KR100936348B1 - High corrosion resistance surface treatment solution fostering material of low chromium stainless steel and passcivity treatment method of stainless steel by using the fostering material - Google Patents
High corrosion resistance surface treatment solution fostering material of low chromium stainless steel and passcivity treatment method of stainless steel by using the fostering material Download PDFInfo
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Abstract
본 발명은 크롬함량이 18% 미만인 저크롬 함량 스테인레스강의 산세에 있어서 산세처리후 최종 제품의 표면에 부동태 층의 형성이 부족하여 발생될 수 있는 부식현상을 현저히 감소시킬 수 있는 표면처리용액 조성물에 관한 것으로, 니켈이 함유되지 않고 크롬함량이 적은 페라이트계 혹은 마르텐사이트계 스테인레스강을 통상의 열처리와 산세과정을 거친 다음 최종적으로 표면에 잔류할 수 있는 메탈 철 및 철, 크롬, 실리콘, 망간 등의 산화물을 제거하고 표면에 부동태 피막을 형성시켜줌으로써 표면보호특성이 강한 용액 조성물로서, 스테인레스강의 모재손상을 최소화하기 위해 불산의 활동을 억제시키면서 부동태를 형성하는 조성물을 제공하는 것이다. The present invention relates to a surface treatment solution composition which can significantly reduce corrosion which may occur due to the lack of formation of a passivation layer on the surface of a final product after pickling in the pickling of low chromium content stainless steel having a chromium content of less than 18%. Ferritic or martensitic stainless steel containing no nickel and containing less chromium is subjected to the usual heat treatment and pickling process, and the oxides such as metal iron and iron, chromium, silicon, and manganese that can remain on the surface. As a solution composition having a strong surface protection property by removing and forming a passivation film on the surface, to provide a composition that forms a passivation while suppressing the activity of hydrofluoric acid in order to minimize damage to the base metal of stainless steel.
본 발명에 따르면 밝은 백색의 제품을 얻을 수 있으며, 장기간 보관하여도 표면에 녹이 발생되지 않는 특성을 가짐으로써, 우수한 품질의 스테인레스강을 생산할 수 있으며, 녹 방지를 위해 방청제와 같은 별도의 화학약품 사용이 필요 없어 공정을 단순화하고 품질을 획기적으로 향상시키는 효과를 얻을 수 있다.According to the present invention, a bright white product can be obtained, and since it has a property of not causing rust on the surface even after long-term storage, it can produce stainless steel of excellent quality and uses a separate chemical agent such as a rust preventive agent to prevent rust. This eliminates the need to simplify the process and dramatically improve quality.
페라이트, 마르텐사이트, 부동태, 표면처리, 스테인레스 Ferrite, Martensitic, Passive, Surface Treatment, Stainless
Description
본 발명은 크롬 함량이 적어 스테인레스강 고유의 견고한 부동태층을 형성하기 어려운 저크롬 함유 스테인레스강의 부동태 형성 방법에 관한 것으로, 크롬함량이 18% 미만인 저크롬 함량 스테인레스강의 산세에 있어서 산세처리후 최종 제품의 표면에 부동태 층의 형성이 부족하여 발생될 수 있는 부식현상을 현저히 감소시킬 수 있는 표면처리용액 조성물에 관한 것이다. The present invention relates to a passivation method of low chromium-containing stainless steel having a low chromium content and difficult to form a rigid passivation layer inherent to stainless steel. It relates to a surface treatment solution composition that can significantly reduce the corrosion phenomenon that can occur due to the lack of the passivation layer formed on the surface.
보다 자세하게는 니켈이 함유되지 않고 크롬함량이 적은 페라이트계 혹은 마르텐사이트계 스테인레스강을 통상의 열처리와 산세과정을 거친 다음 최종적으로 표면에 잔류할 수 있는 메탈 철 및 철, 크롬, 실리콘, 망간 등의 산화물을 제거하고 표면에 부동태 피막을 형성시켜줌으로써 표면보호특성이 강한 용액 조성물에 관한 것으로, 스테인레스강의 모재손상을 최소화하기 위해 불산의 활동을 억제시키면서 부동태를 형성하는 조성물을 제공하는 것이다.More specifically, ferritic or martensitic stainless steel containing no nickel and low chromium content is subjected to the normal heat treatment and pickling process, and finally, such as metal iron and iron, chromium, silicon, and manganese, which may remain on the surface. The present invention relates to a solution composition having strong surface protection characteristics by removing an oxide and forming a passivation film on a surface thereof, and to provide a composition which forms a passivation while suppressing the activity of hydrofluoric acid to minimize base metal damage of stainless steel.
