention to be described later, after the silicone oil layer 30 is formed through this step, the corrosion current density of the metal 10 is lower than before the silicone oil layer 30 is formed, and , which can be demonstrated by having the same or higher corrosion potential. This will be described later, which will be described later.

Furthermore, since the silicone oil layer 30 has hydrophobicity, the metal coating 100 may have improved stain resistance and cleaning properties.

Furthermore, the metal coating 100 may have improved antibacterial properties.

Furthermore, the metal coating 100, even if ice is generated on the surface, the de-icing property can be improved.

On the other hand, as described above, since the oxide film 20 is formed in a porous structure, the silicone oil of the silicone oil layer 30 formed on the oxide film 20 in this step is to be supported on the porous structure. Of course you can.

Accordingly, even when damage such as scratches and cracks occurs on the surface of the metal 10 , the silicone oil supported on the porous structure of the oxide film 20 prevents scratches and/or cracks on the surface of the metal 10 . By filling in, the surface of the metal 10 may be self-healing.

Meanwhile, according to an embodiment, this step may further include a heat treatment step.

The heat treatment may be performed at room temperature (eg, 20 °C) or higher to 300 °C or lower.

Accordingly, as described above, a reaction rate in which the oxide group of the oxide film 20 and the silicon of the silicone oil layer 30 are combined to form a bonding structure may be accelerated.

According to an experimental example of the present invention, in the above-described range, that is, at a temperature of room temperature or more to 300° C. or less, as the heat treatment temperature increases, the reaction rate of forming the bonding structure as described above is increased.

Meanwhile, when the heat treatment is performed as described above in this step, the contact angle with water due to the hydrophobicity of the silicone oil layer 30 may be reduced.

According to an experimental example of the present invention, when the above-described heat treatment step is performed, the contact angle between the silicone oil layer 30 and water is 2 when the metal 10 is magnesium, aluminum, stainless steel, and copper, respectively. ° or less.

On the other hand, the contact angle of the silicone oil layer 30 and water before the above-described heat treatment step is performed is 31.2 ° when the metal 10 is magnesium, 51.3 ° in the case of aluminum, 50.7 ° in the case of stainless steel, copper It can be seen that the contact angle with water due to the hydrophobicity of the silicone oil layer 30 is greatly reduced when the heat treatment as described above is performed in this step.

In addition, through the experiment of the present invention, when water droplets are dropped on the surface of the metal coating 100 on which the above-described heat treatment step is performed and tilted at about 3 °, the water drops easily move along the surface of the metal coating 100 . observed to be.

This is a result demonstrating that, by performing the heat treatment step as described above in this step, the metal coating 100 has excellent hydrophobicity as described above, and thus corrosion resistance can be improved. Furthermore, by having the metal coating 100 having hydrophobicity, it goes without saying that the metal coating 100 may have improved stain resistance and cleaning properties, antibacterial properties, and freeze-off properties.

Above, a metal coating method according to an embodiment of the present invention has been described.

On the other hand, the metal coating 100 formed by the above-described steps S110 to S130 may be heat-treated even when damage such as cracks, scratches, or cracks occurs on the surface when exposed to an external environment.

This is, as described above, when damage such as scratches and cracks occurs on the surface of the metal 10 , the silicone oil supported on the porous structure of the oxide film 20 , scratches on the surface of the metal 10 and In order to self-repair the surface of the metal 10 by filling the cracks, this is to improve the reaction rate at which the bonding structure as described above is formed.

Hereinafter, a corrosion resistance test example of the present invention will be described.

Metal according to Experimental Example 1-1 of coating formation

Magnesium is prepared as the metal 10, and in an aqueous electrolyte (0.03 M Na ₂ SiO ₃ + 0.07 M KOH + 0.01 M KF) atmosphere (maintained at a temperature of 40 ° C.), 100 mA/cm ² of the anode of the magnesium A current density was applied for 10 minutes to form an oxide film 20 on the surface of magnesium by a plasma electrolysis process.

In addition, the oxide film 20 was further immersed in boiling water for 50 minutes to be treated with boiling water.

Finally, by simply dropping silicone oil on the oxide film 20, heat treatment at a temperature of 300 ° C. for 20 minutes, and forming the silicone oil layer 30, according to Experimental Example 1-1 A metal coating was formed.

