KR960005025B1 - Method for manufacturing an electroplating steel plate with a fine surface - Google Patents

Method for manufacturing an electroplating steel plate with a fine surface Download PDF

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KR960005025B1
KR960005025B1 KR1019930030269A KR930030269A KR960005025B1 KR 960005025 B1 KR960005025 B1 KR 960005025B1 KR 1019930030269 A KR1019930030269 A KR 1019930030269A KR 930030269 A KR930030269 A KR 930030269A KR 960005025 B1 KR960005025 B1 KR 960005025B1
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South Korea
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plating
steel sheet
solution
plating solution
steel plate
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KR1019930030269A
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Korean (ko)
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KR950018606A (en
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김명수
안덕수
박성국
노재원
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포항종합제철주식회사
김종진
재단법인산업과학기술연구소
신창식
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Priority to KR1019930030269A priority Critical patent/KR960005025B1/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C25D7/0635—In radial cells

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

The electroplated steel sheet is produced by spraying an it air or gas with the equipment of continuous and radial type. The equipment includes plating tanks(1,2), plating solutions(3,4), conductor rolls(5,6), anodes(7,8), deflector rolls(10,11), and spray nozzles(12,13). The spray nozzle having the width of steel sheets(9) is located as follows : above the surface of plating solution. The optimum conditions of spraying process are as follows : (a)spray pressure is 0.2 to 30kgf/cm2, and (b)spray angle is 30 to 80 deg. in the opposite direction to movement direction of steel sheet. This process prevents surface contamination of plated sheet by sediment in plating solution, surface etching of plating layer by plating solution, and linear flow pattern on the surface of sheet. The disclosed steel sheet has good coating adherency and smooth surface.

Description

표면이 미려한 전기도금강판의 제조방법Manufacturing method of electroplated steel sheet with beautiful surface

제1도는 본 발명이 적용된 레이디얼형 전기도금설비의 개략도.1 is a schematic diagram of a radial electroplating apparatus to which the present invention is applied.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1, 2 : 도금조 3, 4 : 도금용액1, 2: plating bath 3, 4: plating solution

5, 6 : 전도롤 7, 8 : 양극5, 6: conductive roll 7, 8: anode

9 : 강판 10, 11 : 디플렉터롤9: steel sheet 10, 11: deflector roll

12, 13 : 분사노즐12, 13: injection nozzle

본 발명은 레이디얼(radial)형 전기도금설비로 도금하는데 있어서, 도금용액중의 침전물에 의한 도금강판의 표면 오염을 방지하고 도금액에 의한 도금층의 표면 엣칭(etching)을 막아 강판표면에 선형의 흐름무늬를 방지하므로서 표면이 깨끗한 도금강판을 제조할 수 있는 전기도금강판의 제조방법에 관한 것이다.In the present invention, in the plating with a radial electroplating apparatus, the surface of the plated steel sheet is prevented from being precipitated by the deposit in the plating solution, and the surface etching of the plated layer by the plating solution is prevented, thereby providing a linear flow to the surface of the steel sheet. It relates to a method for producing an electroplated steel sheet that can produce a plated steel sheet with a clean surface while preventing the pattern.

연속 전기도금설비에는 전해조 통과시 강판의 진행 방향에 따라 주로 레이디얼형, 수직형 및 수평형이 있다. 레이디얼형 도금설비는 중앙의 큰 전도롤(conductor roll)에 강판이 감기게 하여 외면측과 원주상으로 설계한 전극과의 사이에 도금액이 흐르게 하여 도금하는 방식으로서, 수직형과 수평형 설비에 비해 극간거리가 짧아 고전류밀도 및 고속도금에 유리하고 또한 편면도금 및 양면에 도금층의 종류가 다른 이종도금이 가능하다. 레이디얼형 도금설비는 일반적으로 강판이 여러개의 도금조를 통과하면서 각 도금조마다 일정한 비율만큼씩 도금이 된후 모든 도금조를 통과하면 최종목표의 도금이 된다. 각 도금조에는 통전을 해줄 수 있는 전도롤과 강판의 진행방향을 바꿔주는 디플렉터롤(deflector roll)이 있으며 강판은 전도롤의 외면하단부에 감겨있는 상태로 도금용액에 잠기어 도금이 된후 도금용액 밖으로 나와 디플렉터롤에 의해 강판 진행 방향이 바뀌게 되어 이와 같은 과정이 도금조의 갯수만큼 반복된 후 최종 도금이 완료된다.Continuous electroplating facilities are mainly radial, vertical and horizontal type depending on the direction of steel sheet passing through the electrolytic cell. Radial plating equipment is a method in which a plating solution flows between the outer surface side and the circumferentially designed electrode by plating a steel plate on a large conductor roll in the center. The short distance between the poles is advantageous for high current density and high speed plating, and it is possible to carry out heteroplating with different kinds of plating layers on one side plating and both sides. Radial plating equipment is generally plated by a certain ratio for each plating bath while passing through several plating baths, and then passes through all the plating baths to become the final target plating. Each plating tank has a conduction roll that can conduct electricity and a deflector roll that changes the direction of the steel sheet.The steel plate is wrapped in the plating solution in the state of being wound on the lower end of the outer surface of the conduction roll and then plated out of the plating solution. The direction of the steel sheet is changed by the deflector roll and the process is repeated by the number of plating baths, and then the final plating is completed.

