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  • Page : 152 - 156 DOWNLOAD
  • 액체급냉법에 의해 제조한 비정질 Co-Nb-B 합금의 전기화학적 부식 특성
  • This study was undertaken to examine the electrochemical corrosion properties of an Co80Nb10B10 and Co82Nb8B10 amorphous alloys prepared by melt-spinning method under various conditions. The potentiodynamic polarization responses at various levels of pH (pH 2, pH 7, pH 12) showed that the corrosion current rate of Co80Nb10B10 alloy is lower than that of Co82Nb8B10 alloy in all levels of pH, implying the general corrosion resistance of the alloy with higher Nb content is better than that with higher Co content. The pitting potential of Co80Nb10B10 alloy was also better than that of Co82Nb8B10, evidenced by the higher pitting potential. Nb is thought to be effective in increasing the protectiveness of the passive film and hence to improve the corrosion resistance of Co-Nb-B alloys.
  • KEYWORDs : amorphous alloys, Co-Nb-B alloys, potentiodynamic polarization, uniform corrosion, pitting
  • AUTHORs : 김은선·김현구·장희진†
  • Page : 145 - 151 DOWNLOAD
  • 핵연료 피복관 부식생성물 부착에 관한 Ni/Fe 이온 농도비의 영향
  • The objectives of this study are to investigate the effect of the concentration ratios of Ni and Fe ions on crud deposition onto the fuel cladding surface in the simulated primary environments of a pressurized water reactor. Crud deposition tests were conducted in the Ni and Fe concentration ratios of 20:20 ppm, 39:1 ppm and 1:39 ppm at 325℃ for 14 days. In the case of the same Ni and Fe ion ratio (20:20), nickel
    ferrite with a polyhedral shape was formed. Nickel oxide deposits with a needle shape were formed in the condition of high Ni to Fe ion ratio (39:1), While polyhedral iron oxide and needle-like nickel oxide formed in the condition of low Ni to Fe ion ratio (1:39). The amount of deposits increased, when Fe oxides were formed. This indicates that Fe rich oxides stimulated Ni oxide deposition.
  • KEYWORDs : axial offset anomaly, ni and fe ion concentration, crud deposition, primary water chemistry
  • AUTHORs : 백승헌·김우철·심희상·임경수·허도행†
  • Page : 139 - 144 DOWNLOAD
  • 도장이 필요없는 내후성강 박스거더 상부 플랜지외부면 방식제 주입을 통한 방식공법 연구
  • In corrosion-sensitive area of exsisting unpainted weathering steel bridge with closed box girder structure. there are some serious local corrosion problems because of rain water or dew water which can not be solved by conventional maintenance method. These problems must be technically controled because of the
    influence on the safety of bridge. This study is the first stage of developing the economic corrosion control manual for these local corrosion problems. Through the injecting experiment of tar sealant into the crevice of mock-up equipment, it was proofed that the corrosive sealant can be useful to corrosion control at crevice
    of corrosion sensitive area.
  • KEYWORDs : weathering steel, splice connection part, corrosion, corrosion sensitive area, multi-function sealant
  • AUTHORs : 송 창 영
  • Page : 130 - 138 DOWNLOAD
  • 고체입자 충돌침식으로 인한 배관 재질의 손상에 관한 연구
  • Wall thinning can be classified into three types: flow-accelerated corrosion, cavitation erosion and solid particle erosion. This article presents a study of solid particle erosion, which frequently causes damages to power plants’ pipe system. Unlike previous studies, this study uses a mechanism to make solid particles
    in a fluid flow collide with pipe materials in underwater condition. Experiment is conducted in three cases of velocity according to solid-water ratio using the three types of the materials of A106B, SS400, and A6061. The experiments were performed for 30 days, and the surface morphology and hardness of the materials were examined for every 7 days. Based on the velocity change of the solid particles in a fluid flow, the surface changes, the change in the amount of erosion, the erosion rate and the variation in the hardness of carbon steel and aluminum family pipe materials can all be determined. In addition, factorbased erosion rates are verified and a wall-thinning relation function is suggested for the pipe materials.
  • KEYWORDs : solid particle erosion, loss of pipe material, wall thinning, solid-water ratio, particle content, erosion rate, least squared method
  • AUTHORs : 김경훈·최덕현·김형준
  • Page : 125 - 129 DOWNLOAD
  • Investigation of shinning Spot Defect on Hot-Dip Galvanized Steel Sheets
  • Shinning spot defects on galvanized steel sheets were studied by optical microscope, scanning electron microscope(SEM), Energy Dispersive Spectrometer (EDS) and Laser-Induced Breakdown Spectroscopy Original Position Statistic Distribution Analysis (LIBSOPA) in this study. The research shows that the coating thickness of shinning spot defects which caused by the substrate defect is much lower than normal area, and when skin passed, the shinning spot defect area can not touch with skin pass roll which result in the surface of shinning spot is flat while normal area is rough. The different coating morphologies have different effects
    on the reflection of light, which cause the shinning spot defects more brighter than normal area.
  • KEYWORDs : shinning spot defect, coating morphologies, coating thickness, substrate defect.
  • AUTHORs : LIU Yonggang and CUI Lei