이를 위해 통상의 산세용액인 불산, 황산, 과산화수소 혹은 불산, 질산을 사 용하는 대신에 붕불산, 인산, 과산화수소와 첨가제를 사용하여 불산의 침투현상을 최소화하고 표면을 인산염에 의해 보호하면서 스테인레스 고유의 부동태 피막을 형성할 수 있게 하는 용액 조성물에 관한 것이다. For this purpose, instead of using the usual pickling solution, hydrofluoric acid, sulfuric acid, hydrogen peroxide, hydrofluoric acid, or nitric acid, boric acid, phosphoric acid, hydrogen peroxide and additives are used to minimize the penetration of hydrofluoric acid and protect the surface by phosphate, and The present invention relates to a solution composition capable of forming a passivation film.
본 발명에 따르면 밝은 백색의 제품을 얻을 수 있으며, 장기간 보관하여도 표면에 녹이 발생되지 않는 특성을 가짐으로써, 우수한 품질의 스테인레스강을 생산할 수 있으며, 녹 방지를 위해 방청제와 같은 별도의 화학약품 사용이 필요 없어 공정을 단순화하고 품질을 획기적으로 향상시키는 효과를 얻을 수 있다.According to the present invention, a bright white product can be obtained, and since it has a property of not causing rust on the surface even after long-term storage, it can produce stainless steel of excellent quality and uses a separate chemical agent such as a rust preventive agent to prevent rust. This eliminates the need to simplify the process and dramatically improve quality.
부동태층이라 함은 스테인레스강의 조성물 중에 크롬은 그 산화물의 구조가 치밀하여 표면에 크롬산화물이 분포할 경우 하부로 산소의 침입을 방지하게 되어 더 이상 산화가 일어나지 않아 녹이 슬지 않는 영역을 가지는데, 이 크롬 산화물 층을 부동태 층이라고 한다.In the passivation layer, chromium in the composition of stainless steel has a structure where the oxide structure is dense and chromium oxide is distributed on the surface to prevent oxygen from invading to the lower side, and thus, oxidation does not occur anymore and thus has a region that does not rust. The chromium oxide layer is called a passivation layer.
반면, 일반 철의 산화물은 그 구조가 엉성하여 산소가 계속 침투함으로써 녹이 지속적으로 발생하게 되며, 이러한 강종이 탄소강이며, 이의 방지를 위해 대체로 도색을 하거나 도금을 하여 사용하는 경우가 많다. 스테인레스강에서는 일반적으로 크롬의 함량이 13% 이상이면 부동태층의 형성이 시작되며, 18% 이상에서 완전한 부동태층이 형성되어 고 내식성의 스테인레스강이 될 수 있다. 오스테나이트 계열의 스테인레스강은 대부분 18% 이상의 크롬과 추가로 니켈을 함유하여 내식성이 강한 스테인레스 강을 형성하지만, 니켈의 가격이 비싸므로 니켈을 제외시킨 강 종이 마르텐사이트 혹은 페라이트 강종이다. 이는 통상 400계 강종으로 불리우며, 니켈이 없을 뿐만 아니라 크롬의 함량도 비교적 낮아 완전한 부동태 층의 형성이 어려운 강종이다. On the other hand, the oxide of the general iron is poor in structure, the oxygen continues to penetrate the rust is generated continuously, this type of steel is carbon steel, in order to prevent it is usually used by painting or plating. In stainless steel, the formation of the passivation layer is generally started when the chromium content is 13% or more, and a complete passivation layer may be formed at 18% or more to become a high corrosion resistant stainless steel. Most austenitic stainless steels contain more than 18% of chromium and additional nickel to form corrosion resistant stainless steels. However, nickel is excluded from martensite or ferritic steels because nickel is expensive. It is commonly referred to as a 400-based steel grade, and it is difficult to form a complete passivation layer because it has no nickel and has a relatively low chromium content.