일반적으로 도금용액중에는 도금에 필요한 금속이온 혹은 비금속 이온들이 많이 존재하며, 이들 이온들은 특정조건에서 예를들면, pH의 상승, 온도의 하락, 용액의 고농도화등에 의해 침전물을 생성하여 용액중에 부유하게 되고 또한 작업장의 흙먼지등이 용액안으로 혼입되며 가용성 양극을 사용할 경우 양극의 부동태 피막이 형성된 후 흐르는 도금용액에 떨어져나와 용액중에 존재하게 된다. 이러한 침전물이나 이물질등은 강판이 용액속에 잠기어 도금이 된후 용액을 빠져 나올때 강판표면에 묻어서 강판이 디플렉터롤에 감길때를 및 강판에 압착되고 강판에 압착된 미소한 오염물질위에 이어지는 도금조에서 도금이 되므로서 도금밀착성열화를 야기시키고 강판표면을 오염시키는 원인이 된다. 또한 디플렉터롤은 도금시간이 증가함에 따라 오염이 증가되어 롤에 묻어있는 오염물질이 강판에 압착되어 도금밀착성열화 및 강판 표면 오염을 증가시킨다. 또한 강판이 전해액을 빠져나와 디플렉터롤에 감길때까지는 일정한 간격이 있기 때문에 이 사이에서 강판에 묻어 있는 전해액은 강판의 진행방향과 반대방향으로 흐르게 되고 전해액은 pH가 낮기 때문에 강판표면을 엣칭시켜 도금강판에 도금액 흐름방향으로 무늬가 생기게 되며 이러한 무늬는 도금용액의 pH가 낮을수록 선명하게 보이게 된다.In general, there are many metal ions or non-metal ions necessary for plating in the plating solution, and these ions are suspended in the solution by forming a precipitate by, for example, raising the pH, decreasing the temperature, or increasing the concentration of the solution. In addition, dust and dirt in the workplace are mixed into the solution. When a soluble anode is used, the passivation film of the anode is formed and then falls into the flowing plating solution and is present in the solution. These deposits and foreign matters are plated in the plating bath that is immersed in the solution and plated on the surface of the steel sheet when it is immersed in the solution. This causes plating adhesion deterioration and contaminates the steel plate surface. In addition, the deflector roll increases contamination with increasing plating time, and contaminants on the roll are pressed onto the steel sheet to increase plating adhesion degradation and steel plate surface contamination. In addition, since there is a certain interval until the steel sheet exits the electrolyte and is wound on the deflector roll, the electrolyte buried in the steel plate flows in the opposite direction to the steel plate traveling direction. A pattern is formed in the flow direction of the plating solution, and the pattern is clearly seen as the pH of the plating solution is low.

