KR101576987B1 - Method for producing magnesium materials - Google Patents

Abstract

The present invention relates to a method for producing a magnesium material, and provides a method for manufacturing a magnesium material such as a magnesium magazine using an anodic oxidation and coating technique.

Description

[0001] The present invention relates to a method for producing magnesium materials,

The present invention relates to a method for manufacturing a magnesium material, and more particularly, to a method for manufacturing a magnesium material such as a magnesium magazine using an anodizing and coating technique.

Magnesium is the lightest metal in the world, and has a specific gravity of 1.74 g / ㎤. Magnesium has a specific gravity of 2/3 of that of aluminum alloy and less than 1/4 of that of steel. It is the lightest metal material, has high non-strength, and excellent vibration absorption. In addition, since magnesium has low cutting resistance and excellent dimensional stability, it has an ideal property as a structural material, and hence the use of industrial materials varies. However, since magnesium has a property of being easily chemically corroded, the use range is limited.

That is, the magnesium alloy is corroded by corrosive substances such as acid rain in the atmosphere and salinity, and humidity and temperature. Corrosion begins when the relative humidity is above 30%, severe corrosion problems occur when exposed to acid rain, and the rate of corrosion increases rapidly in high summer temperatures. In addition, atmospheric pollutants such as carbon dioxide, sulfur dioxide gas, chlorine gas, and nitrogen gas compounds present in the atmosphere are important factors promoting the corrosion of magnesium alloys.

Magnesium alloys are future-proof materials that meet global issues of conservation and environmental conservation. In the developed countries, electric appliances exterior materials and automobile parts are being put into practical use by using plate materials. In the future, various technologies are being developed for application to automobile exterior materials. For this purpose, it is essential to develop surface modification technology in addition to coating technology to improve corrosion resistance, which is one of the weakest fields of magnesium alloys.

Recently, with the advancement of the anodic oxidation treatment technique and coating technology, the light machining and light shielding performance of optical devices, broadcast equipment parts, batteries, communication parts, automobile parts, and the like are improved by utilizing the excellent machinability and high strength characteristics of magnesium alloys It can be secured, and demand is increasing rapidly. Particularly, weight saving of transportation equipment representing automobiles has been studied and developed in the past. Recently, electric vehicles (EV), hybrid (PHEV) and fuel cell vehicles (FCEV) have been developed as a countermeasure against the problem of mass production of carbon dioxide gas that affects the global environment and depletion of fossil fuel. Techniques for applying magnesium alloys to automotive parts are actively being developed.

In Korea, demand for magnesium products is increasing. However, due to the difficulty in securing the corrosion resistance of magnesium materials, there are many difficulties in applying them, and development of anodic oxidation surface treatment technology of magnesium alloy materials is actively being attempted.

An object of the present invention is to provide a method for producing a magnesium material having excellent physical properties such as light weight, corrosion resistance, hardness and abrasion resistance.

In order to accomplish the above object, the present invention provides a method of manufacturing a semiconductor device, comprising: anodizing a magnesium or magnesium alloy; And coating a coating liquid containing polytetrafluoroethylene, sodium lauryl sulfate, silicone resin, octylphenoxy polyethoxy ethanol, toluene, diethylene glycol monobutyl ether, water, and xylene. ≪ / RTI >

In the present invention, the magnesium alloy may contain 2.7 to 2.8% by weight of aluminum, 0.93 to 1.05% by weight of zinc, 0.05 to 0.12% by weight of Mn, and the balance of magnesium.

In the present invention, the anodic oxidation can be performed by plasma electrolytic oxidation.

In the present invention, the electrolytic solution for anodizing may contain 10 to 30 g / L of potassium hydroxide, 10 to 30 g / L of sodium hydroxide, 10 to 50 g / L of sodium silicate, and 1 to 10 g / L of sodium phosphate.

In the present invention, the corrosion resistance according to the 5% NaCl salt spray test of the magnesium material may be 300 to 1000 hours, the surface resistance may be 10 ⁸ to 10 ^8.5 Ω, and the hardness may be 250 to 300.

