• Title/Summary/Keyword: Anticorrosive Property

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Evaluation Anticorrosive Properties of Corrosion Protective Organic Coatings by Electrochemical Impedance Spectroscopy (교류임피던스법에 의한 유기도막의 방식성 평가)

  • 박진환;이근대;전호환
    • Journal of the Society of Naval Architects of Korea
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    • v.41 no.1
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    • pp.88-93
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    • 2004
  • Electrochemical impedance spectroscopy was used to evaluate the anticorrosive properties of resin(alkyd, epoxy, urethane) and pigment(hydroxy apatite(HAp), zinc potassium chromate(ZPC). red lead(RL)). The corrosion behavior of coatings applied on steel has been investigated during exposure to 0.5M-NaCl The anticorrosive performances of resins were found to depend on their chemical nature and decreased in the order of urethane > epoxy > alkyd resin coating. Hydroxy apatite and zinc potassium chromate pigment which have property to passivate the substrate showed relatively high anticorrosive performance.

Evaluation of Anticorrosive Performance of Organic Coatings Subjected to Cyclic Wet-dry Exposure (흡 .탈수 반복 환경하에서의 유기도막의 방식성 평가)

  • 박진환;이근대;전호환
    • Journal of Ocean Engineering and Technology
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    • v.18 no.1
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    • pp.75-79
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    • 2004
  • Organic coatings are widely used to control of the corrosion of a steel structure. The water in coatings may cause the coatings to swell, leading to the degradation of the coatings. In addition, water affects the permeation of oxygen and other corrosive agents, and consequently, the presence of such substances at coating-metal interface promotes corrosion of the metal substrate. In this study, the anticorrosive properties of 4 types of coating, such as epoxy-epoxy, epoxy-urethane, urethane-epoxy, urethane-urethane, were evaluated. The evaluation tests were conducted under cyclic water-absorption/desorption conditions, consisting of alternative exposure to diluted 0.001M-LiCl(a$H_2O$≒1) and concentrated 10M-LiCl(a$H_2O$≒0.15). The anticorrosive performance of coatings was found to decrease in the order of urethane-urethane > urethane-epoxy > epoxy-epoxy coating.

흡.탈수 반복 환경에 있어서 유기도막의 방식성 평가

  • Park, Jin-Hwan;Lee, Geun-Dae;Jeon, Ho-Hwan
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2003.05a
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    • pp.262-268
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    • 2003
  • Organic coatings are widely used to control the corrosion of steel structure. The water in coatings may cause swelling or solvation of coatings, leading to the degradation of coatings. In addition, water affects the permeation of oxygen and other corrosive agents, and consequently the presence of such substances at coating-metal interface promotes corrosion of metal substrate. In this study, the anticorrosive properties of 4 types of coating, such as epoxy-epoxy, epoxy-urethane, urethane-epoxy, urethane-urethane, were evaluated. The evaluation tests were carried out under cyclic water-absorption/desorption conditions, consisting of alternative exposure to diluted 0.001M-LiCl($a_{1120}{\fallingdotseq}1$) and concentrated l0M-LiCl($a_{1120}{\fallingdotseq}0.05$). The anticorrosive performances of coatings were found to decrease in the order of urethane-urethane> urethane-epoxy> epoxy-epoxy coating.

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Development of 2000kW-50kHz induction heating equipment for galvannealed sheet steel (강판 합금화 용융아연도금용 2000kW-50kHz 유도가열 장치 개발)

  • Yoo, Hyo-Yol;Shim, Eun-Yong;Kang, Jae-Bong;Park, Hyoung-Jin;Yun, Hyoung-Jin;Yun, Hyoung-Min;Lim, Jin-Sup;Lee, Chan-Gyo
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.338-341
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    • 2008
  • Galvannealed Sheet Steel, which is being widely used in the automotive industry, is made by reheat after dip zinc galvanizing process. By this, A Fe-Zn alloy is created which enhance anticorrosive property and weldability. This paper describes basic design for 2000kW induction heating inverter system for galvannealling process and test result of 250kW inverter module which is used in parallel to form 2000kW inverter system.

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Preparation and Characterization of Muscovite Mica/UV Coating Materials for Steel

  • Cheong, In-Woo;Kim, Hyeon-Seok;Hwang, Dong-Seop;Yoo, Hye-Jin;Kim, Jin-Tae;Lee, Jae-Ryung
    • Corrosion Science and Technology
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    • v.9 no.6
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    • pp.265-269
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    • 2010
  • This paper describes the exfoliation and surface modification of muscovite mica for UV coating formulation. For the exfoliation of the mica, hydrothermal process was used in the presence of lithium nitrate ($LiNO_3$). After the cation exchange with $Li^+$ ions, the surface of the mica was modified with several amphiphilic substances to increase compatibility and storage stability in UV coating formulation. Such a hydrophobic surface modification affected colloidal stability as well as dispersibility of the exfoliated mica in UV coating solution. Anticorrosive property of mica/UV coated steel plates was tested by salt spray test (SST) and compared with sodium montmorillonite ($Na^+$-MMT)/UV coated steel plates.

