KR20200056689A - Gradation Method of Magnesium member and Magnesium Product with a Gradation Layer - Google Patents

Abstract

The present invention relates to a gradation method of a magnesium member, which comprises: a magnesium member preparation step of preparing a magnesium member containing magnesium; a PEO oxidation film layer forming step of forming a PEO oxidation film layer on a surface of the magnesium member by a plasma electrolytic oxidation technique; and a gradation layer forming step of forming a gradation layer by depositing the same to have a predetermined thickness on an upper surface of the PEO oxidation film layer, wherein the deposition thickness of the gradation layer becomes gradually thinner or thicker from one point of the magnesium member towards another point. According to the present invention, even if a surface of the magnesium member has a complex shape, the gradation method of a magnesium member can evenly form a PEO oxidation film layer with excellent corrosion resistance, abrasion resistance, and electricity insulation, and provides very excellent adhesion characteristics between the PEO oxidation film layer, the magnesium member, and the gradation layer.

Description

Gradation method of magnesium member and magnesium processed product with gradient layer {Gradation Method of Magnesium member and Magnesium Product with a Gradation Layer}

The present invention relates to a method of gradation of a magnesium member, in particular, even if the surface of the magnesium member has a complex shape, it is possible to uniformly form a PEO oxide film layer excellent in corrosion resistance, abrasion resistance and electrical insulation, and the PEO oxide layer and the magnesium The present invention relates to a method for gradation of a magnesium member having excellent adhesion properties to a member and a gradation layer.

The magnesium member is a lightweight material, but has poor corrosion resistance, and thus has many limitations for use as an auto parts material. In the case of magnesium alloys produced in Korea, it is generally produced as a plate material, and it is easy to generate oxides or oxide films as impurities on the surface when it meets oxygen in the atmosphere. However, there is a problem in that surface quality is not good by causing film defects.

Therefore, it is very important to remove the impurity oxide of the magnesium member in the surface treatment of magnesium, and this pre-treatment process has become an essential process for eliminating secondary problems.

In general, when removing the impurity oxide film on the magnesium surface, a lot of chemical solutions are used to maintain the surface uniformity of the material. The etching solution used at this time may also include glacial acetic acid and nitrate.

However, even if the impurity oxide film generated on the surface of the magnesium member is removed with a chemical solution, the material such as magnesium alloy has a problem that oxidation easily proceeds in an atmospheric environment or in a wet surface treatment process. In particular, there is also a problem that the impurity oxide film produced by contact with the atmosphere is very thin and has poor adhesion to a primer layer or a gradient layer.

Therefore, since the stable operation of the subsequent process is difficult only by removing the impurity oxide film by the chemical solution, an additional surface treatment process for stabilizing the subsequent process is required.

The present invention has been devised to solve the above problems, and its purpose is to uniformly form a PEO oxide film layer excellent in corrosion resistance, abrasion resistance, and electrical insulation even if the surface of the magnesium member has a complicated shape, and the PEO oxide film layer And to provide an improved method of gradation of a magnesium member so that the adhesion properties between the magnesium member and the gradation layer are very excellent.

Another object of the present invention is to provide an improved magnesium processed product so that the PEO oxide layer and the magnesium member and the gradation layer have excellent adhesion properties.

In order to achieve the above object, the gradient method of the magnesium member according to the present invention includes: a magnesium member preparation step of providing a magnesium member containing magnesium; Forming a PEO oxide layer on the surface of the magnesium member by plasma electrolytic oxidation; It is formed by depositing a predetermined thickness on the upper surface of the PEO oxide layer, forming a gradient layer to form a gradient layer that becomes thinner or thicker as the deposition thickness increases from one point to another point of the magnesium member. It is characterized by.

Here, in the step of forming the gradient layer, it is preferable that the gradient layer is formed on the top surface of the PEO oxide layer by DC sputtering.

