KR20130074648A - Coated steel sheet and method for manufacturing the same - Google Patents

Coated steel sheet and method for manufacturing the same Download PDF

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KR20130074648A
KR20130074648A KR1020110142800A KR20110142800A KR20130074648A KR 20130074648 A KR20130074648 A KR 20130074648A KR 1020110142800 A KR1020110142800 A KR 1020110142800A KR 20110142800 A KR20110142800 A KR 20110142800A KR 20130074648 A KR20130074648 A KR 20130074648A
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steel sheet
layer
magnesium
aluminum
aluminum layer
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KR1020110142800A
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Korean (ko)
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양지훈
정재인
김태엽
정용화
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재단법인 포항산업과학연구원
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Priority to KR1020110142800A priority Critical patent/KR20130074648A/en
Publication of KR20130074648A publication Critical patent/KR20130074648A/en

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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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment
    • C23C14/5806—Thermal treatment
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Coating With Molten Metal (AREA)
  • Physical Vapour Deposition (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

PURPOSE: A plated steel sheet and a manufacturing method thereof are provided to form an aluminum layer retaining magnesium uniformly on the steel sheet without forming an aluminum-magnesium alloy layer, thereby improving the cohesive power with steel sheet. CONSTITUTION: A plated steel sheet manufacturing method includes: a step of coating an aluminum layer on a steel sheet (10); a step of coating a magnesium layer (30a) on the aluminum layer; a step of forming an aluminum layer (20a) retaining magnesium on the steel sheet by heat-treating the steel sheet in which the aluminum layer and the magnesium layer are coated. A thickness ratio of the aluminum layer and the magnesium layer is more than 4:1. The heat treatment is performed for 5-20 minutes at a temperature of 100-400°C.

Description

도금 강판 및 이의 제조방법{COATED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated steel sheet,

본 발명은 도금 강판 및 이의 제조방법에 관한 것으로서, 보다 구체적으로는 강판 표면에 마그네슘이 고용된 알루미늄층을 코팅한 강판 및 그 제조방법에 관한 것이다.The present invention relates to a plated steel sheet and a method of manufacturing the same, and more particularly, to a steel sheet coated with an aluminum layer in which magnesium is dissolved in a steel sheet surface and a method for manufacturing the same.

강판은 일반적으로 부식을 방지하기 위해 표면에 아연이나 알루미늄을 용융 도금 방법 또는 전기 도금 방법을 이용하여 단일층을 코팅하거나 아연과 알루미늄의 합금 또는 아연과 마그네슘의 합금을 코팅한다. The steel sheet generally is coated with a single layer of zinc or aluminum on its surface using a hot-dip coating method or an electroplating method, or an alloy of zinc and aluminum or an alloy of zinc and magnesium to prevent corrosion.

알루미늄과 알루미늄 합금을 강판에 도금할 때, 용융 도금 방법 또는 전기 도금 방법과 같은 방법으로 도금하는 경우 강판과 코팅층의 계면에 불균일한 합금층이 형성되는데 이러한 합금층은 알루미늄-실리콘-철 또는 알루미늄-철 등의 합금상을 갖는다. 이러한 합금상은 강판과 코팅층 간의 밀착력을 저하시켜 쉽게 박리가 일어나기 때문에 기계적인 특성뿐만 아니라 내식성을 저하시키는 원인이 된다.When plating a steel sheet with aluminum and an aluminum alloy by a method such as a hot-dip coating method or an electroplating method, a non-uniform alloy layer is formed at the interface between the steel sheet and the coating layer. Such an alloy layer is aluminum- Iron and the like. Such an alloy phase deteriorates the adhesion between the steel sheet and the coating layer and easily peels off, which causes deterioration of corrosion resistance as well as mechanical properties.

