KR0122334B1 - Etching method of hot dip zinc-coated sheet - Google Patents
Etching method of hot dip zinc-coated sheetInfo
- Publication number
- KR0122334B1 KR0122334B1 KR1019940030647A KR19940030647A KR0122334B1 KR 0122334 B1 KR0122334 B1 KR 0122334B1 KR 1019940030647 A KR1019940030647 A KR 1019940030647A KR 19940030647 A KR19940030647 A KR 19940030647A KR 0122334 B1 KR0122334 B1 KR 0122334B1
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- etching
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- hot
- galvanized steel
- dip galvanized
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- ing And Chemical Polishing (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Coating With Molten Metal (AREA)
- Physics & Mathematics (AREA)
Abstract
Description
제1도는 0.21 Al%-0.08 Pb%-Zn의 조성으로된 도금액으로 도금된 통상의 용융아연 도금 강판의 표면을 나타내는 사진.1 is a photograph showing the surface of a conventional hot-dip galvanized steel sheet plated with a plating liquid having a composition of 0.21 Al% -0.08 Pb% -Zn.
제2도는 본 발명의 에칭방법으로 처리된 용융아연 도금 강판의 표면을 나타내는 사진.2 is a photograph showing the surface of a hot-dip galvanized steel sheet treated by the etching method of the present invention.
본 발명은 용융아연 도금 강판의 표면 에칭방법에 관한 것이다.The present invention relates to a method of surface etching of a hot dip galvanized steel sheet.
아연 도금은 강판에 대한 뛰어난 희생 방식 효과와 저렴한 가격으로 현재 철강산업에 있어서 표면 처리 강판의 주류를 점하고 있다. 특히 아연 도금 강판 제조 방법중 강판을 용융된 아연에 침적하여 처리하는 용융아연 도금 강판은 아연 도금의 부착량을 두텁게 할 수 있고 광택성이 우수한 외관을 얻을 수 있다는 점에서 다른 방법보다도 널리 채용되고 있다.Galvanized steel is the mainstream of surface-treated steel sheet in the steel industry with its excellent sacrificial effect and low price. In particular, the hot-dip galvanized steel sheet in which the steel sheet is dipped in molten zinc and treated in a galvanized steel sheet manufacturing method is more widely used than other methods in that it can thicken the amount of zinc plating and provide an excellent gloss appearance.
이 용융아연 도금 강판 제조시에는 용융되었던 아연이 응고하면서 스팽글(Spangle)이라는 광택을 갖는 독특한 형상의 응고조직이 형성된다. 이 스팽글은 도금 조건에 따라 그 크기가 변하며 이에 따라 강판 전체의 광택등 외관도 크게 영향을 받게된다. 따라서 강판표면에 형성되는 스팽글의 크기 및 형상을 측정하는 것이 중요하나 특유의 광택으로 사진촬영등을 통한 측정이 곤란하다. 또한 스팽글은 용융아연이 응고하면서 결정되는 결정의 성장 방향에 의해 여러가지 종류로 나뉘어지지만 도금층의 표층에는 용융아연 도금액에 첨가되는 Al의 산화물이 형성되므로 아연도금의 결정을 육안이나 주사전자현미경으로 직접 관찰하는 것이 곤란하다.In the manufacture of the hot-dip galvanized steel sheet, a solidified structure of a unique shape having a gloss of spangles is formed while the molten zinc solidifies. The sequins vary in size depending on the plating conditions, and thus the appearance of the gloss light on the entire steel sheet is greatly affected. Therefore, it is important to measure the size and shape of the sequins formed on the surface of the steel sheet, but it is difficult to measure through photography, etc. due to the unique gloss. In addition, sequins are divided into various types according to the growth direction of crystals determined by solidification of molten zinc. However, zinc oxide is directly observed on the surface of the plated layer by forming an oxide of Al added to the molten zinc plating solution. It is difficult to do
종래에는 아연 도금 강판상에 형성되는 스팽글의 크기를 결정하기 위하여 용융아연 도금 강판에 투명한 종이등을 이용하여 직접 그려서 측정하거나 에칭액을 이용하여 부식시킨 후 화상분석기등을 이용하여 그 크기를 측정하였다.Conventionally, in order to determine the size of the sequins formed on the galvanized steel sheet, the hot-dip galvanized steel sheet was drawn by using a transparent paper or the like or measured by using an etching solution, and then the size thereof was measured using an image analyzer.
