KR101758474B1 - Magnesium-based metal material with moisture-resistant impact resistance and method for manufacturing the same - Google Patents
Magnesium-based metal material with moisture-resistant impact resistance and method for manufacturing the same Download PDFInfo
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- KR101758474B1 KR101758474B1 KR1020150170032A KR20150170032A KR101758474B1 KR 101758474 B1 KR101758474 B1 KR 101758474B1 KR 1020150170032 A KR1020150170032 A KR 1020150170032A KR 20150170032 A KR20150170032 A KR 20150170032A KR 101758474 B1 KR101758474 B1 KR 101758474B1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0227—Pretreatment of the material to be coated by cleaning or etching
- C23C16/0245—Pretreatment of the material to be coated by cleaning or etching by etching with a plasma
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
- C23C16/45536—Use of plasma, radiation or electromagnetic fields
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/56—After-treatment
Abstract
A magnesium-based metallic material and a magnesium-based metallic material, which are formed on at least one surface of the magnesium-based base material and include an inorganic coating layer formed on the inorganic coating layer and containing an organic compound layer and a polyvinylidene- Coating a composition comprising a siloxane precursor on at least one side of the inorganic coating layer with an atmospheric pressure plasma to form an inorganic coating layer; and coating a composition comprising a polyvinylidene-based polymer on the inorganic coating layer to form an organic coating layer It is possible to prevent the environmental pollution caused by chromium and to greatly improve the moisture resistance and impact resistance of the magnesium-based metal material by providing a surface treatment method of a magnesium-based metal material that can replace the existing chromate treatment technique .
Description
The present invention relates to a magnesium-based metal material excellent in moisture resistance and impact resistance and a method for producing the same.
Magnesium is superior to conventional plastics in strength and stiffness, has good processability and can be thinned, making it a new material for dreams of the 21st century. It is a high-precision and high-value-added product that requires technology in various fields such as design, precision mold, precision machining, metal engineering, painting and so on. Its use and market size rapidly expand in automobile, aerospace, have. However, since magnesium has the lowest standard potential among the practical metals, it is very easy to be oxidized in the atmosphere. That is, the magnesium alloy has a drawback that it is very weak in corrosion resistance, so that surface treatment for increasing the corrosion resistance is inevitable.
Conventionally, in order to impart moisture resistance and corrosion resistance to the magnesium material, a surface treatment method of coating a chromate film containing chromium as a main component on the surface of the magnesium material has generally been carried out. The main chromate treatment includes an electrolytic chromate and a coating type chromate. Of these electrolytic chromate treatments, a treatment liquid containing hexavalent chromium as a main component and various anions such as sulfuric acid, phosphoric acid, boric acid and halogen is used Thereby treating the magnesium material. On the other hand, in the coating-type chromate treatment, inorganic colloid and inorganic ion are added to a solution in which a part of hexavalent chromium is reduced in advance in advance, and then the mixture is mixed to prepare a treatment liquid. The magnesium material is immersed in the treatment liquid, It is a method of spraying on a magnesium material.
However, due to the toxicity of the hexavalent chromium contained in the chromate treatment liquid, the above-mentioned chromate film-coating surface treatment method requires various measures in the working environment and in the drainage treatment, etc., and recycling and disposal of household electrical appliances and building materials using the surface- In the processing, human health and environment pollution problems are also caused. In addition, when trivalent chromium is applied, a part of trivalent chromium is converted to hexavalent chromium by the surrounding environment such as temperature and microorganisms.
The present invention provides a surface treatment method of a magnesium-based metal material that can replace a conventional chromate treatment technique.
The present invention also provides a magnesium-based metal material excellent in moisture resistance and impact resistance and a method for producing the same.
According to an embodiment of the present invention, there is provided a method for manufacturing a magnesium-based base material, comprising: forming a magnesium-based base material, an inorganic coating layer formed on at least one side of the magnesium- based base material and containing a silicon- A magnesium-based metal material excellent in moisture resistance and impact resistance is provided.
The silicon-based compound may be at least one selected from the group consisting of silicon oxide, silicon nitride, siloxane, and siloxane precursor.
The inorganic coating layer may have a thickness of 10 to 1000 nm.
