KR20130005013A - Zig for anodizing of mg or mg alloy article - Google Patents

Abstract

The present invention relates to a jig for anodizing process, and more particularly, to a jig for performing anodizing process of a magnesium or magnesium alloy product, a jig portion in which a conductive line connected to an electrical application device is disposed, and coupled to the jig portion. It is composed of a tip portion for holding and contacting the product for anodizing, relates to a jig for anodizing process that the tip portion is made of magnesium or magnesium alloy material.

Description

Zig for Anodizing of Mg or Mg Alloy Article

The present invention relates to a jig for performing an anodizing process that securely fixes a product in an anodizing process of a magnesium or magnesium alloy product and prevents product damage due to overcurrent and current loss, thereby enabling stable current supply to the product and continuous use of the jig. will be.

The anodizing process is one of the surface post-treatment methods of aluminum, also called the fishery method, the direct current sulfuric acid method, and the anodization method. The anodizing step is a step of forming a porous aluminum oxide film on the surface of an aluminum product by oxygen generated from the anode by energizing the aluminum product to be plated as an anode.

The corrosion resistance and abrasion resistance of the aluminum product is increased by the aluminum oxide film formed on the surface, thereby preventing oxidative corrosion, thereby extending the life of the aluminum product and various devices manufactured using the same.

The anodizing process is applied to electronic and automatic control devices such as rollers and drums, weaving machines, knitting machines, sewing machines, cylinders, automobile parts, optical devices, conveyors, sports and leisure goods, tableware, kitchen equipment, mass production shafts, and various molds. I use it variously.

As already mentioned, anodizing is mainly applied to aluminum, and recently, it is also applied to other metals such as titanium and magnesium, which have similar characteristics to aluminum.

Among them, magnesium alloy is hard and light, excellent in dimensional stability, fine strength and vibration damping are superior to aluminum alloy and steel, and complex parts can be produced precisely by die casting. In addition, it is easier to cast or die cast than aluminum, and has excellent EMR Shield effect as well as durability and heat resistance.

Magnesium alloys are increasingly being used for lighter weight programs in the automotive industry and for EMR shields in the electronics industry. As a surface treatment process of a magnesium alloy, various methods such as mechanical pretreatment, pickling, plating, and painting are used, and recently, a process of treating a surface by applying an anodizing process has been in the spotlight.

The anodizing process of the magnesium alloy product has the advantage of improving the corrosion resistance as well as the adhesion to the coating like aluminum.

Currently anodizing process treatment of magnesium alloy products is performed the same or similar to anodizing process of aluminum products. In other words, the product to be processed in the anodizing process is fixed in the electrolytic cell through a jig, and the jig is connected to the positive electrode of the power supply and the negative electrode plate is disposed in the electrolytic cell, followed by applying a current.

The jig of the conventional anodizing process uses aluminum, titanium or stainless steel. For example, Korean Patent Registration No. 20-0423661 discloses that a jig can be manufactured from a metal material such as aluminum alloy and stainless steel and a plastic resin such as polyethylene.

In the case of magnesium alloy products, however, aluminum cannot be used because the electrolyte is strongly alkaline. In addition, titanium is unsuitable for anodizing magnesium alloy because of the large amount of leakage current.

This is to use magnesium or magnesium alloy as a jig material, but such a magnesium-based material has a problem that the elasticity is significantly lower than that of aluminum does not support the product safely during the anodizing process.

Attempts have been made to change the material of the jig or to vary the structure.

Korean Utility Model Registration No. 20-0446758 proposes anodizing jig of magnesium alloy product, in which V-shaped or U-shaped current-carrying wire with connecting ring part connected to the frame is covered with an insulator. The conductive lines of the remaining portions, except for the two contact portions formed on both sides of the connection portion and the connecting ring portion formed on the upper end thereof, are covered with an insulator, and elastic means for separating the two contact portions formed on the conductive lines with elastic force on both sides of the conductive lines. It proposes a structure in which a sheathed insulator is wrapped and connected.

In addition, the Republic of Korea Utility Model No. 2009-0005805 is formed in the X shape as a whole, the two tabs are firmly fixed to the product by the elastic force of the elastic member, so that the adhesive force of the contact portion of the jig increases, the electricity flows smoothly It is disclosed that the quality of the surface treatment of a product can be easily improved.