Metal according to Experimental Example 2-1 of coating formation

Aluminum was prepared as the metal 10, and an anode voltage of 40 V was applied to the aluminum for 30 minutes in a 0.3 M oxalic acid atmosphere (maintained at a temperature of 0 ° C.), and the aluminum was oxidized by an anodization process. An oxide film 20 was formed on the surface.

In addition, the oxide film 20 was further immersed in 0.1 M phosphoric acid at a temperature of 30° C. for 60 minutes, followed by phosphoric acid treatment.

Finally, the metal coating material according to Experimental Example 2-1 by simply dropping silicone oil on the oxide film 20 and heat-treating it at a temperature of 300° C. for 20 minutes to form the silicone oil layer 30 . was formed.

Metal according to Experimental Example 3-1 of coating formation

Prepare stainless steel as the metal 10, and immerse the stainless steel in an ethylin glycol-based electrolyte (NH ₄ F + 0.4 g of ethylene glycol in 1 L of water) at a temperature of 15 ° C. , a constant voltage of 60 V was applied for 5 minutes to form an oxide film 20 on the surface of the stainless steel by an anodization process.

In addition, the oxide film 20 was further annealed at 300° C. for 3 minutes.

Finally, the metal coating material according to Experimental Example 3-1 by simply dropping silicone oil on the oxide film 20 and heat-treating it at a temperature of 300° C. for 20 minutes to form the silicone oil layer 30 . was formed.

Metal according to Experimental Example 4-1 of coating formation

After preparing copper as the metal 10 and reacting with 0.08 M nitric acid, 2.5 M sodium hydroxide (NaOH) and 0.13 M ammonium (ammonium, NH ₄ ) at a temperature of 60 ° C. In a mixed solution By immersion for 40 minutes, an oxide film 20 was formed on the surface of copper by a chemical oxidation process.

In addition, the oxide film 20 was further heat-treated at 180° C. for 2 hours.

In addition, by simply dropping silicone oil on the oxide film 20, heat treatment at a temperature of 300 ° C. for 20 minutes to form the silicone oil layer 30, the metal coating according to Experimental Example 4-1 formed.

Preparation of metal according to Comparative Example 1A

Magnesium used as the metal 10 in Experimental Example 1-1 described above was prepared as a metal according to Comparative Example 1A.

Preparation of metal according to Comparative Example 2A

Aluminum used as the metal 10 in Experimental Example 2-1 described above was prepared as a metal according to Comparative Example 2A.

Preparation of metal according to Comparative Example 3A

Stainless steel used as the metal 10 in Experimental Example 3-1 described above was prepared as a metal according to Comparative Example 3A.

Preparation of metal according to Comparative Example 4A

Copper used as the metal 10 in Experimental Example 3-1 described above was prepared as a metal according to Comparative Example 4A.

Formation of oxide film according to Comparative Example 1-1

In Experimental Example 1-1, the silicon oil layer 30 was not formed, and the oxide film according to Comparative Example 1-1 was formed in the same manner as in Experimental Example 1-1.

Formation of an oxide film according to Comparative Example 2-1

In Experimental Example 2-1, the silicon oil layer 30 was not formed, and the oxide film according to Comparative Example 2-1 was formed in the same manner as in Experimental Example 2-1.

Formation of an oxide film according to Comparative Example 3-1

In Experimental Example 3-1, the silicon oil layer 30 was not formed, and the oxide film according to Comparative Example 3-1 was formed in the same manner as in Experimental Example 3-1.

Formation of an oxide film according to Comparative Example 4-1

In Experimental Example 4-1, the silicon oil layer 30 was not formed, and the oxide film according to Comparative Example 4-1 was formed in the same manner as in Experimental Example 4-1.

The above-described experimental examples and comparative examples may be organized as shown in Table 1 below.

Metal(10) oxide film (20) silicone oil layer (30) Experimental Example 1-1 magnesium formation formation Experimental Example 2-1 aluminum formation formation Experimental Example 3-1 stainless steel formation formation Experimental Example 4-1 Copper formation formation Comparative Example 1A magnesium unformed unformed Comparative Example 2A aluminum unformed unformed Comparative Example 3A stainless steel unformed unformed Comparative Example 4A Copper unformed unformed Comparative Example 1-1 magnesium formation unformed Comparative Example 2-1 aluminum formation unformed Comparative Example 3-1 stainless steel formation unformed Comparative Example 4-1 Copper formation unformed

4A to 8 are views for explaining a corrosion resistance test example of the present invention.

