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동북 아시아 지역에서의 대기중 재료부식 시험에 관한 연구
김선태,임봉빈,邊野喜夫,前田泰昭 한국환경과학회 1998 한국환경과학회지 Vol.7 No.3
The structure such as building and cultural properties was composed of various materials like wood, metal and stone that have been utilized and exposed to air, wind and rain for a long time. However, because of their special characteristics as structure, collecting of samples that may involve their destruction cannot be permitted, ever for material analysis. Therefore, in order to study the influence of atmospheric pollution on structure, atmospheric corrosion tests were achieved by making use of materials(bronze, ancient copper, copper, steel and marble) in field exposure tests. Atmospheric exposure sites are selected from places which are characterized by urban, rural, industrial and marine environments in Northeast Asia. According to the results of atmospheric corrosion tests; The corrosion rates of industrial sites in china were more serious than other sampling sites. In the correlation of meteorological factors, wet hours was defined as integrated hours under that atmospheric temperature is above O℃ and relative humidity in above 80% that has a great influence on corrosion tests of materials in case of a short time. The relative humidity was above about 75% that resulted in great increase of corrosion rates. In the esimation of corrosion rates between materials, corrosion rates of steel was about thirty times and decuple larger than that of other materials excluding marble in unshelterd exposure and in sheltered exposure.
임봉빈,김선태,平井恭三,前田泰昭 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.3
The sonolytic decomposition of chlorofluorocarbon(CFC 113) and several alternative compounds, such as HCFC 225 ca, HCFC 225cb, and HFC 134a, in aqucous solutions was investigated. The CFC 113 with a high volatility and a low solubility in water was rapidly decomposed with increasing sonication time. The decomposition rates were influenced by the initial concentration of CFC 113, the reaction temperature, and the gas/liquid phase volume ratio but were independent of the pH of solution. The predominant pathway of the decomposition of CFC 113 by sonocation was not the oxidation by OH radicals but the pyrolysis with high temperature and pressure inside of the cavitation bubble. The pyrolysis in the cavitation bubble resulted in an almost complete mineralization of CFC 113 with the high efficient formation of inorganic products(Cl^(-), F^(-), CO, CO₂). The addition of zine powder on the decomposition of CFC 113 by sonication caused an acceleration of the decomposition. Also, HCFCs and HFC 134a were found to be readily decomposed by the pyrolysis induced from the sonication.