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유/무기 하이브리드 코팅액에 의한 냉간압연강판의 내식특성
김정량(Jung Ryang Kim),최창민(Chang Min Choi),남기우(Ki Woo Nam) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.4
종래 아연의 부식 속도를 줄이는 가장 일반적인 방법은 Cr??를 도포하여 화학적으로 개조하는 것이었다. 그러나 Cr??는 현재 환경 보호법 때문에 사용이 제한되어 있다. 따라서 자자들은Si를 가지는 유/무기 용액에 대한 아연도금강판의 최적 조건을 연구하였다. 최적 내식성은 190 ℃에서 5분간 열처리한 조건으로 나타났다. 본 연구에서는 내식성 평가를 위하여 우레탄 용액(Urethane 20 wt.% ; S-700), Si를 가지는 유 무기 용액(Si polysilicate 10 wt.% + Urethane 10 wt.% LR-0317) 및 Si와 Ti를 가지는 2종류의 유/무기 용액(Si polysilicate 7 wt.% + Urethane 13 wt.% + Ti amorphous 0.5 wt.% ; LR-0727(1), Si polysilicate 7 wt.% + Urethane 7 wt.% + Ti amorphous 0.5 wt.% + epoxy 6 wt.% ; LR-0727(2))을 사용하였다. 내식성 평가는 냉간압연 강판을 사용하여 염수분무 시험으로 실시하였다. 7시간의 염수 분무 시험에서 LR-0727(1)과 LR-0727(2) 용액이 냉간 압연 강판에 대하여 우수한 내식성을 나타내었다. In the past, a very popular way to reduce the corrosion rate of zinc was the use of chemical conversion layers based on Cr??. However, the use of chromium salts is now restricted because of environmental protection legislation. Previous research investigated the optimum corrosion resistance of galvanized steel treated with an organic/inorganic solution containing Si. The result showed that the optimum corrosion resistance occurred by heat treatment of 190℃ in 5 min. In this study, one organic and three hybrid organic/inorganic coating solutions were applied to cold-rolled (CR) carbon steel. The coatings were then evaluated for corrosion resistance under a salt spray test. The coating solutions examined in this study consisted of urethane-only, urethane-Si, urethane-Si-Ti, and urethane-Si-Ti-epoxy. The results of the 7 h salt spray test showed that the urethane-Si-Ti and urethane-Si-Ti-epoxy coating solutions had superior corrosion resistance on CR steel.
유/무기 하이브리드 코팅액에 의한 냉간압연강판의 내식특성
남기우(Ki Woo Nam),김정량(Jung Ryang Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
In the past a very popular way to reduce the corrosion rate of zinc was the use of chemical conversion layers based on Cr??. However, there is the important problem that the use of chromium salts is now restricted because of environmental protection legislation. Earlier researcher investigated that the optimum of organic/inorganic solution with Si. In this study, Urethane solution (only Urethane 20 wt. % ; S-700), organic/inorganic solution with Si (Si polysilicate 10 wt. % + Urethane 10 wt.% LR-0317) and organic/inorganic solution with Si and Ti(Si polysilicate 7 wt.% + Urethane 13 wt.% + Ti amorphous 0.5 wt.% ; LR-0727(1), Si polysilicate 7 wt.% + Urethane 7 wt.% + Ti amorphous 0.5 wt. % + epoxy 6 wt. % ; LR-0727(2)) are used. Based on the salt spray test of 7 h, LR-0727(1) and LR-0727(2) had a superior effect for the corrosion resistance on CR steel, respectively.
크롬 프리 친환경 유/무기 하이브리드 코팅액에 의한 냉연강판의 내식특성
남기우(Ki Woo Nam),김정량(Jung Ryang Kim),최창민(Chang Min Choi) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.2
In the past, a very popular method for reducing the corrosion on zinc involved the use of chemical conversion layer coatings based on Cr<SUP>+6</SUP>. However, there is an important problem with using chromium salts as a result of restrictive environmental protection legislation. This study investigated the optimum condition for galvanized steel using an organic/inorganic solution with a Ti composition. In the case of a fixed heat treatment time, the corrosion resistance values of LR-0727(1) and LR-0727(2) were improved as the heat treatment temperature increased, and the optimum minimum temperature decreased with the heat treatment time. At the optimum heat treatment condition of two coating solutions, the heat treatment time of the LR-0727(1) solution was shorter than LR-0727(2) for the same heat treatment temperature. LR-0727(1) coated specimens did not show desquamation, and all of the specimens showed a good adhesive property. In contrast, in the case of the LR-0727(2) coated specimens, desquamation arose. Therefore, the adhesive property of LR-0727(1) was superior to that of LR-0727(2). The pencil hardness had a 3H average for all of the coating solutions and heat treatment conditions. In the case of a corrosion resistance test with boiling water, the coated specimens of LR-0727(1) were discolored, but LR-0727(2) was not. Finally, LR-0727(1) was more moisture proof than LR-0727(2).