According to the present invention, a magnesium alloy kitchen appliance and a magazine having excellent properties such as corrosion resistance and abrasion resistance through plasma-electrolytic oxidation (PEO) technology and a magnesium mixed surface treatment technology combining a functional coating solution for improvement of physical properties such as corrosion resistance and abrasion resistance Of magnesium can be provided. In particular, magnesium magazines can replace existing aluminum magazines.

1 is a view illustrating a manufacturing process of a magnesium material according to the present invention.
2 is a photograph of a magnesium magazine according to the present invention.
3 is a photograph of a conventional aluminum magazine.

Hereinafter, the present invention will be described in detail.

The present invention relates to a method of manufacturing a magnesium material such as a kitchen utensil and a magazine.

A method of manufacturing a magnesium material according to the present invention includes an anodizing step and a coating step.

Anodic oxidation

In the anodizing step, magnesium or a magnesium alloy can be used, and a magnesium alloy can be preferably used. The magnesium alloy preferably contains 2.7 to 2.8% by weight of aluminum, 0.93 to 1.05% by weight of zinc, 0.05 to 0.12% by weight of Mn, and the balance of magnesium. When a magnesium alloy having such a composition is used, a magnesium product having excellent physical properties can be obtained.

The anodic oxidation may preferably be performed by plasma electrolytic oxidation (PEO).

Electrolytic oxidation refers to an oxidation reaction occurring on the anode during electrolysis, and refers to an oxidation reaction performed on the anode with respect to molecules or ions in the electrolyte using electrolysis. Electrolytes are put into the electrolytic solution to send an electric current, and chemical decomposition is caused by the polarity movement of the ions. When a certain decomposition voltage is sent to the electrode and electrolyzed in solution, the metal dissolves in the anode to generate oxygen or chlorine, and the ion or compound is oxidized. Compared to other oxidations, there is an advantage that the purity of the product is good without requiring an oxidizing agent.

Plasma electrolytic oxidation refers to electrolytic oxidation using plasma. It is a plasma coating technology mainly used for light, light metal surfaces such as magnesium, aluminum, and titanium. This technology first strengthens the surface strength of the product, thereby preventing product damage due to scratches and corrosion due to external factors, and forming a uniform coating layer to increase the adsorption force between the coating layers during the color coating process, And boasts excellent painting power. In addition, unlike conventional anodizing and chrome plating, it is lead-free, odorless, and non-toxic, and it is evaluated as a nature-friendly technology because it does not generate toxic substances during the process. It can be applied to most devices and materials that come into contact with human bodies such as mobile phones, notebook computers, automobiles, etc., which are used in real life because there is no harm to human body.

The electrolytic solution for the anodic oxidation preferably contains 10 to 30 g / L of potassium hydroxide, 10 to 30 g / L of sodium hydroxide, 10 to 50 g / L of sodium silicate, and 1 to 10 g / L of sodium phosphate. When an electrolyte having such a composition is used, a magnesium product having excellent physical properties can be obtained.

It is preferable that the optimum temperature of the electrolytic solution is 15 to 30 占 폚 and the pH is an aqueous alkaline solution of 12.0 to 13.0. Agitation in anodic oxidation is essential, voltage of anodic oxidation requires a high voltage of 150 to 260 V, and anodization time is preferably 30 to 50 minutes.

The anodic oxidation may form an oxide film on the surface of the magnesium or magnesium alloy.

coating

In the coating step, the functional coating liquid is coated on the oxide film of the anodized magnesium or magnesium alloy.

The coating liquid preferably contains polytetrafluoroethylene, sodium lauryl sulfate, silicone resin, octylphenoxy polyethoxy ethanol, toluene, diethylene glycol monobutyl ether, water, and xylene. When a coating solution having such a composition is used, a magnesium product having excellent physical properties can be obtained.