The polyvinylidene-based polymer may be selected from the group consisting of poly (vinylidene fluoride), poly (vinylidene chloride), poly (vinylidene fluoride-co-hexafluoropropylene) (Vinylidene chloride-co-acrylonitrile), poly (vinylidene fluoride-co-hexafluoropropylene), poly (vinylidene chloride-co-acrylonitrile) (Vinylidene chloride-co-vinyl methacrylate), poly (vinylidene chloride-co-vinyl chloride) and poly (vinylidene chloride- Poly (vinylidene chloride-co-methyl acrylate)].
The organic coating layer may have a thickness of 5 to 20 mu m.
According to another embodiment of the present invention, there is provided a method for manufacturing a magnesium-based composite material, comprising the steps of: coating a composition containing a siloxane precursor on at least one surface of a magnesium-based base material with an atmospheric pressure plasma to form an inorganic coating layer; And forming an organic coating layer on the surface of the magnesium-based metallic material. The magnesium-based metallic material is excellent in moisture resistance and impact resistance.
The atmospheric pressure plasma may have a temperature of 100 DEG C or less.
The atmospheric pressure plasma may have an output of 200 to 300 W in the plasma apparatus.
The polyvinylidene-based polymer may be selected from the group consisting of poly (vinylidene fluoride), poly (vinylidene chloride), poly (vinylidene fluoride-co-hexafluoropropylene) (Vinylidene chloride-co-acrylonitrile), poly (vinylidene fluoride-co-hexafluoropropylene), poly (vinylidene chloride-co-acrylonitrile) (Vinylidene chloride-co-vinyl methacrylate), poly (vinylidene chloride-co-vinyl chloride) and poly (vinylidene chloride- Poly (vinylidene chloride-co-methyl acrylate)].
And pre-treating the magnesium base material with an atmospheric pressure plasma.
The pretreatment may be performed in an atmospheric environment.
And curing the inorganic coating layer.
The curing may be at least one selected from the group consisting of a near-infrared (NIR) heating method, infrared light (IR), and hot air.
The curing may be carried out at a temperature ranging from 100 to 200 ° C.
The present invention provides a surface treatment method of a magnesium-based metal material that can replace a conventional chromate treatment technique, thereby preventing environmental pollution caused by chromium and greatly improving the moisture resistance and impact resistance of the magnesium-based metal material.
Fig. 1 is a photograph of the results obtained after the corrosion resistance evaluation in Examples 1 and 2. Fig.
2 is a photograph of the results of corrosion resistance evaluation of Comparative Examples 3 and 4.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.
Conventionally, in order to impart corrosion resistance to a magnesium material, a surface treatment method in which a chromate film containing chromium as a main component is coated is mainly used. However, toxicity of hexavalent chromium causes human health and environment pollution. Therefore, the inventors of the present invention have conducted extensive studies to obtain a surface treatment technique of a magnesium material that can replace the conventional chromate treatment technique. As a result, they have found that a composition containing a siloxane precursor is coated on a magnesium material surface with an atmospheric plasma to form a coating layer And that when the composition containing the vinylidene polymer is coated on the coating layer, the magnesium material has excellent moisture resistance and impact resistance, and the present invention has been accomplished.
According to an embodiment of the present invention, there is provided a method for manufacturing a magnesium-based base material, comprising: forming a magnesium-based base material, an inorganic coating layer formed on at least one side of the magnesium- based base material and containing a silicon- It is possible to provide a magnesium-based metal material excellent in moisture resistance and impact resistance.
Preferably, the magnesium-based base material is subjected to color development in order to realize metal texture and corrosion resistance. An inorganic coating layer containing a silicon-based compound may be formed on at least one surface of the magnesium base material, and the silicon-based compound may be at least one selected from the group consisting of silicon oxide, silicon nitride, siloxane, and siloxane precursor.
The inorganic coating layer preferably has a thickness of 10 to 1000 nm, more preferably 30 to 300 nm. If the thickness of the coating layer is less than 10 nm, sufficient corrosion resistance can not be provided. If the thickness is more than 1000 nm, the workability can be reduced.
An organic coating layer may be formed on the inorganic coating layer, and the organic coating layer may include a polyvinylidene polymer. The polyvinylidene-based polymer may be selected from the group consisting of poly (vinylidene fluoride), poly (vinylidene chloride), poly (vinylidene fluoride-co-hexafluoropropylene) (Vinylidene chloride-co-acrylonitrile), poly (vinylidene fluoride-co-hexafluoropropylene), poly (vinylidene chloride-co-acrylonitrile) (Vinylidene chloride-co-vinyl methacrylate), poly (vinylidene chloride-co-vinyl chloride) and poly (vinylidene chloride- Poly (vinylidene chloride-co-methyl acrylate)].