Here, in the step of forming the gradation layer, the deposition is performed in a state in which a shield that is movably disposed on the surface of the deposition material covers a part of the deposition material, so that a gradation layer having a deposition portion and an undeposition portion is formed. desirable.

Here, the preparing the magnesium member may include: removing an impurity oxide film formed on the surface of the magnesium member; After performing the impurity oxide film removal step, it is preferable to include; a first cleaning step of removing impurities remaining on the surface of the magnesium member using a cleaning solution.

Here, after performing the PEO oxide film forming step, a second cleaning step of removing impurities remaining on the surface of the PEO oxide layer using a cleaning solution; A primer layer forming step of forming a primer layer having a predetermined thickness on the top surface of the PEO oxide layer; After performing the primer layer forming step, it is preferable to further include a drying step of removing the residual moisture to dry the surface of the primer layer.

Here, after performing the step of forming the gradient layer, it is preferable to further include; a protective layer forming step of forming a protective layer for protecting the gradient layer.

Magnesium processed product according to the present invention to achieve the other object, the magnesium member; A PEO oxide layer formed on the surface of the magnesium member by a plasma electrolytic oxidation technique; It is characterized in that it comprises; it is formed to be deposited to have a predetermined thickness on the upper surface of the PEO oxide layer, and the gradient layer becomes thinner or thicker as the deposition thickness increases from one point to another point of the magnesium member.

Here, the PEO oxide layer is formed of a porous layer having a thickness of 5 to 15㎛, the gradient layer is formed on the top surface of the PEO oxide layer by DC sputtering method, the predetermined thickness on the top surface of the PEO oxide layer A primer layer formed to have a; It is preferable to further include; a protective layer formed on the top surface of the gradient layer.

According to the present invention, a magnesium member preparing step of providing a magnesium member including magnesium; Forming a PEO oxide layer on the surface of the magnesium member by plasma electrolytic oxidation; It is formed by depositing a predetermined thickness on the upper surface of the PEO oxide layer, forming a gradient layer to form a gradient layer that becomes thinner or thicker as the deposition thickness increases from one point to another point of the magnesium member. Therefore, even if the surface of the magnesium member has a complicated shape, the PEO oxide film layer excellent in corrosion resistance, abrasion resistance, and electrical insulation can be uniformly formed, and adhesion properties between the PEO oxide film layer and the magnesium member and the gradient layer It has the effect of being very good.

1 is a flow chart for explaining the gradient method of the magnesium member, which is an embodiment of the present invention.
2 is a cross-sectional view showing a magnesium processed product according to an embodiment of the present invention.
3 is a view showing a state in which the shield (C) is attached to the deposition material (T).
4 is a view showing a state in which the shield (C) can be moved up and down with respect to the deposition material (T) shown in FIG. 3.
5 shows that when the shield (C) is located in the middle of the deposition material (T), an undeposited portion (ND) is formed in the middle portion of the object (M) and a deposition portion (in the upper and lower parts of the object (M)) It is a figure which shows the state in which D) was formed.
FIG. 6 is a view showing a state in which an undeposited portion ND is formed on an upper portion of an object M when the shield C is located at an upper portion of the deposition material T.
FIG. 7 is a view showing a state in which an undeposited portion ND is formed at a lower end of an object M when the shield C is located at a lower end of the deposition material T.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart for explaining a gradient method of a magnesium member, which is an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a magnesium processed product which is an embodiment of the present invention. 3 is a view showing a state in which the shield (C) is attached to the deposition material (T).

1 to 2, the method of gradation of a magnesium member according to a preferred embodiment of the present invention is a method for treating a surface of a magnesium member that can be used as a member such as an engine compartment cover as an automobile part, and a step of providing a magnesium member. , PEO oxide layer forming step (S30), second cleaning step (S40), primer layer forming step (S50), drying step (S60), gradient layer forming step (S70), protective layer forming step ( S80).

