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정유엽,이성룡,황용길 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
This study has been carried out to investigate the effect of low current in electroless Ni-P plating. The results obtained from the experiment are summarized as follows ; 1) The plating rate in the composite plating of electrolysis and electroless is more double than in electroless plating. And optimum temperature of electroless plating is 85-95℃ but composite plating has been gained a excellent quality of plating at 40℃ 2) The higher temperature, higher PH, and lower current density, the better a leveling of plating surface is. And the composite plating under 0.5A/d㎡ current density is better than the electroless plating in the leveling of plating surface. 3) With passing the time, the composite plating is less than that of the electroless in the reduction of plating rate. 4) Composite plating is higher than electroless plating in hardness when they have been plated and heat-treated at 350℃
Formation of Iron Oxides in a Waste Pickling Liquor
이성룡,정유엽,안영민,윤정,황용길,Lee, S. R.,Jeong, Y. Y.,Ahn, Y. M.,Yoon, J.,Hwang, Y. G. The Korean Institute of Resources Recycling 1992 資源 리싸이클링 Vol.1 No.1
The $\alpha$-FeOOH powders were prepared by allkaline and acidic method on the small scale plant from the waste pickling liquor of iron. $\alpha$-FeOOH, $\alpha-Fe_2O_3$, $Fe_3O_4$ and ${\gamma}-Fe_2O_3$ powders were examined by TEM, SEM, TG-DTA, X-ray diffraction, VSM and chemical analysis. The results obtained from the experiment could be summerized as follows : the reaction time for the preparation of $\alpha$-FeOOH was observed to be smaller in the case of alkaline method and the products was acicular with the size of about $0.5\mu\textrm{m}$. The color of $\alpha-FeOOH and $\alpha-Fe_2O_3$was lovely yellow and red, respectively. The magnetic properties of $Fe_3O_4$ obtained by the reduction of $\alpha-Fe_2O_3$in the $H_2$ atomosphere at $370^{\circ}C$ for 1 hour showed 367(Oe) and 82.7(emu/g).