KR101461070B1 - Method of surface treatment for metal goods - Google Patents

Abstract

A method for surface treatment of a metal product according to the present invention is a method for removing a surface of a metal product after removing the surface of the metal product and removing and neutralizing the material for removing the surface of the metal product, A method of treating a surface of a metal product, comprising the steps of spraying a surface treatment solution composed of ethanol (C ₂ H ₅ OH), acetone (CH ₃ COCH ₃ ) and water on the surface of a product of the washed metal; (C ₂ H ₅ OH), and the surface treatment solution comprises an aqueous solution of ethanol (C ₂ H ₅ OH) And acetone (CH ₃ COCH ₃ ) and water, the ethanol is mixed with 1 to 50 times the volume of water, and the acetone is mixed with 0.05 to 1 times the volume of ethanol. In the oxidation layer formation step Is characterized in that the metal product treated in the solution spraying step is placed in a flame kneader having an internal space of 200 to 260 DEG C and is subjected to flame treatment for 10 to 15 seconds to form an oxide film layer on the surface of the metal product, In the coating layer forming step, the metal product treated in the solution spraying step is placed in a heat treatment furnace having an internal space of 150 to 200 ° C and heat-treated for 5 to 20 minutes, Washing the metal product processed by the screen generating step, a film layer includes forming a dry later, during application or electrical coloring method, a coating method coating layer or deposited layer, the coating layer over the oxide coating layer formed on the surface of the metal product.
Therefore, the present invention is a method for removing metal impurities such as oil and the like on the surface of a metal product and then spraying a solution made of water, ethanol (C ₂ H ₅ OH), and acetone (CH ₃ COCH ₃ ) Since the oxide film layer is formed on the surface by the direct method or the heat treatment method, the time required for the surface treatment by the direct heating or the heat treatment can be shortened so that the oxide film layer can be formed rapidly on the surface of the metal product, It is possible to form an electrodeposited layer on the surface of an oxide layer formed on the surface of a metal product to realize a colored luster on the surface of a metal product, The surface gloss was maintained for a long time, and the oxide film layer formed on the surface of the metal product formed a fine pattern The durability of the final product formed with the coating layer or the coating layer on the oxide film layer can be easily improved.

Description

METHOD OF SURFACE TREATMENT FOR METAL GOODS [0002]

The present invention relates to a surface treatment method for a metal product, and more particularly, to a surface treatment method for a metal product that enables an oxide film layer or the like to be rapidly formed on the surface of a metal product.

In general, about 3/4 of the known chemical elements are metals. These metals are aluminum (Al), iron (Fe), copper (Cu) Since the number of electrons in the outermost shell of a metal atom is less than half of the maximum number of electrons, the metal atoms do not easily form a compound, but they usually have more than half of the maximum valence electron number The nonmetals, oxygen and sulfur, bind more easily.

Aluminum and aluminum alloys, titanium and titanium alloys, iron and ferroalloys, copper and copper alloys are widely used in automobile and aircraft parts, mobile phone cases, notebook computer cases, frames and kitchen appliances, And it is widely used as a product of various fields in accordance with the characteristics of the material such as the material.

In order to form an oxide film layer on the surface of the metal, an oxide film layer is conventionally formed on the surface of the metal by a surface treatment method such as anodizing, anodizing, plasma electrolytic oxidation and the like.

For example, in order to surface-treat a product made of a magnesium alloy, a surface of a magnesium alloy product is surface-treated by a surface treatment method such as anodizing, plasma electrolytic oxidation or the like to form a thin film layer of MgO or the like .

In other words, sodium hydroxide (NaOH) is mainly used as the electrolytic solution used in the surface treatment method, and the hydroxyl group (OH-) separated from the sodium hydroxide binds to the surface layer of the magnesium alloy product. And MgO and Mg (OH) ₂ thin film layers are formed on the surface layer of the magnesium alloy product.

However, the conventional art has a disadvantage in that it takes a long time to form an oxide layer on the surface layer of the product, so that the surface of the product can not be treated more quickly.