또한 알루미늄과 마그네슘, 또는 이들의 합금 역시 강판의 부식을 방지하기 위한 보호막으로 이용하기 위해 강판 위에 코팅되는데, 용융 도금 방법, 전기 도금 방법으로 강판 위에 코팅하는 경우 도금되는 물질의 합금상을 제어하기 용이하지 않으며, 다양한 합금상이 코팅층 내에 존재하기 때문에 균일한 코팅층을 형성하기 어렵다는 문제점이 있었다. Also, aluminum, magnesium, or their alloys are coated on the steel sheet to be used as a protective film for preventing corrosion of the steel sheet. When the steel sheet is coated on the steel sheet by the hot-dip coating method or the electroplating method, it is easy to control the alloy phase of the material to be plated And there is a problem that it is difficult to form a uniform coating layer because various alloy phases exist in the coating layer.

본 발명의 일측면은 알루미늄-마그네슘 합금층을 형성하지 않으면서 마그네슘이 고용된 알루미늄층을 강판 위에 형성할 수 있는 도금 강판의 제조방법을 제공하는 것이다. 본 발명의 다른 측면은 알루미늄층에 마그네슘이 균일하게 고용되도록 할 수 있는 도금 강판의 제조방법을 제공하는 것이다.One aspect of the present invention is to provide a method for manufacturing a plated steel sheet which can form an aluminum layer in which magnesium is dissolved is formed on a steel sheet without forming an aluminum-magnesium alloy layer. Another aspect of the present invention is to provide a method for producing a plated steel sheet that allows magnesium to be uniformly dissolved in the aluminum layer.

또한 본 발명의 다른 일측면은 알루미늄-마그네슘 합금층을 형성하지 않으면서 강판과 코팅층 간의 밀착력이 우수하며, 내식성 및 기계적 특성이 우수한 도금 강판 및 이의 제조방법을 제공하는 것이다.In addition, another aspect of the present invention is to provide a plated steel sheet having excellent adhesion between the steel sheet and the coating layer, excellent corrosion resistance and mechanical properties without forming an aluminum-magnesium alloy layer, and a method of manufacturing the same.

본 발명에 따른 도금 강판의 제조방법은 강판 위에 알루미늄층을 코팅하는 단계; 알루미늄층에 마그네슘층을 코팅하는 단계; 및 알루미늄층 및 마그네슘층이 코팅된 강판을 열처리하여, 강판 위에 마그네슘이 고용된 알루미늄층을 형성시키는 단계;를 포함한다. A method of manufacturing a coated steel sheet according to the present invention includes: coating an aluminum layer on a steel sheet; Coating an aluminum layer with a magnesium layer; And heat-treating the steel sheet coated with the aluminum layer and the magnesium layer to form an aluminum layer in which magnesium is dissolved on the steel sheet.

본 발명에 따른 도금 강판의 제조방법에 있어서, 알루미늄층 및 마그네슘 층은 진공 상태에서 증착에 의해 형성되는 것이 바람직하다. In the method of manufacturing a coated steel sheet according to the present invention, it is preferable that the aluminum layer and the magnesium layer are formed by vapor deposition in a vacuum state.

본 발명에 따른 도금 강판의 제조방법에 있어서, 알루미늄층이 마그네슘층보다 더 두껍게 형성되는 것이 바람직하다. In the method for producing a coated steel sheet according to the present invention, it is preferable that the aluminum layer is formed thicker than the magnesium layer.

여기서 알루미늄층과 마그네슘층의 두께 비는 4 : 1 이상인 것이 바람직하다.It is preferable that the thickness ratio of an aluminum layer and a magnesium layer is 4: 1 or more here.

본 발명에 따른 도금 강판의 제조방법에 있어서, 열처리는 100 ~ 400 ℃에서 행하는 것이 바람직하다.In the manufacturing method of the plated steel sheet which concerns on this invention, it is preferable to perform heat processing at 100-400 degreeC.

여기서, 열처리는 1 ~ 20분 동안 행하는 것이 바람직하다.Here, it is preferable to perform heat processing for 1 to 20 minutes.

본 발명에 따른 도금 강판은 상기의 제조방법들로 제조된다. The coated steel sheet according to the present invention is manufactured by the above-described manufacturing methods.

