KR100240991B1 - The etching solution and the method of using it for observing metallography of the lowest carbon steel - Google Patents
The etching solution and the method of using it for observing metallography of the lowest carbon steel Download PDFInfo
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- KR100240991B1 KR100240991B1 KR1019950049558A KR19950049558A KR100240991B1 KR 100240991 B1 KR100240991 B1 KR 100240991B1 KR 1019950049558 A KR1019950049558 A KR 1019950049558A KR 19950049558 A KR19950049558 A KR 19950049558A KR 100240991 B1 KR100240991 B1 KR 100240991B1
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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
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Abstract
본 발명은 자동차의 외판재등으로 사용되는 극저탄소강의 조직관찰용 에칭용액 및 이를 이용한 에칭방법에 관한 것으로 성분계를 조정하여 에칭용액을 제조하고 이를 이용하여 극저탄소강을 적정조건으로 에칭하므로서 에칭된 극저탄소강의 조직재현성이 우수할뿐만 아니라 용이하게 극저탄소강의 조직관찰이 가능한 극저탄소강의 조직관찰용 에칭용액 및 이를 이용한 에칭방법을 제공하고자 하는데, 그 목적이 있다.The present invention relates to an etching solution for the observation of ultra-low carbon steel used as an exterior plate of an automobile, and an etching method using the same, to prepare an etching solution by adjusting the component system, and to etch the ultra-low carbon steel by etching it under appropriate conditions. An object of the present invention is to provide an etching solution for tissue observation of an ultra low carbon steel and an etching method using the same, which are excellent in tissue reproducibility of the ultra low carbon steel and can easily observe the structure of the ultra low carbon steel.
상기한 목적을 달성하기 위한 본 발명은 티오황산나트륨(Na2S2O5):1.0-1.5g/ℓ, 염산:10-30cc/ℓ, 소디움도데실벤젠술폰산나트륨(C12H26C8H4SO2Na):10-30cc/l 및 나머지:물로 조성된 극저탄소강의 조직관찰용 에칭용액 및 이를 이용한 극저탄소강의 에칭방법에 관한 것을 그 요지로 한다.The present invention for achieving the above object is sodium thiosulfate (Na 2 S 2 O 5 ): 1.0-1.5 g / L, hydrochloric acid: 10-30 cc / L, sodium dodecyl benzene sulfonate (C 12 H 26 C 8 H 4 SO 2 Na): 10-30cc / l and the remainder: It is about the etching solution for the structure observation of the ultra low carbon steel which consists of water, and the etching method of the ultra low carbon steel using the same.
Description
제1도는 본 발명의 방법이 적용된 경우와 그렇지 않은 경우의 극저탄소강의 표면에칭 조직사진으로,1 is a surface etching texture photograph of ultra-low carbon steel with and without the method of the present invention,
(a)-(d)(f)는 비교예의 경우.(a)-(d) (f) are the comparative examples.
(e)는 발명예의 경우이다.(e) is a case of the invention example.
본 발명은 자동차의 외판재등으로 사용되는 극저탄소강의 조직관찰용 에칭용액 및 이를 이용한 에칭방법에 관한 것으로, 보다 상세하게는, 재현성이 우수한 극저탄소강의 조직관찰용 에칭용액 및 이를 이용한 에칭방법에 관한 것이다.The present invention relates to an etching solution for tissue observation of an ultra low carbon steel used as an outer plate material of an automobile, and an etching method using the same. More particularly, the present invention relates to an etching solution for an extremely low carbon steel texture observation and an etching method using the same. It is about.
극저탄소강은 Ti 또는 Nb등의 탄화물 형성원소를 첨가시켜 고용탄소량을 50ppm이하로 제어한 강으로, 현재 매우 주요한 강종의 하나이다.The ultra low carbon steel is a steel whose carbon content is controlled to 50 ppm or less by adding carbide forming elements such as Ti or Nb, and is one of the major steel grades.
이러한 극저탄소강의 조직관찰을 위한 표면의 에칭시 여기에 사용되는 에칭용액으로는 종래 나이탈이나 피크릭산등을 주성분으로한 용액들이 주로 사용되었는데, 이들의 경우, 다음과 같은 문제점이 있다.In the etching of the surface for the observation of the ultra-low carbon steel, as the etching solution used here, a solution mainly containing nital or picric acid is mainly used. In these cases, there are problems as follows.
