http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
강판의 내식성 향상을 위한 환경 친화형 표면처리 : 다중코팅에 의한 시너지 효과 Synergy Effect by Multicoating
전상익,박찬영,류진호,이원기 한국환경과학회 2005 한국환경과학회지 Vol.14 No.1
Because of the toxicity of hexavelant chromium ion, treatments of metallic surface with chromate compounds to retard corrosion are undesirable for safety control in industrial uses and protection of environment. In this study, we investigated several compounds such as inorganic. organic. and polymer materials in order to substitute the chromate conversion treatment on steel sheet. The corrosion property was investigated in a salt spray tester with 3.5 wt.% NaCl at 35℃. The results showed that the zirconium/silane/polymer triple coatings on the galvanized steel exhibited a significant retardation of corrosion. Although the multicoating system needs a cornplexed processing. we can confirm a possibility of development of a chromate-free chemical conversion treatment for galvanized steel sheet.
Stereocomplex형성에 의한 Enantiomeric Polylactides의 가수분해거동
전상익,이원기 한국공업화학회 2004 응용화학 Vol.8 No.1
In this study, we have investigated in vitro the alkaline and enzymatic hydrolysis of enantiomeric mixtures from l-PLA and d-PLA at the air/water interface. It was founded that the hydrolysis rate of stereocomplexed-mixture conolayers from l-PLA and d-PLA was much lower than those of their homopolymers, regardless of degradation mediums. The retardation of hydrolysis is mainly due to strong interaction between d- and l-lactide unit sequences, which prevents the penetration of degradation mediums into the bulk. To conform this behavior of stereocomplexes, hydrolytic behaviors of solution-cast thin films were also investigated. The result was well consistent with monolayer's behavior.
이원기,전상익 한국공업화학회 2003 응용화학 Vol.7 No.2
This work aims the search of environmentally friendly pre-treatment technologies to develop chromate replacements for metal finishing industries due to its toxicological properties. Since the corrosion resistance of steel was strongly related to water permeation, galvanized steel sheets were treated with various hydrophobic silane compounds and water-suspended polymer solution. The corrosion property after was investigated in a slat spray tester with 3.5 wt.% NaCl at 35 ℃. The results showed that both Zirconium/silane double coatings on the galvanized steel exhibited significant retardation of corrosion.