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코발트 회전전극을 이용한 부식 반응 기구 및 산소의 영향에 관한 고찰
朱宰伯 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-
Electrochemical dissolution behavior of cobalt in sulfate solutions was investigated. Tafel kinetic behavior of cobalt dissolution and hydrogen reduction were measured in acid and alkaline solutions containing sulfate ions at several pH values. Rotating disc electrode was used in order to eliminate the mass transport limitations at the electrode surface. The increase of pH resulted the shift of corrosion potential and the decrease of corrosion current. Also the kinetic mechanism of cobalt dissolution in acid solution was examined. The effect of dissolved oxygen in acidic solution on the corrosion and electrodissolution of cobalt and the oxygen reduction on cobalt were studied with rotating disc electrode. The increase of dissolved oxygen concentration enhanced the corrosion current. The number of electrons consumed in the oxygen reduction process was determined as about 2 in hydrochloric acid and about 4 in sulfuric acid. This indicates that the primary product is hydrogen peroxide in chloride solution and water in sulfate solution in the process of oxygen reduction.
朱宰伯,李政峻 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
Electrochmical dissolution behavior of cobalt in chloride solution was investigated. Kinetic data of cobalt dissolution and hydrogen reduction were measured in acid and alkaline solutions containing chloride ions at several pH values. Rotating disc electrode was used in order to eliminate the mass transport limitations at the electrode surface. The effect of pH on the corrosion potential and corrosion current were observed. Also the kinetic mechanism of cobalt dissolution in acid solution was examined. It was found that the dissolution behavior in chloride solution is quite different from that in sulfate solution.
구리 미소 전극의 전기화학적 용해에 대한 과도기적 특성 변화의 이론적 해석
朱宰伯,鄭容錫 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2
A transient behavior of a copper micro-band electrode dissolved electrochemically in hydrochloric acid has been solved by BIEM. The indirect method involving the Laplace transformation was used to analyze the system. The local current distribution becomes nonuniform when the dissolution time is proceeded. Especially the current density was increased sharply at the edge of electrode. It was found that the Tafel slope increased as the dissolution time was proceeded. Theoretical results shows that Tafel slope becomes constant value at steady state and the electrochemical dissolution behavior of copper in hydrochloric acid was mass transfer controlled.
朱宰佰 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
A theoretical model was developed for the calculation of current distribution problems. The problem in this study is the electroplating through a hole in circuit board. We assumed that the flow pattern was tubular laminar flow through a hole. With use of commercial partial differential equation solver, The model equations was solved successfully. The results of secondary and tertiary current distribution problems showed that the value of applied potential or current was important to determine the uniformity of current distribution rather than the direction of fluid flow.
정방 Cavity형 전극내 물질전달 분포의 이론적 예측
朱宰伯,李鎭宇 弘益大學校 科學基術硏究所 1999 科學技術硏究論文集 Vol.10 No.2
Prediction of mass transfer rates between the interior surface of small rectangular cavities and the solution glowing past the cavity opening, was investigated by theoretical method. The boundary integral method was used to calculate the viscous shear stress along the cavity surface under the assumption of Stokes flow for aspect ratios(width:depth) between 0.5:1 and 5:1. Based on the distribution of shear stress, the local mass transfer rate was calculated using the Lighthill integral method. The distribution of shear stress was symmetric because of its Stokes flow regime. However the distribution of local mass transfer rate was not symmetric and the largest mass transfer rate was occurred at the right corner of cavity. The mass transfer rate was proportional to the Re⅓ and this is in good agreement with experimental results previously known. The mass transfer rate increased with the increase of aspect ratio, but the method used in this study showed some errors when the aspect ratio exceeded the value of 3.
유체가 흐르는 원통형 관내의 최적 전기도금을 위한 전류분포의 예측
朱宰伯,鄭在益 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1
The methmatical model of the tertiary current distribution for the optimum conditions of electroplating inside a cylindrical tube with fluid flows, was stuied. With the assumption of fully developed flow, in the diffusion layer region the steady state equation of laminar convective diffusion was used, in the bulk region the Laplace's equation in cylindrical coordinates was used. The optimum condition of electroplating considered parameters that decide current distribution, was predicted.