저탄소강의 에칭에 주로 사용되는 나이탈 용액과 이를 기본으로 염산, 피크린산, 및 과산화수소등 첨가제를 1종 단독 또는 2종 이상 복합첨가한 개량용액의 경우, 극저탄소강에 적용시키면 에칭핏트가 다량 발생하는 문제점이 있다.In the case of a nital solution mainly used for etching of low carbon steel and an improved solution in which additives such as hydrochloric acid, picric acid, and hydrogen peroxide are added alone or in combination of two or more kinds, the etching pits are generated when applied to the ultra low carbon steel. There is a problem.
피크릭산 포화용액을 기본액으로 하여 여기에 피로아황산나트륨, 치오황산나트륨을 각각 단독 첨가한 에칭용액으로 극저탄소강을 에칭한 경우에는 에칭이 불충분하고 재현성이 낮은 문제점이 있다.In the case where the ultra low carbon steel is etched using an aqueous solution of saturated picric acid as the base solution, sodium pyrosulfite and sodium thiosulfate are added alone, there is a problem of insufficient etching and low reproducibility.
일본 공개특허공보 평1-185444호는, 물 100ml에 도데실벤젠술폰산나트륨 2-10-g/L, 수산 0.1-1g/L, 피크린산 1-5g/L를 용해한 수용액을 만들고 이에 철 0.1-0.5g/L를 용해한 후 다시 염산 2-3ml/L를 첨가한 용액을 에칭용액으로 하여, 이 용액을 30-60℃로 가열 유지시킨 상태에서 표면을 에머리페이퍼등으로 연마한 극저탄소강을 30-120초간 침적하여 부식한 후, 수세, 건조하여 광학현미경으로 그 조직을 관찰하는 방법이다. 그러나 이 방법은 첨가되는 성분이 많아 용액제조가 불편하고 에칭시간이 길기 때문에 에칭작업에 상당한 숙련도가 요구되어 작업자에 따라서는 재현성에 편차가 발생할 위험이 있다는 단점이 있다.Japanese Unexamined Patent Application Publication No. Hei 1-85444 makes an aqueous solution in which 2-10-g / L sodium dodecylbenzenesulfonate, 0.1-1 g / L hydroxyl, and 1-5 g / L picric acid are dissolved in 100 ml of water, thereby adding 0.1-0.5 iron. After melt | dissolving g / L, the solution which added 2-3 ml / L hydrochloric acid was made into the etching solution, and the ultra-low carbon steel which grind | polished the surface with emery paper etc. while maintaining this solution heated at 30-60 degreeC is carried out. It is a method of immersing for 120 seconds to corrode, followed by washing with water and drying to observe the structure with an optical microscope. However, this method has a disadvantage in that there is a risk of variation in reproducibility, which requires a large amount of skill in etching work because of the inconvenience of solution preparation and long etching time due to the large amount of added components.
상기한 방법외에도 대한민국의 포항종합제철(주)에서 출원한 것으로, 물 100ml에 피크린산 6-10g, 염산 0.1-1.5ml 60-80℃에서 5-20초간 부식하는 방법도 있으나, 이방법에서는 피크린산에 염산이 첨가되면 상온에서는 시약이 응고되어 결정을 이루고 시약의 농도가 묽어진다는 결점과, 부식후 시약이 시편에서 제거가 어려워 작업자 손과 기기에 오염이 된다는 문제와 가열의 경우 시약이 100℃에서 끓어 넘칠 경우 폭발의 위험과 인체 기관지에 치명적인 손상을 준다뿐만 아니라 부식후 시편의 상태에도 부분적으로 얼룩이 발생하여 시편상태에서 영상분석이 불가능 하다는 문제가 있다.In addition to the above-mentioned method, it is filed by Pohang Iron & Steel Co., Ltd. of Korea, and it may be corroded for 5-20 seconds at 6-10 g of picric acid in 100 ml of water and 0.1-1.5 ml of hydrochloric acid at 60-80 ° C. When hydrochloric acid is added, the reagents solidify at room temperature to form crystals, and the concentration of reagents is diminished.It is difficult to remove reagents from specimens after corrosion, which contaminates the operator's hands and the equipment. Boiling over causes not only the risk of explosion and fatal damage to the human bronchus, but also the problem that the image analysis is impossible in the state of the specimen due to partial staining even after the corrosion.