상기 에칭액을 이용하여 스팽글의 크기를 측정하는 방법으로는 다음과 방법이 개시되어 있다.The following method is disclosed as a method of measuring the size of the sequins using the said etching liquid.
일본의 오부등은 용융아연 도금 강판 시편을 CrO3200g, H2O 950CC, ZnSO4·7H2O 4g, 질산 5CC로 이루어진 1차 용액에 2-5분간 시편을 침적한 후, 다시 CrO3200g/ℓ의 2차 용액에 10-30초간 침적한 후 수세하고, 수세후 H2O 100CC, 염산 : 7-8CC, 과산화수소 10CC로 이루어진 3차 용액에 5-10초간 침적한 후 다시 시편을 진한 염산으로된 4차 용액에 1-2초간 침적하고 수세하여 용융아연 도금 강판을 에칭하였다.(일본 금속표면기술 24권 1호 페이지 14). 그러나, 상기 방법은 에칭에 소요되는 용액의 양이 많고 사용되는 용액의 종류도 많으며 여러 공정을 거쳐야 하므로 만족할 만한 결과를 얻기 위해서는 세심한 주의와 숙련된 기술이 요구되는 단점이 있는 것이다.In Japan, Obu et al. Deposited hot-dipped galvanized steel specimens in a primary solution consisting of 200 g of CrO 3 , H 2 O 950CC, ZnSO 4 · 7H 2 O 4g, and 5CC nitric acid for 2-5 minutes, and then again 200g of CrO 3 immersed in a secondary solution of / l for 10-30 seconds, and washed with water, and after washing with water washed in a tertiary solution consisting of H 2 O 100CC, hydrochloric acid: 7-8CC, 10CC hydrogen peroxide for 5-10 seconds The molten zinc plated steel sheet was etched by immersing in a quaternary solution consisting of 1-2 seconds and washed with water. However, since the method requires a large amount of solution required for etching, a large number of solutions used, and various processes, various methods and careful techniques are required to obtain satisfactory results.
또다른 예로서 미국의 연구자들이 제안한 방법을 들 수 있는데, 이 방법은 용융아연 도금 강판의 표면을 연마한 후 CrO3200g/ℓ, Na2SO415g/ℓ 용액에서 10-20초간 침적하는 것으로(Metallurigical Transaction B 1978, P581) 이는 용융아연 도금 강판의 표면을 연마해야 하는 문제점이 있다.Another example is the method proposed by the American researchers, which is to deposit 10-20 seconds in a solution of 200 g / l CrO 3 and 15 g / l Na 2 SO 4 after polishing the surface of the hot-dip galvanized steel sheet. (Metallurigical Transaction B 1978, P581) This has a problem of polishing the surface of the hot-dip galvanized steel sheet.
그리고, 기존의 제안된 방법들은 공통적으로 독성이 강한 CrO3를 다량 함유하고 있으므로 취급시 상당히 안전에 유의하여야 하며, 에칭이 끝난 후에는 다량의 중금속을 함유하는 폐수가 발생되며, 또한, 상기 방법으로도 용융아연 도금의 응고조직 관찰은 불가능하다.In addition, the existing proposed methods contain a large amount of highly toxic CrO 3 , so care must be taken for safety, and after etching, wastewater containing a large amount of heavy metal is generated. The observation of the solidified structure of hot dip galvanizing is impossible.
따라서, 현재 응고조직의 관찰은 X선 회절 시험을 통하여 간접적으로 행하여지고 있다. 또한, 상기 문제를 해결하기 위한 방법으로 한국 특허출원 제93-15398호 및 제93-23951이 제시되었다. 출원 제93-15398은 H2O 1000ml에 CrO35-10g/ℓ와 K2ZrF60.5-1g/ℓ를 첨가한 에칭 용액에 용융아연 도금 강판을 침적한 후 25-35분간, 50-60℃로 유지시켜 강판의 표면을 에칭시키는 방법에 관한 것이다.Therefore, the observation of the coagulation structure is currently indirectly performed through an X-ray diffraction test. In addition, Korean Patent Application Nos. 93-15398 and 93-23951 have been proposed as a method for solving the above problems. Application 93-15398 discloses 50-60 minutes after depositing a hot-dip galvanized steel sheet in an etching solution containing 5-10 g / l CrO 3 and 0.5-1 g / l K 2 ZrF 6 in 1000 ml of H 2 O. It relates to a method of etching the surface of a steel sheet by maintaining it at ℃.