크롬함량이 낮은 스테인레스강에 대한 부동태층의 형성 방법으로 종래기술에는 전통적으로 사용되고 있는 질산과 불산의 혼산에 의한 산세처리가 가장 일반적이다. 이 경우는 질산이 산화제로 작용하여 표면의 산화스케일을 제거함과 동시에 모재의 크롬에 미세하고 치밀한 크롬 산화층을 형성시켜줌으로써 부동태층을 잘 형성시킬 수 있다. 그러나 질산을 사용하는 방법은 대기중으로 과도한 NOx 가스의 발생과 폐수로 총질소를 배출하게 되어 환경적으로 많은 문제점을 야기시킨다. 따라서 최근에는 질산을 사용하지 않는 산세용액을 많이 채택하고 있는 실정이다. (US5154774, US5354383, 대한민국특허 0549864) As a method for forming a passivation layer for stainless steel having a low chromium content, the pickling treatment using a mixture of nitric acid and hydrofluoric acid, which is conventionally used in the prior art, is most common. In this case, nitric acid acts as an oxidant to remove the scale of oxidation on the surface and at the same time to form a fine and dense chromium oxide layer on the chromium of the base material can form a passivation layer well. However, the use of nitric acid causes a lot of environmental problems due to the generation of excess NOx gas into the atmosphere and the discharge of total nitrogen into the wastewater. Therefore, a lot of pickling solutions that do not use nitric acid in recent years. (US5154774, US5354383, Korea Patent 0549864)
그러나, 질산을 사용하지 않는 경우에는 불산의 과도한 용해 성질을 잘 조절하기 힘들어 과도한 에칭이 일어나 크롬함량이 낮은 강종의 경우 표면에 철 성분이 대부분 노출되게 되며, 이 경우 부동태층의 형성을 방해하여 장기보관시 녹이 발생하는 문제를 야기하게 된다. 따라서 별도의 부동태 처리를 수행하는 경우가 대부분이다. However, when nitric acid is not used, it is difficult to control excessive dissolution properties of hydrofluoric acid so that excessive etching occurs, and most steels with low chromium content expose the iron component to the surface. It causes the problem of rust when stored. Therefore, most passivation processes are performed separately.
별도의 부동태 처리용액으로는 중크롬산이나 과망간산칼륨과 같은 강 산화제를 사용하는 경우(대한민국특허 0321619)나 질산을 추가로 사용하는 방법 (대한민국 특허공개 2004-0094401), 혹은 불산 대신 규불화소소산과 황산 과산화수소 등의 불산화합물을 사용하는 방법 (JP 공표번호 2006-503182)이 알려져 있다. As a separate passivating solution, a strong oxidizing agent such as dichromic acid or potassium permanganate may be used (Korean Patent 0321619) or an additional method of using nitric acid (Korean Patent Publication No. 2004-0094401), or hydrofluoric acid and sulfuric acid peroxide instead of hydrofluoric acid. A method of using a hydrofluoric acid compound (JP Publication No. 2006-503182) is known.
그러나 이러한 경우 중크롬산이나, 과망간산칼륨은 중금속의 배출원이며, 폐수처리시 색깔을 나타내는 등의 부작용이 있으며, 규불화수소산을 사용하는 경우는 에칭력이 현저하게 감소하여 전단 산세처리 과정에서 조금의 미처리된 표면이 있어도 그 부분의 산화스케일을 완전히 제거하지 못하여 여전히 녹이 발생할 수 있는 여지를 내포하고 있다. 단지 표면을 백색으로 희게 하는 데에는 효과적인 방법이다. However, in this case, dichromic acid or potassium permanganate is a source of heavy metals, and there are side effects such as coloration in wastewater treatment. When hydrofluoric acid is used, the etching power is significantly decreased, and thus some untreated in the shear pickling process. Even if the surface is present, the oxidation scale of the part is not completely removed, and there is still room for rust. It is an effective way to only whiten the surface white.