The preparing of the magnesium member is a step of preparing a magnesium member 10 including magnesium, and in the present embodiment, the preparing of the magnesium member includes an impurity oxide film removing step (S10) and a first cleaning step (S20). . Hereinafter, it will be described on the assumption that the magnesium member 10 is a magnesium plate material formed by a high-frequency heat press technique and has a thickness of approximately 0.5 to 3 mm.

The impurity oxide film removal step (S10) is a step of removing the impurity oxide film formed on the surface of the magnesium member 10. In this embodiment, the impurity oxide film is removed using an etching solution. The acidic etching solution used for this contains 100-1000 ml / L glacial acetic acid and 30-60 ml / L sodium nitrate with respect to 1000 ml / L of water.

When the surface treatment is performed for 30 to 300 seconds at an atmospheric temperature using the etching solution, the chemical etching of the surface of the magnesium member 10 can be uniformly performed within 0.05 to 4 μm.

On the other hand, an alkali etching solution may be used instead of the acidic etching solution, wherein the alkali etching solution comprises 20 to 80% by weight of triethanolamine, 5 to 40% by weight of ethylenediaminetetraacetic acid (EDTA) and 20 to 40% by weight of sodium hydroxide. It can contain.

When using the alkali etching solution, it is preferable to deposit for 2 to 8 minutes at a pH range of 9 to 10.5 and atmospheric temperature.

When using the acidic etching solution, it has a feature of uniformizing the surface energy, and also serves to stabilize the magnesium member 10 during a chemical reaction. By using such an acidic etching solution, a uniform chemical reaction can be caused at the time of forming the PEO oxide film layer 20 to be described later, and a relatively dense PEO oxide film layer 20 can be obtained. (Impurity oxide film removal step; S10)

The first cleaning step (S20) is a step of removing impurities remaining on the surface of the magnesium member 10 using a cleaning solution after the impurity oxide film removal step (S10) is performed.

The first cleaning step (S20), the main purpose is to remove the etching solution remaining on the surface of the magnesium member 10. In this embodiment, distilled water is used to remove the impurities, and the conductivity of the distilled water is 0.065 to 0.045 Pa / cm and resistance 17 to 19 Pa / cmD. (First cleaning step; S20)

The PEO oxide layer forming step (S30) is a step of forming the PEO oxide layer 20 on the surface of the magnesium member 10 after performing the first cleaning step (S20). In this embodiment, a plasma electrolytic oxidation method (PEO; Plasma Electrolytic Oxidation) is used to form the PEO oxide layer 20.

The plasma electrolytic oxidation method (hereinafter referred to as “PEO method”) generally forms a PEO oxide layer by applying a high voltage pulse of 300 to 600 V in a water-soluble electrolyte solution, and is applied to a micro arc plasma generated on a metal surface due to high voltage. It is normal for the molten metal to be oxidized to become a surface coating.

In this embodiment, the electrolyte is, for 1000 g of pure water, potassium hydroxide (KOH) 0.4 to 2 g, sodium phosphate (Na ₃ PO ₄ ) 1 to 15 g, sodium hydroxide (NaOH) 200 to 300 g, aluminum powder 1 to 3 g It contains.

On the other hand, in this embodiment, instead of a high voltage of 300 to 600 V, a low voltage of 50 to 70 V is used, the current is approximately 30 to 40 A, and the time for applying the current is 3 to 5 minutes.

In this embodiment, the PEO oxide layer 20 is formed of a porous layer having a thickness of 5 to 15㎛.

When the PEO method is used, a uniform PEO oxide film layer 20 can be formed on a surface having a complicated shape, and excellent adhesion properties between the formed PEO oxide film layer 20 and the magnesium member 10 as a base material can be maintained. , The PEO oxide layer 20 is excellent in corrosion resistance, abrasion resistance, electrical insulation, and the like, and adhesion of paint or paint by post-processing can be improved. (PEO oxide layer forming step; S30)

The second cleaning step (S40) is a step of removing the impurities remaining on the surface of the PEO oxide layer 20 by using a cleaning solution after performing the PEO oxide film forming step (S30).