상기 방법에서 침적되는 용융아연 도금 강판은 연마등 전처리 단계를 필요로 하지 않으며, 크로메이트 처리된 강판에도 사용할 수 있는 등 장점이 있으나, 30분 이상의 처리시간이 소요됨으로 그 결과를 파악하는데 장시간이 요구되고, 용액을 가열하여야 함으로 전열기등의 가열기구가 필요한 단점이 있다. 특허출원 제93-23951은 상기 방법을 개선한 것으로, 물 1ℓ에 CrO35-10g/ℓ, K2ZrF60.5-1g/ℓ, 35% HCl 30-100ml/ℓ, 및 30% 헥사민 2.5-20ml/ℓ를 첨가하여, 에칭용액으로 사용하며, 이 방법은 전술한 93-15398에 비하여 처리시간이 1-2분으로서 신속하기는 하나 크롬이 함유되어 있음으로 중금속 폐수의 발생이 불가피하다. 또한 응고조직의 관찰이 가능하나 결정립내의 내부 결정 성장 방향을 판별하는 데는 어려움이 많고 에칭면에 크롬이 석출하므로 조직에 있어서 구성원소의 종류나 분포를 분석시 석출 크롬의 간섭으로 정량이 불가능하다.The hot dip galvanized steel sheet deposited in the above method does not require a pretreatment step such as polishing, and can be used for chromate-treated steel sheets, but it takes a long time to grasp the result because the processing time is 30 minutes or more. However, there is a disadvantage that a heating device such as a heater is required because the solution must be heated. Patent Application No. 93-23951 is an improvement of the above method, in which 1 liter of water contains 5-10 g / l of CrO 3 , 0.5-1 g / l of K 2 ZrF 6, 30-100 ml / l of 35% HCl, and 30% hexamin 2.5. -20 ml / l is added and used as an etching solution. This method is faster than the above-mentioned 93-15398, although processing time is 1-2 minutes, but chromium is contained, and heavy metal waste water is inevitable. In addition, it is possible to observe the coagulation structure, but it is difficult to determine the direction of internal crystal growth in the grains, and because chromium is deposited on the etching surface, it is impossible to quantitate due to precipitation chromium interference when analyzing the type or distribution of element in the structure.
이에, 본 발명은 상기한 종래의 문제점을 해결하기 위하여 제안된 것으로, 유독한 중금속 폐수가 발생되지 않고, 에칭 처리시간이 짧으며, 사용하기 편리한 용융아연 도금 강판의 표면 에칭방법을 제공하는 것이다.Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and provides a method for etching the surface of a hot-dip galvanized steel sheet, which does not generate toxic heavy metal waste water, has a short etching treatment time, and is convenient to use.
본 발명에 의하면, 용융아연 도금 강판 표면에 형성된 스팽글의 크기 및 응고조직을 관찰하기 위한 에칭 방법에 있어서, 용융아연 도금 강판을 미세 연마하고, 수세한 후 에탄올 용매에 질산 0.5-2% 부피 및 용매 1L당 2-5g의 염화암모늄이 첨가된 에칭용액에 상기 용융아연 도금 강판을 5-15초간 침지함을 특징으로 하는 용융아연 도금 강판의 에칭 방법이 제공된다.According to the present invention, in the etching method for observing the size and solidification structure of the sequins formed on the surface of the hot-dip galvanized steel sheet, the hot-dip galvanized steel sheet is finely ground, washed with water, and then 0.5-2% nitric acid volume and solvent in ethanol solvent. Provided is an etching method of a hot-dip galvanized steel sheet, wherein the hot-dip galvanized steel sheet is immersed in an etching solution to which 2-5 g of ammonium chloride is added per 1 L for 5-15 seconds.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
용융아연 도금 강판 표면에 형성되는 스팽글의 크기 및 응고조직을 관찰하기 위하여 본 발명의 방법에 따라 용융아연 도금 강판을 에칭하기 위하여는 먼저 용융아연 도금 강판을 미세 연마한다.To etch the hot-dip galvanized steel sheet according to the method of the present invention in order to observe the size and solidification structure of the sequins formed on the hot-dip galvanized steel sheet surface, first, the hot-dip galvanized steel sheet is finely ground.
