HOME >  >

메뉴

  • 학회지
  • 학회보
    • 개요
    • 투고게시판
  • 공동발간지
  • 논문 검색
  • 도서/자료 신청
    • 도서신청
    • Proceeding 신청
    • 회지/회보 신청
    • 자료복사 신청
  • 광고안내/신청
    • 광고안내
    • 광고 신청

  • Page : 224 - 232 DOWNLOAD
  • 전처리가 그래핀을 코팅한 고체고분자 연료전지 분리판의 전기화학적 특성에 미치는 영향
  • Effect of pretreatments on the graphene coated bipolar plate of proton exchange membrane fuel cell(PEMFC) was investigated in simulated environments for PEMFC by using electrochemical measurement techniques. Interfacial contact resistance(ICR) between the graphene coated bipolar plate and the gas diffusion layer(GDL)
    was measured. The value of ICR decreased with an increase in compaction stress(20N/cm2~220N/cm2). ICR of graphene coated bipolar plate was higher than that of bare 316L stainless steel. However, Potentiodynamic measurement results showed that the corrosion resistance of graphene coated bipolar plate was higher than that of bare 316L stainless steel. H2SO4 acid pretreatment was the most effective among various pretreatments. The lowest ICR and the corrosion current density were obtained when using H2SO4 solution pretreatment.
  • KEYWORDs : PEMFC, bipolar plate, graphene, stainless steel, interfacial contact resistance, corrosion resistance
  • AUTHORs : 차성윤·이재봉†
  • Page : 214 - 223 DOWNLOAD
  • 염해 및 복합열화에 의한 부식촉진시험과 장기폭로 시험의 상관성에 관한 연구
  • Interest in the durability assessment and structural performance has increased according to an increase of concrete structures in salt damage environment recent years. Reliable way ensuring the most accelerated corrosion test is a method of performing the rebar corrosion monitoring as exposed directly to the marine test site exposure. However, long-term exposure test has a disadvantage because of a long period of time. Therefore, many studies on reinforced concrete in salt damage environments have been developed as alternatives to replace this. However,
    accelerated corrosion test is appropriate to evaluate the critical chlorine concentration in the short term, but only accelerated test method, is not easy to get correct answer. Accuracy of correlation acceleration test depends on the period of the degree of exposure environments. Therefore, in this study, depending on the concrete mix material, by the test was performed on the basis of the composite degradation of the salt damage, and investigate the difference of corrosion initiation time of the rebar, and indoor corrosion time of the structure, of the marine
    environment of the actual environments were inuestigated. The correlation coefficient was derived in the experiment. Long-term exposure test was actually conducted in consideration of the exposure conditions submerged zone, splash zone and tidal zone. The accelerated corrosion tests were carried out by immersion conditions, and by the combined deterioration due to the carbonation and accelerated corrosion due to wet and dry condition.
  • KEYWORDs : durability, accelerated corrosion test, salt damage, neutralization test, tidal zone
  • AUTHORs : 박상순†·이민우
  • Page : 209 - 213 DOWNLOAD
  • Resistance to Corrosion of Reinforcement of High Volume Fly Ash Concrete
  • Due to the increasing of interest about the eco-friendly concrete, it is increased to use concretes containing by-products of industry such as fly ash(FA), ground granulated blast furnace slag(GGBFS), silica fume(SF), and etc. Especially, these are well known for improving the resistances to reinforcement corrosion in concrete
    and decreasing chloride ion penetration. The purpose of this experimental research is to evaluate the resistance against corrosion of reinforcement of high volume fly ash(HVFA) concrete which is replaced with high volume fly ash for cement volume. For this purpose, the concrete test specimens were made for various strength level and replacement ratio of FA, and then the compressive strength and diffusion coefficient
    for chloride ion of them were measured for 28, 91, and 182 days, respectively. Also, corrosion monitoring by half cell potential method was carried out for the made lollypop concrete test specimens to detect the time of corrosion initiation for reinforcement in concrete. As a result, it was observed from the test results
    that the compressive strength of HVFA concrete was decreased with increasing replacement ratio of FA but long-term resistances against reinforcement corrosion and chloride ion penetration of that were increased.
  • KEYWORDs : high volume fly ash concrete, corrosion of reinforcement, monitoring, resistance to chloride ion penetration
  • AUTHORs : S. O. Kwon, S. H. Bae†, H. J. Lee, K. M. Lee, and S. H. Jung