KR101466006B1 - Method for surface treatment of metal base - Google Patents

Abstract

The present invention relate to a method for treating the surface of a metal base material formed with metal such as magnesium, magnesium alloy, aluminum, aluminum alloy, titanium, titanium alloy, cooper, cooper alloy or the like which has the surface easy to be oxidized. The method includes the steps of: heating an alcohol-based or ketone-based passive solution filled in a pressure tank at the heat temperature of a passive treatment; and forming a passive layer with the reaction between the surface of the base material and the alcohol-based or ketone-based passive solution, heated at the heat temperature of the passive treatment, by pressurizing the metal base material at pressure which is two times of atmospheric pressure or lower for 1-15 minutes or 59 seconds or shorter after soaking the metal base material in the alcohol-based or the ketone-based passive solution.

Description

[0001] METHOD FOR SURFACE TREATMENT OF METAL BASE [0002]

More particularly, the present invention relates to a method for surface treatment of a substrate made of a metal used for various display electronic products, apparatuses, electronic equipment, etc. More specifically, A substrate made of a metal that is easily oxidized on the surface, such as copper, copper alloy, etc., is immersed in an alcohol-based or ketone-based passivation solution heated to passivation temperature and then pressurized in the atmosphere, Thereby forming a more dense passive layer.

Recently, magnesium or magnesium alloy has been widely used in various fields such as automobiles, cameras, mobile phones as well as automobiles including display electronic products because it is lightweight and excellent in electromagnetic wave shielding and heat dissipation.

However, in order to put such a magnesium alloy material into practical use, a surface treatment must be separately performed to secure durability for various internal parts and external parts.

As a general surface treatment of such a magnesium alloy material, a chemical treatment method of immersing a magnesium alloy in a chromate-chloride-containing treatment liquid containing hexavalent chromium has been widely used, but hexavalent chromium, which is a heavy metal, is not only fatal to the human body, There is a problem that it causes pollution problem, and therefore, there is a strict regulation on working environment and wastewater treatment.

As a non-chromate conversion treatment method for replacing the conventional chromate-chloride conversion treatment, there has been proposed a phosphate treatment method in which a metal such as zirconium, titanium, or zinc is added to magnesium phosphate. However, , There is a limitation in that it is not possible to impart insufficient practicality, sufficient corrosion resistance, rust resistance and film adhesion.

On the other hand, the 'processing solution for magnesium alloy, the surface treatment method, and the magnesium alloy substrate' (referred to as Document 1) disclosed in Korean Patent Publication No. 2002-0077150 (October 11, 2002) It is known.

In reference to the above-mentioned document 1, it has been found that a magnesium alloy containing a phosphoric acid ion and a permanganate ion as a means for imparting paint adhesion, corrosion resistance and rust preventive property to a magnesium alloy and having a pH of 1.5 to 7 Liquid and surface treatment methods.

However, in such a conventional method, since the chemical liquor must be in a pH range of 2.0 to 4.0, which is a strong acidic treatment condition, if the pH of the chemical liquor exceeds 7, for example, And the reproducibility reliability of the coating is deteriorated, so that sufficient corrosion resistance and film adhesion can not be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art by providing a substrate made of a metal, such as magnesium, (Ketone) -based passivation solution which is heated to a high temperature and then pressurizing the atmosphere to form a more dense passivation layer on the surface of the substrate.

The present invention also relates to a method of manufacturing a substrate made of a metal such as magnesium, a magnesium alloy, aluminum, an aluminum alloy, titanium, a titanium alloy, copper or copper alloy, And the passivation layer is formed on the surface of the substrate by pressurizing the atmosphere. Therefore, it is another object of the present invention to further shorten the processing time of the passive layer.

As a means for solving the problems of the present invention as described above, there is provided a step of heating an alcohol-based passivation solution to passive processing heat temperature.

Then, the metal substrate is immersed in the alcohol-based passivation solution, and then the atmosphere is pressurized at a pressure of 2 times or lower than the atmospheric pressure for 1 to 15 minutes or 59 seconds or less to form an alcohol-based passivation solution And a step of forming a passive layer by a reaction between the passivation layer and the substrate.

