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초고강도 자동차용 강의 환원정전류인가에 따른 산화 거동 변화 연구
하헌영 ( Heon-young Ha ),김혜진 ( Hye-jin Kim ),문준오 ( Joonoh Moon ),이태호 ( Tae-ho Lee ),조효행 ( Hyo-haeng Jo ),이창근 ( Chang-geun Lee ),유병길 ( Byung-kil Yoo ),양원석 ( Won-seog Yang ) 한국부식방식학회(구 한국부식학회) 2017 Corrosion Science and Technology Vol.16 No.6
The change in the oxidation behavior of three types of B-added ultrahigh strength martensitic steels containing Ti and Nb induced by applying constant cathodic current was investigated. In a 3% NaCl+0.3% NH<sub>4</sub>SCN solution, the overall polarization behavior of the three alloys was similar, and degradation of the oxide film was observed in the three alloys after applying constant cathodic current. A significant increase in the anodic current density was observed in the Nb-added alloy, while it was diminished in the Ti-added alloy. Both Ti and Nb alloying decreased the hydrogen overpotential by forming NbC and TiC particles. In addition, the thickest oxide film was formed on the Ti-added alloy, but the addition of Nb decreased the film thickness. Therefore, it was concluded that the remarkable increase in the anodic current density of Nb-added alloy induced by applying constant cathodic current density was attributed to the formation of the thinnest oxide film less protective to hydrogen absorption, and the addition of Ti effectively blocked the hydrogen absorption by forming TiC particles and a relatively thick oxide film.
전반사 경계 무늬에 의한 고체와 액체 굴절률의 동시 측정 : 이론적 고찰
윤병종,유병길 부산교육대학교 과학교육연구소 1999 科學敎育硏究 Vol.24 No.-
The bright and dark ring patterns by total reflection is observed when the concentrated light in impinged perpendicularly on the transparent plate attached with white watery paper. In this case, we showed that the refractive indexes of the transparent plate and the attached liquid can be calculated simultaneously.