본 발명에서 미세연마란 에머리 페이퍼등의 조연마가 아닌 알루미나나 다이아몬드를 이용한 미세연마로 흔히 금속 조직학에서 쓰이고 있는 폴리싱수준의 연마를 말하며 분말의 크기는 큰 영향이 없으나 가장 바람직하게는 분말의 입도가 1μ일 때 그 감도가 가장 우수하였다. 연마시간은 관찰자에 따라 다를 수 있으나 약 10초 정도로 표면의 산화물이나 이물이 없어지는 정도면 충분하다.In the present invention, the micro-polishing refers to the polishing of polishing level, which is commonly used in metallography, rather than the coarse polishing of emery paper and the like. The sensitivity was the best when. The polishing time may vary depending on the observer, but it is sufficient to remove about 10 seconds of oxide or foreign material on the surface.
용융아연 도금 강판을 연마한 후 수세하여야 하는데, 이때 수세는 강판 표면의 연마 분말을 제거할 수 있을 정도면 충분하다.After polishing the hot-dip galvanized steel sheet, washing with water should be sufficient to remove the abrasive powder from the surface of the steel sheet.
수세후, 강판을 에칭용액에 침지하여 에칭시키는데, 에칭용액은 에탄올 용매에 질산과 염화암모늄이 첨가된 것이다.After washing with water, the steel sheet is immersed in an etching solution and etched. The etching solution is obtained by adding nitric acid and ammonium chloride to an ethanol solvent.
용매로는 에칭반응에 참여하지 않고 에칭시험후에도 표면에서 쉽게 휘발하는 메탄올 또는 에탄올을 사용할 수 있으나, 메탄올은 유독성이고, 처리후 인체에 유독한 폐액이 남는 등의 문제가 있음으로, 에탄올을 사용하는 것이 바람직하며, 또한 에탄올은 본 발명의 질산 : 알코올의 혼합비에서 반응없이 쉽게 혼합된다.As a solvent, methanol or ethanol, which does not participate in the etching reaction and easily volatilizes after the etching test, may be used. However, methanol is toxic and there is a problem that a toxic waste solution remains in the human body after treatment. Preferably, ethanol is also easily mixed without reaction at the mixing ratio of nitric acid: alcohol of the present invention.
상기 에칭용액중 질산이 용융아연 도금 강판의 표면을 에칭시키는 주요물질이며, 흔히 공업적으로 사용되는 진한 질산을 사용한다.Nitric acid in the etching solution is the main material for etching the surface of the hot-dip galvanized steel sheet, and concentrated nitric acid, which is commonly used industrially, is used.
에탄올 용매에 질산을 0.5부피% 이하로 첨가한 경우에는 질산으로부터의 수소공급이 저조하여 표면에서의 에칭을 기대하기 어렵고, 질산이 2부피% 이상 첨가된 경우에는 에칭이 과다하여 처리시간을 조절할 수 없으므로 첨가되는 질산의 양은 0.5-2부피%가 바람직하다.When 0.5% by volume or less of nitric acid is added to the ethanol solvent, the hydrogen supply from nitric acid is poor, and it is difficult to expect etching on the surface. When 2% or more of nitric acid is added, the etching time is excessive and the treatment time can be controlled. Therefore, the amount of nitric acid added is preferably 0.5-2% by volume.
상기 용매에 질산과 함께 첨가된 상기 염화암모늄은 용융아연 도금 강판에 생성되는 부식생성물을 선택적으로 제거하는 효과가 있다.The ammonium chloride added with nitric acid to the solvent has an effect of selectively removing the corrosion products generated in the hot-dip galvanized steel sheet.