Referring to FIG. 4A , in Experimental Example 1-1 of the present invention described above, before forming the silicone oil layer 30 , the metal 10 , that is, magnesium and the oxide film 20 formed on the magnesium were observed. can

As described above, according to Experimental Example 1-1 of the present invention, when the oxide film 20 is formed on the surface of the metal 10 , that is, magnesium by the plasma electrolysis process as described above, the oxide film 20 ) can be observed to be formed to a thickness of 10 μm or more by high-temperature plasma and arc discharge generated during the plasma electrolysis process.

Referring to FIG. 4B , the surface of the oxide film 20 formed according to Experimental Example 1-1 of the present invention can be observed.

It can be observed that the oxide film 20 is formed in a porous structure, as described above.

On the other hand, referring to FIG. 5A, in Experimental Example 2-1 of the present invention described above, before forming the silicone oil layer 30, the metal 10, that is, aluminum and the oxide film 20 formed on the aluminum were can be observed

As described above, according to Experimental Example 2-1 of the present invention, when the oxide film 20 is formed on the surface of the metal 10, that is, aluminum by the anodization process and phosphoric acid treatment as described above, the It can be observed that the oxide film 20 is formed in a cylindrical porous structure.

Referring to FIG. 5B , the surface of the oxide film 20 formed according to Experimental Example 2-1 of the present invention can be observed.

It can be observed that the oxide film 20 is formed in a porous structure, as described above.

Meanwhile, referring to FIG. 6A , in Experimental Example 3-1 of the present invention described above, before forming the silicon oil layer 30 , the metal 10 , that is, stainless steel and the oxide film 20 formed on the stainless steel ) can be observed.

As described above, according to Experimental Example 3-1 of the present invention, the oxide film 20 is formed by an anodization process using an ethylin glycol-based electrolyte as described above on the surface of the metal 10, that is, stainless steel. When formed, it can be observed that the oxide film 20 is formed in a cylindrical porous structure.

Referring to FIG. 6B , the surface of the oxide film 20 formed according to Experimental Example 3-1 of the present invention can be observed.

It can be observed that the oxide film 20 is formed in a porous structure, as described above.

On the other hand, referring to FIG. 7A, in Experimental Example 4-1 of the present invention described above, before forming the silicone oil layer 30, the metal 10, that is, copper and the oxide film 20 formed on the copper can be observed

As described above, according to Experimental Example 4-1 of the present invention, when the oxide film 20 is formed on the surface of the metal 10, that is, copper by the chemical oxidation process as described above, the oxide film 20 ) can be observed to include a nano-sized porous flake structure.

Referring to FIG. 7B , the surface of the oxide film 20 formed according to Experimental Example 4-1 of the present invention can be observed.

It can be observed that the oxide film 20 has a nano-sized porous flake structure, as described above.

Meanwhile, referring to FIG. 8 , it is possible to observe the corrosion resistance evaluation results for the experimental examples and comparative examples of the present invention.

For the corrosion resistance evaluation as described above, for the experimental examples and comparative examples of the present invention, by performing a potentiodynamic polarization test in a 0.1 M hydrogen chloride (HCl) solution, corrosion current density (corrosion) current density) and corrosion potential were measured. For reference, in the potentiometric polarization test, the lower the corrosion current density of the measured metal, the higher the corrosion potential may mean that the corrosion resistance is excellent.

Referring to FIG. 8 , as a result of the above-described potentiometric polarization test, magnesium according to Comparative Example 1A had a corrosion current density (Icorr in FIG. 8 ) of 4.41 X 10 ^-3 A/cm ² .

It can be analyzed that, in the magnesium according to Comparative Example 1A, the oxide film 20 and the silicone oil layer 30 are not formed, and thus the corrosion resistance is lowered.

Meanwhile, magnesium according to Comparative Example 1-1 had a corrosion current density (Icorr in FIG. 8) of 1.34 X 10 ^-3 A/cm ² . In addition, the anticorrosive efficiency of magnesium according to Comparative Example 1-1 was measured to be 69.61%.

It can be analyzed that, in the magnesium according to Comparative Example 1-1, the silicone oil layer 30 is not formed, and thus corrosion resistance is lowered.