Specifically, the coating liquid contains 1 to 90% by weight of polytetrafluoroethylene, 0.1 to 30% by weight of sodium lauryl sulfate, 1 to 90% by weight of silicone resin, 0.1 to 30% by weight of octylphenoxypolyethoxyethanol, , 0.1 to 5 wt% of diethylene glycol monobutyl ether, 1 to 90 wt% of water, and 0.1 to 5 wt% of xylene. The evaporation rate of the coating liquid is slower than that of ether and the vapor density is heavier than air and the amount of volatile components is 75 ± 10% by volume and 60 ± 10% by weight, the amount of solids is 40 ± 10% by weight and the boiling point is 100 to 245 ° C. Lt; / RTI >

The coating may be carried out using a conventional coating method, for example, roll coating, spin coating, drop casting, bar coating, gravure coating, blade coating, spray coating, inkjet printing, screen printing and the like. The coating thickness may be from 5 to 60 탆.

FIG. 1 is a perspective view showing a manufacturing process of a magnesium material according to the present invention. The manufacturing process of the present invention is a manufacturing process of a magnesium material according to the present invention. , Anodizing, rinsing, hot water, primary coating, hot water washing, secondary coating, drying, and hot water washing. Some processes may be omitted, other processes may be added, and the process sequence may be changed as needed.

In alkaline degreasing, it can be immersed in an aqueous solution of 80 to 90 ° C mixed with 10 ± 3% of NaOH and 5 ± 3% of a surfactant for 3 to 5 minutes. Washing can be performed for 1 ± 0.5 minutes. The ultrasonic cleaning can be performed for 2 ± 1 minutes. The acid cleaning can be carried out for 15 ± 3 seconds with a solution containing 11 ± 3 mL of sulfuric acid 96 ± 3% per liter and 76 ± 3 mL of 70 ± 3% nitric acid. In the neutralization step, it can be immersed at 30 to 40 ° C for 30 seconds to 1 minute by using 5 ± 3% of NaOH. The hot water washing can be carried out at 90 to 100 ° C for 20 ± 3 minutes. In the coating process, the magnesium material can be coated by immersion in the coating liquid for 20 ± 3 minutes. The drying can be carried out at 80 to 100 ° C for 1 ± 0.5 hours. The last hot water washing can be performed at 90 to 100 ° C for 1 to 5 minutes.

The magnesium material produced according to the present invention has excellent physical properties. Specifically, the corrosion resistance according to the 5% NaCl salt spray test of magnesium is 300 to 1000 hours, the surface resistance is 10 ⁸ to 10 ^8.5 Ω, and the hardness is 250 to 300 . Further, the withstand voltage may be 600 to 1000 V. The anodic oxide film thickness may be 5 to 40 mu m, preferably 10 to 35 mu m, for example, 10 to 12 mu m.

The magnesium material according to the present invention can be used in magazines, kitchen appliances, optical instruments and broadcasting equipment parts, batteries and communication parts, automobile parts, and the like.

Magazine is a part required for the whole process such as front-end, back-end, T & P and similar line of semiconductor manufacturing. After the ingot is sawed, the wafer having completed the show is mounted on the magazine and supplied to the wafer expander.

Conventional magazines use anodized products on the surface of aluminum materials. The problem with using aluminum materials is that they lack dimensional stability in high-temperature environments, and new alternative technologies are needed to solve them.

In the present invention, it is possible to provide a high-temperature stable lightweight magnesium magazine (Mg Magazine) which can replace the existing Al (aluminum) material.

The magnesium magazine which can be produced according to the present invention can achieve a weight reduction of 35 +/- 5% as compared with the aluminum magazine currently used. The specific gravity of aluminum is 2.72 and the specific gravity of magnesium is 1.78. It is possible to obtain effects such as improvement of labor intensity and energy saving of the worker due to the weight reduction.

[Example]

The magnesium magazine was prepared according to the manufacturing process of Fig. 2 is a photograph of a magnesium magazine according to the present invention.

As the magnesium material, 2.75 wt% of aluminum, 0.99 wt% of zinc, 0.08 wt% of Mn, and a magnesium alloy (31AZ Mg alloy) containing the remaining magnesium were used.

The anodic oxidation was performed by plasma electrolytic oxidation. An electrolytic solution containing 20 g / L of potassium hydroxide, 20 g / L of sodium hydroxide, 30 g / L of sodium silicate and 5 g / L of sodium phosphate was used as an electrolyte for the anodic oxidation. The temperature of the electrolytic solution was 23 ° C, and the pH was 12.5. The voltage of the anodic oxidation was 220 V and the anodization time was 40 minutes.