또한 상기 특허에서 다양한 종류의 불소화합물을 대상으로 개발을 시도하였으나, 규불화 수소산을 가장 우수한 종류로 선택하였으며, 기타의 조성에 대해서는 자세한 검토가 제외 되었다. 특허 청구의 범위에서는 주기율표상의 합성 가능한 모든 조성물을 대상으로 특허를 청구하였으나, 각 조성물에 대한 세부적인 조건과 장단점은 제시하지 못하고 있다. 그 외의 방법은 대부분 전기를 이용한 전해산세방법으로 이 경우에는 고가의 설비가 필요하며, 특정 제품인 경우 적용이 곤란한 기술이다.In addition, although the patent attempted to develop various kinds of fluorine compounds, hydrofluoric acid was selected as the best type, and other compositions were excluded from the detailed review. In the claims, patents have been filed for all synthesizable compositions on the periodic table, but detailed conditions and advantages and disadvantages for each composition are not disclosed. Most of the other methods are electrolytic pickling methods using electricity. In this case, expensive facilities are required, and in the case of a specific product, this technique is difficult to apply.
이에, 본 발명은 상술한 바와 같은 종래의 문제점을 개선시키기 위한 것으로 그 목적은, 저크롬함유 스테인리스강 제품에 대하여 표면의 부동태 층을 견고하게 하고 표면을 미려하게 하는 세정용액의 조성물을 제공하는데 있다.Accordingly, the present invention is to improve the conventional problems as described above, the object of the present invention is to provide a composition of a cleaning solution to strengthen the passivation layer of the surface of the low chromium-containing stainless steel product and to make the surface beautiful .
본 발명은 니켈이 함유되지 않고 크롬함량이 적은 페라이트계 혹은 마르텐사이트계 스테인레스강을 통상의 열처리와 산세과정을 거친 다음 최종적으로 표면에 잔류할 수 있는 메탈 철 및 철, 크롬, 실리콘, 망간 등의 산화물을 제거하고 표면에 부동태 피막을 형성시켜줌으로써 표면보호특성이 강한 용액 조성물로서, 스테인레스강의 모재손상을 최소화하기 위해 불산의 활동을 억제시키면서 부동태를 형성하는 조성물을 특징으로 한다.According to the present invention, ferritic or martensitic stainless steel containing no nickel and having a low chromium content may be subjected to the usual heat treatment and pickling process, and finally, such as metal iron and iron, chromium, silicon, and manganese. A solution composition having strong surface protection properties by removing oxides and forming a passivation film on the surface, characterized by a composition which forms a passivation while suppressing the activity of hydrofluoric acid in order to minimize the base metal damage of stainless steel.
본 발명에 따르면, 스테인리스 제품 특히 부동태 층 형성이 어려운 저 크롬강의 제품에 대해 안정적인 부동태 층을 짧은 시간에 형성할 수 있게 됨으로써, 미려한 제품을 생산할 수 있을 뿐만 아니라 장기간의 보관에도 녹이 쉽게 발생하지 않는 안정적인 내식성을 확보한 제품의 생산이 가능하여 제품의 품질과 생산성을 동시에 향상할 수 있는 효과가 있다. 또한, 부가적인 효과로 용액의 발열반응이 적으며, 실리콘이 다량 포함된 용액을 사용하지 않아 산성산화물인 실리콘 산화물이 형성되는 것을 방지하여 용액의 수명을 현저하게 연장할 수 있는 경제적인 이점도 포함하고 있다.According to the present invention, it is possible to form a stable passivation layer in a short time for stainless steel products, especially low chromium steel products difficult to form a passivation layer, thereby producing a beautiful product as well as stable rust does not easily occur in long-term storage It is possible to produce products that have corrosion resistance, thereby improving the product quality and productivity at the same time. In addition, the effect of the exothermic reaction of the solution is less as an additional effect, and does not use a solution containing a large amount of silicon to prevent the formation of acid oxide silicon oxide, and also includes an economic advantage that can significantly extend the life of the solution have.
상기와 같은 목적을 달성하기 위하여 본 발명은, 붕불산 10~50g/L, 불산 1~10g/L, 인산 1~50g/L 및 과산화수소 2~40g/L 와 인히비터로 NaMoO4 (몰리브덴산 나트륨) 0.1~5g/L 및 과산화수소 안정제로 페닐우레아(Phenyl Urea) 0.1~5g/L가 포함된 부동태 용액 조성물을 제공한다. In order to achieve the above object, the present invention provides a solution of NaMoO 4 (sodium molybdate) with 10 to 50 g / L boric acid, 1 to 10 g / L hydrofluoric acid, 1 to 50 g / L phosphoric acid, and 2 to 40 g / L hydrogen peroxide. ) 0.1 to 5 g / L and a hydrogen peroxide stabilizer to provide a passive solution composition containing 0.1 to 5 g / L Phenyl Urea (Phenyl Urea).
