KR20130083108A - The coating method for magnesium containing product - Google Patents

The coating method for magnesium containing product Download PDF

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Publication number
KR20130083108A
KR20130083108A KR1020120003657A KR20120003657A KR20130083108A KR 20130083108 A KR20130083108 A KR 20130083108A KR 1020120003657 A KR1020120003657 A KR 1020120003657A KR 20120003657 A KR20120003657 A KR 20120003657A KR 20130083108 A KR20130083108 A KR 20130083108A
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KR
South Korea
Prior art keywords
product
coating
magnesium
washing
washed
Prior art date
Application number
KR1020120003657A
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Korean (ko)
Inventor
김일선
박미선
Original Assignee
(주)만민엔터프라이즈
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to KR1020120003657A priority Critical patent/KR20130083108A/en
Publication of KR20130083108A publication Critical patent/KR20130083108A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/002—Pretreatement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • B05D3/107—Post-treatment of applied coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2502/00—Acrylic polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2504/00—Epoxy polymers

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

PURPOSE: A coating method of a product containing magnesium is provided to improve the corrosion resistance of the product by preventing the activation of magnesium. CONSTITUTION: A coating method of a product containing magnesium comprises the following steps: fat-removing the surface of the product containing magnesium (S10); washing the fat-removed product with clear water (S20); forming an alkali film on the washed product (S30); washing the product with the alkali film with ultra-pure water and ultrasound waves (S40); drying the product washed with ultra-pure water and ultrasound waves (S50); electric coating the dried product (S60); washing the electric coated product with ultra-pure water (S70); and drying the washed product (S80). [Reference numerals] (S10) Fat-removing from the surface of a product; (S20) Washing the fat-removed product with clear water; (S30) Forming an alkali film; (S40) Washing with ultra-pure water and ultrasound waves; (S50,S80) Drying; (S60) Electric coating; (S70) Washing with ultra-pure water

Description

Coating method of products containing magnesium {THE COATING METHOD FOR MAGNESIUM CONTAINING PRODUCT}

The present invention relates to a method for coating a product containing magnesium, and more particularly, to a method for coating a product containing magnesium that can improve the corrosion resistance of the product.

Magnesium (or magnesium alloys) has a small specific gravity, high strength, good castability, machinability, dimensional stability and scratch resistance.

Magnesium has a specific gravity of 1.74g / cm3, which is lighter than 2.7g / cm3 of aluminum, has excellent shock absorption, reduces noise, and has excellent electromagnetic shielding characteristics, which makes it suitable for exterior parts of computer electronic communication components and other electronic components. Is expanding.

From the environmental point of view, there is a tendency to actively use magnesium alloy having excellent recycleability as a structural metal material. For example, in the home appliance field, there is a tendency to shift from conventional plastics to magnesium alloys having excellent recycling characteristics, mainly in the case of notebook personal computers and mobile phones.

However, despite the advantages of such a magnesium alloy, there was a conventional surface treatment technology is insufficient and not utilized much.

In addition, most of these magnesium alloys are formed by the casting method called the die casting method and the thixomolding method.

These casting methods inject molten or semi-molten magnesium alloy into a mold at high speed and high pressure, and are characterized by excellent dimensional accuracy and productivity.

And depending on a product, you may shape | mold by the press molding method or the forging method using a magnesium alloy plate.

These magnesium alloys are the most chemically active metals among commercial metals. In general, magnesium alloys are corroded very quickly in the air or in solution when they are not surface-treated, and are therefore more dense in surface treatment than steel or aluminum alloys. It is important to form a uniform coating.

However, magnesium alloy is also an extremely difficult material to form a dense and uniform coating. This is because the surface of the magnesium alloy is chemically nonuniform.

Therefore, in order to use a magnesium alloy, the magnesium alloy must be surface-treated. Surface-treated magnesium alloys have high corrosion resistance, so durability can be secured when used as interior and exterior parts.

On the other hand, such magnesium-containing products are processed through a machine, and then coated.

In other words, magnesium alloy has a disadvantage of poor corrosion resistance due to the nature of the material, it is essential to the chemical treatment on the surface, one of the most used methods of such chemical treatment is to finish the coating after forming an antioxidant film on the surface There is a process.

However, in the coating of conventional magnesium-containing products, when the coating treatment of the surface of the magnesium-containing product and the cleaning before and after the coating are not neatly performed, the coating is easy even when the magnesium-containing product is coated. Peeled off, there is a problem that corrosion occurs quickly around the peeled off. Therefore, there exists a problem that the corrosion resistance of a product falls.

Therefore, the coating and washing of the product containing magnesium is more important.

An object of the present invention is to provide a method for coating a product containing magnesium, which can prevent the activation of magnesium to improve corrosion resistance.

The object of the present invention is to degrease the surface of the product containing magnesium, to clean the degreased product with fresh water, to form an alkaline coating on the washed product, and to the ultra-pure water Washing with ultrasonic wave together, drying the ultrasonically cleaned product together with the ultrapure water, electroplating the dried product, washing the electrodeposited product with ultrapure water, and washing with the ultrapure water. It is achieved by the method of coating a magnesium-containing product, characterized in that it comprises the step of drying the finished product.

Here, in the step of forming an alkali film on the washed product, the product is characterized in that the film is immersed in a bath containing the alkali solution.

In addition, the paint used in the electrodeposition coating is characterized in that the acrylic paint mixed with epoxy.

