KR20030025068A - A method for rising an anti-corrosion in dual alloy plating - Google Patents
A method for rising an anti-corrosion in dual alloy plating Download PDFInfo
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- KR20030025068A KR20030025068A KR1020010057991A KR20010057991A KR20030025068A KR 20030025068 A KR20030025068 A KR 20030025068A KR 1020010057991 A KR1020010057991 A KR 1020010057991A KR 20010057991 A KR20010057991 A KR 20010057991A KR 20030025068 A KR20030025068 A KR 20030025068A
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
- C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
-
- 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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/028—Including graded layers in composition or in physical properties, e.g. density, porosity, grain size
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
본 발명은 내식성이 우수한 합금의 도금층 수명향상방법에 관한 것이다.The present invention relates to a method for improving the plating layer life of an alloy having excellent corrosion resistance.
조선해양 분야의 해수용 강관은 용융아연도금(Galvanizing), 용융알루미늄도금(Aluminizing), PE(Polyethylene)코팅 등을 사용하여 해수중에서 내식성을 높이고 있다. 이중에서 용융 아연도금은 가격이 저렴하고 조선분야에서 널리 사용되고 있고, 용융알루미늄 및 PE 코팅의 경우, 내식성은 우수하나 상대적으로 가격이 고가이므로 제한적으로 사용하고 있다. 용융 알루미늄 도금의 경우는 물량이 불규칙하고 생산성이 낮아서 공기준수에 어려움이 많으며, PE의 경우 코팅층의 손상이 발생하지 않도록 별도로 관리해야 하므로 시공이 까다롭다.Seawater steel pipes in shipbuilding and offshore fields are using galvanizing, aluminizing, and PE (polyethylene) coatings to increase corrosion resistance in seawater. Among these, hot dip galvanizing is inexpensive and widely used in the shipbuilding field. In the case of molten aluminum and PE coating, corrosion resistance is excellent but relatively high price, so it is limitedly used. In the case of molten aluminum plating, the quantity is irregular and the productivity is low, so it is difficult to comply with the air, and in the case of PE, it is difficult to construct because it must be managed separately so as not to damage the coating layer.
해수배관의 경우 용융 알루미늄도금의 경우 약 10년, PE의 경우 20년(선박수명), 아연도금의 경우 5년 정도로 설계수명을 예상하지만 실제 아연도금 배관 수명이 2-3년 정도인 경우가 많다.In the case of seawater piping, the design life is expected to be about 10 years for molten aluminum plating, 20 years (ship life) for PE, and 5 years for zinc plating, but the actual service life of galvanized piping is often 2-3 years. .
알루미늄 도금이 아연도금보다 우수한 내식성을 나타내는 주요 원인은 알루미늄도금강의 전면부식속도가 아연도금강보다 늦기 때문이다. 따라서 아연에 알루미늄을 함유시켜 내식성을 높이고자 하는 시도가 있어왔다.The main reason that aluminum plating shows better corrosion resistance than zinc plating is that the front corrosion rate of aluminum plated steel is slower than that of galvanized steel. Therefore, there have been attempts to increase the corrosion resistance by containing aluminum in zinc.
Al-Zn 2원계 합금은 5%Al 부근에서 공정점을 나타내는 특성을 이용하여 저융점에서 작업이 가능하며 우수한 내식성을 가지는 합금도금이 시도되어 상용화된 것도 있다. 이것은 통상 갈판(Galfan)으로 부르고 있으며 5%정도의 Al과 미량의 회토류금속(La, Ce)을 함유한 Zn-5%Al 도금욕에서 도금을 실시한다. 이외에도 55%정도의 Al과 소량의 Si를 함유한 갈바륨(Galvalume)도 상용화되어 있으나 작업온도가 비교적 높다.Al-Zn binary alloys can be used at low melting points using properties that represent process points in the vicinity of 5% Al, and alloy plating with excellent corrosion resistance has been attempted and commercialized. This is usually called galfan and plating is performed in a Zn-5% Al plating bath containing 5% Al and traces of rare earth metals (La, Ce). In addition, galvalume containing 55% of Al and a small amount of Si is commercialized, but the working temperature is relatively high.
갈판의 용융 특성이 Zn과 유사하여 적용가능성이 높으나 전처리 단계에서 플럭스 고온 건조설비가 추가되어야 하며, 미도금이 자주 발생하는 외에도 해수중의 내식성 또한 검증되지 않았다.The melting characteristics of the brown plates are similar to those of Zn, which makes them highly applicable. However, flux hot-drying equipment must be added during the pretreatment stage. In addition to the frequent unplating, corrosion resistance in seawater has not been verified.
이중합금 도금시에는 취성이 강한 Zn-Al-Fe합금층이 형성되나, 굽힘등의 성형시에 도금층의 박리현상이 나타나는 문제가 발생한다.In the case of double alloy plating, a brittle Zn-Al-Fe alloy layer is formed, but a problem occurs in that the peeling phenomenon of the plating layer occurs during molding such as bending.