본 발명의 실시예들에 따르면 알루미늄-마그네슘 합금층을 형성하지 않으면서 마그네슘이 고용된 알루미늄층을 균일하게 강판 위에 형성함으로써, 강판과 코팅층 간의 밀착력을 향상시킬 수 있다.According to the embodiments of the present invention, by forming the aluminum-solid solution aluminum layer uniformly on the steel sheet without forming the aluminum-magnesium alloy layer, it is possible to improve the adhesion between the steel sheet and the coating layer.

또한 본 발명의 실시예들에 따르면 알루미늄층에 마그네슘이 균일하게 고용되도록 함으로써, 내식성 및 기계적 특성을 향상시킬 수 있다.In addition, according to embodiments of the present invention by allowing magnesium to be uniformly dissolved in the aluminum layer, it is possible to improve the corrosion resistance and mechanical properties.

도 1a, 1b 및 1c는 본 발명의 일 실시예에 따른 도금강판 제조방법을 순차적으로 나타내는 개념도이다.
도 2는 본 발명의 일 실시예에 따른 도금강판의 X선 회절 그래프이다.1A, 1B, and 1C are conceptual diagrams sequentially illustrating a method of manufacturing a coated steel sheet according to an embodiment of the present invention.
2 is an X-ray diffraction graph of a coated steel sheet according to an embodiment of the present invention.

이하에서는 도면을 참조하면서 본 발명에 따른 도금 강판 및 이의 제조방법 에 관하여 구체적으로 설명한다. 그러나 본 발명은 이하에서 개시되는 실시예에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 것이며, 단지 본 실시예들은 본 발명의 개시가 완전하도록 하며, 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이다. 도면상에서 동일 부호는 동일한 요소를 지칭한다.Hereinafter, a coated steel sheet according to the present invention and a method for producing the same will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

도면에서 여러 층 및 영역을 명확하게 표현하기 위하여 두께를 확대하여 나타내었다. 그리고 도면에서, 설명의 편의를 위해, 일부 층 및 영역의 두께를 과장되게 나타내었다. 층, 막, 영역, 판 등의 부분이 다른 부분 “상에” 있다고 할 때, 이는 다른 부분 “바로 상에” 있는 경우뿐 아니라 그 중간에 또 다른 부분이 있는 경우도 포함한다.In the drawings, the thickness is enlarged to clearly represent the layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated. When a part of a layer, film, area, plate, etc. is said to be "on" another part, this includes not only being in another part "on the fly" but also having another part in the middle.

도 1a, 1b 및 1c는 본 발명의 일 실시예에 따른 도금강판 제조방법을 순차적으로 나타내는 개념도이다.1A, 1B, and 1C are conceptual diagrams sequentially illustrating a method of manufacturing a coated steel sheet according to an embodiment of the present invention.

도면을 참조하면, 본 발명의 일 실시예에 따른 도금강판 제조방법은 알루미늄층(20)을 코팅하는 단계; 마그네슘층(30)을 코팅하는 단계; 및 마그네슘(30a)이 고용된 알루미늄층(20a)을 형성시키는 단계;를 포함한다.Referring to the drawings, a method of manufacturing a coated steel sheet according to an embodiment of the present invention includes: coating an aluminum layer 20; Coating the magnesium layer (30); And forming an aluminum layer 20a in which magnesium 30a is dissolved.

먼저, 도 1a에 도시된 바와 같이, 강판(10) 위에 알루미늄(Al)층(20)을 코팅한다. 강판(10)은 예컨대 냉연 강판을 사용할 수 있으며, 강판(10) 표면 위에 묻어 있는 방청유와 같은 잔류 오일을 제거하는 탈지 공정을 거친 후, 알코올과 아세톤을 이용하여 강판(10)을 초음파 세척한다. First, as shown in FIG. 1A, an aluminum (Al) layer 20 is coated on a steel sheet 10. The steel sheet 10 may be, for example, a cold-rolled steel sheet. The steel sheet 10 is subjected to a degreasing process for removing residual oil such as rust-preventive oil on the surface of the steel sheet 10, and then the steel sheet 10 is ultrasonically cleaned using alcohol and acetone.