이에, 본 발명자는 상기한 에칭용액들의 단점을 해결하여 재현성이 우수할 뿐만 아니라 용이하게 극저탄소강의 조직관찰이 가능한 에칭용액 및 이를 이용한 에칭방법에 관하여 연구와 실험을 행하고, 그 결과에 근거하여 본 발명을 제안하게 된 것이다.Thus, the present inventors have solved the disadvantages of the etching solutions described above, and research and experiment on the etching solution and the etching method using the same, which is not only excellent in reproducibility but also easy to observe the ultra low carbon steel, and based on the results It is to propose the invention.
본 발명은 성분계를 조정하여 에칭용액을 제조하고 이를 이용하여 극저탄소강을 적정조건으로 에칭하므로서 에칭된 극저탄소강의 조직 재현성이 우수할뿐만 아니라 용이하게 극저탄소강의 조작관찰이 가능한 극저탄소강의 조직관찰용 에칭용액 및 이를 이용한 에칭방법을 제공하고자 하는데, 그 목적이 있다.The present invention provides a very low-carbon steel texture observation by adjusting the component system to prepare an etching solution and by using the same to etch the ultra-low carbon steel in a proper condition, not only excellent organization reproducibility of the etched ultra-low carbon steel but also easy operation observation of the ultra-low carbon steel To provide a solution etching solution and an etching method using the same, there is a purpose.
이하, 본 발명에 대하여 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.
본 발명은 티오황산나트륨(Na2S2O5):1.0-1.5g/1, 염산:10-30cc/1, 소디움도데실벤젠술폰산나트륨(C12H26C8H4SO2Na):10-30cc/l 및 나머지:물로 조성된 극저탄소강의 조직관찰용 에칭용액에 관한 것이다.The present invention is sodium thiosulfate (Na 2 S 2 O 5 ): 1.0-1.5 g / 1, hydrochloric acid: 10-30 cc / 1, sodium dodecyl benzene sulfonate (C 12 H 26 C 8 H 4 SO 2 Na): 10 It relates to an etching solution for tissue observation of ultra-low carbon steel composed of -30 cc / l and the remainder: water.
또한, 본 발명은 극저탄소강의 조직관찰을 위한 에칭방법에 있어서, 상기 극저탄소강을 티오황산나트륨(Na2S2O5):1.0-1.5g/1, 염산:10-30cc/1, 소디움도데실벤젠술폰산나트륨(C12H26C8H4SO2Na):10-30cc/l 및 나머지:물로 조성된 상기한 에칭용액에 1-2분간 침적하여 에칭하는 단계; 및 상기 침적된 극저탄소강을 4-8% 나이탈 용액에 5-10초간 침적하여 에칭하는 단계를 포함하여 이루어지는 극저탄소강의 에칭방법에 관한 것이다.In addition, the present invention in the etching method for the observation of the ultra-low carbon steel, the ultra-low carbon steel sodium thiosulfate (Na 2 S 2 O 5 ): 1.0-1.5g / 1, hydrochloric acid: 10-30cc / 1, sodium dode Sodium silbenzenesulfonic acid (C 12 H 26 C 8 H 4 SO 2 Na): 10-30 cc / l and the remainder: by immersing for 1-2 minutes in the above-described etching solution composed of water and etching; And immersing the deposited ultra low carbon steel in a 4-8% nital solution for 5-10 seconds and etching the same.
이하, 본 발명에 대하여 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
상기한 본 발명의 목적을 달성하기 위하여 본 발명에서는 우선 에칭용액을 상기와 같이 조성함이 바람직한데, 그 이유는 다음과 같다.In order to achieve the above object of the present invention, in the present invention, it is preferable to first prepare an etching solution as described above.