종래에는 용액중에 있는 오염물질이 디플렉터롤과 강판에 압착되는 것을 방지하기 위해 디플렉터롤의 아래에 롤과는 닿지 않게 드립팬(drip pan)을 설치하여 팬 안에 여과된 도금용액이나 물을 채워 롤을 닦아주었다. 그러나 이 방법은 단순하게 맑은 용액으로 롤을 적셔주기 때문에 오염물질을 줄여주는 효과는 있으나 압착된 오염물질을 떼어낼 수는 없으며, 또한 물을 사용할 경우 물이 롤이나 강판에 묻어서 도금조로 흘러들어가 도금용액의 농도를 묽게 하는 단점이 있으며, 맑은 용액이나 물을 사용하더라도 도금강판의 엣칭되는 문제점은 해결할 수 없다. 따라서 본 발명은 도금용액이 강판에 묻어서 흐르는 것을 방지하고 강판이 도금용액에서 빠져나올때 오염물질이 묻어나오는 것을 방지하기 위해 도금용액에서 강판이 빠져나오는 부위의 직상에 고압의 공기 혹은 가스를 불어주어 이들 기체의 압력에 의해 도금용액 및 오염물질이 떨어져 나가게 하므로써 강판표면이 미려한 도금강판을 제조하고자 하는데, 그 목적이 있다.Conventionally, in order to prevent the contaminants in the solution from being pressed onto the deflector roll and the steel sheet, a drip pan is installed below the deflector roll so as not to come into contact with the roll to fill the roll with the plating solution or water filtered therein. I wiped it off. However, this method reduces the pollutants by simply soaking the rolls with a clear solution, but it is not possible to remove the contaminated contaminants. There is a disadvantage in diluting the concentration of the solution, even if using a clear solution or water can not solve the problem of etching of the plated steel sheet. Therefore, in order to prevent the plating solution from flowing through the steel plate and to prevent contaminants from coming out when the steel plate leaves the plating solution, the present invention blows high-pressure air or gas directly onto the portion of the steel plate from the plating solution. The purpose of the present invention is to manufacture a plated steel sheet having a beautiful surface of the steel sheet by causing the plating solution and contaminants to fall off by the pressure of the gas.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

본 발명은 레이디얼형 전기도금설비로 전기도금강판을 제조하는데 있어서, 도금용액으로부터 강판이 빠져 나오는 부위의 직상에 강판 폭만큼의 노즐을 설치하여 공기 혹은 가스를 0.2∼30kg/cm2의 압력으로 강판의 진행방향과 반대방향에서 30∼80°의 분사각도로 분사하여 도금용액 및 오염물질이 떨어져 나가게 하므로써 표면이 미려한 전기도금강판을 제조하는 방법에 관한 것이다.In the present invention, in manufacturing an electroplated steel sheet using a radial electroplating equipment, a steel plate width nozzle is installed immediately above a portion where the steel sheet escapes from the plating solution to produce air or gas at a pressure of 0.2 to 30 kg / cm 2 . The present invention relates to a method of manufacturing an electroplated steel sheet having a beautiful surface by spraying at an injection angle of 30 to 80 ° in a direction opposite to the traveling direction of the plating solution and contaminants.

이하, 본 발명을 제1도를 통해 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to FIG. 1.

제1도에 나타난 바와 같이, 레이디얼형 도금설비로 도금하는 공정에서는 일반적으로 강판(9)이 여러개의 도금조(1, 2)를 통과하면서 각 도금조마다 일정한 비율만큼씩 도금이 된후 모든 도금조를 통과하면 최종목표의 도금이 된다. 각 도금조에는 도금시 도금용액(3, 4)에 잠겨있는 양극(7, 8)과 통전을 해줄 수 있는 전도롤 (5, 6)과 강판의 진행방향을 바꿔주는 디플렉터롤(deflector roll)(10, 11)이 있으며, 강판(9)은 전도롤(5, 6)의 외면하단부에 감겨있는 상태로 도금용액(3, 4)에 잠기어 도금이 된후 도금용액 밖으로 나와 디플렉터롤(10, 11)에 의해 강판 진행방향이 바뀌게 되며 이와 같은 과정이 도금조의 갯수만큼 반복된 후 최종 도금이 완료된다.As shown in FIG. 1, in the process of plating with a radial plating facility, the steel plate 9 is generally plated by a predetermined ratio for each plating bath while passing through several plating baths 1 and 2, and then all plating baths. Passing will be the plating of the final target. Each plating bath has anodes (7, 8) submerged in the plating solution (3, 4), conduction rolls (5, 6) for conducting electricity, and deflector rolls for changing the direction of the steel sheet. 10, 11, and the steel sheet 9 is immersed in the plating solution (3, 4) in the state wound around the lower surface of the conductive roll (5, 6) and then plated out the deflector roll (10, 11) The direction of steel sheet is changed by) and the final plating is completed after this process is repeated by the number of plating baths.