Korean Utility Model Registration No. 20-0446758; Republic of Korea Utility Model No. 2009-0005805

Accordingly, the present inventors have made various efforts to develop a jig for safely performing the anodizing by safely fixing the product when performing an anodizing process of a magnesium or magnesium alloy product, and manufacturing a jig by changing the material as well as the structure of the jig. As a result of performing anodizing using a jig, an oxide film was uniformly formed on the surface to confirm physical properties such as corrosion resistance, thereby completing the present invention.

It is therefore an object of the present invention to provide a jig that can be used in the anodizing process of magnesium and magnesium alloy products.

In order to achieve the above object,

Jig for performing anodizing process of magnesium or magnesium alloy product,

A jig portion in which a conductive line connected to the electric applying device is disposed;

It is composed of a tip portion coupled to the jig portion for holding the product for anodizing contact,

It provides a jig for anodizing process wherein the tip is made of magnesium or magnesium alloy material.

The jig according to the present invention is composed of a tip material with excellent elasticity to secure the product in the anodizing process of magnesium or magnesium alloy products and to prevent product damage due to overcurrent to enable continuous use.

In addition, the magnesium or magnesium alloy product obtained by using this has an excellent corrosion resistance and surface properties has the effect of improving the life of the product.

1 is a schematic diagram showing an anodization process using a jig.
FIG. 2 is an enlarged view of region A of FIG. 1.
(A) is a cross-sectional scanning electron micrograph of the anodized Mg substrate obtained in Example 1, and (b) is a surface scanning electron micrograph.

Hereinafter, the present invention will be described in more detail.

The jig according to the invention is applied to the anodizing process of a product made of magnesium or magnesium alloy.

1 is a schematic diagram showing an anodizing process using a jig.

Referring to FIG. 1, the anodizing process includes a specimen 10 for performing anodizing, a jig 12 for fixing the specimen 10, an electrolytic cell 16 in which an electrolyte 14 is contained, and the specimen 10. A power supply device 18 for applying a voltage is provided.

At this time, the cathode 18a connected to the power applying device 18 uses the jig 12 as the anode, and the energization part 20 is provided so that electricity in the jig 12 can flow.

Both sides of the specimen 10 are fixed to the jig 12 for anodizing and disposed to be immersed in the electrolyte 14, and then an anodizing process is performed by applying electricity from the power applying device 18.

The jig 12 includes a jig part 12a in which a conductive line connected to a power applying device is disposed, and a tip part 12b coupled to the jig part 12a. At this time, the tip portion 12b is coupled to the jig portion 12a so as to contact and securely fix the product for anodizing.

In particular, the jig 12 according to the present invention differs from each other in the materials of the jig part 12a and the tip part 12b. The jig part 12a uses an elastic metal, and the tip part 12b is magnesium or magnesium. Alloy is used.

The material of the jig part 12a may be any metal having elasticity, and a material known in the art may be used. Typically, the material of the jig portion is selected from the group consisting of iron, stainless steel, nickel, nickel alloys, titanium, aluminum, copper and combinations thereof, and preferably aluminum, copper or these alloys.

The tip portion 12b uses magnesium or a magnesium alloy, and more preferably, satisfies the following physical properties.

Specific gravity (g / cm 3): 1.35 to 1.86

Max Tensile Strength (MPa): 200 ~ 300Mpa

Linear expansion coefficient (10 ^-6 / K): 14-37

At this time, the shape of the jig 12 can be any known jig shape, it is not particularly limited in the present invention.

Representatively, the jig part 12a may be manufactured in a rod shape, a cylindrical shape, or a flat plate shape, and the tip part 12b may be manufactured in various shapes such as an L shape, a C shape, a V shape, a square shape, a W shape, a triangular shape, or an O shape. . Preferably, as shown in FIG. 1, a jig 12 having a structure in which an L-shaped tip portion 12b is coupled to a rod-shaped jig portion 12a may be used.

Tip portion 12b may be coupled to any position of the jig portion 12a, for example, may be preferably located at the bottom of the jig portion 12a.

The jig unit 12a and the tip unit 12b may be combined in various ways.

FIG. 2 is an enlarged view of region A of FIG. 1.

As shown in (a) of FIG. 2, the jig part 12a and the tip part 12b may be joined by welding while the interfaces are in contact with each other, and as shown in (b), a separate connection member, for example, a bolt / nut, It can be combined by riveting and tapping. In this case, when the connecting member is used, only the tip portion 12b can be selectively replaced.

