고도정수처리용 콘크리트 금속용사 피막의 내오존성 및 오존처리 후 부착강도 평가에 관한 실험적 연구

박진호,장현오,이한승 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 논문집 Vol.22 No.4

The introduction of advanced water treatment facilities has increased as the conventional purification method cannot remove the substance clearly. However, the internal waterproofing and Anticorrosion materials of the advanced water treatment facility using ozone deteriorate due to the oxidation power of ozone and affects the concrete, which causes a decrease in durability. This study is to evaluate the ozone resistance according to the type of spray metal and the surface treatment method of the coating, and the bond strength after ozone treatment in order to develope a finishing method to prevent deterioration of concrete structure of water treatment facility using metal spraying method as a way to construct metal panel with excellent ozone resistance and chemical resistance by an easier way than the previous. The Experimental results show that spray metal Ti has superior ozone resistance even after spraying. It is considered to be the most suitable method for ozone resistance and bond performance by finishing using Teflon sealing as surface treatment method. 기존의 정수처리 방법으로는 제거되지 않는 물질이 발생함에 고도정수 처리 시설의 도입이 증가하고 있다. 그러나 오존을 이용한 고도정수처리 시설의 내부 방수·방식재는 오존의 산화력에 의해 열화되며 콘크리트까지 영향을 미쳐 내구성 저하의 원인이 된다. 본 연구에서는 내오존성 및 내화학성이 뛰어난 금속 패널을 기존의 시공법 보다 손쉬운 방법으로 시공하기 위한 방법으로 금속용사 공법을 이용하여 수처리 시설 콘크리트 구조물의 열화를 원천적으로 방지하기 위한 마감공법 개발 연구의 일원으로 용사금속 종류 및 피막의 표면처리 방법에 따른 내오존성 평가를 실시하였으며, 오존처리 후의 부착강도를 평가하였다. 실험결과 용사금속 Ti이 용사 후에도 내오존성이 뛰어난 것으로 나타났으며 표면처리 방법으로는 테프론계 봉공처리제를 사용하여 마감하는 것이 내오존성 및 부착성능 확보에 가장 적합한 방법이라 판단된다.

수처리시설용 콘크리트의 금속용사 피막 종류에 따른 내오존성 및 전기화학적 방식 성능 평가

박진호,최현준,이한승,김상열,장현오 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 논문집 Vol.23 No.4

As the pollution of water resources deteriorates due to industrialization and urbanization, it is difficult to supply clean water through awater treatment method using chlorine. Therefore, the introduction of advanced water treatment facilities using ozone is on the increase. However,epoxy which is used as waterproofing and anticorrosives and stainless steel used in conventional waterproofing and anti-corrosive methods havedeteriorated because of the strong oxidizing power of ozone, causing problems such as leaking. Moreover, it even causes the durability degradationof a concrete. Therefore, in this study, metal spraying system was used as the means of constructing a metal panel with excellent ozone resistance andchemical resistance which is an easier method than an existing construction method. Ozone resistance was evaluated in accordance with the type ofmetal sprayed coatings to develop a finishing method which can prevent the concrete structure of water treatment facilities from deterioration. Furthermore, electrochemical stability in actual sewage treatment plant environment was evaluated. Experimental results showed that Ti has superiorozone resistance after spraying and the electrochemical stability in the sewage treatment plant environment showed that Ti has the highest polarizationresistance of 403.83 k ∙ Ω ⋅ cm 2, which ensures high levels of durability. 산업화, 도시화로 인해 수자원의 오염이 악화 되면서 기존에 염소를 이용한 정수처리 방법으로는 깨끗한 물을 공급하는데 어려운실정이다. 이에 오존을 이용한 고도정수 처리 시설의 도입이 증가하고 있다. 그러나 기존의 방수⋅방식 공법으로 사용되는 에폭시계 방수⋅방식제 및 스테인리스는 오존의 강력한 산화력으로 인해 열화되어 박리 등 문제 발생하였으며, 콘크리트까지 영향을 미쳐 내구성 저하의 원인이된다. 이에 따라 본 연구에서는 내오존성 및 내화학성이 뛰어난 금속 패널을 기존의 시공법 보다 손쉬운 방법으로 시공하기 위한 방법으로 금속용사 공법을 이용하여 수처리 시설 콘크리트 구조물의 열화를 원천적으로 방지하기 위한 마감공법 개발 연구의 일원으로 용사금속 종류 에 따른 내오존성 평가를 실시하였으며, 실제 하수처리장 환경에서의 전기화학적 안정성능 평가를 실시하였다. 실험결과 용사금속 Ti이 용사 후에도 내오존성이 뛰어난 것으로 나타났으며, 하수처리장 환경에서의 전기화학적 안정성능 평가 결과 용사금속 Ti가 403.83k∙ Ω∙cm2의 가장 높은 분극저항을 나타남으로써 높은 수준의 내구성을 확보하는 것을 확인할 수 있었다.

