http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
무시안 알칼리 아연 도금을 위한 Hull cell Test
孫太源 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.-
Noncyanide alkaline plating process on zinc was studied by analysing the process technology through efficiency test, analysis of fluid composition, and physical property research on existing oversea manufactures. Also it was compared suggested solution's standard composition with manufactures' one under plating conditions and changes of solution composition, consumption, impurity effect. It was examined electrochemical characteristics of agents such as complexing agent, conductivity reinforcing agent and stability. Zinc plating characters such as uniformity, brightness using Hull cell test. Electrochemical quality of zinc plating solution was studied by searching current density, current efficiency and cyclic voltammeter. Suggested product's plating characteristics such as agent's quantity, current density and relation with plating temperature are composed with existing cyanide plating process and oversea products through Hull cell test. Suggested product showed superior qualities in most of aspects such as uniformity, brightness, and leveling. Even comparing to cyanide alkaline plating, sample showed superiority in every aspect except plating rate. However, at high current region, brightness bounds became narrowed compare to oversea product.
돌출부를 지닌 전극의 전기도금시스템에 대한 이론적 이차 전류분포 해석
손태원,주재백,Sohn, Tai-Won,Ju, Jeh-Beck 한국전기화학회 2009 한국전기화학회지 Vol.12 No.4
돌출부를 지니고 있는 전극의 전기도금 공정에 대한 이론적 이차 전류분포에 대하여 고찰하였다. 전극이 모두 전도체인 경우(Case 1)와 돌출부위만 전도체인 경우(Case 2) 두 가지 경우에 대하여 인가전위, 이온교환 전류밀도와 용액의 비전도도의 비인 $\xi$값, aspect ratio의 영향 등에 대하여 살펴보았다. 그 결과 인가 전위와 $\xi$값이 증가할수록 전류분포는 불균등화가 심화됨을 알 수 있었다. Aspect ratio가 작아질수록 전류분포가 보다 균등화되며 Case 2의 경우가 Case 1의 경우 보다 균등도가 좋아짐을 알 수 있었다. 돌출부위가 다양한 모양으로 이루진 전극에 대해서도 이 모델을 적용한 결과 전극 표면에 따른 국부 전류분포를 동시에 계산할 수 있음을 알 수 있었고 이 경우에도 이전과 마찬가지로 $\xi$값이 감소할수록 전류분포의 균등도가 좋아짐을 알 수 있었다. Theoretical calculations for the secondary current distributions for the electrode with a projection part in electroplating were performed. Two kinds of electrodes were considered. One is a electrode with the overall conducting surfaces(Case 1) and the other is an electrode in which only a projection part has a conducting surface(Case 2). The effects of applied potential, the ratio of ion exchange current to conductivity, $\xi$ and the aspect ratio on the current distribution were examined. The increase of applied current or the value of $\xi$ decreased the uniformity of current distribution. The small value of aspect ratio resulted the more uniform current distribution and Case 2 showed the better uniformity than Case 2. When this model was applied into an electrode with various projection parts, the local current distribution along the electrode surface were obtained successfully. In this case, the decrease of $\xi$ also increase the uniformity of current distribution as seen previously.
전기도금에 의한 알루미늄의 박막 제조 및 그 특성에 관한 연구
孫太源,趙漢相 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.-
용융탄산염 연료전지(Molten Carbonate Fuel Cell ; MCFC)는 최근 10년간 제 3세대 연료전지로써 활발한 개발 중에 있다. MCFC는 고온에서 작동하므로 반응속도가 빨라 고가의 촉매가 필요 없으며 다량의 폐열회수가 가능하지만, 고온에서 작동되므로 전극재료의 부식문제나 기계적 안정성, 전해질의 관리문제 등의 문제점등이 대두되고 있다. MCFC의 스테인레스강으로 된 분리판의 부식문제 해결은 현재도 많은 관심사가 되고 있다. 특히 wet seal부위에 대한 부식을 방지하기 위하여 주로 스테인레스강에 알루미늄 박막을 코팅하는 기술이 요구되고 있으며, 그 방법으로는 용융도금, Plasma spray, PVD, DVD, 전기도금 등이 있다. 이 방법들 중 용융염 전기도금의 경우, 적절한 알루미늄의 전기도금을 위해 알맞은 전해질을 선택하는 것이 중요하다. 본 연구에서는 aluminum-chloride-alkali melt 전해질과 유기용매를 제조하여 각 전해질의 전기화학적 특성에 대해 실험을 하였다. 선형전류전압법을 사용하여 알루미늄 환원 기작을 연구하였고 용융염 전해질에서 stainless steel으로 알루미늄의 확산계수가 D_(0)=2.98×10^(-10) ㎠/sec, 유기용매 전해질에서 D_(0)=6.41×10^(-9) ㎠/sec 임을 알수 있었다. 또한 10mA/㎠의 전류 밀도로 전기도금을 시행한 결과 알루미늄 도금층을 확인할 수 있었다. The molten carbonate fuel cell(MCFC) has been under intensive development during the last decade as second generation fuel cell. It has high reaction rate, need not expensive catalyst and, can recover heat of large quantity. But high operating temperature results in many troubles such as corrosion of electrode material, maintenance of electrolytes, etc. Corrosion of wet seal area that made of stainless steel is very important. For the corrosion protection of wet seal area, techniques that coating stainless steel with aluminum film are required. These coating techniques are molten plating, plasma spray, physical vapor deposition, chemical vapor deposition and electrodeposition(electroplating), etc. In case of molten salt electroplating among these techniques, suitable electrolyte is selected for pertinent electroplating of aluminum. In this study, we prepared aluminum chloride-alkali chloride melt electrolyte and organic electrolyte. We proceeded to experiment using them for electrochemical characterist of each electrolyte. A detail study of the aluminum reduction mechanism was carried out using the electrochemical methods of linear sweep voltammetry. The solid state diffusion coefficient of aluminum into the stainless steel was evaluated and found to be D_(0)=2.98 x 10^(-10) ㎠/sec in molten salt electrolyte and D_(0)=6.41 x 10^(-9) ㎠/sec in organic electrolyte. In addition, electroplating reaction using galvanostatic method progressed toward cathodic direction(10 mA/㎠) and aluminum plating layer was observed.
손태원,정한규 한국시스템다이내믹스학회 2000 한국시스템다이내믹스 연구 Vol.1 No.1
Most model constructs in organization studies are descriptive in nature, and the conclusions relating to the model behavior over times are speculative. The usefulness of System Dynamics as a methodology for modeling and testing dynamic behavioral hypotheses on organizational behavioral studies is presented, and how to construct a System Dynamics model using simulation software(VENSIM) is shown. The well-known March and Simon motivation model is used to demonstrate the step by step application of System Dynamics to models of this type. The dynamic behavior of the model, both transient and steady state, is obtained. Even though the paper has focused on one model in the area of individual behavior, the approach is general and can be applied to other of organizational behavior as well. The usefulness of System Dynamics as a methodology for theory building is identified as well.