티오황산나트륨은 반응촉진제로 작용하여 단시간에 미세조직의 에칭을 일으키며 표면의 불순물을 제거하여 표면얼룩발생을 방지하는 역할을 하는 성분으로, 그 함량이 1.0g/l이하일 경우에는 상기한 반응의 촉진효과를 충분히 얻기 힘들고, 1.5g/l이상일 경우에는 반응이 너무 빨리 진행하여 과부식이 진행되기 쉬우므로, 그 함량은 1.0-1.5g/l범위로 제한함이 바람직하다.Sodium thiosulfate acts as a reaction accelerator to cause etching of microstructures in a short time, and removes impurities from the surface to prevent surface staining. When the content is less than 1.0 g / l, the effect of promoting the above reaction If it is difficult to obtain sufficiently, and more than 1.5 g / l, the reaction proceeds too fast to easily over-etch, the content is preferably limited to 1.0-1.5 g / l range.
염산은 금속(극저탄소강)이 침적되었을 때 강산으로서 수소를 발생시키며 표면을 부식시키는 역할을 하는 성분으로, 기존에 사용되던 피크릭산보다 강산으로 빠른시간에 강판표면이 에칭이 가능한 장점이 있다. 이러한 염산의 함량이 10cc/l 이하일 경우에는 에칭의 효과가 떨어지며, 30cc/l이상일 경우에는 과부식이 발생할 우려가 크므로 염산의 함량은 10-30cc/l의 범위로 제한함이 바람직하다.Hydrochloric acid generates hydrogen as a strong acid when metal (ultra-low carbon steel) is deposited and serves to corrode the surface.It has the advantage that the surface of steel sheet can be etched with a strong acid faster than previously used picric acid. . If the amount of such hydrochloric acid is less than 10cc / l, the effect of etching is reduced, and if more than 30cc / l is likely to cause over corrosion, it is preferable to limit the content of hydrochloric acid in the range of 10-30cc / l.
소디움 도데실 벤젠술포산나트륨은 계면활성제로서 관찰하고자 하는 면을 균일하게 반응시켜 2차 에칭시 선명한 에칭상을 얻을수 있도록 하는 성분으로서, 그 함량이 10cc/l이하일 경우에는 상기한 효과를 보기가 힘들고, 30cc/l이상일 경우에는 그 효과가 지나쳐 오히려 표면이 손상을 받을 위험이 있으므로, 그 함량은 10-30cc/l의 범위로 제한함이 바람직하다.Sodium dodecyl benzenesulfonate sodium is a component that allows the surface to be observed to be uniformly reacted as a surfactant to obtain a clear etching phase during the second etching. When the content is less than 10 cc / l, it is difficult to see the above effects. In case of more than 30cc / l, the effect is excessive and there is a risk of damage to the surface. Therefore, the content is preferably limited to the range of 10-30cc / l.
한편, 본 발명에서는 상기와 같이 조성된 에칭용액에 금속(극저탄소강)을 1-2분간 1차적으로 침적하여 에칭하므로서, 그 표면이 얼룩을 제거한 후, 2차적으로 4-8%의 나이탈용액에서 5-10초간 침적하여 에칭함이 바람직한데, 그 이유는 다음과 같다.Meanwhile, in the present invention, the metal (ultra low carbon steel) is first deposited and etched for 1-2 minutes in the etching solution prepared as described above. It is preferable to immerse and etch for 5-10 seconds in the solution for the following reasons.
금속(극저탄소강을) 상기와 같이 조성되는 에칭용액에 침적시켜 그 표면을 에칭하게되면 우수한 에칭조직을 얻기위한 표면의 활성화가 이루어지는데, 침적시간이 1분이하일 경우에는 그 효과가 없으며, 2분이상일 경우에는 1차부식에서 과부식이 일어나 후속되는 2차부식시 정확한 에칭조직을 얻을수 없으므로, 침적시간은 1-2분으로 제한함이 바람직하다.When the surface of the metal (ultra low carbon steel) is immersed in the etching solution formed as described above and the surface is etched, the surface is activated to obtain an excellent etching structure. When the deposition time is less than 1 minute, there is no effect. In the case of more than 1 minute, since the over-corrosion occurs in the primary corrosion, the accurate etching structure cannot be obtained during the subsequent secondary corrosion, so that the deposition time is preferably limited to 1-2 minutes.