세척한 강판(10)을 진공 챔버에 장입하고 확산 펌프와 로터리 베인 펌프와 같은 진공 펌프를 이용하여 배기하여 진공 챔버 내부의 진공도를 대략 10-6 torr에 이르도록 한다. 진공 배기를 한 후, 아르곤(Ar) 가스과 같은 비활성 가스를 진공 챔버 내부로 주입하여 진공도가 10-2 torr에 이르면 직류 전압 약 800 V를 강판(10)에 인가하여 글로우 방전을 발생시켜 강판 청정을 실시한다. The cleaned steel plate 10 is charged into a vacuum chamber and evacuated using a vacuum pump such as a diffusion pump and rotary vane pump so that the degree of vacuum inside the vacuum chamber reaches approximately 10 -6 torr. After an evacuation is performed, an inert gas such as argon (Ar) gas is injected into the vacuum chamber. When the degree of vacuum reaches 10 -2 torr, a DC voltage of about 800 V is applied to the steel plate 10 to generate a glow discharge, Conduct.

강판 청정 공정이 종료되면, 알루미늄을 강판(10) 표면 위로 증착시켜 알루미늄층(20)을 형성할 수 있는데, 진공 분위기하에서 용융 알루미늄을 증착시켜 강판에 코팅할 수 있다. 고체의 코팅 물질을 가열 증발시켜 기체상으로 변화시키고, 이를 강판상에 코팅(증착)하는 기술은 주로 가열방법에 따라 분류되는데, 예컨대 열 증착법(thermal evaporation), 전자빔 증착법(electron beam evaporation), 전자기 부양 증착법(electro-magnetic levitation evaporation) 등이 있다. 열 증착법은 코팅 물질을 가열 증발시켜 강판에 코팅하는 방법이고, 전자빔 증착법은 도가니 등에 고체의 코팅물질을 장입한 후 전자빔에 의해 코팅 물질을 국부적으로 가열함으로써 코팅물질을 증발시켜 강판에 코팅하는 방법이며, 전자기 부양 증착법은 코팅물질을 포위하는 전자기 코일에 고주파 교류전류의 인가시 발생되는 교류 전자기장을 통하여 코팅 물질을 부양 상태로 가열시킴으로써 도가니에 의한 열 손실을 없이 금속(코팅)증기를 발생시켜 기판에 증착 코팅하는 방법이다. 상기 증착 방법 중 하나를 선택하여 알루미늄층(20)을 증착할 수 있으나, 이는 증착방법의 일 예시일 뿐, 이에 의해 알루미늄을 증착하는 방법이 한정되는 것은 아니다.When the steel sheet cleaning process is completed, aluminum can be deposited on the surface of the steel sheet 10 to form the aluminum layer 20. The molten aluminum can be deposited on the steel sheet in a vacuum atmosphere. Techniques for coating (depositing) a solid coating material on a steel sheet by heating and evaporating the coating material into a vapor phase are mainly classified according to a heating method. For example, thermal evaporation, electron beam evaporation, And electro-magnetic levitation evaporation. In the electron-beam evaporation method, a solid coating material is charged into a crucible or the like, and then the coating material is locally heated by an electron beam to evaporate the coating material to coat the coating material on the steel sheet , The electromagnetic floating deposition method is a method in which a coating material is heated in a floating state through an alternating electromagnetic field generated when a high frequency alternating current is applied to an electromagnetic coil surrounding a coating material to generate metal (coating) vapor without heat loss by the crucible, It is a method of deposition coating. The aluminum layer 20 may be deposited by selecting one of the above deposition methods, but this is merely an example of the deposition method, and thus the method of depositing aluminum is not limited thereto.