In particular, in order to effectively apply current to the specimen 10 through the tip portion 12b, the conducting wire 20 and the tip portion 12b in the jig portion 12a must be electrically connected as shown in FIG.

In addition, the jig 12 according to the present invention coats the coating film on the surface of the jig part 12a except for the tip part 12b to prevent oxidation or corrosion of the jig 12 by the electrolyte during the anodizing process.

The coating film may be a polymer, silicone, EPDM (Ethylene Propylene Terpolymers), ethylene-propylene rubber (EPR; Ethylene-Propylene Rubber), Chloroprene Rubber (CR), Nitrile Butadiene Rubber (NBR; Nitrile Butadiene Rubber) Butadiene Rubber (BR; Polybutadiene Rubber), Fluoro Elastomers, Polytetrafluoroethylene, Polyethylacrylate, Ethylene Tetrafluoroethylene, Fluorinated Ethylene-propylene Copolymer, High Density Polyethylene, Polypropylene, Polyethylene, Enamel , Lease, acrylic, urethane, epoxy, lacquer and the like can be used. A coating including such a composition is prepared to have an appropriate concentration, and then coated and dried to a bonding region through welding and other bonding methods through a known coating method to form a coating film. The coating may be a wet method such as dipping, powdering, doctor blading, rolling, spraying, etc. as well as a dry method such as laminating coating.

 Etc., and apply | coated to a uniform thickness.

At this time, the coating film formed on the surface of the jig portion 12a is formed to a thickness of 0.1 to 100㎛, so as to effectively protect the jig portion 12a from the electrolyte without economic loss.

As described above, the jig according to the present invention effectively performs the anodizing process of the magnesium or magnesium alloy product by configuring the tip portion and the jig portion in contact with the product for performing the anodizing is made of a material having different elastic properties.

The anodizing process of the magnesium or magnesium alloy product is not particularly limited in the present invention and follows the known method.

As electrolyte, KF (1-10%), NaOH (1-50%), KOH (1-50%), Na ₂ SiO ₃ (1-20%), Al (OH) ₃ (1-20%) It is used in the chemical formulation, and preferably an aqueous solution containing 5-10% NaOH, 5% KOH and 3% Al (OH) ₃ is used.

At this time, the current density is performed by applying 0.5 to 4 A / dm 2, and the temperature is performed at 15 to 30 ° C., preferably at 25 ° C. for 0.5 to 2 hours, preferably for 0.5 to 1 hour.

The conditions of the anodizing process can be sufficiently changed by those skilled in the art within the above range in consideration of various factors such as the diameter and the degree of alignment of the fine pores, the thickness of the anodized film and the like.

A magnesium or magnesium alloy oxide film is formed on the surface of the product formed by the anodizing process, and the oxide film is formed to a thickness of 5 to 30 µm, preferably 10 to 25 µm, more preferably 20 µm. The oxide film can be securely fixed by the use of the jig according to the present invention to improve physical properties such as corrosion resistance of the product, and consequently extends the life of the product.

Magnesium or magnesium alloys will be expanded in the future due to the light weight program of the automotive industry, the light weight of the electronics industry and the telecommunications industry, and the prevention of electromagnetic waves, and this surface treatment will be the best choice among the environmentally friendly technologies pursued by mankind. Can be.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

Hereinafter, the present invention will be described in more detail with reference to Examples. The following examples are only examples for explaining the present invention, but the present invention is not limited thereto.

[Example]

Example 1

A bar-shaped jig part (10 × 20 × 5mm) made of copper and a 'L' shaped tip part made of magnesium were prepared. The tip was welded to the bottom of the jig to prepare a jig.

Both sides of the magnesium substrate for anodizing were fixed using the prepared jig. This magnesium substrate was immersed in an electrolytic cell with an aqueous electrolyte solution in which 5% by weight sulfuric acid and 10% by weight of oxalic acid were mixed. A current of 2 A / cm 2 was supplied thereto at 25 ° C. for 30 minutes to form a magnesium oxide film on the surface of the magnesium substrate.

Example 2

Anodizing was performed in the same manner as in Example 1, except that a high density polyethylene coating film was formed on the surface of the jig to have a thickness of 100 μm. At this time, the coating film was prepared by a dipping coating method using a coating solution in which high density polyethylene was dissolved in xylene.