본 발명의 조성물에 의해서 표면의 과도한 에칭을 붕불산이 방지하며, 산화스케일은 불산에 제거하고 부동태 층은 과산화수소가 형성하고, 표면보호를 인산과 인히비터가 수행하며, 과산화수소의 자체 분해를 안정제가 방지하여 용액의 수명이 길고 제품의 품질이 우수한 특성을 나타낼 수 있다. With the composition of the present invention, boric acid prevents excessive etching of the surface, the oxide scale is removed in the hydrofluoric acid, the passivation layer is formed by hydrogen peroxide, the surface protection is performed by phosphoric acid and the inhibitor, and the self-decomposition of hydrogen peroxide is stabilized. The long life of the solution and the excellent quality of the product can be exhibited.
붕불산의 농도가 너무 낮으면 불산의 활동도가 증가하고 용해된 메탈 이온을 잘 흡수하지 못하여 과도한 에칭의 원인이 되며, 농도가 과도하면, 붕불산에서 유래된 불산성분이 증가하여 역시 동일한 불이익을 초래한다. 인산의 경우 농도가 낮으면 표면 보호역할을 수행할 수 없으며, 농도가 높으면, 과도한 비용과 산도를 높여 표면 과에칭의 원인이 된다. 또한 인히비터의 농도는 적을 경우 표면을 손상시키고 과도하면 세정시간을 오래 필요로 하게 된다. 과산화수소의 농도는 적은 경우 부동태를 형성하지 못하며, 과도할 경우 고가의 과산화수소 소모량이 늘어나게 된다. 안정제 역시 부족할 경우 과산화수소의 분해가 촉진되어 용액의 수명이 단축되며, 과도할 경우 표면 부동태를 방해하게 된다.If the concentration of boric acid is too low, the activity of hydrofluoric acid is increased and it is difficult to absorb the dissolved metal ions, causing excessive etching. If the concentration is excessive, the hydrofluoric acid derived from boric acid is increased, which also causes the same disadvantage. Cause. In the case of phosphoric acid, a low concentration can not act as a surface protection role, while a high concentration causes excessive surface cost and acidity by causing excessive surface etching. In addition, if the concentration of inhibitor is small, the surface is damaged, and if excessive, the cleaning time is long. If the concentration of hydrogen peroxide is small, it does not form a passivation, and if excessive, the consumption of expensive hydrogen peroxide increases. In the absence of a stabilizer, the decomposition of hydrogen peroxide is promoted, which shortens the life of the solution, and when excessive, disturbs the surface passivation.
본 발명의 작용은 상기 용액의 조성물을 조성하여 스테인레스강을 침적시키거나, 용액을 제품에 스프레이 하여 표면을 처리할 수 있으며, 처리후 세정 작업을 통해 미려한 표면의 제품을 확보할 수 있다. 또한 용액의 수명을 연장하기 위하여 상기 용액중에 부족한 성분을 추가로 첨가하여 지속적으로 사용할 수 있으며, 수명이 완전히 다하는 경우는 용액중에 용해되어 있는 메탈 이온의 농도가 총 60g/L를 초과하면 더 이상의 성능을 발휘하지 못하여 폐기처분 하여야 한다. 용액의 수명 연장을 위해 불산을 지속적으로 첨가할 수 있으며, 과산화수소는 용액의 산화환원전위를 400mV (Pt, Ag/AgCl 상대전극 기준) 이상 유지하는 조건에서 지속 혹은 간헐 투입하면서 사용이 가능하다. 제품의 부동태층 형성 여부는 ASTM a308에 기재되어 있는 Ferroxyl Test 용액으로 제품의 표면을 검사하여 푸른색의 발색이 일어나지 않아야 하며, 푸른색의 변색이 있으면, 부동태 층의 형성이 완전하지 못함을 나타낸다. The action of the present invention is to form a composition of the solution to deposit the stainless steel, or spray the solution to the product to treat the surface, it is possible to secure a beautiful surface product through the cleaning operation after the treatment. In addition, in order to extend the life of the solution, it is possible to continue to use the addition of the insufficient components in the solution, if the lifetime is over, if the concentration of metal ions dissolved in the solution exceeds 60g / L total performance It must be disposed of because it cannot be used. Hydrofluoric acid can be added continuously to extend the life of the solution. Hydrogen peroxide can be used continuously or intermittently under the conditions of maintaining the redox potential of the solution above 400mV (Pt, Ag / AgCl counter electrode). The formation of the passivation layer of the product shall be performed by examining the surface of the product with the Ferroxyl Test solution described in ASTM a308, and the color development of blue should not occur.