이와 같이 강판(9)이 각 도금조(1, 2)를 통과하면서 연속적으로 도금이 진행될때, 강판이 각 도금조의 도금용액을 빠져나와 디플렉터롤(10, 11)에 감길때까지는 일정한 공간이 있으며 이 공간에서 강판에 묻은 도금 용액과 오염물질의 일부는 중력에 의해 아래로 흐르며 일부는 강판에 묻어서 디플렉터롤에서 압착되게 된다. 그러나, 본 발명에서는 각 도금조에서 강판이 도금용액에서 빠져나오는 쪽의 도금용액 직상에 분사노즐(12, 13)을 설치하고 이 노즐을 통해 공기 혹은 가스를 0.2-30kgf/cm2의 압력으로 강판 진행방향과 반대방향으로 30°∼80°각도로 분사하므로써, 강판이 용액중에서 빠져나올때 강판에 묻은 도금용액과 오염물질이 떨어져나가게 하여 도금용액에 의한 강판의 엣칭을 방지하고 오염물질이 강판 및 디플렉터롤에 압착되는 것을 방지하여 표면이 미려한 도금강판을 제조할 수 있게 된다.As the steel plate 9 passes through the plating baths 1 and 2 in this manner, the plating proceeds continuously, and there is a constant space until the steel plate exits the plating solution of each plating bath and is wound on the deflector rolls 10 and 11. In this space, some of the plating solution and contaminants on the steel sheet flow down by gravity, and some of them are pressed onto the deflector rolls. However, in the present invention, the spray nozzles 12 and 13 are installed directly on the plating solution on the side where the steel sheet exits from the plating solution in each plating bath, and the air or gas is pressed through the nozzle at a pressure of 0.2-30 kgf / cm 2 . By spraying at an angle of 30 ° to 80 ° in the direction opposite to the advancing direction, the plating solution and contaminants on the steel sheet will fall off when the steel sheet comes out of the solution, preventing the steel sheet from being etched by the plating solution, It is possible to manufacture a plated steel sheet having a beautiful surface by preventing the compression on the roll.

노즐을 통해 공기 혹은 가스를 분사할시 분사압력이 0.2kgf/cm2이하인 경우에는 분사압력이 너무 낮아 도금용액 및 오염물질을 충분히 떨어져 나가게 하기 어렵고, 30kgf/cm2이상인 경우에는 분사압이 도금조에 있는 도금용액에까지 미치게 되어 도금용액이 비산하게 되므로, 상기 분사압력은 0.2-30kgf/cm2으로 제안하는 것이 바람직하다.When spraying air or gas through the nozzle, if the spray pressure is 0.2kgf / cm 2 or less, the spraying pressure is too low to sufficiently separate the plating solution and contaminants. If the spray pressure is 30kgf / cm 2 or more, the spray pressure is applied to the plating tank. Since it extends to the plating solution, the plating solution is scattered, it is preferable to propose the injection pressure of 0.2-30kgf / cm 2 .

또한, 상기 노즐 분사각이 30°이하인 경우에는 가스의 진행방향이 도금조의 용액에 직접 영향을 미쳐 용액이 비산되며, 80°이상인 경우에는 강판에 묻은 용액이 강판 진행방향으로 묻어 올라가므로, 상기 노즐분사각은 30-80°로 제한하는 것이 바람직하다.In addition, when the nozzle injection angle is 30 ° or less, the direction of the gas directly affects the solution of the plating bath and the solution is scattered, when the nozzle is more than 80 °, the solution on the steel plate is buried in the direction of the steel sheet, so the nozzle The spray angle is preferably limited to 30-80 °.

이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

[실시예]EXAMPLE

하기 표 1에서와 같이 통상적인 아연-철 합금도금강판의 제조조건의 도금용액 및 도금조건에서 도금실시하고, 도금강판 표면의 용액 흐름 무늬 및 도금밀착성을 조사하고, 그 결과를 하기 표 2에 나타내었다.As shown in Table 1, the plating was carried out under the plating solution and the plating conditions of the conventional zinc-iron alloy plated steel sheet, and the solution flow pattern and plating adhesion on the surface of the plated steel sheet were investigated, and the results are shown in Table 2 below. It was.

이때, 하기 표 2와 같은 분사압력조건으로 제1도에서와 같이 설치된 노즐을 통해 도금용액에서 나온 강판에 가스를 분사시켰다. 이때, 노즐의 분사각도는 45°이었다.At this time, the gas was injected into the steel sheet from the plating solution through a nozzle installed as shown in FIG. 1 under the injection pressure conditions shown in Table 2 below. At this time, the spray angle of the nozzle was 45 degrees.

하기 표 2에서, 흐름무늬는 육안으로 관찰한 것이고, 도금밀착성은 도금강판 표면에 테이프를 부착시킨 후 테이프를 뜯어내었을때 도금피막이 테이프에 묻어나오는 정도를 평가한 것이다.In Table 2, the flow pattern is visually observed, the plating adhesion is to evaluate the degree to which the coating film is buried on the tape when the tape is peeled off after attaching the tape to the plated steel sheet surface.