알루미늄층(20)을 형성시킨 후, 도 1b에 도시된 바와 같이 알루미늄층(20) 위에 마그네슘(Mg)층(30)을 형성한다. 마그네슘층(30) 역시 알루미늄층(20)과 마찬가지로 진공 증착법을 이용하여 마그네슘을 알루미늄층(20) 표면 위에 형성시킬 수 있다. After the aluminum layer 20 is formed, a magnesium (Mg) layer 30 is formed on the aluminum layer 20 as shown in FIG. 1B. The magnesium layer 30 can also be formed on the surface of the aluminum layer 20 by using a vacuum deposition method as in the case of the aluminum layer 20.

알루미늄층(20)과 마그네슘층(30)을 차례로 코팅한 후, 알루미늄층(20) 및 마그네슘층(30)이 코팅된 강판(10)을 열처리하여, 도 1c에 도시된 바와 같이 마그네슘(30a)가 고용된 알루미늄층(20a)를 형성시킨다. 먼저, 알루미늄층(20) 및 마그네슘층(30)이 코팅된 강판을 진공 챔버에서 꺼내어 열처리를 실시할 수 있는 가열로에 장입한다. 가열로에서 알루미늄층(20) 및 마그네슘층(30)이 코팅된 강판(10)을 가열하여 소정 온도에서 열처리하면, 마그네슘층(30)에 있던 마그네슘 원자(30a)들이 알루미늄층(20)에 고용되기 시작하면서, 마그네슘(30a)이 고용된 알루미늄층(20a)이 형성된다.After coating the aluminum layer 20 and the magnesium layer 30 in sequence, the aluminum layer 20 and the steel sheet 10 coated with the magnesium layer 30 are heat-treated, as shown in Figure 1c magnesium 30a Forms a solid solution aluminum layer 20a. First, a steel sheet coated with the aluminum layer 20 and the magnesium layer 30 is taken out of the vacuum chamber and charged into a heating furnace capable of performing heat treatment. When the steel sheet 10 coated with the aluminum layer 20 and the magnesium layer 30 is heated in a heating furnace and heat-treated at a predetermined temperature, the magnesium atoms 30a in the magnesium layer 30 are dissolved in the aluminum layer 20. As it begins to be formed, an aluminum layer 20a in which magnesium 30a is dissolved is formed.

마그네슘이 알루미늄과 비교하여 함유량이 낮도록, 알루미늄층(20)을 마그네슘층(30)보다 두껍게 형성하는 것이 바람직하다. 더욱 바람직하게는 알루미늄층(20)과 마그네슘층(30)의 두께 비는 4 : 1 이상으로 할 수 있다. 알루미늄층(20)과 마그네슘층(30)의 두께 비가 4 : 1 미만인 경우에는 마그네슘이 과다하여 알루미늄-마그네슘 합금층이 형성될 수 있기 때문이다. 또한 마그네슘의 고용률 대비 효과를 위해 알루미늄층(20)과 마그네슘층(30)의 두께 비를 5 : 1 이하로 할 수 있다. It is preferable to form the aluminum layer 20 thicker than the magnesium layer 30 so that the content of magnesium is lower than that of aluminum. More preferably, the thickness ratio of the aluminum layer 20 and the magnesium layer 30 may be 4: 1 or more. This is because when the thickness ratio of the aluminum layer 20 and the magnesium layer 30 is less than 4: 1, magnesium may be excessive and an aluminum-magnesium alloy layer may be formed. In addition, the thickness ratio of the aluminum layer 20 and the magnesium layer 30 may be 5: 1 or less for the effect of the solid solution ratio of magnesium.