이하 본 발명의 효과를 실시예를 통해 보다 자세히 설명한다. Hereinafter, the effects of the present invention will be described in more detail with reference to Examples.
실시예 1Example 1
본 발명의 조성물에 의한 제품의 품질 평가를 위하여 표 1에서와 같은 조성물을 조성하고, 비교예로 JP 공표번호 2006-503182에 의한 조성물과 통상의 방법인 질산 4% 용액을 함께 검토하였다. 실시 방법은 스테인레스 416 강종의 선재 7mm 두께, 길이 10cm의 제품을 구입하여 통상의 산세절차인 용융염 처리, 황산 전처리 및 황산, 불산, 과산화수소에 의한 산세처리를 실시한 다음 세정하여 최종 부동태 처리액의 처리를 위한 시료로 준비하고, 각각의 용액에 제품을 침적하여 그 표면을 분석하여 보았다. 침적 시간은 2분가 4분으로 나누어 처리하여 보았으며, 장기간 의 효과를 알아보기 위하여 반복시험도 수행하였다. 도 1에는 각 시료의 1분, 2분 처리후의 제품의 표면을 사진으로 나타내었다. 도 1에서 보면 본 발명의 경우가 확연히 밝은 백색의 표면을 나타내고 있음을 알 수 있으며, 비교예 2에서의 통상의 방법인 질산에 의한 방법도 비교적 양호한 결과를 보였다. 그러나 비교예 1에서는 어두운 표면을 보이고 있다. 다음으로 도 2에는 표면의 부동태 층 형성 상태를 보여주는 Ferroxyl test를 실시한 결과를 나타내었다. 비교예 2에서만 푸른 색으로 변색이 일어나 제품 표면의 부동태 층이 형성되지 못하였음을 잘 알 수 있다. 도 3에는 여러회 반복하여 동일한 방법으로 표면처리를 하였을 경우의 제품 비교사진을 나타내었다.(3a는 본 발명, 3b는 비교예 1) 비교예 2는 질산을 사용하여 환경문제가 존재하므로 비교대상에서 제외하였다. 사진에서 보듯이 본 발명의 경우가 제품의 품질 편차가 현저히 적고 밝고 흰 표면을 얻을 수 있음을 확인할 수 있다.In order to evaluate the quality of the product by the composition of the present invention, a composition as shown in Table 1 was prepared, and as a comparative example, the composition according to JP Publication No. 2006-503182 and a 4% nitric acid solution which is a conventional method were examined together. The method is to purchase products of 7mm thick and 10cm long wire rods of stainless steel 416, which is a normal pickling procedure, molten salt treatment, sulfuric acid pretreatment and pickling treatment with sulfuric acid, hydrofluoric acid and hydrogen peroxide. Prepared as a sample for, and the product was immersed in each solution to analyze the surface. Immersion time was divided into 2 minutes and 4 minutes, and repeated tests were conducted to determine the long-term effects. In FIG. 1, the surface of the product after 1 minute and 2 minutes of each sample is shown by the photograph. It can be seen from FIG. 1 that the case of the present invention clearly shows a bright white surface, and the method using nitric acid, which is a common method in Comparative Example 2, also showed a relatively good result. However, Comparative Example 1 shows a dark surface. Next, Figure 2 shows the results of the Ferroxyl test showing the state of the passivation layer formed on the surface. It can be seen that the color change to blue color only in Comparative Example 2 did not form the passivation layer of the product surface. Figure 3 shows a photograph of the product comparison when the surface treatment was repeated several times in the same method. (3a is the present invention, 3b is Comparative Example 1) Comparative Example 2 is because the environmental problems exist using nitric acid Excluded from As shown in the photo, it can be seen that the case of the present invention can obtain a bright and white surface with a markedly low quality deviation of the product.