The organic coating layer preferably has a thickness of 5 to 20 mu m. If the thickness of the organic coating layer is less than 5 mu m, the impact resistance of the magnesium-based metallic material is insufficient. If the thickness is more than 20 mu m, the metallic texture may be deteriorated.
According to another embodiment of the present invention, there is provided a method for manufacturing a magnesium-based composite material, comprising the steps of: coating a composition containing a siloxane precursor on at least one surface of a magnesium-based base material with an atmospheric pressure plasma to form an inorganic coating layer; And forming an organic coating layer on the surface of the magnesium-based metallic material, which is excellent in moisture resistance and impact resistance.
The magnesium-based base material may be colored to provide a metal texture and corrosion resistance. Before forming the inorganic coating layer on the surface of the magnesium base material, the magnesium base material may be pretreated with an atmospheric plasma to impart activity to the surface of the magnesium base material.
Since the atmospheric pressure plasma is formed at atmospheric pressure, it does not require a high-cost vacuum system as in the case of forming a low-pressure (or vacuum) plasma plasma, Can be improved. Therefore, in the present invention, after the plasma is generated using microwave under atmospheric pressure, the magnesium base material can be pretreated.
The pretreatment may be performed in an atmospheric environment. Since plasma pretreatment is performed in the atmospheric environment, it is possible to remove chemical contaminants which are very efficient in removing organic substances on the surface of the magnesium base material and can be generated on the surface. In addition, the activity of the magnesium-based base material can be enhanced, and the adhesion between the inorganic coating layer and the magnesium base material to be formed at a later stage can be enhanced.
If the output of the plasma apparatus is less than 200 W, plasma generation may be difficult. If the output of the plasma apparatus is more than 300 W, plasma oxidation may occur.
An inorganic coating layer may be formed by coating a composition containing a siloxane precursor on at least one side of the magnesium-based base material, which has been pretreated with an atmospheric pressure plasma, with an atmospheric pressure plasma.
The composition comprising the siloxane precursor may comprise a solvent. The kind of the solvent is not particularly limited as long as it is a volatile substance, but is preferably at least one selected from the group consisting of alcohol, methanol and distilled water.
The method of forming a coating layer using atmospheric plasma may be performed by applying a current to a pair of electrodes opposing each other at a constant interval to generate a DC or AC atmospheric plasma between the electrodes. When the magnesium base material is passed together with the composition including the siloxane precursor between the two electrodes on which the atmospheric pressure plasma is generated, a coating layer may be formed on the surface of the magnesium base material.
The siloxane precursor that passes between the electrodes where the atmospheric pressure plasma is generated can undergo the radical polymerization reaction due to the energy of the atmospheric pressure plasma. Therefore, the siloxane precursor may undergo a radical polymerization reaction to produce a silicon-based compound, and the silicon-based compound may collide with the surface of the magnesium-based base material to form an inorganic coating layer.
The silicon-based compound is not particularly limited as long as it is a silicon-based compound that can be produced by the radical polymerization of the siloxane precursor, but may be at least one selected from the group consisting of silicon oxide, silicon nitride, siloxane, and siloxane precursor.
The atmospheric pressure plasma preferably has a temperature of 100 ° C or lower, and when the temperature exceeds 100 ° C, thermal deformation is applied to the metal thin plate, which may be a problem due to structural deformation or electrochemical characteristics. The lower limit of the plasma temperature is not particularly limited, but it is preferably carried out at a temperature of from room temperature to 100 ° C for ease of work.
If the output of the plasma apparatus is less than 200 W, plasma generation may be difficult. If the output of the plasma apparatus is more than 300 W, plasma oxidation may occur.
The siloxane precursors include, but are not limited to, triethoxyphenylsilane, methyltriethoyxsilane, phenyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane ( 3-glycidoxypropyltrimethoxysiane, organosiloxane oligomer flakes, triethoxysilane, aminoproyl triethoxysilane, trimethoxysilylpropyl ethylenediamine, trimethoxysilylpropyl allylamine, (trimethoxysilylpropyl allylamine), and trimethoxysilylpropyl butylamine.