열처리는 100 ~ 400 ℃에서 행하는 것이 바람직한데, 열처리를 100 ℃ 미만의 온도에서 행하는 경우에는 마그네슘층(30)의 마그네슘(30a)들이 알루미늄층(20)에 고용되는 효과가 미미하며, 열처리를 400 ℃를 초과하는 온도에서 행하는 경우에는 알루미늄 또는 마그네슘이 용융되어 증발할 수 있고 알루미늄과 마그네슘이 반응하여 알루미늄-마그네슘 합금층을 형성할 수 있기 때문이다. 또한 열처리는 상기 온도 범위 내에서 1 ~ 20분 동안 행하는 것이 바람직한데, 1분 미만으로 열처리하는 경우 마그네슘층(30)의 마그네슘(30a)들이 알루미늄층(20)에 고용되는 효과가 미미하며, 20분을 초과하는 경우에는 마그네슘(30a)이 고용된 알루미늄층(20a)에 크랙이 발생하여 마그네슘(30a)이 고용된 알루미늄층(20a)과 강판(10) 사이의 밀착성이 떨어지기 때문이다.Heat treatment is preferably carried out at 100 ~ 400 ℃, when the heat treatment is performed at a temperature of less than 100 ℃, the effect that the magnesium (30a) of the magnesium layer 30 is dissolved in the aluminum layer 20 is insignificant, the heat treatment 400 This is because when it is performed at a temperature exceeding ℃, aluminum or magnesium can be melted and evaporated, and aluminum and magnesium can react to form an aluminum-magnesium alloy layer. In addition, the heat treatment is preferably performed for 1 to 20 minutes within the above temperature range, when the heat treatment is less than 1 minute, the effect that the magnesium (30a) of the magnesium layer 30 is dissolved in the aluminum layer 20 is insignificant, 20 This is because if the amount exceeds minutes, cracks occur in the aluminum layer 20a in which the magnesium 30a is dissolved, resulting in poor adhesion between the aluminum layer 20a in which the magnesium 30a is dissolved and the steel sheet 10.

상기에서 설명한 바와 같이, 본 발명의 일 실시예에 따른 제조방법에 의해 제조된 도금 강판은 종래의 용융 도금이나 전기 도금으로 코팅층을 형성하는 경우보다 균일하게 마그네슘(30a)이 고용된 알루미늄층(20a)이 형성되어 강판과 코팅층 간의 밀착력을 향상되며, 내식성 및 기계적 특성이 향상된다.As described above, the plated steel sheet produced by the manufacturing method according to an embodiment of the present invention is an aluminum layer 20a having a solid solution of magnesium 30a uniformly formed when forming a coating layer by conventional hot dip plating or electroplating. ) Is formed to improve the adhesion between the steel sheet and the coating layer, and the corrosion resistance and mechanical properties are improved.

도 2는 본 발명의 일 실시예에 따른 도금강판의 X선 회절 그래프이다. 2 is an X-ray diffraction graph of a coated steel sheet according to an embodiment of the present invention.

본 발명의 일 실시예에 따른 제조방법에 의해 제조된 도금 강판을 X선 회절장치를 이용하여 X선 회절 그래프를 얻었다. 여기에서는 알루미늄층(20) 및 마그네슘층(30)을 각각 5 μm, 1 μm의 두께로 전자빔 증착기를 이용한 진공 증착을 통해 강판(10) 위에 형성시키고, 알루미늄층(20) 및 마그네슘층(30)이 형성된 강판(10)을 400 ℃에서 10분간 열처리하였는데, 이는 본 발명의 일 실시예일 뿐, 본 발명의 범위가 이것으로 한정되는 것은 아니다.An X-ray diffraction graph was obtained by using the X-ray diffraction apparatus of the coated steel sheet produced by the manufacturing method according to one embodiment of the present invention. Here, the aluminum layer 20 and the magnesium layer 30 are formed on the steel sheet 10 by vacuum deposition using an electron beam evaporator to a thickness of 5 μm and 1 μm, respectively, and the aluminum layer 20 and the magnesium layer 30 are formed. The formed steel sheet 10 was heat-treated at 400 ° C. for 10 minutes, which is only an embodiment of the present invention, and the scope of the present invention is not limited thereto.