상기와 같이 1차부식을 완료한 후에는 통상의 일반 탄소강에서 사용하는 나이탈 용액을 사용하여 2차부식을 실시하게되는데, 그 이유는 나이탈 용액을 사용하게되면 에칭이 곤란한 극저탄소강을 용이하게 에칭이 가능하고 또한 1차부식에서 생긴 표면얼룩을 제거하는 것이 가능하기 때문이다. 이때, 나이탈 에칭은 통상적으로 행하는 조건인 상온에서 5-10초간 처리하면 된다.After completion of the primary corrosion as described above, the secondary corrosion is carried out using a nital solution used in ordinary ordinary carbon steel, because the use of the nital solution is easy to difficult ultra-low carbon steel difficult to etch This is because it is possible to etch and to remove surface stains caused by primary corrosion. At this time, nital etching may be performed for 5-10 seconds at normal temperature which is a condition normally performed.
상기한 1차 및 2차에칭시 에칭은 상온에서 실시하면된다.In the primary and secondary etching described above, etching may be performed at room temperature.
이하, 실시예를 통하여 본 발명에 대하여 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
[실시예 1]Example 1
강성분 0.003%C-0.26%Mn-0.071%P-0.05%Ti-Fe로 조성된 극저탄소강을 에머리페이퍼 220번에서 1500번으로 조연마한 후, 다시 다이아몬드나 알루미늄산화물로 미세연마하여 시편을 경면으로 제작한 후, 아래 용액 조건과 방법으로 에칭을 시킨후, 그 조직을 광학현미경(X200)으로 관찰하여, 제1도에 나타내었다.Ultra-low carbon steel composed of steel components 0.003% C-0.26% Mn-0.071% P-0.05% Ti-Fe was polished from Emery Paper No. 220 to 1500, and then finely polished with diamond or aluminum oxide to mirror the specimen. After fabrication, the substrate was etched with the following solution conditions and methods, and then the structure was observed with an optical microscope (X200) and shown in FIG.
[비교예 (a)][Comparative Example (a)]
4% 피크릭산, 에칭시간 1분4% picric acid, etching time 1 min
[비교예 (b)][Comparative Example (b)]
4% 나이탈, 에칭시간 40초4% Nital, etching time 40 seconds
[비교예 (c)]Comparative Example (c)
상기한 포항종합제철(주)에 의한 방법 20초20 seconds by the above-mentioned method by Pohang Iron & Steel Co., Ltd.
[비교예 (d)][Comparative Example (d)]
40ppm 이상의 강, 4% 나이탈 에칭시간 10초40ppm steel or more, 4% nital etching time 10 seconds
[발명예 (e)]Invention Example (e)
물 1000ml에 티오황산나트륨(Na2S2O5) 1.5g/L, 염산 100c/L, 소디움 도데실벤젠 술폰산 나트륨 20cc/L로 조성된 용액에서 1분간 1차적으로 부식시켜 표면의 얼룩을 제거한 후, 2차적으로 4% 나이탈 용액에서 8초간 부식In 1000 ml of water, 1.5 g / L sodium thiosulfate (Na 2 S 2 O 5 ), 100 c / L hydrochloric acid, and 20 cc / L sodium dodecylbenzene sodium sulfonate were first corroded for 1 minute to remove surface stains. , Secondary corrosion in 4% nital solution for 8 seconds
[비교예 (f)]Comparative Example (f)
염산이나 도데실벤벤 술폰산나트륨 시약첨가가 많은 경우When there is a lot of reagent addition of hydrochloric acid or sodium dodecylbene sulfonate
제1(a)도-제1(f)도에서 알 수 있는 바와 같이, 본 발명의 범위를 만족하는 발명예 (e)의 경우, 본 발명의 범위를 만족하지 못하는 비교예(a-d, f)의 경우에 비하여 극저탄소강의 조직을 정확히 관찰할수 있음을 알 수 있다.As can be seen from FIGS. 1 (a) to 1 (f), in the case of Inventive Example (e) satisfying the scope of the present invention, Comparative Examples (ad, f) not satisfying the scope of the present invention It can be seen that the structure of the ultra low carbon steel can be observed accurately compared to
[실시예 2]Example 2
강성분 0.003%C-0.26%Mn-0.071%P-0.05%Ti-Fe로 조성되는 극저탄소강을 에머리페이퍼 220번에서 1500번으로 조연마한 후, 다시 다이아몬드나 알루미늄산화물로 미세 연마하여 시편을 경면으로 제작한 후, 하기 표 1과 같은 조건으로 그 표면을 1차 에칭처리한후, 4% 나이탈 용액을 사용하여 8초간 2차 에칭한 다음, 극저탄소강 표면의 얼룩 발생유무 및 부식정도를 평가하고 그 결과를 하기 표 2에 나타내었다.The ultra low carbon steel, composed of 0.003% C-0.26% Mn-0.071% P-0.05% Ti-Fe, is polished from emery paper No. 220 to 1500, and then polished with fine diamond or aluminum oxide. After fabrication, the surface was first etched under the conditions shown in Table 1, followed by secondary etching for 8 seconds using a 4% nital solution, and then staining and corrosion of the ultra low carbon steel surface. It was evaluated and the results are shown in Table 2 below.