[표 1]TABLE 1

[표 2]TABLE 2

* 흐름무늬 : ◎ 없음, △ 희미, × 선명* Flow Pattern: ◎ None, △ Faint, × Vivid

** 도금밀착성 : 1 우수 < ----- > 불량 4** Plating Adhesion: 1 Excellent <-----> Poor 4

상기 표 2에 나타난 바와 같이, 노즐의 분사 압력을 0.2kgf/cm2한 발명예(1)의 경우에는 도금강판 표면의 용액 흐름무늬는 희미하고, 도금밀착성은 우수하며, 분사압력을 1kgf/cm2으로 한 발명예(2)의 경우에는 도금강판에 용액 흐름무늬는 없고, 도금밀착성도 양호하며, 분사압력을 10kgf/cm2이상 30kgf/cm2이하로 한 발명예(3-5)의 경우에는 흐름무늬가 전혀 없고, 도금밀착성도 우수함을 알 수 있다.As shown in Table 2, in the invention example (1) in which the injection pressure of the nozzle is 0.2kgf / cm 2 , the solution flow pattern on the surface of the plated steel sheet is faint, the plating adhesion is excellent, and the injection pressure is 1kgf / cm. In the case of Inventive Example (2) of 2, there is no solution flow pattern on the plated steel plate, the plating adhesion is also good, and the Invention Example (3-5) in which the spray pressure is 10 kgf / cm 2 or more and 30 kgf / cm 2 or less. There is no flow pattern at all, and it can be seen that the plating adhesion is excellent.

한편, 비교예(1)은 종래의 방법에 의해 도금강판을 제조한 경우로서 도금강판에 도금용액의 흐름무늬가 선명하고 도금밀착성도 불량하며, 본 발명에서 한정한 분사압력 미만의 압력으로 분사한 비교예(2, 3)의 경우에는 흐름무늬가 선명하고 도금밀착성도 불량함을 알 수 있다.On the other hand, Comparative Example (1) is a case where the plated steel sheet is manufactured by a conventional method, the flow pattern of the plating solution on the plated steel plate is clear, the plating adhesion is poor, and sprayed at a pressure less than the injection pressure defined in the present invention In Comparative Example (2, 3) it can be seen that the flow pattern is clear and the plating adhesion is poor.

상술한 바와 같이, 본 발명은 강판이 도금용액에서 빠져나오는 부위의 직상에 노즐을 설치하고 그 노즐을 통해 공기 혹은 가스를 0.2-30kgf/cm2의 압력으로 강판의 진행방향과 반대방향의 일정한 각도로 분사하며 강판에 묻어 있는 도금용액과 오염물질이 떨어져 나가므로써, 도금용액에 의한 강판의 표면엣칭을 방지하고 오염물질이 강판표면에 압착되는 것을 방지하여 표면이 미려한 도금강판을 제조할 수 있는 효과가 있는 것이다.As described above, in the present invention, a nozzle is installed immediately above a portion where the steel sheet escapes from the plating solution, and a constant angle in the opposite direction to the traveling direction of the steel sheet at a pressure of 0.2-30 kgf / cm 2 through air or gas through the nozzle. It is possible to manufacture the plated steel plate with beautiful surface by preventing the surface etching of the steel plate by the plating solution and preventing the contaminant from being pressed on the surface of the steel plate by spraying the plated solution and contaminants off the steel plate. There is.

Claims (1)

레이디얼형 전기도금설비로 전기도금강판을 제조하는데 있어서, 도금용액으로부터 강판이 빠져나오는 부위의 직상에 강판 폭만큼의 노즐을 설치하여 공기 혹은 가스를 0.2∼30kgf/cm2분사압력으로 강판의 진행방향과 반대방향에서 30-80°의 분사각도로 분사하는 것을 특징으로 하는 표면이 미려한 전기도금강판의 제조방법.In the production of electroplated steel sheet by radial electroplating equipment, the steel plate width is installed just above the part where the steel plate escapes from the plating solution, and the air or gas is discharged at a pressure of 0.2 to 30 kgf / cm 2. The method of manufacturing an electroplated steel sheet with a beautiful surface, characterized in that the spraying at an injection angle of 30-80 ° in the opposite direction.
KR1019930030269A 1993-12-28 1993-12-28 Method for manufacturing an electroplating steel plate with a fine surface KR960005025B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023038245A1 (en) * 2021-09-10 2023-03-16 삼성전자주식회사 Refrigerator

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