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이산화티탄이 코팅된 알루미나 볼에서 광촉매 반응에 의한 기상벤젠의 분해
이남희,정상철,선일식,조덕호,신승한,김선재,Lee Nam-Hee,Jung Sang-Chul,Sun Il-Sik,Cho Duk-Ho,Shin Seung-han,Kim Sun-Jae 한국재료학회 2004 한국재료학회지 Vol.14 No.6
Photo decomposition of gas phase benzene by $TiO_2$ thin films chemically deposited on alumina balls were investigated under UV irradiation. Photo decomposition rates were measured in real time during the reaction using a photo ionization detector, which ionizes C-H bonding of benzene molecules and then converts into volatile organic compounds (VOCs) concentrations. From the measuring results, the VOCs concentration increased instantly when IN irradiated because C-H bonds of benzene molecules strongly absorbed on the surface of $TiO_2$ films before the IN irradiation was destroyed by photo decomposition. After that, the VOCs concentration decreased with increasing surface area of $TiO_2$ and reaction time under the IN irradiation. At the optimal conditions for the photo decomposition of gas phase benzene, the reaction rate of the photo decomposition for high concentrations (over 60 ppm) was slow but that of relatively low concentration (under 60 ppm) was fast, due to limited surface area of $TiO_2$ thin films for the reaction. Thus, it is concluded that the photo decomposition rate was mainly affected by the surface area of $TiO_2$ or absorption reaction.
발전소용 이중보온용 강관의 홈부식(Grooving Corrosion)에 의한 파손 분석
함종오(Jong-Oh Ham),박기덕(Ki-Duck Park),박성진(Sung-Jin Park),선일식(Il-Sik Sun) 한국신뢰성학회 2015 신뢰성응용연구 Vol.15 No.3
Failure analysis of pre-insulated pipe (SPPS 380, 400A) transporting high temperature water (95~110℃) for a plant was carried out. The damaged area (Ф 5㎜) of pre-insulated pipe was found only on welds. The chemical composition of damaged pipe meets specification of carbon steel pipes for pressure service (KS D 3562). As results of microstructure analysis, crack propagated from outer to inside after pitting corrosion occurred on the outside surface. The non-metallic inclusion existed on the end of crack. And the non-metallic inclusion continuously and linearly formed along with the bond line of welds. Based on SEM-EDS analysis, the nonmetallic inclusions have higher Manganese (Mn) and Oxygen (O) content but sulfur (S) was not detected. As results of water quality analysis, hydrogen ion concentration and minerals like Fe, Mg, Si were in low level. But the content of dissolved oxygen (11.2 ppm) was slightly higher than that of standard. It seems that the cause of damaged pipe is grooving corrosion due to MnO inclusion formed on bond line and corrosion took place nearby welds.