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조선용 C-Mn 강의 제조방법에 따른 미생물 부식 특성 연구
鄭歡敎,兪張鎔,禹宗秀 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.6
The MIC(Microbiologically Influenced Corrosion) of lower deck steel plates in double hull VLCC(Very Large Crude Oil Carrier) cargo tanks has been focused because of severe localized corrosion. Recently, ship companies have reported that TMCP(Thermomechanical Control Process) steel plates have been showed more severe localized corrosion than conventional rolled steels. In order to elucidate the MIC resistance of TMCP steels by comparison with conventional rolled steels and normalized steels in environments of double hull VLCC cargo oil tanks, various measurements and corrosion tests were performed such as measurements of polarization curves, immersion tests in bacteria culture medium. All results revealed that three types of steels have almost the same corrosion resistance in bacteria culture medium. Three kinds of steel exhibit almost the same polarization behavior and the corrosion rate. The movement of the open-circuit potential first towards more negative values and later to more positive values is a phenomenon common to all kinds of specimens. This phenomenon resulted from an initial stimulation of the anodes by sulphide ions produced by the bacteria from the reduction of sulphate ions in the medium, followed by the formation of an insoluble partly protective film of ferrous sulphide on the surface of the electrode. The effect of SRB (Sulphate Reducing Bacteria) is clearly showed in the cathodic polarization curve. When the SRB is in a condition of rapid growth, there is a strong cathodic depolarization. However, as the sulphate is depleted and reaction products accumulate, the activity of the bacteria declines and the cathodic polarization curve returns the same form as in the inoculated culture.
정환교,안규중,이철현,이종주 ( Hwan Gyo Jeong,Kyu Joong Ahn,Cheol Heon Lee,Chong Ju Lee ) 대한피부과학회 1988 대한피부과학회지 Vol.26 No.2
We experienced a case of cutis laxa in a 17-year-old man. The skin showed diminished elasticity with loose folds, wrinkling, and sagging on the abdomen, lower back, and both inner thighs. There was no history of any inflammatory skit diseases prior to the appearance of the wrinkling. Family history revealed to be negative for the skin diseases showing wrinkling and laxity. The biopsy specimen from the skin of the abdomen showed shortened, fragmented elastic fibers in the dermis. The serum copper level was normal(92 ug/dl).