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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.
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.