An Experimental Study of Material Characteristics for GFRP Pipes (GFRP 관로의 재료 특성에 관한 실험적 연구)

  • Han, Taek-Hee;Kim, Sung-Nam;Kang, Young-Jong;Yoon, Ki-Yong
    • Journal of the Korean Society of Hazard Mitigation
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    • v.4 no.2 s.13
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    • pp.35-45
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    • 2004
  • Recently, the composite material becomes more popular and its usage is kept expanding from aerospace to civil structures such as bridge decks and irrigation and drainage pipes. The major cause for the popularity can be found in its high strength, light, and excellent anticorrosive properties. Nevertheless the methods to accurately predict and analyze its structural behavior are extremely limited. This has been the major reason circumventing more prevalent use of the composite materials in civil structures. This study is a pre-study to develop the analyzing models for accurate prediction of the composite material structures. Thus, various tests were performed for GFRP pipes to estimate material characteristics of GFRP in this study. And stress-strain relation of GFRP was suggested as a bilinear relation.

The Paint Prepared Using 2D Materials: An Evaluation of Heat Dissipation and Anticorrosive Performance

  • Bhang, Seok Jin;Kim, Hyunjoong;Shin, An Seob;Park, Jinhwan
    • Corrosion Science and Technology
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    • v.19 no.1
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    • pp.23-30
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    • 2020
  • Heat sinks are most widely used in thermal management systems; however, the heat dissipation efficiency is usually limited. Therefore, in order to increase heat dissipation efficiency of the heat sink, the heat-dissipating paint using 2D materials (hexagonal boron nitride (h-BN) and graphene) as thermally conductive additive was designed and evaluated in the present study. The heat dissipation performance of the paint was calculated from temperature difference between the paint-coated and -uncoated specimens mounted on the heat source. The highest heat dissipation performance was obtained when the ratio of h-BN to resin was 1/10 in the paint. In addition, further reduction in the temperature of the test specimen by 6.5 ℃ was achieved. The highest heat dissipation performance of the paint prepared using graphene was achieved at a 1/50 ratio of graphene to the resin, and a 6.5 ℃ reduction was attained. In addition, graphene exhibited enhanced corrosion resistance property of heat-dissipating paint by inhibiting the growth of the paint blisters.

Anticorrosive Coating Material with Dual Self-healing Capability for Steel Coating (이중 자기치유 메커니즘을 통한 강판의 내부식성 코팅)

  • Lee, Hyang Moo;Yun, Sumin;Kim, Jin Chul;Cho, Soo Hyoun;Cheong, In Woo
    • Journal of Adhesion and Interface
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    • v.22 no.2
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    • pp.47-56
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    • 2021
  • Steel plates coated by self-healable polymer still can be rusted since it takes time to be healed. In this study, dual self-healing coating material is developed using corrosion inhibitor (DTBEDA) which can form hindered urea (HUB) as reversible cross-linking bond at the same time. Developed dual self-healing polymer is coated on steel plate, and scratch healing property was investigated by surgical blades and nano/micro indentation tester. The anticorrosion effect of DTBEDA was investigated by electrochemical impedance spectroscopy (EIS).

Characteristics of LDPE resin film depending on RP contents (적인 함유량에 따른 LDPE 수지 film의 특성연구)

  • JO, Dong-Soo;Noh, Young-Tai;Park, Byung-Sun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.10
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    • pp.6655-6665
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    • 2015
  • Due to tightened environmental regulations on halogen type flame retardants, the portions of those based on phosphorous compounds that are non-halogen type is rising. When producing functional film, the physical and thermal properties become distinctly different depending on the amount of Red-phosphorus(RP) addition which causes flame resistance. The physical properties of resin fall in big scale when too much flame retardants are added, and it is hard to be applied to functional films such as shrink or anticorrosive film. The purpose of this research is to study the effects on mechanical, physical, and other properties of RP-LDPE films by changing the RP-MB contents. The LDPE film used for this study was produced through blow-type injection molding. The flame resistance was VTM-0, and the tear resistance showed inverse trends of MD and TD. Contraction percentage showed no relationship with the amount of RP content, but the anti-corrosive property showed 0.05 % better result than the national anti-corrosion shrink film reliability standard.

Recyclability Estimation of Fuel Tank Module in Vechicle (자동차 연료탱크 모듈의 재활용성 평가)

  • Lee, Chul-Min;Lee, Eun-Ok;Kim, Ha-Su;Lee, Jun-Su;Kang, Hee-Yong;Yang, Sung-Mo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.2
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    • pp.127-135
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    • 2006
  • We analyzed recyclability of the fuel tanks made from steel or aluminum alloy. For a comparison of the fuel tank recyclability, first we had analyzed the process of disassembly in a vehicle and evaluated its disassemblability. Then we evaluated the recyclability for reuse and withdrawal. The processes were more or less same owing to the similarity of fastening method of fuel tank and components. However, the fuel tank of the aluminum alloy was easier (about 5%) to disassembly than the fuel tank of steel. This could be attributed to the differences in weight of steel and aluminium. On light of the withdrawal and reuse, the fuel tank made up of steel needed to plate with zinc or lead due to its anti-corrosiveness. Hence, it required additional processes. In this paper, we were explaining the results of our on going research on the recyclability of fuel tanks made of steel and aluminum alloys. The differences that we found between the fuel tank made up of the aluminum alloy and steel were in their weight, recyclability, disassemblability, anticorrosive property, cost and productivity.