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해수환경중 전착원리에 의해 형성시킨 환경친화적인 코팅막의 특성 분석
백상민(S-M Baek),이찬식(C-S Lee),김기준(K-J Kim),문경만(K-M Moon),이명훈(M-H Lee) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
??Cathodic protection is one of the successful ways to prevent corrosion of steel structures in marine environments. The unique feature of cathodic protection in seawater is the formation of calcareous deposits on cathodic metal surface. The formation principles of calcareous deposit seawater had been known for a long time. That is, cathodic reduction reactions associated with cathodic protection in seawater generate OH? at the metal surface in accordance with the formular ; 1/2 O₂+ H₂O + 2e? → 2OH? and 2H₂O + 2e? → H₂ + 2OH?. These reactions increase the pH at the metal / seawater interface. The high pH causes precipitation of Mg(OH)₂ and CaCO₃ in accordance with the formular ; Mg²? + 2(OH)? → Mg(OH)₂ and Ca²? + HCO?₃ + OH? → H₂O + CaCO₃. These are typically the main compounds in calcareous deposits. It obviously has several advantages compared to the conventional coatings, since the environment-friendly calcareous deposit coating is formed by the elements(Mg²?, Ca²?) naturally present in seawater. In this??study, environmental friendly calcareous deposit films were prepared on steel plates by electro plating technic in natural seawater. The influence of current density on composition ratio, structure and morphology of the coated films were investigated by scanning electron microscopy formation process of calcareous deposits films in natural seawater. And we confirmed the properties of all the films can be improved greatly by controlling the material structure and morphology with effective use of the electroplating method in natural seawater.
백상민(S.M.Baek),양정현(J.H.Yang),김기준(K.J.Kim),문경만(K.M.Moon),이명훈(M.H.Lee) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
Corrosion should be understood as on electro-chemical reaction between metal and its environment. To clarify the corrosion cause, it needs to perform variety of experiments considering material quality and its surrounding because complicated corrosion reaction occurs by each environmental conditions. To accomplish effective corrosion prevention system, perfect interpretation on the electro-chemical process of the material is necessarily required in advance. In this study, cause clarification of the corrosion that occurs in sprinkler pipes material during winter season was made by observing corrosion process and testing the materials in the various conditions.
백상민(S.M. Baek),배일용(I.Y. Bae),양정현(J.H. Yang),강준(J. K),이명훈(M.H. Lee) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
Mg thin films were prepared by PVD method on electroplated Zn steel substrate. And the influence of gas pressure on their morphology and d-value shift of the deposited films were investigated by scannig electron microscopy(SEM) and X -ray diffraction(XRD). In addition, the effect of corrosion resistance of these films as a function of morphology and d-value shift was evaluated by anodic polarization test. From the experiment results, it is investigated that the film of granular structure which deposited at high gas pressure condition had the best corrosion resistance.
백상민(S.M.Baek),양정현(J.H.Yang),김기준(K.J.Kim),문경만(K.M.Moon),이명훈(M.H.Lee) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
The ship performs heat exchange using seawater to keep main engine and auxiliary machinery at optimum temperature. In heat exchanger, refrigerant located outside of copper tube is cooled by seawater flowing through inside of copper tube. On the other hand, seawater erosion and corrosion may occasionally cause the corrosion of the copper tube in A/C(Air Conditioner) condenser. This corrosion of copper tube makes seawater and refrigerant mixed, seriously damaging A/C system. In this study. accordingly, the exactive mechanism of the corrosion on the condenser entailing serious problems occasionally is investigated through the electrochemical polarization experiments on the condenser's component materials. According to the experiments, the corrosive procedures on the copper tube was verified by the fact that passive film of the copper tube surface which is destroyed by the pressure of sucked seawater, is damaged by the corrosive ingredients in the seawater.