용융아연 도금 강판 제조시 첨가되는 알루미늄은 친화력이 강하므로 산성분위기에서 쉽게 부식되어 부식생성물이 형성되고 이는 아연에 비하여 내산성이 강하므로 에칭시 국부적으로 반응속도가 떨어져 평탄한 에칭면을 얻을 수 없게 된다. 염화암모늄은 상기 부식생성물을 용해시켜줌으로 에칭시 평탄화 효과를 높일 수 있는 것이다.Aluminum added during the manufacture of hot-dip galvanized steel sheet has a strong affinity, so that it is easily corroded in an acidic atmosphere to form a corrosion product, and since acid resistance is stronger than zinc, the reaction rate is locally lowered during etching, so that a flat etching surface cannot be obtained. Ammonium chloride can enhance the planarization effect during etching by dissolving the corrosion product.
염화암모늄은 용매의 양을 기준으로 1L당 2-5g이 첨가되는데, 2g/ℓ 이하에서는 부식생성물의 제거효과를 나타내기 어렵고, 5g/ℓ 이상에서는 과부식될 우려가 있다.Ammonium chloride is added 2-5g per 1L based on the amount of solvent, it is difficult to exhibit the removal effect of corrosion products at 2g / L or less, there is a risk of overcorrosion at 5g / L or more.
상기 용융아연 도금 강판은 에칭용액에 바람직하게는 5-15초간 침지처리한다. 5초 이하로 침지할 경우 에칭면의 감도가 떨어지게 되고 15초 이상 침지할 경우에는 과부식될 우려가 있다.The hot dip galvanized steel sheet is preferably immersed in an etching solution for 5-15 seconds. When immersed for 5 seconds or less, the sensitivity of the etching surface is decreased, and when immersed for 15 seconds or more, there is a risk of over corrosion.
상기 본 발명의 에칭방법으로 에칭한 후에는 통상적인 금속조직 관찰과 같이 시편을 흐르는 물에 수세하고 건조시킨후 광학 현미경이나 전자현미경을 이용하여 구조를 관찰한다.After etching by the etching method of the present invention, the specimen is rinsed with running water and dried as in the conventional metallographic observation, and then the structure is observed using an optical microscope or an electron microscope.
이하, 본 발명의 실시예에 대하여 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail.
(실시예 1)(Example 1)
에칭액의 조성을 하기표 1과 같이 변화시켜 용융아연 도금 강판을 에칭한 후 표면 조직을 육안으로 관찰, 판별하였다. 본 실시예에서 1μ의 다이아몬드 분말을 이용하여 10초간 용융아연 도금 강판을 미세연마하고 수세한 후 각각 조성이 다른 에칭 용액에 10초간 침지하여 에칭하였다.The composition of the etching solution was changed as shown in Table 1 below to etch the hot-dip galvanized steel sheet, and the surface structure was visually observed and determined. In this example, the hot-dip galvanized steel sheet was finely polished for 10 seconds using 1 μm diamond powder, washed with water, and immersed in an etching solution having a different composition for 10 seconds.
하기표 1에 나타낸 바와 같이 본 발명의 조건으로 에칭한 발명예(a)-(i)의 경우에는 어느 조건에서나 표면조직 관찰이 용이함을 알 수 있다.As shown in Table 1, in the case of Inventive Examples (a) to (i) etched under the conditions of the present invention, it can be seen that surface structure observation is easy under any conditions.
반면에 질산이 본 발명의 범위인 0.5부피% 보다 적게 첨가된 비교예(1-3)에서는 처리시간을 변화시켜도 에칭정도가 저조하여 표면관찰이 어렵고, 질산을 2.0부피% 이상 첨가한 비교예(5)의 경우에는 과부식이 발생하여 표면관찰이 불가능함을 알 수 있다. 또한 침지시간이 본 발명의 범위보다 짧은 비교예(4)와 (6)의 경우에는 에칭 정도가 미약함을 알 수 있다.On the other hand, in Comparative Example (1-3) in which less than 0.5% by volume of nitric acid was added in the range of the present invention, the etching degree was low even though the treatment time was changed, and thus surface observation was difficult, and Comparative Example in which nitric acid was added in 2.0 vol% or more In case of 5), it can be seen that surface observation is impossible due to over corrosion. In addition, in the case of Comparative Examples (4) and (6) in which the immersion time is shorter than the range of the present invention, the etching degree is weak.