Example 3

Anodizing was performed in the same manner as in Example 1, except that the jig and the tip were fixed by using bolts.

Comparative Example 1

Anodizing was performed in the same manner as in Example 1, except that the jig and the tip were made of aluminum.

Experimental Example 1

In order to confirm the surface state of the magnesium substrate prepared in Example 1, the cross section and the surface were measured using a scanning electron microscope, and the obtained results are shown in FIG.

3A is a cross-sectional scanning electron micrograph of the magnesium substrate obtained in Example 1, and (b) is a surface scanning electron micrograph. Referring to (a) and (b) of FIG. 3, it was confirmed that a magnesium oxide film was uniformly formed to a thickness of 15 μm on the surface of the magnesium substrate.

Experimental Example 2

The physical properties of the magnesium substrate subjected to the anodizing process through the above Examples and Comparative Examples were measured, and the results are shown in Table 1 below. At this time, as a control example, an untreated anodized magnesium substrate was used.

(1) corrosion resistance; Corrosion occurred after dipping in HCl 10% solution (25 ℃).

(2) Wear resistance: The number of times that the magnesium oxide film withstands repeated friction cycles.

Corrosion resistance Cycle Example 1 Not occurring 3500 Example 2 Not occurring 4200 Example 3 Not occurring 3400 Comparative Example 1 Slightly 2900 Control Example Occur 2100

Referring to Table 1, as a result of performing the anodizing process using a jig manufactured according to the present invention, it can be seen that the physical properties of the anodized substrate is more excellent.

The jig according to the present invention is applicable to an anodizing process or a plasma coating process of magnesium or magnesium alloy products.

10: Psalm 12: jig
12a: jig part 12b: tip part
14: Electrolyte 16: Electrolyzer
18: power supply device 18a: cathode
20: power line

Claims (11)

Jig for performing anodizing process of magnesium or magnesium alloy product,
A jig portion in which a conductive line connected to the electric applying device is disposed;
It is composed of a tip portion coupled to the jig portion for holding the product for anodizing contact,
Jig for anodizing process wherein the tip portion is made of magnesium or magnesium alloy material. The jig for anodizing process according to claim 1, wherein the jig part material comprises one selected from the group consisting of iron, stainless steel, nickel and nickel alloys, titanium, aluminum, copper, and combinations thereof. The jig for anodizing process according to claim 1, wherein the jig part material comprises one selected from the group consisting of aluminum, copper or alloys thereof. According to claim 1, wherein the jig portion is silicon, EPDM (Ethylene Propylene Terpolymers), ethylene-propylene rubber (EPR; Ethylene-Propylene Rubber), Chloroprene Rubber (CR), Nitrile-butadiene rubber (NBR; Nitrile) Butadiene Rubber), Butadiene Rubber (BR; Polybutadiene Rubber), Fluoro Elastomers, Polytetrafluoroethylene, Polyethylacrylate, Ethylene Tetrafluoroethylene, Fluorinated Ethylene-propylene Copolymer, High Density Polyethylene, Polypropylene, Jig for anodizing process is formed a coating film comprising one material selected from the group consisting of polyethylene, enamel, lease, acrylic, urethane, epoxy, lacquer and combinations thereof. The jig for anodizing process according to claim 4, wherein the coating film has a thickness of 0.1 to 500 µm. The jig for anodizing process according to claim 1, wherein the tip magnesium or magnesium alloy material satisfies the following conditions:
Specific gravity (g / cm 3): 1.35 to 1.86
Max Tensile Strength (MPa): 200 ~ 300Mpa
Linear expansion coefficient (10 ^-6 / K): 14-37 The jig for anodizing process according to claim 1, wherein the jig portion has a rod shape, a cylindrical shape, or a flat plate shape. The jig for anodizing process according to claim 1, wherein the tip portion has an L-shape, a U-shape, a V-shape, or an O-shape, a square, a tri-shape, or a W-shape. The jig for anodizing process according to claim 1, wherein the jig part and the tip part are joined by welding. The jig for anodizing process according to claim 1, wherein the jig portion and the tip portion are coupled through a connecting member in a manner including bolt / nut, riveting, or tab fastening. The jig for anodizing process according to claim 1, wherein the tip unit is coupled to be electrically connected to a conductive line of the jig unit.

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