According to still another aspect of the present invention, there is provided a method of heating a ketone-based passivation solution to a passive heat treatment temperature.

Then, a metal substrate is immersed in the ketone-based passivation solution, and then the atmosphere is pressurized at a pressure of 2 times or lower than the atmospheric pressure for 1 to 15 minutes or 59 seconds or less to form a ketone-based passivation solution And a step of forming a passive layer by a reaction between the passivation layer and the substrate.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As described above, the present invention provides a method for manufacturing a substrate made of metal, which is easy to oxidize, such as magnesium, a magnesium alloy, aluminum, aluminum alloy, titanium, titanium alloy, copper alloy, Or a ketone based passivation solution and then pressurizing the atmosphere to form a more dense passivation layer on the surface of the substrate. Therefore, it is possible to provide the substrate with corrosion resistance, corrosion resistance, corrosion resistance, It provides an effect that further improves the metal quality sensibility.

The present invention also relates to a method of manufacturing a substrate made of a metal such as magnesium, a magnesium alloy, aluminum, an aluminum alloy, titanium, titanium alloy, copper, copper alloy or the like in an alcohol- ) Based passivation solution and pressurizing the atmosphere to form a passive layer on the surface of the substrate, thereby further reducing the processing time of the passive layer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a state in which a surface treatment is performed on a metal substrate according to the present invention. FIG.
2 is a flow chart of a first embodiment showing a surface treatment process for a metal substrate according to the present invention.
3 is a flow chart of a second embodiment showing a surface treatment process for a metal substrate according to the present invention.
4 is a flow chart of a third embodiment showing a surface treatment process for a metal substrate according to the present invention.
5 is a flowchart of a fourth embodiment of a surface treatment process for a metal substrate according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the preferred embodiments of the present invention, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of example at least one embodiment, And should not be construed as limiting the scope of the present invention.

It should be noted that the same reference numerals are used for the same components in the drawings of the present invention, and the same reference numerals are used for the same components. The present invention will be described in detail with reference to the drawings.

Metals such as aluminum, aluminum alloy, titanium, titanium alloy, copper and copper alloy (hereinafter referred to as "metal") as well as commonly used magnesium and magnesium alloys have excellent heat resistance In addition to the trend of thinning of materials in electronic products, apparatuses and electronic devices for various displays in addition to heat and heat diffusion, light weight (for example, magnesium, magnesium alloy, aluminum and aluminum alloy materials), vibration absorbing property and electromagnetic wave shielding property It is possible to substitute for a film, which is easy to cast and process, and is excellent in recyclability. On the other hand, due to high oxidation resistance and low corrosion resistance, it is essential to perform surface treatment as in the present invention.

The present invention is also referred to as a " base material "(hereinafter, referred to as" base material ") 100 made of die casting, injection molding or sheet material, ) Or a ketone-based passivation (hereinafter referred to as " passive ") preheated to a passivation heat temperature (T 1; unit ° C.) in a pressure tank 200 having an atmosphere pressurization (P1) at a predetermined pressure, for example, a pressure of not more than 2.0664 kgf / cm ^{2, which is} not more than twice the atmospheric pressure, by immersing the substrate 110 in a solution (hereinafter also referred to as " The passivation layer 120 (also referred to as "passivation layer") is formed on the surface of the metal substrate 100 so that the metal substrate 100 can be protected against corrosion, Metal) It improves the quality sensitivity and various interior parts and exterior And what that allows you to secure a durable goods such as its features.

In addition, the reliability test conditions of the above-mentioned metal-made substrate 100 according to the present invention include a constant temperature and humidity test conducted at a temperature of 60 DEG C and a humidity of 90% for 240 hours, Temperature thermal shock test for 100 cycles (cycle) up to 30 min. And a salt water test conducted for 5 min. To 120 h of salt water. This is important.

First, the constituent means for solving the problems according to the present invention and one embodiment of the present invention will be described with reference to the accompanying drawings.