Meanwhile, magnesium according to Experimental Example 1-1 of the present invention had a corrosion current density (Icorr in FIG. 8) of 1.76 X 10 ^-11 A/cm ² .

This is compared to Comparative Example 1A and Comparative Example 1-1 described above, it can be seen that the corrosion current density of magnesium according to Experimental Example 1-1 of the present invention is relatively very low. In addition, the anticorrosive efficiency of magnesium according to Experimental Example 1-1 was measured to be 99.99%.

Meanwhile, referring to FIG. 8 , the corrosion potential of magnesium according to Comparative Example 1A and Comparative Example 1-1 (Ecorr in FIG. 8) was measured to be the same, while the corrosion potential of magnesium according to Experimental Example 1-1 of the present invention. (Ecorr in FIG. 8) was measured to be higher than Comparative Example 1A and Comparative Example 1-1.

Accordingly, when the oxide film 20 and the silicon oil layer 30 are formed on the metal 10, ie, magnesium, according to Experimental Example 1-1 of the present invention, it can be proven to have excellent corrosion resistance.

Referring back to FIG. 8 , as a result of the above-described potentiometric polarization test, aluminum according to Comparative Example 2A had a corrosion current density (Icorr in FIG. 8 ) of 5.02 X 10 ⁻⁵ A/cm ² .

This can be analyzed that, in the aluminum according to Comparative Example 2A, the oxide film 20 and the silicon oil layer 30 are not formed, and thus the corrosion resistance is reduced.

Meanwhile, aluminum according to Comparative Example 2-1 had a corrosion current density (Icorr in FIG. 8) of 1.77 X 10 ^-5 A/cm ² . In addition, the anticorrosive efficiency of aluminum according to Comparative Example 2-1 was measured to be 64.83%.

It can be analyzed that, in the aluminum according to Comparative Example 2-1, the silicone oil layer 30 is not formed, and thus corrosion resistance is lowered.

On the other hand, in the aluminum according to Experimental Example 2-1 of the present invention, the corrosion current density (Icorr in FIG. 8) was measured to be 2.01 X 10 ^-11 A/cm ² .

It can be seen that, compared with Comparative Example 2A and Comparative Example 2-1 described above, the corrosion current density of aluminum according to Experimental Example 2-1 of the present invention is relatively very low. In addition, the anticorrosive efficiency of aluminum according to Experimental Example 2-1 was measured to be 99.99%.

Meanwhile, referring to FIG. 8 , the corrosion potential (Ecorr of FIG. 8 ) of magnesium according to Experimental Example 2-1 and Comparative Example 2-1 of the present invention was the same, but was measured to be higher than Comparative Example 2A.

Accordingly, when the oxide film 20 and the silicon oil layer 30 are formed on the metal 10, that is, aluminum according to Experimental Example 2-1 of the present invention, it can be proved that the oxide film has excellent corrosion resistance.

Referring back to FIG. 8 , as a result of the above-described potentiometric polarization test, the stainless steel according to Comparative Example 3A had a corrosion current density (Icorr in FIG. 8 ) of 6.87 X 10 ^-6 A/cm ² .

It can be analyzed that, in the stainless steel according to Comparative Example 3A, the oxide film 20 and the silicone oil layer 30 are not formed, and thus the corrosion resistance is lowered.

Meanwhile, in the stainless steel according to Comparative Example 3-1, the corrosion current density (Icorr in FIG. 8) was measured to be 2.44 X 10 ^-6 A/cm ² .

It can be analyzed that, in the stainless steel according to Comparative Example 3-1, the silicone oil layer 30 is not formed, and thus corrosion resistance is lowered.

Meanwhile, in the stainless steel according to Experimental Example 3-1 of the present invention, the corrosion current density (Icorr in FIG. 8) was measured to be 9.47 X 10 ^-11 A/cm ² .

It can be seen that, compared with Comparative Example 3A and Comparative Example 3-1 described above, the corrosion current density of the stainless steel according to Experimental Example 3-1 of the present invention is relatively very low. In addition, the anticorrosive efficiency of the stainless steel according to Experimental Example 3-1 was measured to be 99.99%.