The second cleaning step (S40), the main purpose is to remove the electrolyte solution remaining on the surface of the PEO oxide layer 20. In this embodiment, distilled water is used to remove the impurities, and the conductivity of the distilled water is 0.065 to 0.045 Pa / cm and resistance 17 to 19 Pa / cmD. (Second washing step; S40)

The primer layer forming step (S50) is a step of forming a primer layer 30 having a predetermined thickness on an upper surface of the PEO oxide layer 20.

The primer layer 30, alkyd resin, phthalic acid resin, acrylic resin, epoxy resin, polyurethane resin, vinyl chloride resin, silicone resin, fluorine resin, melamine resin, isocyanate resin, Kuroman resin, petroleum resin, rosin, nose At least selected from the group consisting of parous resin, cerac resin, oil alkyd, chlorinated rubber lacquer resin, silicate resin, unsaturated polyester resin, amino alkyd, polyester, urea, fluorine, vinyl acetate, vinyl chloride, acrylic synthetic rubber, and epoxy. It is preferred to include one. In this embodiment, the primer layer 30 contains a polyurethane resin, and the thickness is 8-25 µm. (Primer layer forming step; S50)

The drying step (S60) is a step of drying the surface of the primer layer 30 by removing the residual moisture after performing the primer layer forming step (S50). In this embodiment, after naturally drying for 5 to 15 minutes, it is dried for about 60 minutes using hot air at a temperature of 85 to 90 ° C. (Drying step; S60)

The gradation layer forming step (S70) is a step of forming a gradation layer 40 having a predetermined thickness on an upper surface of the primer layer 30.

The gradation layer 40 is a layer in which the deposition thickness becomes thinner or thicker as it goes from one point to another point of the magnesium member 10, which is the object M to be coated, as shown in FIGS. 5 to 7.

In this embodiment, the gradient layer 40 is formed by a DC sputtering method. The DC sputtering method is a kind of sputtering method, and is a vacuum deposition method commonly used in integrated circuit production line processes.

In general, sputtering (sputtering) method, the plasma at a relatively low vacuum to accelerate the gas, such as ionized argon, to collide with a target that is a deposition material (T), and eject atoms to form a substrate (M), such as a wafer or glass. It means how to make a membrane. Here, the target side in the sputtering equipment is set as a cathode, and the substrate side is set as an anode.

The process of sputtering starts from a collision between electrons generated from gas supplied into the chamber. Looking at the process, an inert gas such as argon gas is put into a vacuum chamber, and electrons emitted from the cathode are applied when a voltage is applied to the cathode. They collide with argon gas atoms, ionizing argon. In this way, when the argon is excited and emits electrons, energy is released, and at this time, a glow discharge occurs to show a purple plasma in which ions and electrons coexist. The + ions of argon in the plasma are accelerated toward the target, which is the cathode by a large potential difference, and when colliding with the surface of the target, neutral target atoms pop out to form a thin film on the substrate.

Sputtering (Sputtering) method has the advantage of excellent uniformity of the resulting thin film thickness, can use a target of a large area, excellent adhesion of the thin film. Examples of the sputtering method include a DC sputtering method and an RF sputtering method.

The DC sputtering method used in this embodiment is a sputtering method using a DC power source, the structure is simple, the film formation rate is almost constant for various types of metals, and the current amount and the thickness of the thin film are almost Since it is directly proportional, it is easy to control the thickness, and has a great advantage in that the film formation speed is large, the uniformity of the thin film is high, and the adhesion strength is high because it is a high energy process.

However, the DC sputtering (DC Sputtering) method has a disadvantage in that the target is an oxide or an insulator, and the RF sputtering method using a high frequency power of 13.56 MHz is used to compensate for this disadvantage. do. However, the RF sputtering (RF Sputtering) method has a disadvantage that the deposition rate is relatively low and the deposition area is relatively small.