Further, in the related art, there is a technique of forming a coating layer by coating a surface of a metal product or forming a metal coating layer by a sputtering method. However, if a coating layer or a metal coating layer is formed without treating the surface of a metal product, Or the adhesion between the metal surface and the metal coating layer is low, so that the coating layer and the metal coating layer easily peel off.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a method and apparatus for forming an oxide film layer by spraying a surface treatment solution on a surface of a metal product, And a method for surface treatment of a metal product.

Further, the present invention is to provide a surface treatment method of a metal product which can firmly form a coating layer, a metal coating layer and an electrodeposited layer on an oxide film layer formed rapidly.

In order to accomplish the above object, the present invention provides a method of removing a surface of a metal product, removing the surface of the surface of the metal product, removing and neutralizing the surface of the metal product, (C ₂ H ₅ OH), acetone (CH ₃ COCH ₃ ), and water on the surface of a product of the washed metal; And forming an oxide layer on the surface of the metal product by burning or half-burning the metal product treated in the solution spraying step.

Also, the surface treatment solution is prepared by mixing ethanol (C ₂ H ₅ OH), acetone (CH ₃ COCH ₃ ) and water, mixing the ethanol with 1 to 50 times the volume of water, adding the acetone to 0.05 ~ 1 fold of the solution.

Further, in the step of forming the oxide layer, the metal product treated in the solution spraying step is placed in a flame cooker having an internal space of 200 to 260 ° C, followed by flame treatment for 10 to 15 seconds to form an oxide film layer on the surface of the metal article And the metal oxide layer treated in the solution spraying step is placed in a heat treatment furnace having an internal space of 150 to 200 ° C for heat treatment for 5 to 20 minutes.

Also, the metal product treated in the step of forming an oxide layer may be washed and dried, and then a coating layer, an electrodeposition layer, or a coating layer may be formed on the oxide layer formed on the surface of the metal product by a painting process, an electrochromic process, or a coating process.

The surface treatment method of a metal product according to the present invention as described above is a method of treating a surface of a metal product by removing foreign substances such as oil and the like on the surface of the metal product and washing the surface of the metal product with water and a solution of ethanol (C ₂ H ₅ OH), acetone (CH ₃ COCH ₃ ) The solution is sprayed on the surface of the metal product to form an oxide film layer on the surface by a direct heating method or a heat treatment method so that the time required for the surface treatment by the direct heating or heat treatment can be shortened so that the oxide film layer can be rapidly There is an advantage that it can be formed.

In addition, an electrodeposited layer can be formed on the surface of an oxide layer formed on the surface of a metal product to achieve a colored luster on the surface of a metal product. In addition, The surface gloss of the electrodeposited layer formed on the substrate was maintained for a long time.

Since the oxide film layer formed on the surface of the metal product forms a fine pattern, the durability of the final product formed with the coating layer or the coating layer on the oxide film layer can be easily improved.

Hereinafter, preferred embodiments of a method for surface treatment of a metal product according to the present invention will be described in more detail.

The present invention relates to a method for treating a surface of a metal product, comprising the step of spraying oil or droplets on the surface of the product before the surface treatment with a flame retarder or a heat treatment machine having an internal space for maintaining a constant temperature after spraying the surface treatment solution onto a metal surface .

That is, in the present invention, as in the conventional method, the surface of the metal product is removed, the material for removing the surface of the metal product is removed and neutralized, and the washed metal product is surface-treated.

For example, pretreatment of metal products with degreasing step, trichlorethylene removal step, acetone neutralization step, and washing step is performed to remove oil or herd on the surface of the product.

In the degreasing step, which removes the surface of the product, the product is treated with a solution of trichlorethylene (C ₂ HCl ₃ , trichlorethylene (TCE)).

As a reference, trichlorethylene (C ₂ HCl ₃ , trichlorethylene (TCE)) is a colorless transparent liquid that gives off a sweet smell. It is used for cleaning and dyeing in the textile industry, drying An organic solvent used as a solvent, a diluent for a lacquer, a cleansing agent for glass or an optical instrument, and a fat removing agent for leather.

These trichlorethylene are used to remove oil from the surface of metal products such as automobile and aircraft parts, mobile phone cases, notebook computer cases, eyeglass frames, and kitchen appliances.

In the degreasing step, the trichlorethylene removed on the surface of the degreased product such as oil is removed. In the trichlorethylene removal step, the degreased product is treated with an acetone solution to remove the trichlorethylene solution on the surface. To remove it.