Meanwhile, referring to FIG. 8 , corrosion of magnesium according to Comparative Example 3-1 (Ecorr in FIG. 8) was measured to be lower than that of Comparative Example 3A, while corrosion potential of magnesium according to Experimental Example 3-1 of the present invention (Ecorr in FIG. 8) Ecorr of FIG. 8) was measured to be higher than that of Comparative Example 3A and Comparative Example 3-1.

Accordingly, when the oxide film 20 and the silicon oil layer 30 are formed on the metal 10 , ie, stainless steel, according to Experimental Example 3-1 of the present invention, it can be proved that it has excellent corrosion resistance.

Referring back to FIG. 8 , as a result of the above-described potentiometric polarization test, copper according to Comparative Example 4A and Comparative Example 4-1 had a corrosion current density (Icorr in FIG. 8 ) of 1.09 X 10 ^-5 A/cm ² . became

This is that, in the copper according to Comparative Example 4A, the oxide film 20 and the silicone oil layer 30 were not formed, and in the copper according to Comparative Example 4-1, the silicone oil layer 30 was not formed, It can be analyzed that the corrosion resistance is lowered.

Meanwhile, copper according to Experimental Example 4-1 of the present invention had a corrosion current density (Icorr in FIG. 8) of 5.64 X 10 ^-11 A/cm ² .

It can be seen that, compared with Comparative Example 4A and Comparative Example 4-1 described above, the corrosion current density of copper according to Experimental Example 4-1 of the present invention is relatively very low. In addition, the corrosion protection efficiency of copper according to Experimental Example 4-1 was measured to be 99.99%.

On the other hand, referring to FIG. 8, the corrosion of magnesium according to Comparative Example 4-1 (Ecorr in FIG. 8) was measured to be lower than that of Comparative Example 4A, while the corrosion potential of magnesium according to Experimental Example 4-1 of the present invention (Ecorr in FIG. 8) Ecorr of FIG. 8) was measured to be higher than that of Comparative Example 4A and Comparative Example 4-1.

Accordingly, when the oxide film 20 and the silicon oil layer 30 are formed on the metal 10 , ie, copper, according to Experimental Example 4-1 of the present invention, it can be verified that the metal has excellent corrosion resistance.

As described above, according to the results of the electrostatic polarization test with reference to FIG. 8 , the corrosion current density of the metal 10 according to Experimental Examples 1-1 to 4-1 of the present invention is, Comparative Example 1-1 to Comparative Example 4-1 It can be seen that it is lower than the metal according to

In addition, it can be seen that the corrosion potential of the metal 10 according to Experimental Examples 1-1 to 4-1 of the present invention is equal to or higher than the metal according to Comparative Examples 1-1 to 4-1.

Accordingly, in the metal coating 100 formed according to the experimental examples of the present invention, the oxide film 20 is formed on the surface of the metal 10 , and the silicone oil layer 30 is formed on the oxide film 20 . It can be demonstrated that corrosion resistance is improved by forming a bonding structure by combining the oxide group of the oxide film 20 with the silicon of the silicone oil layer 30 .

This is a metal coating method by a simple process step including at least any one of steps S110 to S130 of the present invention described above, and as shown in FIG. 2 , the metal 10 (Me in FIG. 2) and the oxide film ( 20) is bonded to the oxide group (O in FIG. 2), and the oxide group (O in FIG. 2) of the oxide film 20 and silicon (Si in FIG. 2) of the silicone oil layer 30 are organically bonded. It could be because

Hereinafter, a self-repairing experimental example of the present invention will be described.

According to an embodiment of the present invention, as described above, the oxide film 20 is formed in a porous structure, and the silicone oil of the silicone oil layer 30 formed on the oxide film 20 has the porous structure. can be loaded on

Accordingly, even when damage such as scratches and cracks occurs on the surface of the metal 10 , the silicone oil supported on the porous structure of the oxide film 20 prevents scratches and/or cracks on the surface of the metal 10 . By filling in, the surface of the metal 10 may be self-healing.

Accordingly, in order to examine the self-healing properties as described above, metal coatings according to the experimental examples and comparative examples of the present invention were prepared as follows.

Metal according to Experimental Example 1-2 of coating Ready

A scratch was formed on the metal coating according to Experimental Example 1-1 described above using a blade, and heat treatment was performed at a temperature of 300° C. for 10 minutes to prepare a metal coating according to Experimental Example 1-2.