After the inorganic coating layer is formed by coating a composition containing a siloxane precursor on at least one side of the magnesium base material with an atmospheric pressure plasma, the inorganic coating layer can be cured and stabilized.
The curing may be, but is not limited to, one or more methods selected from the group consisting of near infrared (NIR), infrared (IR), and hot air, for example, Most preferred.
If the temperature is less than 100 ° C., the coating layer may be uncured to insufficient corrosion resistance. If the temperature is higher than 200 ° C., the metal thin plate may be oxidized or thermally deformed and may be bent have.
The organic coating layer can be formed by coating a composition containing a polyvinylidene-based polymer on the cured inorganic coating layer. The coating can be, but is not limited to, one or more methods selected from the group consisting of an impregnation method, a spray method, a spin coating method and a bar coating method.
The polyvinylidene-based polymer may be selected from the group consisting of poly (vinylidene fluoride), poly (vinylidene chloride), poly (vinylidene fluoride-co-hexafluoropropylene) (Vinylidene chloride-co-acrylonitrile), poly (vinylidene fluoride-co-hexafluoropropylene), poly (vinylidene chloride-co-acrylonitrile) (Vinylidene chloride-co-vinyl methacrylate), poly (vinylidene chloride-co-vinyl chloride) and poly (vinylidene chloride- Poly (vinylidene chloride-co-methyl acrylate)].
Hereinafter, the present invention will be described more specifically by way of specific examples. The following examples are provided to aid understanding of the present invention, and the scope of the present invention is not limited thereto.
Example
[Example 1]
A magnesium plate having a thickness of 0.7 mm was activated by pretreatment with an atmospheric plasma in an air atmosphere. 20% by weight of triethoxysilane and 80% by weight of methanol were mixed to prepare a coating composition, and an activated magnesium plate was passed through the atmospheric pressure plasma facility together with the coating composition to form an inorganic coating layer having a thickness of 30 nm on the surface of the magnesium plate / RTI > The atmospheric pressure plasma was formed at a temperature of 100 DEG C and an output of 200W. The inorganic coating layer was cured at a temperature of 100 캜 using near infrared light to prepare a stabilized inorganic coating layer.
An organic coating layer composition was prepared using 25% by weight of water-soluble polyvinylidene chloride (PVDC) colloidal particles and 75% by weight of methanol. The composition was coated on the inorganic coating layer to form an organic coating layer having a thickness of 10 mu m, followed by drying at a temperature of 100 ° C.
[Example 2]
A magnesium plate having a coating layer formed thereon was prepared in the same manner as in Example 1, except that polvovinylidene fluoride (PVDF) was used instead of polyvinylidene chloride (PVDC) and a magnesium plate subjected to color development was used .
[Comparative Example 1]
A magnesium plate having a coating layer formed thereon was prepared in the same manner as in Example 1, except that an organic coating layer was not formed on the inorganic coating layer.
[Comparative Example 2]
A magnesium plate having a coating layer formed thereon was prepared in the same manner as in Example 1, except that an inorganic coating layer was formed using a vacuum plasma.
[Comparative Example 3]
A magnesium plate having a coating layer formed thereon was prepared in the same manner as in Example 1, except that 25 wt% of water-dispersible polyurethane resin was used instead of polyvinylidene chloride (PVDC) to form an organic coating layer.
[Comparative Example 4]
Anhydrous chromic acid was dissolved in ion-exchanged water to prepare a chromic acid solution having a chromium concentration of 0.6 g / L, and a chromate treatment solution having a pH of 5.7 was prepared using caustic soda. A magnesium plate having a thickness of 20 탆 was prepared, the magnesium plate was immersed in a chromate treatment solution for 3 seconds, the solution was removed to form a chromium coating layer, and the magnesium plate having the chromium coating layer formed thereon was immersed in heated air at a temperature of 100 캜 for 3 seconds And dried.
25% by weight of water-dispersible polyurethane resin and 75% by weight of methanol were mixed to prepare an organic coating layer composition. The composition was coated on the inorganic coating layer to form an organic coating layer having a thickness of 10 탆, followed by drying at a temperature of 100 캜.
[Comparative Example 5]
A magnesium plate having a coating layer formed thereon was prepared in the same manner as in Comparative Example 4, except that an urethane-based polymer was used instead of the acrylic polymer to form an organic coating layer.