In order to clean the acetone-treated product with water, it is necessary to neutralize acetone adhered to the product. In the acetone neutralization step, the acetone treated in the step of removing the chlorochloroethylene is treated with a methanol solution to neutralize the acetone on the product surface .

Methanol (CH ₃ OH) is the simplest alcohol, also known as methyl alcohol, and is also called wood spirit because it is obtained from wood vinegar obtained by the dry distillation of wood. It is a methyl ester type of various carboxylic acids such as salicylic acid, Various types of methyl ether are contained in various natural products.

Methanol is a colorless, transparent, volatile liquid with a unique orientation and is well mixed with solvents such as water, ethanol, benzene, ether and the like. It is mixed with gasoline and used as cold fuel for automobiles. It is mixed with ethanol, .

After the acetone adhered to the surface of the product is neutralized with methanol, it is necessary to clean the product. In the washing step, the product treated in the acetone neutralization step is washed with water and then the water is removed.

In the present invention, a solution spraying step for spraying the surface treatment solution onto the surface of the product is performed in order to smoothly treat the surface of the product before the product washed in the cleaning step is put into the fire extinguisher or the heat treatment apparatus.

The surface treatment solution used in the solution injecting step is a simple substance in which water, ethanol (C ₂ H ₅ OH), and acetone (CH ₃ COCH ₃ ) are mixed. This is because the ethanol is mixed with water at 1 to 50 times And the acetone is mixed with 0.05 to 1 times the volume of ethanol.

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Here, the ethanol not only affects flame stability and stain removal but also lowers the surface tension of water. When ethanol is mixed with less than 1 volume of water, it is formed in the oxide film due to lack of hydroxyl group (OH-) There is a shortage of a current field, so that an oxide film layer is not formed smoothly on the surface layer of the metal product, and the surface treatment solution sprayed on the product surface due to the surface tension of the water is not uniformly distributed on the surface of the product, .

When the ethanol is mixed more than 50 times the volume of water, the oxide film layer is easily formed due to water, but not only the number of unnecessary hydroxyl groups (OH-) is large, but also the stability of the boiling point of water and ethanol may be lowered to form a uniform oxide film layer Adverse effects.

For reference, ethanol (C ₂ H ₅ OH) or ethyl alcohol is a colorless flammable compound, a kind of alcohol, present as a colorless liquid at normal temperature, transparent and pale blue It has a characteristic odor and taste, hydrogen bonding, melting point of -114.5 ° C and boiling point of 78.32 ° C. It can be dissolved in water, other alcohol, ether, ketone, chloroform, etc., The steam is explosive and can be used as fuel in some internal combustion engines and is often used as a solvent, disinfectant, fuel and so on.

On the other hand, the above acetone affects the flame temperature and persistence, uniformity of the ethanolic power and shortening of the surface treatment time. When the acetone is mixed with less than 0.05 times the ethanol volume, the ethanolic power can not be uniformized, If the amount of acetone is more than 1 times the volume of ethanol, the unnecessary amount of acetone may adversely affect the shortening of the surface treatment time, and the uniformity of the surface may be lowered due to the bubbles.

For reference, acetone (CH ₃ COCH ₃ ) is mixed with most solvents such as water, alcohol, ether, etc., and is highly volatile at room temperature, so it is highly flammable. It is converted to isopropyl alcohol by most reducing agents, Methyl ethyleneglycol is produced, acetic acid and carbon dioxide are produced by reaction with sodium chromate and sulfuric acid, and react with ammonia to produce acetone amine such as diacetone amine.

Acetone is one of the solvents widely used for the production of plastics and cellulose coatings. It is also used for dissolving acetylene and storing it. It is also used as a raw material for organic synthesis. Typical compounds produced from acetone include di Acetone alcohol. In real life, it is well soluble in both water and organic solvents, washing substances that do not wash with water, such as paint.

Meanwhile, the product treated in the solution injection step forms an oxide coating layer on the surface of the product by an oxide layer formation step. In the oxide layer formation step, the metal product treated in the solution injection step is burned or half- To form an oxide film layer on the surface of the substrate.