Metal according to Experimental Example 2-2 of coating Ready

A scratch was formed on the metal coating according to Experimental Example 2-1 described above using a blade, and heat treatment was performed at a temperature of 300° C. for 10 minutes to prepare a metal coating according to Experimental Example 2-2.

Metal according to Experimental Example 3-2 of coating Ready

A scratch was formed on the metal coating according to Experimental Example 3-1 described above using a blade, and heat-treated at a temperature of 300° C. for 10 minutes to prepare a metal coating according to Experimental Example 3-2.

Metal according to Experimental Example 4-2 of coating Ready

A scratch was formed on the metal coating according to Experimental Example 4-1 described above using a blade, and heat treatment was performed at a temperature of 300° C. for 10 minutes to prepare a metal coating according to Experimental Example 4-2.

In the above-described Experiment 1-2 to Experimental Example 4-2, the heat treatment as described above is, as described above, the silicone oil supported on the porous structure of the oxide film 20, the surface of the metal 10 In the self-healing of the surface of the metal 10 by filling scratches and/or cracks, this was performed to improve the reaction rate in which the bonding structure as described above is formed.

In other words, according to the embodiment of the present invention, as described above, without performing the heat treatment as described above, when damage such as cracks, scratches, or cracks occurs in the metal coating 100 , It should be noted that self-healing may be performed as described above, but heat treatment may be performed for rapid testing of the present invention.

Metal according to Comparative Example 1-2 of coating Ready

In Experimental Example 1-2 described above, a metal coating according to Comparative Example 1-2 was prepared without heat treatment.

Metal according to Comparative Example 2-2 of coating Ready

In Experimental Example 2-2 described above, a metal coating according to Comparative Example 2-2 was prepared without heat treatment.

Metal according to Comparative Example 3-2 of coating Ready

In Experimental Example 3-2 described above, a metal coating according to Comparative Example 3-2 was prepared without heat treatment.

Metal according to Comparative Example 4-2 of coating Ready

In Experimental Example 4-2 described above, a metal coating according to Comparative Example 4-2 was prepared without heat treatment.

9 to 13 are diagrams for explaining an example of a self-repairing experiment of the present invention.

Referring to FIG. 9 , according to Experimental Example 1-2 of the present invention, a metal coating on which a scratch (sc) is formed can be observed. In this case, the metal 10 may be magnesium.

Referring to FIG. 10 , according to Experimental Example 2-2 of the present invention, a metal coating on which a scratch sc is formed can be observed. At this time, the metal 10 may be aluminum.

Referring to FIG. 11 , according to Experimental Example 3-2 of the present invention, a metal coating in which a scratch (sc) is formed can be observed. At this time, the metal 10 may be stainless steel.

Referring to FIG. 12 , according to Experimental Example 4-2 of the present invention, a metal coating on which a scratch (sc) is formed can be observed. In this case, the metal 10 may be copper.

Meanwhile, referring to FIG. 13 , self-repair evaluation results for experimental examples and comparative examples of the present invention can be observed.

For self-recovery evaluation as described above, as in the corrosion resistance test described above, for the experimental examples and comparative examples of the present invention, a potentiodynamic polarization test in 0.1 M hydrogen chloride (HCl) solution ) to measure the corrosion current density and corrosion potential. Here, the lower the corrosion current density of the metal measured by the potentiometric polarization test, the higher the corrosion potential may mean that the self-healing power is excellent.

Referring to FIG. 13, in the above-described potentiometric polarization test results, the corrosion current density (Icorr in FIGS. 8 and 13) measured in the metal coating according to Experimental Example 1-1 is 1.76 X 10 ^-11 A/cm It was ² . In addition, the anticorrosive efficiency of the metal coating according to Experimental Example 1-1 was measured to be 99.99%.

On the other hand, in the metal coating according to Comparative Example 1-2, the corrosion current density (Icorr in FIG. 13) was measured to be 8.21 X 10 ^-5 A/cm ² . In addition, the anticorrosive efficiency of the metal coating according to Comparative Example 1-2 was measured to be 98.14%.

It can be analyzed that in the metal coating according to Comparative Example 1-2, the scratch is formed, and the corrosion current density is increased to lower the corrosion resistance, while the self-recovery is not performed.

On the other hand, in contrast to this, the metal coating according to Experimental Example 1-2 had a corrosion current density (Icorr in FIG. 13 ) of 1.85 X 10 ^-7 A/cm ² . In addition, the anticorrosive efficiency of the metal coating according to Experimental Example 1-2 was measured to be 99.99%.