유/무기 하이브라드 코팅액에 의한 냉간압연강판의 열처리 온도에 따른 내식특성
남기우(Ki Woo Nam),김정량(Jung Ryang Kim),최창민(Chang Min Choi) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.6
The demand for cold rolled steel (CR) for structural members is gradually increasing. If no surface treatment (coating for corrosion resistance) for CR is conducted, its use is very limited because CR is vulnerable to corrosion. Therifore, we need to develop a coating solution to provide high corrosion resistance for CR. In this study, an organic/inorganic coating solution with Si and Ti (Si polysilicate 7 wt. % + Urethane 13 wt. % + Ti amorphous 0.5 wt. %; LR-0727(1)) was used to evaluate the corrosian resistance of CR under a salt spray test. The specimens with the LR-0727(1) coating were heat treated in a drying oven at 120-210 ℃ for 5 min. The corrosion resistance was investigated using a salt spray test of 7 h. In addition, an adhesive test was conducted. Rust showed under a heat treatment of 150 ℃, but no vestiges were found over 160 ℃. The specimens with heat treatment at 160 ℃ or nwre did not experience delamination. From these results, it is considEred that the temperature limit for optimum heat treatment is 160 ℃ considering energy efficiency.
유/무기 하이브리드 코팅액에 의한 냉간압연강판의 열처리 온도에 따른 내식특성
남기우(Ki-Woo Nam),김정량(Jung-Ryang Kim) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
The demand of Cold Rolled Steel(CR) for automobile is gradually increasing. If surface treatment(coating for corrosion resistance) of CR is not conducted, the use is very limited. Because CR is vulnerable to corrosion. Therefore we need development of coating solution of high corrosion resistance about CR. In this study, the solutions of organic/inorganic solution with Si and Ti(Si polysilicate 7 wt.% + Urethane 13 wt.% + Ti amorphous 0.5 wt.% ; LR-0727(1)) are used for evaluation of corrosion resistance of CR under salt spray test. Test specimens with LR-0727(1) coating had heat treatment in the drying oven at 120 ~ 210℃ for 5 minute. Corrosion resistance was investigated with salt spray test of 7 hours. And adhesive test was conducted, too.
Si 변성 유/무기 하이브리드 코팅액에 의한 아연도금강판의 내식특성
서현수(Hyun-Soo Seo),문희준(Hee-Joon Moon),김정량(Jung-Ryang Kim),김종순(Jong-Soon Kim),안석환(Seok-Hwan Ahn),문창권(Chang-Kwon Moon),남기우(Ki-Woo Nam) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.1
Galvanized steel has gone through a chemical process to keep it from corroding. The steel gets coated in layers of zinc because rust will not attack this protective metal. For countless outdoor, marine, or industrial applications, galvanized steel is an essential fabrication component. The reduction of the corrosion rate of zinc is an important topic. In the past, a very popular way to reduce the corrosion rate of zinc was to use chemical conversion layers based on Cr??. However, a significant problem that has arisen is that the use of chromium salts is now restricted because of environmental protection legislation. Therefore, it is very important to develop new zinc surface treatments that are environmentally friendly to improve the corrosion resistance of zinc and adhesion with a final organic protective layer. In this study, a Urethane solution (only Urethane 20 wt.%; S-700) and an organic/inorganic solution with Si (Si polysilicate 10 wt.% + Urethane 10 wt.%; LRO-317) are used. Based on the salt spray test of 72 h, S-700 and LRO-317 had a superior effect for the corrosion resistance on EGI and HDGI, respectively.
이치호,김정량,김기헌,최우식 한국약제학회 1991 Journal of Pharmaceutical Investigation Vol.21 No.1
Dissolution profiles of ketoconazole in solid dispersion system (SDS) were investigated in the second fluid (pH 6.8) for the dissolution test (KPV). PVP K-30 and methyl cellulose were used as carriers in SDS, and chloroform as a solvent. Computer optimization technique was applied to obtain an optimum formula of SDS, and the following results were obtained; 1) Dissolution rate of ketoconazole in SDS was larger than that of pure ketoconazole in the second fluid of pH 6.8. 2) PVP K-30 and methyl cellulose were good carriers for SDS of ketoconazole. Moerover, PVP K-30 was better than methyl cellulose. 3) The optimum formula of ketoconazole SDS obtained from computer optimization technique was chloroform 175 ㎖, PVP K-30 5g and methyl cellulose 0.2g per 1g of ketoconazole. 4) The experimental value of A_(60) (Amount released from ketoconazole tablet during 60 minutes) obtained from SDS by optimum formula agreed well with the value calculated by polynomial regression equation.