KR100569335B1 - Surface texturing method for cold steel sheet - Google Patents
Surface texturing method for cold steel sheet Download PDFInfo
- Publication number
- KR100569335B1 KR100569335B1 KR1019990067652A KR19990067652A KR100569335B1 KR 100569335 B1 KR100569335 B1 KR 100569335B1 KR 1019990067652 A KR1019990067652 A KR 1019990067652A KR 19990067652 A KR19990067652 A KR 19990067652A KR 100569335 B1 KR100569335 B1 KR 100569335B1
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- South Korea
- Prior art keywords
- steel sheet
- rolled steel
- cold rolled
- finishing
- seconds
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/06—Etching of iron or steel
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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)
- Mechanical Engineering (AREA)
- ing And Chemical Polishing (AREA)
- Metal Rolling (AREA)
Abstract
본 발명은 냉연강판의 표면 마무리 방법에 관한 것으로, 압연 공정을 끝내고 표면 마무리 공정을 진행함에 있어서, 냉연 강판에 미세 전압을 가해 그 표면을 녹임으로써, 초기 발청 성능을 향상시킬 수 있게 한 것을 특징으로 하는 냉연강판의 표면 마무리 방법을 제공하는데 그 목적이 있는 것이다.The present invention relates to a surface finishing method of a cold rolled steel sheet, in the course of finishing the rolling process and proceeding with the surface finishing process, by applying a fine voltage to the cold rolled steel sheet to melt the surface, it is possible to improve the initial rust performance The purpose is to provide a surface finishing method of the cold rolled steel sheet.
냉연강판, 표면 마무리Cold rolled steel, surface finish
Description
본 발명은 냉연강판의 표면 마무리 방법에 관한 것으로서, 더욱 상세하게는 압연공정이 끝난 냉연강판의 표면에 미세 전압을 인가하여 강판의 표면을 녹여 초기발청 성능을 향상시킬 수 있는 냉연강판의 표면 마무리 방법에 관한 것이다.The present invention relates to a surface finishing method of a cold rolled steel sheet, and more particularly, to a surface finishing method of a cold rolled steel sheet which can improve the initial rust performance by melting a surface of a steel sheet by applying a fine voltage to the surface of a cold rolled steel sheet after a rolling process. It is about.
일반적으로 냉연강판의 표면 마무리는 제조공정과 조도에 따라 구분하게 되며, 특히 냉연강판의 제조공정 중에서 마무리 단계인 압연공정에서 압연용 롤러의 표면 거칠기에 따라 결정된다.In general, the surface finish of the cold rolled steel sheet is classified according to the manufacturing process and roughness, in particular, it is determined according to the surface roughness of the rolling roller in the rolling process, which is the finishing step in the manufacturing process of the cold rolled steel sheet.
이때 상기 압연용 롤러의 표면 거칠기에 따라 표면 마무리는 브라이트(bright)와 덜(dull)로 구분하고 있다.At this time, the surface finish according to the surface roughness of the roller for rolling is divided into bright (bright) and (dull).
표면 마무리가 브라이트인 경우 제조된 강판의 표면 조도는 Ra∼0.3 수준이며, 덜인 경우에는 강판의 표면 조도가 Ra0.6∼1.8 범위에 있게 된다.If the surface finish is bright, the surface roughness of the produced steel sheet is Ra ~ 0.3 level, if less, the surface roughness of the steel sheet is in the range of Ra 0.6 ~ 1.8.
이러한 표면 마무리는 강판의 내식성능에는 어느 정도 영향을 미치게 되나 그 정도가 미미하여, 도장 등의 후처리 과정에서 사용되는 도막물질(밀착력, 광택 도 등)에 주로 영향을 미치기 때문에 이 도막물질에 따라 표면 마무리 정도를 결정하게 된다.This surface finish affects the corrosion resistance of the steel sheet to a certain extent, but the degree is minimal, and mainly affects the coating material (adhesiveness, gloss, etc.) used in the post-treatment process such as coating. The degree of finishing will be determined.