In this embodiment, before the DC sputtering method is performed, the surface of the primer layer 30 is first modified by a plasma pretreatment method. At this time, the power is 2.5 ~ 5kw, the vacuum degree is 8 × 10 ^-5 torr, the gas amount is 400 sccm, and the cleaning time is about 160 seconds.

Subsequently, under the condition of a vacuum degree of 5 to 7 × 10 ^-5 torr, a power of 10 to 17 kw is applied for about 40 to 120 seconds to vaporize the deposition material T, and the vaporized deposition material T is the primer layer 30 ).

At this time, the metal (target) that can be used as the deposition material (T) is aluminum (Al). SUS. Tin (Sn). Copper (Cu). Titanium (Ti). Silver (Ag). Chromium (Cr). Nickel (Ni). And at least one selected from the group consisting of molybdenum (Mo).

In this embodiment, in the step of forming the gradient layer (S70), deposition is performed in a state in which a shield (C) that is movably disposed on the surface of the deposition material (T) covers a part of the deposition material (T). , As illustrated in FIGS. 5 to 7, the gradation layer 40 is provided with a deposition part D and a non-deposition part ND. Here, the non-deposited portion ND does not only mean a place where there is no deposition, but may mean a portion where deposition is relatively less.

For example, as shown in FIG. 5, when the shield C is located in the middle of the deposition material T, and the magnesium member 10 as the object M is also disposed in the middle of the deposition material T In, an un-deposited portion ND is formed in an intermediate portion of the magnesium member 10, which is an object M, and a deposition portion D is formed in an upper portion and a lower portion of the object M.

If, as shown in Figure 6, the shield (C) is located on the upper end of the evaporation material (T), and the magnesium member (10), which is the object (M), is also disposed on the upper end of the evaporation material (T), An undeposited portion ND is formed at an upper end portion of the magnesium member 10 as an object M to be coated.

Conversely, as illustrated in FIG. 7, when the shield C is located at the lower end of the deposition material T, and the magnesium member 10 as the object M is also disposed at the lower end of the deposition material T, the object to be coated An un-deposited portion ND is formed at the lower end of (M). (Gradient layer forming step; S70)

The protective layer forming step (S80) is a step of forming the protective layer 50 for protecting the gradient layer 40 after performing the gradient layer forming step (S70).

The protective layer 50, alkyd resin, phthalic acid resin, acrylic resin, epoxy resin, polyurethane resin, vinyl chloride resin, silicone resin, fluorine resin, melamine resin, isocyanate resin, Kuroman resin, petroleum resin, rosin, nose Parus resin, Serak resin, oil alkyd, chlorinated rubber lacquer resin, silicate resin. It is formed by applying at least one selected from the group consisting of unsaturated polyester resin, amino alkyd, polyester, urea, fluorine, vinyl acetate, vinyl chloride, acrylic synthetic rubber, and epoxy to the top surface of the gradient layer 40.

The protective layer 50 may be formed in a polished, semi-glossy, or matte state, or may be formed in a transparent or semi-transparent state, and may be formed to include a color paint or a stain paint of a predetermined color.

Here, the color paint to the stain paint, coloring pigments (zinc, titanium, yellow, carbon black), metal powder (silver powder, gold powder, aluminum, alloy minerals), sieving pigment (calcium carbonate, talc, barium sulfate, silica) , Zion pigment may be used at least one selected from the group consisting of.

Thus, the protective layer 50 is formed on the gradient layer 40, thereby completing the magnesium processed product 100. (Step of forming a protective layer; S80)

When using the above-described gradient method of the magnesium member, as shown in FIG. 2, the magnesium member 10, PEO oxide film layer 20 formed on the surface of the magnesium member 10 by plasma electrolytic oxidation technique, the A primer layer 30 formed to have a predetermined thickness on the upper surface of the PEO oxide layer 20, a gradient layer 40 formed to have a predetermined thickness on the upper surface of the primer layer 30, and the gradient layer 40 Magnesium processed product 100 having a protective layer 50 formed on the upper surface of the can be manufactured.