In addition, referring to FIG. 13 , the corrosion potential (Ecorr of FIG. 13 ) of the metal coating according to Experimental Example 1-2 of the present invention was measured to be higher than that of Comparative Example 1-2.

Thus, in the metal coating according to Experimental Example 1-2 of the present invention, it can be verified that the silicone oil supported on the porous structure of the oxide film 20 fills the scratch on the surface of the metal 10 and self-repairs. .

Referring again to FIG. 13 , in the above-described potentiometric polarization test results, the corrosion current density (Icorr in FIGS. 8 and 13) measured in the metal coating according to Experimental Example 2-1 was 2.01 X 10 ^-11 A/ cm2 ^. In addition, the anticorrosive efficiency of the metal coating according to Experimental Example 2-1 was measured to be 99.99%.

On the other hand, in the metal coating according to Comparative Example 2-2, the corrosion current density (Icorr in FIG. 13) was measured to be 2.56 X 10 ^-7 A/cm ² . In addition, the anticorrosive efficiency of the metal coating according to Comparative Example 2-2 was measured to be 99.49%.

It can be analyzed that, in the metal coating according to Comparative Example 2-2, the scratch is formed, so that the corrosion current density is increased and the corrosion resistance is lowered, while the self-recovery is not.

On the other hand, in contrast to this, in the metal coating according to Experimental Example 2-2, the corrosion current density (Icorr in FIG. 13) was measured to be 8.08 X 10 ^-10 A/cm ² . In addition, the anticorrosive efficiency of the metal coating according to Experimental Example 2-2 was measured to be 99.69%.

In addition, referring to FIG. 13 , the corrosion potential (Ecorr of FIG. 13 ) of the metal coating according to Experimental Example 2-2 of the present invention was the same as in Experimental Example 2-1 and was measured to be higher than that of Comparative Example 2-2.

Accordingly, in the metal coating according to Experimental Example 2-2 of the present invention, it can be verified that the silicone oil supported on the porous structure of the oxide film 20 fills the scratch on the surface of the metal 10 and self-repairs. .

Referring back to FIG. 13 , in the above-described potentiometric polarization test results, the corrosion current density (Icorr in FIGS. 8 and 13) measured in the metal coating according to Experimental Example 3-1 was 9.47 X 10 ^-11 A/ cm2 ^. In addition, the anticorrosive efficiency of the metal coating according to Experimental Example 3-1 was measured to be 99.99%.

On the other hand, in the metal coating according to Comparative Example 3-2, the corrosion current density (Icorr in FIG. 13) was measured to be 2.12 X 10 ^-8 A/cm ² . In addition, the anticorrosive efficiency of the metal coating according to Comparative Example 3-2 was measured to be 99.69%.

It can be analyzed that, in the metal coating according to Comparative Example 3-2, the scratch is formed, so that the corrosion current density is increased and the corrosion resistance is lowered, while the self-recovery is not.

On the other hand, in contrast to this, the metal coating according to Experimental Example 3-2 had a corrosion current density (Icorr of FIG. 13 ) of 8.99 X 10 ^-10 A/cm ² . In addition, the anticorrosive efficiency of the metal coating according to Experimental Example 3-2 was measured to be 99.98%.

In addition, referring to FIG. 13 , the corrosion potential (Ecorr of FIG. 13 ) of the metal coating according to Experimental Example 3-2 of the present invention was measured to be higher than that of Comparative Example 3-2.

Thus, in the metal coating according to Experimental Example 3-2 of the present invention, it can be verified that the silicone oil supported on the porous structure of the oxide film 20 fills the scratch on the surface of the metal 10 and self-repairs. .

Referring back to FIG. 13 , in the above-described potentiometric polarization test results, the corrosion current density (Icorr in FIGS. 8 and 13) measured in the metal coating according to Experimental Example 4-1 was 5.64 X 10 ^-11 A/ cm2 ^. In addition, the anticorrosive efficiency of the metal coating according to Experimental Example 4-1 was measured to be 99.99%.

Meanwhile, the metal coating according to Comparative Example 4-2 had a corrosion current density (Icorr in FIG. 13 ) of 1.29 X 10 ^-6 A/cm ² . In addition, the anticorrosive efficiency of the metal coating according to Comparative Example 4-2 was measured to be 84.89%.