본 발명은 압연 공정을 끝내고 표면 마무리 공정을 진행함에 있어서, 냉연 강판에 미세 전압을 가해 그 표면을 녹임으로써, 초기 발청 성능을 향상시킬 수 있게 한 것을 특징으로 하는 냉연강판의 표면 마무리 방법을 제공하는데 그 목적이 있는 것이다.
The present invention provides a surface finishing method of a cold rolled steel sheet, characterized in that the initial rolling performance can be improved by applying a fine voltage to the cold rolled steel sheet to melt the surface in finishing the rolling process and proceeding with the surface finishing process. The purpose is.
이를 좀더 상세하게 설명하면 다음과 같다.This will be described in more detail as follows.
본 발명은 냉연강판을 제조함에 있어서, 표면 마무리 공정에서 냉연강판의 표면에 일정한 미세 전압을 소정의 시간만큼 걸어 냉연강판의 표면을 일정한 두께로 녹여 줌으로써, 초기 발청 속도를 늦출 수 있고, 이에 따라 냉연강판의 내식성을 향상시킬 수 있도록 한 것이다.In the present invention, in manufacturing a cold rolled steel sheet, by applying a predetermined minute voltage to the surface of the cold rolled steel sheet in a surface finishing process for a predetermined time to melt the surface of the cold rolled steel sheet to a certain thickness, it is possible to slow the initial rusting rate, accordingly It is to improve the corrosion resistance of the steel sheet.
이를 위하여, 압연 공정이 끝난 냉연강판을 전류밀도 102∼104㎂/㎠ 범위로 전해 에칭함으로써, 초기 발청 속도를 현저히 감소시킬 수 있고, 따라서 냉연강판의 내식성을 크게 향상시킬 수 있다.For this purpose, by electrolytically etching the cold rolled steel sheet after the rolling process in a current density of 10 2 to 10 4 Pa / cm 2, the initial rusting rate can be significantly reduced, and thus the corrosion resistance of the cold rolled steel sheet can be greatly improved.
여기서, 전해 에칭은 강판의 표면처리를 위해 보편적으로 사용하는 기술로서, 보통 전해액이 채워져 있는 처리조 내에 양극으로서의 강판을 설치하고, 이와 대향되게 음극으로서의 금속판을 설치하여 전압을 걸어줌으로써, 강판이 음극의 금속판과 반응하여 표면이 녹게 되는 것이다.Here, electrolytic etching is a technique commonly used for surface treatment of steel sheets. A steel sheet is a cathode by installing a steel sheet as an anode in a treatment tank filled with an electrolyte solution and applying a voltage by installing a metal plate as a cathode opposite thereto. The surface melts by reacting with the metal plate.
이때, 전압을 가하는 시간은 300∼600초가 바람직하다.
한편, 아래의 표 1에서는 전류밀도와 시간에 따른 발청시간대한 시험 결과를 보여준다.At this time, the time for applying the voltage is preferably 300 to 600 seconds.
On the other hand, Table 1 below shows the test results for the time and the call time according to the current density.
상술한 시험 결과로부터 다음과 같은 사실을 알 수 있다.From the above test results, the following facts can be seen.
전류밀도 102㎂/㎠ 이상으로 하여 표면을 에칭(etching)하게 되면 강판의 초기 발청 속도가 줄어드는 것을 알 수 있다.
즉, 에칭 처리를 함으로써 강판의 표면이 세척되고 금속학적인 불순물이 제거되어 내식성이 향상된 것을 알 수 있으며, 또한 에칭 처리에 의해 강판의 표면 조도가 낮아지면서 발청물질이 강판 표면에 접촉되는 것이 억제되어 발청시간이 지연된 것을 알 수 있다.When the surface is etched with a current density of 10 2 mA / cm 2 or more, it can be seen that the initial rusting speed of the steel sheet decreases.
That is, it can be seen that the etching process washes the surface of the steel sheet and removes metallic impurities, thereby improving the corrosion resistance. Also, the surface roughness of the steel sheet is reduced by the etching treatment, and the contact of the rust-preventing material on the steel sheet surface is suppressed. It can be seen that the call out time was delayed.