본 발명은 전술한 바와 같이 이중합금 도금시 도금층의 두께를 늘려 굽힘등의 성형시에 박리현상이 일어나지 않도록 하고 내식성을 향상시키고자 하는 목적을 가지고 있다.As described above, the present invention has an object to increase the thickness of the plating layer during double alloy plating so that peeling does not occur during molding such as bending, and to improve corrosion resistance.
본 발명은 전술한 목적을 달성하기 위하여 이중합금의 도금에 있어서, 440℃~ 500℃에서 용융아연도금 시간을 3분이상 실시후 아연 - 5%~15% 알루미늄 - 0~1% Si - 0~1% Mg 합금조에서 합금도금을 1분 실시하여 아연 도금층의 두께를 20㎛이상 형성하는 것을 특징으로 하는 이중합금 도금의 내식성 향상방법을 제공한다.In order to achieve the above object, the present invention, in the plating of the double alloy, after performing the hot dip galvanizing time at 440 ℃ ~ 500 ℃ for 3 minutes or more zinc-5% ~ 15% aluminum-0 ~ 1% Si-0 ~ The alloy plating is performed for 1 minute in a 1% Mg alloy bath to provide a method for improving the corrosion resistance of the double alloy plating, characterized in that to form a thickness of the galvanized layer 20㎛ or more.
이하 본 발명의 구성을 상세히 설명하면 다음과 같다.Hereinafter, the configuration of the present invention in detail.
이중 합금을 하는 공정은 탈지를 거쳐 산세, 수세후 플럭스를 바른후 융점이 420℃인 아연의 용융 아연도금을 460℃정도의 온도에서 한후 수세 공정을 거치는 통상의 용융아연 도금의 공정에서, 용융아연 도금된 상태에서 아연 - 5%~15% 알루미늄 - 0~1% Si - 0~1% Mg 합금조에 침적시킨다.In the process of double alloying, in the usual hot dip galvanizing process, degreasing, pickling and washing with water, flux is applied, hot dip galvanizing of zinc having a melting point of 420 ° C is performed at a temperature of about 460 ° C, and washing with water. In the plated state, it is deposited in zinc-5%-15% aluminum-0-1% Si-0-1% Mg alloy bath.
아연 도금후 합금도금을 실시하는 공정에서 합금층의 두께 증가는 아연 도금시에만 이루어지므로 아연 도금시간을 최대한 늘려서 합금층의 두께를 적어도 20㎛ 이상으로 만든 후 합금도금을 실시한다.In the process of alloy plating after zinc plating, the thickness of the alloy layer is increased only during zinc plating. Therefore, alloy plating is performed after making the thickness of the alloy layer at least 20 μm by increasing the zinc plating time as much as possible.
바람직한 실시예는 440℃~ 500℃에서 용융아연도금 시간을 3분이상 실시후 아연 - 5%~15% 알루미늄 - 0~1% Si - 0~1% Mg 합금조에서 합금도금을 1분 실시한다.In a preferred embodiment, the hot dip galvanizing time is performed at 440 ° C. to 500 ° C. for at least 3 minutes, followed by alloy plating in a zinc bath of 5% to 15% aluminum, 0% to 1% Si, and 0% to 1% Mg. .
합금도금을 할 경우에는 알루미늄의 용융점이 660℃로 아연보다 높으므로, 이미 철과 플럭스에 의하여 도금층이 형성된 아연의 상층이 아연과 알루미늄합금 용탕의 온도에 의하여 용융되어 아연 알루미늄 합금층이 형성된다. 따라서 첨가된 용융알루미늄의 농도에 따라 다양한 용융합금 피막이 형성된다.In the case of alloy plating, since the melting point of aluminum is higher than zinc at 660 ° C., the upper layer of zinc, in which a plating layer is already formed by iron and flux, is melted by the temperature of zinc and aluminum alloy molten metal to form a zinc aluminum alloy layer. Therefore, various molten alloy films are formed according to the concentration of molten aluminum added.
이상과 같이 본 발명은 용융 아연도금의 합금층에 비해 합금도금의 함금층은 10배 이상의 내식성을 가지므로 합금층 두께 증가에 의해 내식성이 향상된다.As described above, since the alloy layer of the alloy plating has a corrosion resistance of 10 times or more compared with the alloy layer of the hot dip galvanizing, the corrosion resistance is improved by increasing the thickness of the alloy layer.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020010057991A KR20030025068A (en) | 2001-09-19 | 2001-09-19 | A method for rising an anti-corrosion in dual alloy plating |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020010057991A KR20030025068A (en) | 2001-09-19 | 2001-09-19 | A method for rising an anti-corrosion in dual alloy plating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108463574A (en) * | 2015-12-24 | 2018-08-28 | Posco公司 | Alloy-coated steel plate and its manufacturing method |
| US11731397B2 (en) | 2015-12-24 | 2023-08-22 | Posco Co., Ltd | Alloy-coated steel sheet and manufacturing method therefor |
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2001
- 2001-09-19 KR KR1020010057991A patent/KR20030025068A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108463574A (en) * | 2015-12-24 | 2018-08-28 | Posco公司 | Alloy-coated steel plate and its manufacturing method |
| US11731397B2 (en) | 2015-12-24 | 2023-08-22 | Posco Co., Ltd | Alloy-coated steel sheet and manufacturing method therefor |
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