The steps S201 and S301 of heating the alcohol-based passive solution 110 filled in the pressure vessel 200 to the passivation heat temperature T1 as shown in FIGS. 1, 2, and 3 Respectively.

The passivation solution 110 is formed on the surface of the passivation layer 120, that is, the surface of the substrate 100, by using a passive heat treatment temperature T1 to form ethanol, methanol, And is an alcohol-based material formed by mixing one or two or more selected from the group consisting of isopropyl alcohol, butyl alcohol, and octyl alcohol.

Subsequently, the metal substrate 100 is immersed in the pressure tank 200 filled with the alcohol-based passivation solution 110 (S202 and S302). Subsequently, at a pressure of 2.0664 kgf / cm ² or less, (P 1) to 15 minutes or 59 seconds or less and the surface of the substrate 100 is immersed in a passive state by reaction with the alcohol-based passivation solution 110 heated to the passivation heat temperature T 1 in advance ) Layer 120 (S203, S303).

FIG. 2 is a block diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention; FIG.

The steps S401 and S501 of heating the ketone-based passivation solution 110 filled in the pressure vessel 200 to the passivation heat temperature T1 as shown in FIGS. 1, 4, and 5 Respectively.

The ketone-based passivation solution 110 included in the passivation solution 110 is formed on the surface of the passive layer 120, that is, the surface of the substrate 100, (Ketone) -based material formed by mixing any one or two or more selected from the group consisting of acetone, methyl ethyl ketone, and methyl isobutyl ketone.

Then, the present invention is the ketone-based passivation solution 110 is filled with immersion in which the pressure metal base 100 to the tank 200, then (S402, S502), not more than twice the atmospheric pressure 2.0664kgf / cm ² pressure in one of the following The passive state (passivation state) is obtained by reacting the surface of the base material 100 with the ketone-based passive solution 110 heated to the passivation treatment temperature T1 in advance, ) Layer 120 (S403, S503).

Meanwhile, in the present invention, the base material 100 made of a metal material such as die casting, an injection molding, or a plate material may be made of magnesium alone or may be made of magnesium (Al), Cu, Ti, Ni And at least one selected from the group consisting of Si, Cr, Mn, Zn, Zr, Fe, Ca, Li and Be.

In addition, in the present invention, the base material 100 made of a metal material such as die casting, an injection material, or a plate material may be a single material of aluminum (Al), or may be a single material of Mg, Cu, Ti, Ni And an aluminum alloy selected from at least one of Si, Cr, Mn, Zn, Zr, Fe, Ca, Li and Be.

Further, in the present invention, the base material 100 made of a metal material such as die casting, an injection material, or a plate material may be a copper (Cu) single material, or may be a single material such as Mg, Al, Ti, Ni And a copper alloy selected from at least one of Si, Cr, Mn, Zn, Zr, Fe, Ca, Li, and Be.

In addition, in the present invention, the base material 100 made of a metal material such as die casting, an injection material, or a plate material may be made of titanium (Ti) alone or may be made of titanium, And a titanium alloy selected from at least one of Si, Cr, Mn, Zn, Zr, Fe, Ca, Li and Be.

The thickness t1 of the base material 100 made of the metal material is preferably 0.06 to 2 mm. However, it is preferable to use the base material 100 for the purposes or applications such as the chemical and physical properties of the base material 100, The thickness t1 may be included in a range of 0.02 to 4 mm to be thinner or thicker.

In the present invention, the above-mentioned passivation heat temperature (T 1) in the present invention is the boiling point (or boiling point) of the alcohol-based or ketone-based passive solution 110 filled in the pressure bath 200 Boiling point ") or a boiling point or lower in advance to be advantageous for the reaction action for forming the passive layer 120.

As another method of the present invention, the above-mentioned passivation heat temperature (T1) may be obtained by heating the alcohol-based or ketone-based passivation solution 110 filled in the pressure bath 200 to a temperature in the range of 40 to 200 ° C And is preheated so as to be advantageous to the formation of the passivation layer 120, that is, the reaction action as described above.