그러나, 위의 표 1에서 볼 수 있는 바와 같이 102㎂/㎠ 이하의 전류밀도에서는 그 효과가 충분하지 않아 적절하지 못한 것을 알 수 있다.However, as can be seen in Table 1 above, at the current density of 10 2 mA / cm 2 or less, the effect is not sufficient and it can be seen that it is not appropriate.
또한, 102㎂/㎠ 이상의 전류밀도에서는 내식성능의 차이가 별로 발생하지 않는 것을 알 수 있으므로, 굳이 높은 전압을 가할 필요없이 가장 낮은 전압을 가하는 조건인 102㎂/㎠의 전류밀도와 300초의 인가시간으로 전해 에칭 처리를 하는 것이 바람직하다.In addition, it can be seen that the difference in corrosion performance does not occur very much at current densities of 10 2 ㎂ / ㎠ or more, so that the current density of 10 2 ㎂ / ㎠ and 300 seconds, which is the condition of applying the lowest voltage without having to apply a high voltage, It is preferable to perform an electrolytic etching process by application time.
따라서, 적절한 전류밀도의 전압으로 냉연강판의 표면을 녹여 압연 강판의 초기 발청 속도를 늦출 수 있게 하는 것이 가능하게 된다.Accordingly, it is possible to melt the surface of the cold rolled steel sheet at a voltage having an appropriate current density to slow down the initial rusting rate of the rolled steel sheet.
이상에서 본 바와 같이 본 발명은 압연공정을 끝낸 냉연 강판의 표면 거칠기에 따라 그 표면에 전류밀도가 다른 미세 전압을 소정의 시간으로 인가하여 강판의 표면을 녹일 수 있게 함으로써, 강판의 초기 발청 속도를 현저하게 늦출 수 있게 되어 냉연강판의 내식성을 향상시켜 주는 효과가 있는 것이다.As described above, according to the present invention, by applying a micro voltage having a different current density to the surface for a predetermined time according to the surface roughness of the cold-rolled steel sheet, the surface of the steel sheet can be melted, thereby increasing the initial rusting speed of the steel sheet. It is possible to remarkably slow the effect of improving the corrosion resistance of the cold rolled steel sheet.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990067652A KR100569335B1 (en) | 1999-12-31 | 1999-12-31 | Surface texturing method for cold steel sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019990067652A KR100569335B1 (en) | 1999-12-31 | 1999-12-31 | Surface texturing method for cold steel sheet |
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| Publication Number | Publication Date |
|---|---|
| KR20010066070A KR20010066070A (en) | 2001-07-11 |
| KR100569335B1 true KR100569335B1 (en) | 2006-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1019990067652A KR100569335B1 (en) | 1999-12-31 | 1999-12-31 | Surface texturing method for cold steel sheet |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61167000A (en) * | 1985-01-21 | 1986-07-28 | Nippon Kokan Kk <Nkk> | Removing method of oxide film from continuously annealed steel strip |
| JPH01177392A (en) * | 1988-01-08 | 1989-07-13 | Kansai Paint Co Ltd | Pretreatment of body to be coated by electrodeposition |
| KR19990053993A (en) * | 1997-12-24 | 1999-07-15 | 이구택 | Passive treatment method of stainless cold rolled steel plate |
-
1999
- 1999-12-31 KR KR1019990067652A patent/KR100569335B1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61167000A (en) * | 1985-01-21 | 1986-07-28 | Nippon Kokan Kk <Nkk> | Removing method of oxide film from continuously annealed steel strip |
| JPH01177392A (en) * | 1988-01-08 | 1989-07-13 | Kansai Paint Co Ltd | Pretreatment of body to be coated by electrodeposition |
| KR19990053993A (en) * | 1997-12-24 | 1999-07-15 | 이구택 | Passive treatment method of stainless cold rolled steel plate |
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| Publication number | Publication date |
|---|---|
| KR20010066070A (en) | 2001-07-11 |
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