이때 극저탄소강 표면 부식정도의 판정은 1차 부식후 표면을 관찰하여 얼룩발생 유무를 관찰하였고, 에칭조직은 2차 부식후의 표면을 광학현미경으로 조사하여 미흡, 우수, 불량으로 구분하였다.At this time, the evaluation of the surface corrosion degree of the ultra low carbon steel was observed by the observation of the surface after the first corrosion, and the occurrence of staining was examined, and the etching structure was classified into inadequate, excellent, and poor by irradiating the surface after the secondary corrosion with an optical microscope.
미흡:부식이 충분하지 않음.Poor: Not enough corrosion.
우수:정확한 표면조직의 관찰이 가능함.Excellent: Accurate surface texture can be observed.
불량:부식이 심하게된 상태, 과부식.Poor: Severe corrosion, excessive corrosion.
[표 1]TABLE 1
상기 표 1에서 알수 있는 바와같이, 본 발명의 범위를 만족하는 발명예(1-3)은 우수한 에칭조직면을 얻을수 있었다. 반면에 본 발명의 범위를 만족하지 못하는 비교예의 경우 비교예의 (A,B)는 티오황산나트륨의 발명의 조건을 벗어난 것으로 표면얼룩이나 조직 모두 만족할만한 결과를 얻을수 없었으며 염산, 도데실 벤젠 술폰산나트륨의 범위를 벗어나는 비교예(C,D,E,F)에서도 비슷한 결과를 보였다. 또한 부식시간도 큰영향을 미쳐 본 발명이 정한 1-2분을 벗어날 경우에도 우수한 표면조직 관찰이 곤란하였다. 상술한 바와같이, 본 발명은 에칭용액의 조성 및 이를 이용하여 극저탄소강의 에칭조건을 적절히 제어하므로서 극저탄소강의 표면조직을 손쉽고 정확하게 관찰할수 있으며 에칭조직의 재현성이 높은 효과가 있다.As can be seen from Table 1, Inventive Example (1-3) satisfying the scope of the present invention was able to obtain an excellent etching structure surface. On the other hand, in the case of the comparative example that does not satisfy the scope of the present invention (A, B) of the comparative example is beyond the conditions of the invention of sodium thiosulfate, it was not possible to obtain a satisfactory result of both surface stains and tissues of hydrochloric acid, sodium dodecyl benzene sulfonate Similar results were obtained in Comparative Examples (C, D, E, F) out of range. In addition, the corrosion time also had a significant effect, even when the deviation of the present invention 1-2 minutes was difficult to observe the excellent surface texture. As described above, the present invention can easily and accurately observe the surface texture of the ultra low carbon steel by appropriately controlling the composition of the etching solution and the etching conditions of the ultra low carbon steel using the same, and the effect of the reproducibility of the etching structure is high.
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| KR101656476B1 (en) * | 2015-09-04 | 2016-09-12 | 재단법인 포항산업과학연구원 | Etchant for microstructure analysis for ferritic steels, manufacturing method thereof and method of etching |
| CN115931516B (en) * | 2022-10-18 | 2024-04-19 | 新余钢铁股份有限公司 | Color coloring agent for metallographic structure in cold-rolled dual-phase steel and coloring method thereof |
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