At this time, when the passivation heat temperature T1 is less than 40 deg. C, the reactivity of the passivation solution 110 falls and the passivation layer 120 may not be formed properly. On the other hand, ) Is more than 200 ° C, it is desirable to maintain a suitable passivation heat temperature (T 1) within the above-mentioned range of 40 to 200 ° C because the passive solution 110 is lost.

In other words, the boiling points of the reactants contained in the alcohol-based passivation solution 110 are 78.3 ° C for ethanol, 64.65 ° C for methanol, 82 ° C for butyl alcohol, 117.7 ° C for butyl alcohol and 194.5 ° C for octyl alcohol, The boiling point of the reactants contained in the ketone-based passivation solution 110 is 56.5 ° C for acetone, 79.6 ° C for methyl ethyl ketone, and 115.9 ° C for methyl isobutyl ketone. Therefore, either one of them may be used alone or two It is important to appropriately set the passivation treatment heat temperature T1 according to the kind of the alcohol-based or ketone-based passivation solution 110 used for mixing.

In addition, in the present invention, the substrate 100 is immersed in the passivation solution 110 heated to the passivation heat temperature T1, and then the atmosphere pressure P1 is applied to the pressure chamber 200 in order to passivate the surface. The reaction time may vary depending on the above-mentioned reactant, that is, the alcohol-based or ketone-based passivation solution 110, but the reaction can be carried out for less than 1 minute.

At this time, when the atmosphere pressurization (P1) time is less than 1 minute, the denseness of the passive layer 120 may decrease, but the reliability test condition of the substrate 100 mentioned above can be satisfied. On the other hand, when the atmosphere pressurization (P1) time exceeds 15 minutes, the passive layer 120 has a high density, but since the process time is unnecessarily long and can act as a waste factor, It is preferable to form the passive layer 120 in a precise manner.

In addition, the pressure required to give to the pressure tank 200, the pressure (P1) to the atmosphere, but characterized in that a two-fold or less 2.0664kgf / cm ² or less of the atmospheric pressure, contrast, 2.0664kgf / cm 2 or more times the atmospheric pressure, unlike ² It is preferable that the present invention is set to be not more than twice the above-mentioned atmospheric pressure, since it does not cause a large change in the formation of the passive layer 120 even if the atmosphere is pressurized (P1) by the above pressure.

The thickness of the passive layer 120 formed on the surface of the metal substrate 100 according to the present invention is determined by the passive processing heat temperature T1 as well as the passive solution 110, Time, pressure, and the like, but is preferably in the range of 0.1 to 2.0 mu m.

Meanwhile, the present invention provides a method of removing foreign substances from the surface of the base material 100 through a sufficient degreasing and washing process before immersing the base material 100 in the pressure tank 200 filled with the passive solution 110 Lt; / RTI >

In other words, when foreign substances are present on the surface of the substrate 100, the passivation solution 110 is not uniformly formed due to the surface tension, which may adversely affect formation of the passivation layer 120 .

In addition, the method further includes steps (S204, S304, S404, and S504) of taking the substrate 100 formed with the passive layer 120 from the pressure vessel 200 and naturally drying the substrate 100 at room temperature.

Alternatively, steps (S204, S304, and S404) of removing the substrate 100 formed with the passivation layer 120 from the pressure vessel 200 and drying the substrate 100 with infrared or hot air at an ambient temperature ranging from 20 to 60 ° C , S504).

The method further includes steps (S204, S304, S404, and S504) of removing the substrate 100 formed with the passive layer 120 from the pressure vessel 200 and drying the substrate 100 with ultrasonic waves.

The passivation layer 120 of the present invention formed as described above functions to further increase the adsorption force of the paint when the paint protection layer (not shown) based on the paint is separately formed thereon, Furthermore, a more dense and stable coating protection layer is formed on the surface of the base material 100 to further improve the metal sensitivity of the product including corrosion resistance and rust prevention property.