According to the present invention, by forming an alkali coating on a product containing magnesium, by ultrasonically washing with ultrapure water prior to electrodeposition coating the product on which the alkali coating is formed, and also after washing the coated product with ultrapure water, By preventing the activation of magnesium can improve the corrosion resistance of the product.

1 is a flowchart of a coating method of a product containing magnesium according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the coating method of the product containing magnesium of the present invention.

First, degreasing the surface of the product containing magnesium (S10). At this time, cutting oil, grease or the like adhering to the surface of the product is removed using a solvent such as petroleum, aromatic or chlorine. Then, general dirt, lubricants, cutting agents, etc. are removed using an alkaline solution such as caustic soda.

Next, the degreased product is washed with fresh water (clean water) (S20). At this time, washing is performed 2-3 times with fresh water.

Subsequently, an alkaline film is formed on the washed product (S30). At this time, the washed product is immersed in a bath containing the alkaline solution to form an alkali coating.

Here, the alkaline film may be formed by applying the alkaline solution to the surface of the washed product using a spray gun or the like without immersing the washed product in the bath containing the alkaline solution.

In this way, by forming an alkali coating on the washed product, the adhesion of the coating is improved and the corrosion resistance is improved.

Subsequently, when the alkali film is formed on the product containing magnesium, the product on which the alkali film is formed is ultrasonically washed with ultrapure water (S40).

Ultrapure water refers to pure water in which physically and chemically compounds and synthetic materials, such as 17 MΩ / cm to 18 MΩ / cm, have electrical resistivity.

Ultrasonic cleaning uses ultrasonic wave oscillator using piezoelectric phenomena to generate ultrasonic waves of strong vibration in the fluid.The cavitation and bubbles are generated in the fluid and the vibration, growth, explosion and instantaneous high temperature Through the process, it refers to cleaning by decomposing or oxidizing the foreign matter and micron impurities attached to the surface of the object to be cleaned in the fluid.

Thus, an ultrasonic oscillator is installed in a washing tank containing ultrapure water, ultrasonic waves are generated by the oscillation operation of the ultrasonic oscillator, and irradiated onto a product on which an alkaline film injected into the washing tank is formed through ultrapure water, which is a wave propagation medium, and the surface of the product on which the alkaline film is formed. By decomposing or oxidizing the foreign matter and impurities attached to the product, the product on which the alkali coating is formed is washed.

Here, by cleaning the product by ultrasonic with ultrapure water to remove foreign matter before coating, it is possible to prevent the activation of magnesium.

Then, the ultrasonically washed product with ultrapure water is dried (S50). At this time, drying of the washed product is performed once or twice in a drying furnace.

Subsequently, the dried product is electrodeposition coated using an electrodeposition coating apparatus (S60).

Electrodeposition painting work, in one embodiment by hanging the product to be electrodeposited in a rack (rack) and immersed it in a treatment tank containing the paint, apply a positive (+) to the treatment tank and apply a negative electrode (-) to the product to be painted By applying, the electrolytic action proceeds to the anode current supplied to the treatment tank and the product to be coated, and the coating is electrodeposited to the product to perform painting.

Here, it is more effective that the coating material used at the time of electrodeposition painting is acrylic paint mixed with epoxy. In the case of epoxy paints mixed with acrylic, the metal texture and high gloss of magnesium alloy are easily realized.

Next, the electrodeposited product is washed with water. Here, the water to be washed uses a filter and contaminated filtered water using an ultra filter.

Then, the electrodeposited product washed with water is washed with ultrapure water (S70). By washing the electrodeposited product with ultrapure water, fine foreign matter adhering to the surface of the product is removed, thereby preventing the activation of magnesium in the coated product.

Subsequently, the product washed with ultrapure water is dried in a drying furnace (S80).

This completes the painting of the product containing magnesium according to the invention.

As described above, according to the present invention, after forming an alkali coating on a product containing magnesium, the ultrasonic coating is cleaned with ultrapure water prior to electrodeposition coating of the product on which the alkali coating is formed, and after the electrodeposition coating, the coated product is ultrapure. By washing, it is possible to prevent the activation of magnesium to improve the corrosion resistance of the product.

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 and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

Claims (3)

Degreasing the surface of the product containing magnesium,
Washing the degreased product with fresh water,
Forming an alkali film on the washed product;
Ultrasonically washing the product with the alkaline coating formed with ultrapure water,
Drying the ultrasonically cleaned product together with the ultrapure water;
Electrodeposition coating the dried product;
Washing the electrodeposited product with ultrapure water,
Magnesium-containing product coating method comprising the step of drying the product washed with ultrapure water. The method of claim 1,
In the step of forming an alkali coating on the washed product, the product is immersed in a bath containing an alkali solution to form a coating, characterized in that for coating the product containing magnesium. The method of claim 1,
The coating method used for the electrodeposition coating is a coating method for a product containing magnesium, characterized in that the acrylic paint mixed with epoxy.
KR1020120003657A 2012-01-12 2012-01-12 The coating method for magnesium containing product KR20130083108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120003657A KR20130083108A (en) 2012-01-12 2012-01-12 The coating method for magnesium containing product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120003657A KR20130083108A (en) 2012-01-12 2012-01-12 The coating method for magnesium containing product

Publications (1)

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KR20130083108A true KR20130083108A (en) 2013-07-22

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KR1020120003657A KR20130083108A (en) 2012-01-12 2012-01-12 The coating method for magnesium containing product

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