철근콘크리트 구조물에 Zn-Al 금속용사 전기방식 공법의 적용성에 관한 실험적 연구

한만해,유조형,임영철,이한승 한국건축시공학회 2010 한국건축시공학회지 Vol.10 No.5

희생양극방식은 지하구조물이나 해양환경하에서 구조물의 방식공법으로 소개되어지고 있다. 1970년대 이후, 희생양극방식이 철근콘크리트 구조물에 적용되어지고 있다. 희생양극방식은 전세계적으로 1990년대 이후 그 유효성을 검증되었다. 그러나, 희생양극방식은 시공적이나 경제적인 약간의 문제점을 가지고 있다. 그 문제점을 해결하기 위하여 고 내구성 금속을 용사시키는 희생양극방식이 개발되었다. 양극재(아연, 알루미늄)를 금속용사로 도포하여 실험체를 제작한 후, 실험체의 부식전류를 측정하여 양극재의 방식성능을 확인하였다. 실험결과 철근 콘크리트 구조물을 대상으로 금속용사를 이용한 희생양극방식이 우수한 방식성능을 가지는 것을 알 수 있었다. Cathodic Protection has been introduced as a method of protecting metals under the ground or sea from corrosion. Since 1970, it has been applied to reinforced concrete structures as a corrosion protection method. After 1990, it became used around the world, and its usability has been well confirmed. But this method has some problems in terms of construction and economy. To solve these problems, a Cathodic Protection Method using a highly-durable metal spray was developed. First, the specimen was covered with anodic materials (Zn, Al) by using metal spray. The corrosion protection performance was confirmed by measuring the corrosion current of the specimen. Through the experiment, it is possible to confirm that the Cathodic Protection Method using a high metal spray provides effective protection against corrosion to reinforced concrete structures.

용사 도막의 내식성에 관한 전기화학적 평가

문경만(Kyung-Man Moon),신중하(Joong-Ha Shin),이명훈(Myung-Hoon Lee),이성렬(Sung-Yul Lee),김윤해(Yun-Hae Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회지 Vol.34 No.4