In addition, in the case of forming a film protective layer (not shown) based on a film separately on the passive layer 120 of the present invention, an adhesive means (not shown) Thereby further improving the weather resistance of the surface of the base material 100 and preventing corrosion.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should be defined by the claims of the present invention, rather than being limited to those described in various exemplary embodiments as mentioned above.

100: substrate
110: Passivation solution
120: passive layer
200: Pressure tank

Claims (18)

(S201) heating the alcohol-based passivation solution 110 to the passivation heat temperature T1;
After the metal substrate 100 is immersed in the alcohol-based passivation solution 110 (S202), the atmosphere is pressurized (P1) at a pressure of twice or less the atmospheric pressure for 1 to 15 minutes (P1) (S203) of forming a passivation layer (120) by reaction with an alcohol-based passivation solution (110) heated to a temperature (T1). (S301) heating the alcohol-based passivation solution 110 to the passivation heat temperature T1;
After the metal substrate 100 is immersed in the alcohol-based passivation solution 110 (S302), the atmosphere is pressurized (P1) at a pressure of not more than twice the atmospheric pressure and not more than 59 seconds, And a step (S303) of forming a passivation layer (120) by reaction with an alcohol-based passivation solution (110) heated to a temperature (T1). The method of claim 1 or 2, wherein the alcohol-based passivation solution (110) is at least one selected from the group consisting of ethanol, methanol, isopropyl alcohol, butyl alcohol, octyl alcohol, Wherein the metal surface is formed by mixing at least one selected from the group consisting of a metal and a metal. The method according to claim 1 or 2, wherein the passivation heat temperature (T1) is a temperature at which the alcohol-based passive solution (110) is heated to a boiling point or higher. The method according to claim 1 or 2, wherein the passivation heat temperature (T1) is obtained by heating the alcohol-based passive solution (110) to a boiling point or less. 3. The method according to claim 1 or 2, wherein the passivation heat temperature (T1) is obtained by heating the alcohol-based passive solution (110) to a temperature in the range of 40 to 200 占 폚. (S401) heating the ketone-based passivation solution 110 to the passivation heat temperature T1;
The metal substrate 100 is immersed in the ketone-based passivation solution 110 (S402) and the atmosphere is subjected to a pressurization (P1) at a pressure of 2 times or less the atmospheric pressure for 1 to 15 minutes (P1) And a step (S403) of forming a passivation layer (120) by reaction with the ketone-based passivation solution (110) heated to a temperature (T1). Heating the ketone-based passivation solution 110 to a passivation heat temperature T1 (S501);
After the metal substrate 100 is immersed in the ketone-based passivation solution 110 (S502), the atmosphere is pressurized (P1) at a pressure of not more than twice the atmospheric pressure and not more than 59 seconds, (S503) of forming a passivation layer (120) by reaction with a ketone-based passivation solution (110) heated to a temperature (T1). The method of claim 7 or 8, wherein the ketone-based passivation solution (110) is one or more selected from the group consisting of acetone, methyl ethyl ketone, and methyl isobutyl ketone And then mixing the resultant mixture. The method according to claim 7 or 8, wherein the passivation heat temperature (T1) is the ketone-based passive solution (110) heated to a boiling point or higher. The method according to claim 7 or 8, wherein the passivation heat temperature (T1) is obtained by heating the ketone-based passivation solution (110) to a boiling point or less. The method according to claim 7 or 8, wherein the passivation heat temperature (T1) is obtained by heating the ketone-based passivation solution (110) to a temperature in the range of 40 to 200 占 폚. The method according to any one of claims 1 to 7, wherein the thickness of the passivation layer (120) is 0.1 to 2.0 占 퐉. The substrate 100 according to any one of claims 1, 2, 7, and 8, wherein the base material 100 is made of magnesium (Mg) alone, or magnesium (Mg) And at least one selected from the group consisting of Cr, Mn, Zn, Zr, Fe, Ca, Li and Be. The substrate 100 according to any one of claims 1, 2, 7, and 8, wherein the substrate 100 is made of aluminum (Al) , Cr, Mn, Zn, Zr, Fe, Ca, Li, and Be. delete delete delete

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