The components contained in the inorganic coating layers and the organic coating layers of Examples 1 to 2 and Comparative Examples 1 to 5 were examined by ICP mass spectrometry and the evaluation methods described below were used to determine the contents of the components of Examples 1 to 2 and Comparative Examples 1 to 5 The wettability and the impact resistance were evaluated. The results are shown in Table 1.
≪ Evaluation of moisture resistance &
Moisture resistance was evaluated as a result of discoloration of the surface of the magnesium-coated magnesium material at salt concentration 85% and 85 ° C after 72 hours.
◎: Not discolored
○: The discolored area exceeds 0% to 5% or less
?: The discolored area exceeds 5% and is 30% or less
X: The discolored area exceeds 30%
≪ Evaluation of impact resistance &
The impact resistance was evaluated by using a steel ball drop test. For the steel ball drop test, a method similar to ISO 14368-3 of "Dimension of watch glass, test method" standard was applied. That is, the composite plate obtained in Example or Comparative Example was fixed with a double-faced tape having a thickness of 0.1 mm (manufactured by 3M, product number "4511-100") on a flat aluminum alloy (50 mm x 52 mm) , And a steel ball of 130 g was freely dropped from an arbitrary height at the center position of the composite plate to measure the maximum height at which no crack occurred. For the impact surface, mirror surface polished surface roughness Ra = 0.02 탆 or less was used.
◎: Breaking height is 100 cm ○: Breaking height is 70 cm
DELTA: Breaking height: 50 cm x Breaking height: 10 cm
According to the results shown in Table 1, Examples 1 and 2 exhibit excellent effects of both moisture resistance and impact resistance. Fig. 1 (a) is a photograph of the result of the moisture resistance evaluation of Example 1, and Fig. 1 (b) is a photograph of the result of moisture resistance evaluation of Example 2. As shown in Fig. 1, Examples 1 and 2 confirmed that no corrosion occurred.
On the other hand, Comparative Example 1 had no effect of forming an organic coating layer, and exhibited an effect of heating at impact resistance. In Comparative Example 2, an inorganic coating layer was formed in a vacuum plasma.
In addition, in Comparative Example 3, an organic coating layer was formed of an acrylic polymer and the moisture resistance and impact resistance were heat-treated. In Comparative Examples 4 and 5, the chromate treatment showed the effect of improving the corrosion resistance and the etching property. Fig. 2 (a) is a photograph of the result after the corrosion resistance evaluation of Comparative Example 3, and Fig. 2 (b) is a photograph of the result after the evaluation of the Comparative Example of Comparative Example 4. As shown in FIG. 2, it was confirmed that Comparative Examples 3 and 4 had low corrosion resistance.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.
Claims (14)
The magnesium base material is pretreated with plasma at atmospheric pressure and atmospheric pressure,
An inorganic coating layer coated on at least one surface of the magnesium base material with an atmospheric pressure plasma and containing a silicon-based compound; And
An organic coating layer formed on the inorganic coating layer and including a polyvinylidene-
Wherein the magnesium-based metal material is excellent in moisture resistance and impact resistance.
The silicon-based compound is at least one selected from the group consisting of silicon oxide, silicon nitride, siloxane, and siloxane precursor, and is excellent in moisture resistance and impact resistance.
The inorganic coating layer has a thickness of 10 to 1000 nm and is excellent in moisture resistance and impact resistance.
The polyvinylidene-based polymer may be selected from the group consisting of poly (vinylidene fluoride), poly (vinylidene chloride), poly (vinylidene fluoride-co-hexafluoropropylene) (Vinylidene chloride-co-acrylonitrile), poly (vinylidene fluoride-co-hexafluoropropylene), poly (vinylidene chloride-co-acrylonitrile) (Vinylidene chloride-co-vinyl methacrylate), poly (vinylidene chloride-co-vinyl chloride) and poly (vinylidene chloride- (Vinylidene chloride-co-methyl acrylate)], which is excellent in moisture resistance and impact resistance.
Wherein the organic coating layer has a thickness of 5 to 20 占 퐉, and is excellent in moisture resistance and impact resistance.
Coating a composition containing a siloxane precursor on at least one surface of a magnesium-based base material with an atmospheric pressure plasma to form an inorganic coating layer; And
Coating a composition comprising a polyvinylidene-based polymer on the inorganic coating layer to form an organic coating layer
Wherein the magnesium-based metal material has excellent moisture resistance and impact resistance.
