http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김기준(Ki-Joon Kim),배일용(Il-Yong Bae),이명훈(Myung-Hoon Lee) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
Stainless steel is frequently used as a shaft material of small-size FRP ships. The kinds of stainless steel for this purpose are mainly STS 304(18Cr-8Ni), STS 3l6(18Cr-12Ni-2.5Mo) and STS 630(l7Cr-4Ni-Nb). Among them STS 304 is the most common and widely used as a 2<SUP>nd</SUP> class shaft material because of cheap price and reasonable corrosion resistance in marine environment. Recently some severe localized corrosions have been reported on the propeller shaft inside of stem tube which has no stern cooling system. Crevice corrosion, galvanic corrosion and stray current have been suspected as the problem. In this study the reason of those abnormal corrosions have been tried to reveal in terms of both material and electrochemical point of views. In addition cathodic protection with sacrificial anode has been attempted to mitigate the corrosion both in laboratory and in field.
김성종(Seong-Jong Kim),배일용(Il-Yong Bae) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
According to the high growth of industry, demand of stainless steel is increasing continuously because the corrosion resistance is excellent due to formation of dense passivity oxidation film. 316 stainless steel where adds 2~3% Mo was improved pitting resistance, 316L stainless steel where adds 0.03% C was upgraded intergranular corrosion. Therefore, in order to compare 316 stainless steel and 316L stainless steel investigated anodic polarization, EIS, DL-EPR experiment. Through these experiment and investigation, following results have been obtained ; In the case of anodic polarization and electrochemical EIS analysis, corrosion resistance of 316L stainless steel was appeared excellent. However, in DL-EPR analysis, intergranular corrosion of 316 stainless steel was observed excellent.
천연해수 중 전류밀도 변화에 따라 형성된 환경친화적인 전착 코팅막의 특성 분석
이찬식(Chan-Sik Lee),배일용(Il-Yong Bae),김기준(Ki-Joon Kim),문경만(Kyung-Man Moon),이명훈(Myeong-Hoon Lee) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.5
Calcareous deposits are the consequence of pH increase of the electrolyte adjacent to metal surface affected by cathodic current in seawater. It obviously has several advantages over conventional coatings, since the calcareous deposit coating is formed from coating (Mg²?, Ca²?) naturally existing in seawater. In consideration of this respect, environment friendly calcareous deposit films were formed by an electro deposition technique on steel substrates submerged in 48℃ natural seawater. And the influence of current density, coating time and attachment of steel mesh on composition ratio, structure and morphology of the electrodeposited films were investigated by Scanning Electron Microscopy(SEM), Energy Dispersive Spectroscopy(EDS) and X-Ray Diffractor(XRD), respectively. Accordingly, this study provides a better understanding of the composition between the growth of Mg(OH)₂ and CaCO₃ during the formation of electro deposit films on steel substrate under cathodically electrodeposition in 48℃ natural seawater. The Mg compositions, in general, are getting decreased regardless of current density but Ca compositions are getting increased as electrodeposition time runs. That is, Mg(OH)₂ compounds of brucite structure shaped as flat type is formed at the initial stage of electrodeposition, but CaCO₃, compounds of aragonite structure shaped as flower type is formed in large scale. Besides, Mg(OH)₂ compounds were much formed at 5 A/㎡ environment condition compared to the 3 A/㎡ and 4 A/㎡ environment conditions. This is because that OH? which was comparatively largely generated at the metal surface is preferably combined with Mg²?.