For example, in the step of forming an oxide layer, the flame-retardant is added to a flame-retarder having an internal space of 200 to 260 ° C. and then subjected to flame treatment for 10 to 15 seconds. When the temperature is lower than 200 ° C., An oxide layer is not readily formed on the surface of the substrate, and when the temperature is higher than 260 ° C, the surface state of the product is not uniform.

Of course, since the heat source directly reaches the product, if the flame time is shorter than 10 seconds, the oxide film is not easily generated, and if it is longer than 15 seconds, the surface quality of the product can be lowered.

As another example, in the present invention, the surface treatment solution adhered to the surface of the product can be semi-burned by the heat treatment method instead of the above-mentioned flame treatment method, If the temperature is lower than 150 ° C., the semi-burning state can not be maintained, and the surface treatment time is delayed, and an oxide layer is not easily formed on the surface of the product , It is not necessary to waste unnecessary temperature and time since the flame treatment step is more efficient in that the temperature is higher than 200 ° C.

Although the above-mentioned heat treatment method requires a longer processing time than the direct-finishing treatment method, the surface treatment solution on the surface of the product can be removed more smoothly than the direct-finishing treatment method, and the heat- Therefore, if the heat treatment time is shorter than 5 minutes, the oxide film is not easily generated and the surface treatment solution can be completely removed within 20 minutes, so that it is not necessary to heat treatment longer than 20 minutes.

In the present invention, the material of the metal product is magnesium alloy, aluminum and aluminum alloy, titanium and titanium alloy, iron and ferroalloy, copper and copper alloy, and if it is a magnesium alloy, an oxide coating layer of MgO and Mg (OH) ₂ is formed An oxide film layer of Al ₂ O ₃ is formed of aluminum and aluminum alloy, an oxide film layer of TiO ₂ is formed of titanium and titanium alloy, an oxide film layer of Fe ₃ O ₄ is formed of iron and ferroalloy, An oxide film layer of Cu ₂ O is formed.

In addition, an electrodeposition layer can be formed on the anodized layer by the washing and drying step and the electrodecoloring step after forming the anodized layer on the surface of the product as described above. In the washing and drying step, the metal product And then dried. After the metal product is washed and dried, an electrodeposition layer is formed on the anodized layer by an electrochromic process.

Of course, it is preferable to wash using ethanol in the washing and drying step, and it is preferable to dry the ethanol sufficiently after washing.

In any case, the electrochromic step forms an electrodeposited layer by a conventionally known electrochromic method, and forms an electrodeposited layer on an anodized layer formed on the surface of the metal product processed in the washing and drying step, The description thereof is omitted.

In the present invention, the thickness of the electrodeposition layer in the electrochromic step is preferably 10 to 24 占 퐉, and the thickness is an optimum thickness in consideration of surface gloss, durability and processing cost, an oxide layer is formed on the surface of the metal product, The electrodeposition layer is more uniformly formed on the oxide film layer, and the surface of the product can be glossy due to the electrodeposition layer.

Particularly, the samples formed with an oxide layer and an electrodeposited layer formed on the surface of the product were tested for 500 hours at a time interval of 24 hours by the hair-line surface treatment salt water spray limit test method. As a result, the surface gloss of the electrodeposited layer formed on the surface of the metal product And a good state was maintained.

On the other hand, the product treated in the solution spraying step is formed into an oxide layer by an oxide layer formation step, followed by a washing and drying step and a coating step in order to form a coating layer on the oxide layer.

After the anodizing layer is formed on the surface of the product as described above, the metal product treated by the anodizing layer fish step is dried and dried in the washing and drying step. After the metal product is washed and dried in the washing and drying step, The coating layer is formed on the oxide coating layer formed on the surface of the metal product.

For example, the painting operation includes a baking process, a Teflon process, a ceramic coating process, a powder coating process and the like. The coating process for forming the coating layer on the anodic oxide coating layer by such a coating process forms a coating layer by a coating process such as a powder coating A method such as a powder coating or the like is well known in the prior art and its explanation is omitted.

Of course, in the coating step, the coating layer is formed on the oxide coating layer in the same manner as the powder coating method using a coating material such as a bain-based coating material, an epoxy resin coating, an enamel coating material,

In particular, it is preferable that the thickness of the coating layer is formed to an optimum thickness considering the surface gloss, durability, and processing cost, and it is necessary to subdivide the coating process in consideration of gloss and durability of the coating layer.