Wherein the atmospheric pressure plasma has a temperature ranging from room temperature to 100 캜, and is excellent in moisture resistance and impact resistance.
Wherein the atmospheric pressure plasma has an output of 200 to 300 W in the plasma apparatus, and is excellent in moisture resistance and impact resistance.
The polyvinylidene-based polymer may be selected from the group consisting of poly (vinylidene fluoride), poly (vinylidene chloride), poly (vinylidene fluoride-co-hexafluoropropylene) (Vinylidene chloride-co-acrylonitrile), poly (vinylidene fluoride-co-hexafluoropropylene), poly (vinylidene chloride-co-acrylonitrile) (Vinylidene chloride-co-vinyl methacrylate), poly (vinylidene chloride-co-vinyl chloride) and poly (vinylidene chloride- (Vinylidene chloride-co-methyl acrylate)], which is excellent in moisture resistance and impact resistance.
Further comprising a step of curing the inorganic coating layer, wherein the inorganic coating layer is cured.
Wherein the curing is performed by at least one method selected from the group consisting of near-infrared light (NIR), infrared light (NIR), and hot air.
Wherein the curing is carried out at a temperature in the range of 100 to 200 캜, and is excellent in moisture resistance and impact resistance.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190077833A (en) | 2017-12-26 | 2019-07-04 | 주식회사 포스코 | COATING COMPOSITION FOR SURFACE TREATMENT OF Mg-CONTAINING GALVANIZED STEEL SHEET AND GOATED STEEL SHEET WITH THE SAME |
| WO2020045869A1 (en) | 2018-08-31 | 2020-03-05 | 주식회사 포스코 | Composition for surface treatment of mg-containing galvanized steel sheet and mg-containing galvanized steel sheet surface-treated using same |
| KR20200064580A (en) | 2018-11-29 | 2020-06-08 | 주식회사 포스코 | COMPOSITION FOR SURFACE TREATMENT OF Mg-CONTAINING GALVANIZED STEEL SHEET AND Mg-CONTAINING GALVANIZED STEEL SHEET SURFACE-TREATED USING THE SAME |
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| JP2000212725A (en) * | 1999-01-21 | 2000-08-02 | Matsushita Electric Ind Co Ltd | Magnesium substrate, its production and method for modifying surface of substrate |
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| JP2000212725A (en) * | 1999-01-21 | 2000-08-02 | Matsushita Electric Ind Co Ltd | Magnesium substrate, its production and method for modifying surface of substrate |
| KR101117800B1 (en) * | 2009-08-12 | 2012-03-09 | 주식회사 포스코 | Surface treatment process for magnesium parts and magnesium parts treated by using the same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190077833A (en) | 2017-12-26 | 2019-07-04 | 주식회사 포스코 | COATING COMPOSITION FOR SURFACE TREATMENT OF Mg-CONTAINING GALVANIZED STEEL SHEET AND GOATED STEEL SHEET WITH THE SAME |
| WO2020045869A1 (en) | 2018-08-31 | 2020-03-05 | 주식회사 포스코 | Composition for surface treatment of mg-containing galvanized steel sheet and mg-containing galvanized steel sheet surface-treated using same |
| KR20200025830A (en) | 2018-08-31 | 2020-03-10 | 주식회사 포스코 | COMPOSITION FOR SURFACE TREATMENT OF Mg-CONTAINING GALVANIZED STEEL SHEET AND Mg-CONTAINING GALVANIZED STEEL SHEET SURFACE-TREATED USING THE SAME |
| KR102164100B1 (en) | 2018-08-31 | 2020-10-12 | 주식회사 포스코 | COMPOSITION FOR SURFACE TREATMENT OF Mg-CONTAINING GALVANIZED STEEL SHEET AND Mg-CONTAINING GALVANIZED STEEL SHEET SURFACE-TREATED USING THE SAME |
| KR20200064580A (en) | 2018-11-29 | 2020-06-08 | 주식회사 포스코 | COMPOSITION FOR SURFACE TREATMENT OF Mg-CONTAINING GALVANIZED STEEL SHEET AND Mg-CONTAINING GALVANIZED STEEL SHEET SURFACE-TREATED USING THE SAME |
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| Publication number | Publication date |
|---|---|
| KR20170064620A (en) | 2017-06-12 |
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