침지시간이 15초를 초과한 경우[비교예(7,8,9)]에는 질산의 첨가량이 본 발명의 범위내이더라도 모두 과부식됨을 알 수 있다. 한편, 염화암모늄이 첨가량이 본 발명의 범위 보다 적은 비교예(10)의 경우에는 에칭이 약하고, 본 발명의 범위보다 과량 첨가한 경우에는 비교예(11)에서와 같이 과부식됨을 알 수 있다.In the case where the immersion time exceeds 15 seconds (Comparative Examples (7, 8, 9)), it can be seen that even if the amount of nitric acid added is within the scope of the present invention, all are corroded. On the other hand, in the case of the comparative example (10) in which the amount of ammonium chloride added is less than the range of the present invention, the etching is weak, and in the case of excessive addition of the ammonium chloride in the range of the present invention, it can be seen that it is excessively corroded as in the comparative example (11).
[표 1]TABLE 1
(실시예 2)(Example 2)
도금액 조성 0.12 Al%-0.08 Pb%-Zn로 용융 도금된 통상의 용융아연 도금 강판을 1μ의 다이아몬드 분말로 10초간 미세연마하고 수세한 후 에탄올 용매에 질산 1부피% 및 용매의 중량을 기준으로 용매 1ℓ 당 염화암모늄 3g을 첨가하여 조성된 에칭용액에 상온에서 10초간 침지하여 에칭하고 강판표면조직을 관찰하였다. 본 실시예에서 사용된 용융아연 도금 강판의 크기는 100×100(mm)이였다.Conventional hot-dip galvanized steel sheet plated with a plating solution composition of 0.12 Al% -0.08 Pb% -Zn was finely polished for 10 seconds with 1μ diamond powder, washed with water, and then ethanol solvent based on 1% by volume of nitric acid and the weight of the solvent. 3 g of ammonium chloride was added per 1 L, and the resultant was etched by immersion at room temperature for 10 seconds to observe the surface texture of the steel sheet. The size of the hot-dip galvanized steel sheet used in this example was 100 × 100 (mm).
에칭전의 용융아연 도금 강판의 표면조직을 제1도에, 그리고 본 발명의 방법으로 에칭처리된 용융아연도금 강판의 표면조직을 제2도에 나타냈다.The surface texture of the hot-dip galvanized steel sheet before etching is shown in FIG. 1, and the surface texture of the hot-dip galvanized steel sheet etched by the method of the present invention is shown in FIG.
제1도에 나타낸 바와 같이 에칭을 하지 않은 상태에서는 표면 조직에서 스팽글의 크기를 바로 측정하기 곤란하고 스팽글 내부의 결정 성장방향등도 관찰이 불가능함을 알 수 있다. 반면에, 제2도에 나타낸 바와 같이 본 발명의 에칭방법으로 에칭처리하여 관찰할 경우에는 스팽글의 크기 판별 및 결정의 성장방향을 관찰하기 용이함을 알 수 있다.As shown in FIG. 1, it can be seen that in the non-etched state, it is difficult to directly measure the size of the sequins in the surface structure, and it is impossible to observe the crystal growth direction inside the sequins. On the other hand, as shown in FIG. 2, when etched and observed by the etching method of the present invention, it can be seen that the size of the sequins and the growth direction of the crystal are easily observed.
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019940030647A KR0122334B1 (en) | 1994-11-21 | 1994-11-21 | Etching method of hot dip zinc-coated sheet |
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| KR20150045697A (en) * | 2013-10-21 | 2015-04-29 | 주식회사 포스코 | Method for manufacturing of twip steel extraction reproduction |
| KR102305208B1 (en) * | 2020-05-19 | 2021-09-27 | 현대제철 주식회사 | Method of measuring bonding strength of coated steel sheet using tensile test |
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| KR20150045697A (en) * | 2013-10-21 | 2015-04-29 | 주식회사 포스코 | Method for manufacturing of twip steel extraction reproduction |
| KR102305208B1 (en) * | 2020-05-19 | 2021-09-27 | 현대제철 주식회사 | Method of measuring bonding strength of coated steel sheet using tensile test |
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