실시예 2Example 2
본 발명에 의한 효과를 좀더 정량적으로 알아보기 위하여 Potentio stat 장비를 이용하여 전위에 따른 전류변화를 측정하였다. 그 결과는 도 4에 나타내었다. 이 경우 저 크롬강인 416 강종과 함께 고 크롬강인 304M 강종도 함께 비교하였다. 도 4에서 전류밀도의 변화가 적으면서 평평한 면이 많이 나타날수록 부동태 층의 형성이 잘 되었다는 것을 나타내는데, 본 발명의 경우가 비교예 1에서보다 훨씬 안정적인 부동태 층을 형성함을 잘 확인할 수 있다.In order to determine the effect of the present invention more quantitatively, the current change according to the potential was measured using Potentio stat equipment. The results are shown in FIG. In this case, 416 steel grades, which are low chromium steels, and 304M steel grades, which are high chromiums, were also compared. 4 shows that the formation of the passivation layer is better as the flat surface appears with less change in current density, but it can be seen that the case of the present invention forms a much more stable passivation layer than in Comparative Example 1.
도 1은 본 발명과 비교예에 의한 1분 및 2분간 처리된 제품의 표면 형상을 나타낸 사진 1 is a photograph showing the surface shape of the product treated for 1 minute and 2 minutes according to the present invention and a comparative example
도 2는 1분간 처리된 제품의 Ferroxyl Test (ASTM a308) 결과 비교 사진Figure 2 is a photograph comparing the results of Ferroxyl Test (ASTM a308) of the product treated for 1 minute
도 3은 본 발명과 비교예의 조성물에 의한 여러 번 반복 실험에 의한 제품의 표면 품질 사진Figure 3 is a photograph of the surface quality of the product by repeated experiments with the composition of the present invention and the comparative example
도 4는 Potentio Stat장비를 이용한 본 발명과 비교예에 의한 제품의 전해특성 곡선Figure 4 is the electrolytic characteristic curve of the product according to the present invention and the comparative example using the Potentio Stat equipment
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013119062A1 (en) * | 2012-02-08 | 2013-08-15 | 주식회사 호진플라텍 | Copper plating solution |
KR101327187B1 (en) * | 2013-07-24 | 2013-11-06 | 손경업 | Descaling and passive state processing composition for stainless steel and descaling method of stainless steel using the same |
KR101718478B1 (en) | 2016-06-01 | 2017-03-21 | (주)천우테크 | A Netural compound passivated for the surface of stainless steel |
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JPS6320494A (en) | 1986-07-14 | 1988-01-28 | Mitsubishi Heavy Ind Ltd | Method for chemically cleaning surface of stainless steel |
JPH04304391A (en) * | 1991-03-29 | 1992-10-27 | Itb Srl | Method of pickling stainless steel without using nitric acid and passivating stainless steel |
KR20050064514A (en) * | 2003-12-24 | 2005-06-29 | 재단법인 포항산업과학연구원 | Composition of nitric acid free pickling solution for stainless steel |
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JPS6320494A (en) | 1986-07-14 | 1988-01-28 | Mitsubishi Heavy Ind Ltd | Method for chemically cleaning surface of stainless steel |
JPH04304391A (en) * | 1991-03-29 | 1992-10-27 | Itb Srl | Method of pickling stainless steel without using nitric acid and passivating stainless steel |
KR20050064514A (en) * | 2003-12-24 | 2005-06-29 | 재단법인 포항산업과학연구원 | Composition of nitric acid free pickling solution for stainless steel |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013119062A1 (en) * | 2012-02-08 | 2013-08-15 | 주식회사 호진플라텍 | Copper plating solution |
US9150977B2 (en) | 2012-02-08 | 2015-10-06 | Hojin Platech Co., Ltd. | Copper plating solution |
KR101327187B1 (en) * | 2013-07-24 | 2013-11-06 | 손경업 | Descaling and passive state processing composition for stainless steel and descaling method of stainless steel using the same |
KR101718478B1 (en) | 2016-06-01 | 2017-03-21 | (주)천우테크 | A Netural compound passivated for the surface of stainless steel |
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