The coating liquid contained 20 wt% of polytetrafluoroethylene, 3 wt% of sodium lauryl sulfate, 10 wt% of silicone resin, 3 wt% of octylphenoxy polyethoxy ethanol, 7 wt% of toluene, 1 wt% of diethylene glycol monobutyl ether, , 55 wt% of water and 1 wt% of xylene was used.

[Comparative Example]

Al Magazine was prepared. The manufacturing process was carried out in the order of machined products, jigs, acid degreasing, washing, alkali etching, washing, neutralization, washing, anodizing, washing, sealing, washing and drying. Alkali etching was performed using 10% NaOH for 30 seconds and anodization was performed using 20% H ₂ SO ₄ electrolyte. 3 is a photograph of a conventional aluminum magazine.

[Test Example]

The physical properties of the magnesium magazine prepared in the examples and the aluminum magazine prepared in the comparative examples were measured, and the results are shown in Table 1.

The film thickness was measured using a non-destructive non-ferrous metal film thickness meter (Salu Tron®).

The corrosion resistance was measured using a salt spray tester. Specifically, the time from the exposure to 5% sodium chloride according to ASTM B-117 to the first appearance of corrosion was measured.

The withstanding voltage was measured by using an understanding voltage tester (Withstanding Voltage Tester, HYPT-10030A).

The surface resistivity was measured using a surface resistance tester (SIMCO, Work Surface Tester, ST-4).

The hardness was measured by Vickers hardness (Hv) using a micro Vickers hardness meter.

Key Performance unit Magnesium anodization
(PEO) magazine Aluminum anodization
(Anodizing) magazine Anodic oxide film thickness ㎛ 10-12 25 to 35 Corrosion resistance
NaCl 5% salt spray test hr 300 or more 300 or more Withstand voltage V 600 1000 Surface resistance Ω 10 ^{8 to 8.5} 10 ^{7 ~ 8} Hv hardness Hv 250-300 200 to 250

As can be seen in Table 1, the magnesium magazine prepared according to the present invention exhibited a similar quality characteristic effect with a smaller film thickness than the aluminum magazine. A magazine is a part used to move a wafer, and its hardness and abrasion resistance are particularly important in its quality characteristics, and its abrasion resistance also rises proportionally at high hardness. Much better quality characteristics can be obtained when higher film thicknesses are raised.

The magnesium magazine produced according to the present invention has a surface resistance higher than that of conventional aluminum magazines due to plasma electrolytic oxidation and a special functional coating, thereby enhancing electric insulation (nonconductive), improving corrosion resistance, preventing corrosion, The scratch can be prevented by the improvement.

Claims (5)

A method of manufacturing a magnesium material selected from a magazine, a kitchen appliance, an optical device part, a broadcasting device part, a battery part, a communication part, and an automobile part,
Anodizing the magnesium or magnesium alloy; And
A process for producing a magnesium material, which comprises coating a coating liquid containing polytetrafluoroethylene, sodium lauryl sulfate, silicone resin, octylphenoxypolyethoxyethanol, toluene, diethylene glycol monobutyl ether, water and xylene . The method according to claim 1,
Wherein the magnesium alloy comprises 2.7 to 2.8% by weight of aluminum, 0.93 to 1.05% by weight of zinc, 0.05 to 0.12% by weight of Mn, and the balance of magnesium. The method according to claim 1,
Wherein the anodic oxidation is performed by plasma electrolytic oxidation. The method according to claim 1,
Wherein the electrolytic solution of the anodic oxidation comprises 10 to 30 g / L of potassium hydroxide, 10 to 30 g / L of sodium hydroxide, 10 to 50 g / L of sodium silicate and 1 to 10 g / L of sodium phosphate. Gt; The method according to claim 1,
Characterized in that the corrosion resistance according to the 5% NaCl salt spray test of the magnesium material is 300 to 1000 hours, the surface resistance is 10 ⁸ to 10 ^8.5 Ω, and the hardness is Vickers hardness of 250 to 300 Hv. Way.

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