That is, the metal product that has been cleaned and dried in the washing and drying step is placed on a conveyor, and the surface of the product is pretreated by a static elimination gun or a static elimination nozzle. After that, And the surface of the coating layer formed on the surface of the product is completely dried. The surface of the coating layer formed on the surface of the product is completely dried.

Therefore, the coating material constituting the coating layer is firmly adhered due to the oxide film layer having a fine pattern formed on the surface of the metal product, so that the durability of the coating layer is increased, and the durability of the coating layer is increased due to the fine pattern of the oxide film layer It can be.

On the other hand, after the product is washed and dried in the washing / drying step, a coating layer of a metal material is formed on the oxidation coating layer by a dry coating method.

That is, the dry coating method includes an electron beam deposition method, an ion plating method, a sputtering method, and a plasma enhanced chemical vapor deposition (PECVD) method. The dry coating method of forming a coating layer of a metal material on the oxide coating layer by the dry coating method (Al) and tin (Sn), titanium (Ti), copper (Cu), gold (Au), silver (Ag), nickel (Ni), and the like are formed by a dry coating method such as a conventionally known sputtering method. (Ni), stainless steel (SUS), or silicon (Si) is formed as a coating layer by a dry coating method, and a dry coating method such as a sputtering method is well known in the prior art.

Of course, in the dry coating step, the aluminum (Al) and the tin (Sn), titanium (Ti), copper (Cu), gold (Au), silver (Ag), nickel (Ni), stainless steel ) May be selected to form a metal coating layer in the form of a multilayer on the oxide coating layer in turn by a dry coating method, or various patterns can be formed by metal of a different material. The thickness of the metal coating layer may be a surface gloss, durability, It is preferable that the thickness is set to an optimum thickness.

Thus, the present invention can rapidly form an oxide layer having a fine pattern, and the durability of the coating layer can be increased due to the fine pattern of the oxide layer. Also, since the coating layer of the product, Can be implemented smoothly.

Claims (7)

A method of surface treatment of a metal product comprising removing a surface of the surface of the metal product after removing the surface of the surface of the metal product and removing and neutralizing the surface of the surface of the metal product,
A solution spraying step of spraying a surface treatment solution composed of ethanol (C ₂ H ₅ OH), acetone (CH ₃ COCH ₃ ) and water on the surface of the product of the washed metal;
Forming an oxide film layer on the surface of the metal product by burning or half-burning the metal product processed in the solution injecting step;
And a surface treatment method of the metal product. The method according to claim 1,
The surface treating solution in the solution injecting step is prepared by mixing ethanol (C ₂ H ₅ OH), acetone (CH ₃ COCH ₃ ) and water, mixing the ethanol with water at a volume of 1 to 50 times, Wherein the solution is a solution prepared by mixing 0.05 to 1 times the volume of the surface of the metal product. The method according to claim 1,
In the step of forming the oxide layer, the metal product treated in the solution spraying step is placed in a fire extinguisher having an internal space of 200 to 260 ° C., and is subjected to a flame treatment for 10 to 15 seconds to form an oxide film layer on the surface of the metal product Of the surface of a metal product. The method according to claim 1,
Wherein the step of forming the oxide layer is performed by heat treating the metal product treated in the solution spraying step for 5 to 20 minutes by inserting the metal product into a heat treatment apparatus having an internal space of 150 to 200 캜. The method according to claim 1,
A washing and drying step of washing the metal product treated in the oxidation layer formation step with ethanol and drying the metal product;
And an electrodeposition step of forming an electrodeposition layer on the anodized layer formed on the surface of the metal product treated in the washing and drying step. The method according to claim 1,
A washing and drying step of washing the metal product treated in the oxidation layer formation step and drying the metal product;
And a coating step of forming a coating layer on the oxide coating layer formed on the surface of the metal product processed in the washing and drying step by coating operation. The method according to claim 1,
A washing and drying step of washing the metal product treated in the oxidation layer formation step and drying the metal product;
And a dry coating step of forming a coating layer on the oxide coating layer formed on the surface of the metal product treated in the washing and drying step by a dry coating method.