가혹한 부식환경 하에 사용되어 지고 있는 다양한 강구조물에 대해서 많은 표면방식법이 있다. 그 중의 한방법인 용사는 다양한 강구조물의 표면방식을 위하여 비교적 최근에 개발된 유용한 방식법이다. 그러나 용사피막도 환경오염의 가속화에 따라 점차 더욱 좋은 내식성을 필요로 하고 있다. 본 연구에서는 아아크 용사에 의해서 도막두께 200㎛의 피막을 만들었으며, 피막의 종류는 순 아연,순 알류미늄, 합금피막(Al:Zn=85:15) 및 (Al:Zn=95:5)의 합금피막이었다. 그리고 이들 피막의 내식성을 해수용액에서 전기화학적인 방법으로 고찰 하였다. 순 알류미늄 피막은 다른 피막에 비해서 비교적 상당히 좋은 내식성을 보였다. 그리고 합금피막도 역시 순 아연피막에 비해서 좋은 내식성을 보였다. 특히 순 알류미늄 피막은 갈바륨 용사라고 알려진 합금피막(Al:Zn=85:15)보다 해수용액에서 내식성이 상대적으로 좋았음이 관찰되었다. 순 아연의 부식된 표면양상은 입게부식의 형태를 나타내었으나 순 알류미늄과 합금피막은 균일부식의 형태를 나타내었다. There are many surface protection methods for numerous steel structures being used under severely corrosive environment, one of them, metallizing(thermal spray) is a available protection method which is comparatively and recently developed for surrface protection of various steel structures. However coating film obtained by spraying is to be needed increasingly more good corrosion resistance due to accelerating of environmental contamination. In this study, coating films(DFT:200㎛) are performed with arc spray by wire metal and their types of films are pure zinc, pure aluminum, alloy film(Al:Zn=85:15) and alloy film(Al:Zn=95:5). And corrosion resistance of their films was investigated with electrochemical methods in seawater solution. Pure aluminum film showed a relatively somewhat good corrosion resistance compared to among those of other films and alloy films also showed a good corrosion resistance compared to pure zinc film. Especially it was observed that pure aluminum film showed a comparatively good corrosion resistance than that of alloy film named as galvarium spray(Al:Zn=85:15) in seawater solution. Morphology of corroded surface of pure zinc film appeared the pattern like intergranlar corrosion, however films of pure aluminum and alloy metal showed a general corrosion pattern.

고주파 아크 금속용사기를 이용한 금속용사 용사 코팅계의 부착강도 평가

최홍복 ( Hong Bok Choe ),이한승 ( Han Seung Lee ) 한국건축시공학회 2014 한국건축시공학회 학술발표대회 논문집 Vol.14 No.1

The purpose of this study is to analyze the adhesion strength of metal spray coating system in steel using high-frequency arc metal spray method. For the purpose the experimental factor such as surface roughness was selected at 3 levels. As a result of experiment, it appeared that high-frequency arc metal spray method had higher adhesion strength than existing metal spray method. Especially, Al-Mg showed the highest adhesion strength than other metals. In case of surface roughness, the higher roughness steel has, the higher adhesion strength appeared.

금속피막에 의한 건축 마감 의장 기법 개발에 관한 연구

임지택,정화랑 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 논문집 Vol.22 No.1

In this study, the bond strength between concrete and metal films was investigate according to changing water content ratio of substrate concrete by pull-out test in order to develop the new finishing design methods for building structures using the metal films. The following conclusions were obtained as a result of the studies. It was find that the colour of metal did not change before and after the metal spraying. Also, the water content ratio of substrate concrete must be controlled under 10% weight to confirm the standard bond strength of finishing material to concrete. 2.5 MPa. To enhance the bond strength between concrete and metal films, it is very effective to strengthen the concrete surface using the agent which strengthen the concrete surface and seal the pore of metal film by the sealing agents. Therefore, the control of concrete surface treatment and water content ratio are necessary to secure the bond strength of metal films. 본 연구에서는 용사기법에 의해 콘크리트 표면에 금속피막을 형성하는 새로운 마감 의장기법의 가능성을 검토하기 위하여, 콘크리트의 함수율 변화에 따른 금속피막의 부착성능에 대하여 실험적인 연구를 수행하였다. 그 결과, 선재의 색은 용사 후에도 변하지 않는 것을 알 있었고, 콘크리트 부착강도 기준인 2.5 MPa를 확보하기 위한 하지 콘크리트의 함수율을 10% 이하로 관리하면 금속피막의 부착강도눈 확보되는 것으로 판단된다. 또한, 콘크리트와 금속피막의 부착강도를 증진시키기 위해서는 표면강화제에 의한 콘크리트 표면강화와 함께 금속피막을 봉공처리제로 봉공하는 것이 매우 유효한 것을 알 수 있었다.

