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연구논문초록(’81-’90) : 탄소강과 스텐레스강의 부식거동의 차이점에 대한 전기화학적 연구
문경만 한국부식학회 1991 Corrosion Science and Technology Vol.20 No.1
The variations of corrosion potentials and polarization behaviors affecting corrosion current density of carbon steel and stainless steel were investigated in NaCl and H₂SO₄ solution. Then corrosion potentials shifted to negative direction with submerged time in NaCl solution, corrosion current density was slightly decreased in carbon steel while was gradually increased in stainless steel. Therefore it is considered that corrosion potentials of stainless steel are determined by activation polarization of reduction reaction of dissolved oxygen, on the other hand carbon steel's corrosion potential are determined by concentration polarization of it. These two steels showed different behaviors from each other also in H₂SO₄ solution on the variations of corrosion poltentials and polarization behaviors according to concentration of H₂SO₄solution. Eventually it is suggested that in carbon steel the corrosion behavior is controlled by polarization and depolarization reaction of cathode while in stainless steel its behavior is controlled by those of anode both in NaCl and H₂SO₄ solution.
문경만,조황래,이명훈,김현명,이인원,전호환 한국해양공학회 2007 韓國海洋工學會誌 Vol.21 No.3
There are many kinds of protection methods for marine structures, with varyingeconomical and environmental advantages. The coating protection method is being widely used in both continental and marine structures. In this study, by adding some additives, such as Zn powder(Zn), carbon black(CB) to epoxy anti-corrosive paint, the effect on the corrosion resistance was investigated throughan electrochemical method. The additive of Zn(20)+CB(10) showed the lowest passivity current density. Polarization resistance in both cyclic voltammogram and impedance measurement of an additive of Zn(20)+CB(10) was also the largest value, compared to other additives. Furthermore, rusting and bubbling was not observed on the surface of the test specimen with the additive of Zn(20)+CB(10), compared to other specimens. It is suggested that the corrosion resistance of the anti-corrosive paint can be improved by using some additives.1. 서 론 최근 산업사회의 급격한 발전과 함께 육. 해상의 강구조물 등은 가혹한 부식 환경에 노출되어 있다고 해도 과언이 아니다. 또한 이들 구조물 등은 부식을 억제하기 위해서 적절한 방법으로 방식되고 있다. 예를 들면 육해상의 강교, 부두크레인 등의 구조물 등은 도장에 의해서 방식되고 있으며 부두의 수중 강파일등은 전기방식법으로 방식되고 있다(Compton, 1961; Talati et al., 1984; Gartland et al., 1984; Jones and Nair, 1985; Newman, 1991; Cicognami, 1990; Hiramatsi et al., 1996; OCDI of Japan, 1998). 그리고 일본의 한 보고서에 의하면 각종 강구조물의 방식대책비 중 표면도장에 의한 경비가 약 63%를 차지하고 있는 것으로 보고 되고 있다(부식손실조사보고서, 1977).
The Pitting Inhibition of Fe-Cu Alloy in Weakly Alkaline Solution under Wet-Dry Condition
문경만,김제경,강태영 한국전기화학회 2007 한국전기화학회지 Vol.10 No.3
Pure iron, Fe-0.4, and 1.2 wt.%Cu alloys were examined by conducting the electrochemical techniques inthe weakly alkaline solution, pH9, controlled by Ca(OH)2 solution added with 0.02M NaCl. The Rp measured fromac impedance, selected 10 kHz and 10mHz, in weakly alkaline solutions containing chloride ions indicated that theaddition of copper up to 1.2wt.% into the pure iron significantly improved the pitting resistance of iron. In contrastto alloy, the pure iron showed the rapid pitting occurencespotential of pure iron was shifted to less noble value, pitting initiation.