본 발명의 일 실시예에 따른 제조방법에 의해 제조된 도금 강판은 도 2에 도시된 바와 같이, 알루미늄-마그네슘 합금층 또는 알루미늄-철 합금층과 같은 합금이 형성되지 않은 것을 알 수 있다.As shown in FIG. 2, the plated steel sheet manufactured by the manufacturing method according to the exemplary embodiment of the present invention may not be formed with an alloy such as an aluminum-magnesium alloy layer or an aluminum-iron alloy layer.

본 실시예 및 본 명세서에 첨부된 도면은 본 발명에 포함되는 기술적 사상의 일부를 명확하게 나타내고 있는 것에 불과하며, 본 발명의 명세서 및 도면에 포함된 기술적 사상의 범위 내에서 당업자가 용이하게 유추할 수 있는 다양한 변형 예와 구체적인 실시 예는 모두 본 발명의 권리범위에 포함되는 것이 자명하다고 할 것이다.The embodiments and drawings attached to this specification are merely to clearly show some of the technical ideas included in the present invention, and can be easily inferred by those skilled in the art within the scope of the technical ideas included in the specification and drawings of the present invention. Various modifications and specific embodiments that can be made will be apparent to be included in the scope of the invention.

10 : 강판
20 : 알루미늄층
20a : 마그네슘이 고용된 알루미늄층
30 : 마그네슘층
30a : 마그네슘10: Steel plate
20: Aluminum layer
20a: aluminum layer containing magnesium
30: magnesium layer
30a: magnesium

Claims (7)

강판 위에 알루미늄층을 코팅하는 단계;
상기 알루미늄층에 마그네슘층을 코팅하는 단계; 및
상기 알루미늄층 및 마그네슘층이 코팅된 강판을 열처리하여, 강판 위에 마그네슘이 고용된 알루미늄층을 형성시키는 단계;
를 포함하는 도금 강판의 제조방법.Coating an aluminum layer on the steel sheet;
Coating the aluminum layer with a magnesium layer; And
Heat-treating the steel sheet coated with the aluminum layer and the magnesium layer to form an aluminum layer in which magnesium is dissolved in the steel sheet;
Method for producing a coated steel sheet comprising a. 제1항에 있어서,
상기 알루미늄층 및 마그네슘 층은 진공 상태에서 증착에 의해 형성되는 도금 강판의 제조방법.The method of claim 1,
The aluminum layer and the magnesium layer is a method of manufacturing a plated steel sheet formed by vapor deposition in a vacuum state. 제1항에 있어서,
알루미늄층이 마그네슘층보다 더 두껍게 형성되는 도금 강판의 제조방법.The method of claim 1,
Method for producing a plated steel sheet in which the aluminum layer is formed thicker than the magnesium layer. 제3항에 있어서,
상기 알루미늄층과 마그네슘층의 두께 비는 4 : 1 이상인 도금 강판의 제조방법.The method of claim 3,
The thickness ratio of the aluminum layer and the magnesium layer is 4: 1 or more manufacturing method of the coated steel sheet. 제1항에 있어서,
상기 열처리는 100 ~ 400 ℃에서 행하는 도금 강판의 제조방법.The method of claim 1,
The heat treatment is a method for producing a plated steel sheet carried out at 100 ~ 400 ℃. 제3항에 있어서,
상기 열처리는 5 ~ 20분 동안 행하는 도금 강판의 제조방법.The method of claim 3,
Wherein the heat treatment is performed for 5 to 20 minutes. 제1항 내지 제6항 중 어느 한 항의 제조방법으로 제조되는 도금 강판.
Plated steel sheet produced by the method of any one of claims 1 to 6.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020525645A (en) * 2017-06-27 2020-08-27 ポスコＰｏｓｃｏ Alloy coated steel sheet and method for producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020525645A (en) * 2017-06-27 2020-08-27 ポスコＰｏｓｃｏ Alloy coated steel sheet and method for producing the same
US11608556B2 (en) 2017-06-27 2023-03-21 Posco Holdings Inc. Alloy-coated steel sheet and manufacturing method thereof

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