콘크리트 표면처리 방법이 용사금속과 콘크리트와의 부착성능에 미치는 영향에 관한 실험적 연구

정성호(Jung Sung-Ho) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.2

The purpose of this study is to evaluate the adhesion property experimentally between spraying metal and concrete surface using thermal metal spray system which was applied to high corrosion protective system in steel structures. In the experiment, the pull-out test was conducted to investigate the adhesion property between spraying metal and concrete surface variable of treatment method of concrete surface. As a result, it was confirmed that the sanding blast and brush grinding to make rugged surface and the spraying strengthening agent as a treatment method of concrete surface was very effective to enhance the adhesion property. Also, it was confirmed that the water content of concrete, strength of concrete, a kind of spray metal and the thickness of spray metal was not almost affected to adhesion property.

용사된 도막의 내식성에 관한 전기화학적 평가

신중하(Joong-Ha Shin),오민석(Min-Seok Oh),이명훈(Myung-Hoon Lee),김윤해(Yun-Hae Kim),이성렬(Sung-Yul Lee),문경만(Kyung-Man Moon) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4

There are many surface protection methods for steel structures under severely corrosive environment, one of them, metallizing(thermal spray) is a available protection method which is comparatively and recently developed for surrface protection of various steel structures. However coating film obtained by spraying is to be needed increasingly more good corrosion resistance due to accelerating of environmental contamination. In this study, coating films(DFT:200㎛) are made with arc spray with wire metal both of pure zinc or aluminum and their alloy metals with some ratio(Al:Zn=85:15, 85:5). And corrosion resistance of their films is investigated with electrochemical methods in seawater solution. Pure aluminum film showed a somewhat good corrosion resistance among those of other films and good corrosion resistance was also observed at alloy films with some ratio compared to pure zinc film. Especially film of galvarium spray(Al:Zn=85:15) showed not good corrosion resistance than that of pure aluminum film in seawater solution. Morphology of corroded surface of pure zinc film appeared the pattern like intergranlar corrosion, however film of pure aluminum showed a general corrosion pattern.

플라즈마 용사에 의한 Al/AIN 복합재료의 제조

양경원,김창규  ,이종문,김민남 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-

Making Al composition in the base metal interface of spray coating film then after forming the inclination composition coation(the second-film) of AIN composition in the surface, holding a exfoliation of the coating film and trying to make Al/AIN complex-film contained a much of nitrides were obtained below result. As cooling of the base metal hold a thermal expansion of the base metal, it can know effected holding a exfoliation of coating film and not affected a bad effect to nitration reaction. According the spray distance was longer, the nitration reaction controled and the coating film was delicately formed. In case RF input power was 3㎾, coating film is very well formed. Following the increase of a flux of carrier gas, a thickness of coating film tended to decrease and as using the powder of diameter 3 ㎛ the best suitable situation was thought to powder supply of 31/min. the value of average hardness nearby the base metal interface was 45(Hv) and the value of average hardness nearby the surface of coating film was 5l4(Hv).

Cu계 금속을 용사한 콘크리트 벽체의 전자파 차폐 성능에 관한 연구

장종민 ( Jang Jong-min ),이한승 ( Lee Han-seung ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2

The ElectroMagnetic Pulse (EMP) destroys social infrastructure at once and causes social chaos. However, currently major infrastructures are constructed of concrete that does not have electromagnetic shielding performance. In this study, using the arc metal spraying method is used to evaluate the shielding performance and construction performance of concrete. The electro-magnetic shielding effect is measured by fabricating a shielding room with reference to MIL-STD-188-125, and the construction performance is evaluated by measuring the adhesion strength of thin metal sprayed film-concrete. As a result of the study, when the metal spraying method is applied, the shielding effect is higher than that of the special electro-magnetic shielding concrete, and it is considered to be more economical than the existing metal plate (3~5 mm).