It can be analyzed that, in the metal coating according to Comparative Example 4-2, the scratch is formed, so that the corrosion current density is increased and the corrosion resistance is lowered, while the self-recovery is not.

On the other hand, in contrast to this, the metal coating according to Experimental Example 4-2 had a corrosion current density (Icorr in FIG. 13 ) of 4.08 X 10 ^-9 A/cm ² . In addition, the anticorrosive efficiency of the metal coating according to Experimental Example 4-2 was measured to be 99.67%.

In addition, referring to FIG. 13 , the corrosion potential (Ecorr of FIG. 13 ) of the metal coating according to Experimental Example 4-2 of the present invention was measured to be higher than that of Comparative Example 4-2.

Thus, in the metal coating according to Experimental Example 4-2 of the present invention, it can be verified that the silicone oil supported on the porous structure of the oxide film 20 fills the scratch on the surface of the metal 10 and self-repairs. .

Above, according to the results of the electrostatic polarization test with reference to FIG. 13, the corrosion current density of the metal coating 100 according to Experimental Examples 1-2 to 4-2 of the present invention is, Comparative Examples 1-2 to Comparative Examples 4 It can be seen that it is lower than the metal according to -2.

In addition, it can be seen that the corrosion potential of the metal coating 100 according to Experimental Examples 1-2 to 4-2 of the present invention is higher than those of Comparative Examples 1-2 to 4-2.

Accordingly, the metal coating 100 formed according to the experimental examples of the present invention is supported on the porous structure of the oxide film 20 even when damage such as scratches and cracks occurs on the surface of the metal 10 as described above. It can be demonstrated that the surface of the metal 10 can self-repair by filling the scratches and/or cracks on the surface of the metal 10 by using the silicone oil.

This is, as described above, according to an embodiment of the present invention, the oxide film 20 on the surface of the metal 10 is formed in a porous structure, and the silicone oil layer 30 formed on the oxide film 20 ) because the silicone oil can be supported on the porous structure.

As mentioned above, although the present invention has been described in detail using preferred embodiments, the scope of the present invention is not limited to specific embodiments and should be construed according to the appended claims. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

10: metal
20: oxide film
30: silicone oil layer

Claims (12)

an oxide film formed on the metal surface; and
a silicone oil layer formed on the oxide film;
An oxide group of the oxide film and silicon of the silicone oil layer are combined to form a bonding structure.
The method of claim 1,
The oxide film has a porous structure,
The porous structure, including a porosity of 10% or more to 60% or less, the metal coating.
The method of claim 1,
The silicone oil of the silicone oil layer,
When a scratch occurs on the metal surface,
wherein the metal surface is self-repairing by filling in scratches on the metal surface.
4. The method of claim 3,
After the self-recovery, than when the scratch occurs,
A metal coating, wherein the metal has a low corrosion current density and a high corrosion potential.
The method of claim 1,
The metal includes at least one of magnesium, aluminum, stainless steel, and copper.
preparing the metal;
forming an oxide film on the metal surface; and
Including; forming a silicone oil layer on the oxide film;
The step of forming the silicone oil layer,
A metal coating method comprising the step of bonding the oxide group of the oxide layer to the silicon of the silicone oil layer to form a bonding structure.
7. The method of claim 6,
The oxide film of the step of forming the oxide film has a porous structure,
The porous structure, including a porosity of 10% or more to 60% or less, a metal coating method.
7. The method of claim 6,
After the step of forming the silicone oil layer, than before the step of forming the silicone oil layer,
The metal coating method, comprising a low corrosion current density of the metal and the same or higher corrosion potential.
7. The method of claim 6,
The silicone oil of the silicone oil layer of the step of forming the silicone oil layer,
When a scratch occurs on the metal surface,
A metal coating method comprising: self-healing of the metal surface by filling in scratches on the metal surface.
10. The method of claim 9,
After the self-recovery, than when the scratch occurs,
A metal coating method comprising a low corrosion current density of the metal and a high corrosion potential.
7. The method of claim 6,
Forming the silicone oil layer, further comprising the step of heat treatment,
The heat treatment is performed at room temperature or higher to 300 °C or lower, a metal coating method.
7. The method of claim 6,
The metal includes at least one of magnesium, aluminum, stainless steel, and copper.

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