The above-described method for gradation of a magnesium member includes a magnesium member provision step of providing a magnesium member 10 containing magnesium; A PEO oxide film layer forming step (S30) of forming a PEO oxide film layer 20 on the surface of the magnesium member 10 by plasma electrolytic oxidation technique; The PEO oxide layer 20 is deposited and formed to have a predetermined thickness on the upper surface, and the gradient thickness 40 becomes thinner or thicker as the deposition thickness increases from one point to another point of the magnesium member 10. Forming a gradient layer forming step (S70); so, even if the surface of the magnesium member 10 has a complicated shape, it is possible to uniformly form the PEO oxide film layer 20 having excellent corrosion resistance, abrasion resistance, and electrical insulation. In addition, there is an advantage that the PEO oxide layer 20, the magnesium member 10 and the gradient layer 40 have excellent adhesion properties.

In addition, in the gradation method of the magnesium member, in the gradation layer formation step (S70), the gradation layer 40 is formed on the top surface of the PEO oxide layer 20 by the DC sputtering method, so sputtering using DC power ( As a sputtering method, the structure is simple, the film formation rate is almost constant for various types of metal deposition materials (T), and the current amount and the film thickness are almost directly proportional, so thickness control is easy and compared to the RF sputtering method. The film formation speed is high, the uniformity of the thin film is large, and it is a process of high energy, so it has the advantage of high adhesion strength.

In addition, in the method of gradation of the magnesium member, in the step of forming the gradient layer (S70), a shield C movably disposed on the surface of the deposition material T covers a part of the deposition material T. As the deposition is performed, a gradation layer 40 having a deposition portion D and a non-deposition portion ND is formed, so that the deposition portion D and the non-deposition portion ND as illustrated in FIGS. 5 to 7 are formed. There is an advantage that it is easy to artificially adjust the position of the.

In addition, the method of gradation of the magnesium member may include the step of providing the magnesium member, removing the impurity oxide film formed on the surface of the magnesium member 10 (S10); After performing the impurity oxide film removal step (S10), a first cleaning step (S20) of removing impurities remaining on the surface of the magnesium member 10 using a cleaning solution; includes, so that the impurity oxide film There is an advantage in that the adhesion between the magnesium member 10 and the PEO oxide layer 20 is not deteriorated, and film defects are not induced, thereby improving the surface quality.

In addition, the gradient method of the magnesium member, after performing the PEO oxide film forming step (S30), a second cleaning step (S40) of removing impurities remaining on the surface of the PEO oxide layer 20 using a cleaning solution; A primer layer forming step (S50) of forming a primer layer 30 having a predetermined thickness on the top surface of the PEO oxide layer 20; After performing the primer layer forming step (S50), removing the residual moisture to dry the surface of the primer layer 30 (S60); further comprising, so, the surface of the PEO oxide layer 20 Even when the smoothness is low and not smooth, the smoothness of the upper surface of the primer layer 20 can be increased, so that the gradient layer 40 can be smoothly formed, and the gradient layer ( 40) has the advantage that can be more firmly attached to the PEO oxide layer 20.

And the gradient method of the magnesium member, after performing the gradient layer forming step (S70), forming a protective layer 50 for protecting the gradient layer 40 (S80); Since it is included, it is possible to prevent the gradation layer 40 from being damaged by an external impact, and there is an advantage of generating a decorative effect by the protective layer 50.

The above-described magnesium processed product 100 includes a magnesium member 10; PEO oxide film layer 20 formed on the surface of the magnesium member 10 by plasma electrolytic oxidation technique; A gradient layer 40 that is deposited and formed to have a predetermined thickness on the top surface of the PEO oxide layer 20, and the thickness of the deposition becomes thinner or thicker as it moves from one point to another point of the magnesium member 10; Since it includes, even if the surface of the magnesium member 10 has a complicated shape, it is possible to uniformly form the PEO oxide film layer 20 having excellent corrosion resistance, abrasion resistance, and electrical insulation, and the PEO oxide film layer 20 The magnesium member 10 and the gradient layer 40 has the advantage of excellent adhesion properties.

And the magnesium processed product 100, the PEO oxide layer 20 is formed of a porous layer having a thickness of 5 to 15㎛, the gradient layer 40 of the PEO oxide layer 20 by the DC sputtering method A primer layer 30 formed on an upper surface and having a predetermined thickness on the upper surface of the PEO oxide layer 20; Since it further includes a protective layer 50 formed on the top surface of the gradient layer 40, the top surface smoothness of the primer layer 20 can be increased, so that the gradient layer 40 can be smoothly formed, It is possible to prevent the gradation layer 40 from being damaged by an external impact, and there is an advantage of generating a decorative effect by the protective layer 50.

The present invention has been described above, but the technical scope of the present invention is not limited to the contents described in the above-described embodiments, and the equivalent configuration modified or changed by a person having ordinary knowledge in the relevant technical field is technical of the present invention. It is clear that it is within the scope of thought.

＊ Explanation of codes for the main parts of the drawing ＊
100: magnesium processed product
10: absence of magnesium
20: PEO oxide layer
30: primer layer
40: gradient layer
50: protective layer
C: Shield
D: Deposition part
ND: Non-deposition part
M: Object
T: Deposition material

Claims (8)

A magnesium member preparation step of preparing a magnesium member including magnesium;
Forming a PEO oxide layer on the surface of the magnesium member by plasma electrolytic oxidation;
Forming a gradient layer to form a gradient layer that is deposited and formed to have a predetermined thickness on the upper surface of the PEO oxide layer, and gradually increases or decreases the thickness of the deposition from one point to another point of the magnesium member; Gradient method of the absence of magnesium, characterized in that According to claim 1,
In the step of forming the gradient layer,
Gradient method of the magnesium member, characterized in that the gradient layer is formed on the top surface of the PEO oxide layer by DC sputtering method According to claim 1,
In the step of forming the gradient layer,
Gradient method of the magnesium member, characterized in that a gradation layer having a deposition portion and an undeposited portion is formed by depositing a shield which is movably disposed on the surface of the deposition material while covering a portion of the deposition material. According to claim 1,
The magnesium member preparation step,
An impurity oxide film removing step of removing the impurity oxide film formed on the surface of the magnesium member;
After performing the step of removing the impurity oxide film, a first cleaning step of removing impurities remaining on the surface of the magnesium member using a cleaning solution; Gradient method of the magnesium member comprising a According to claim 1,
After performing the PEO oxide film forming step, a second cleaning step of removing impurities remaining on the surface of the PEO oxide layer using a cleaning solution;
A primer layer forming step of forming a primer layer having a predetermined thickness on the top surface of the PEO oxide layer;
After performing the primer layer forming step, the drying step of removing the residual moisture to dry the surface of the primer layer; Gradient method of the magnesium member further comprising a According to claim 1,
After performing the step of forming the gradient layer, forming a protective layer for forming a protective layer for the protection of the gradient layer; Gradient method of the magnesium member further comprising a Absence of magnesium;
A PEO oxide layer formed on the surface of the magnesium member by a plasma electrolytic oxidation technique;
It is formed by depositing a predetermined thickness on the upper surface of the PEO oxide layer, and the gradient layer becomes thinner or thicker as the deposition thickness increases from one point to another point of the magnesium member. Magnesium processed products The method of claim 7,
The PEO oxide layer is formed of a porous layer having a thickness of 5 to 15㎛,
The gradient layer is formed on the top surface of the PEO oxide layer by DC sputtering,
A primer layer formed to have a predetermined thickness on the top surface of the PEO oxide layer;
Magnesium processed product having a gradient layer characterized in that it further comprises a; protective layer formed on the upper surface of the gradient layer

Images