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임우조(Uh Joh Lim),박윤식(Yun Sik Park),박동기(Dong Gi Park) 한국가스학회 2008 한국가스학회지 Vol.12 No.4
본 연구는 pH환경 중에서 고주파 열처리한 강인주철의 마멸 부식거동을 pH환경 중에서의 접촉압력에 따른 마멸부식거동, 침지 부식 후 부식마멸거동 및 전기화학적 부식거동에 대해 고찰하였다. 응축수의 pH가 낮아질수록 마멸부식율은 급격히 증가하고, 전기화학적 양극분극에 의한 강인주철의 부식양상은 중성에서 가늘고 긴 흑연의 편상조직이 나타나지만, 강산성 중에서는 흑연이탈 현상으로 표면이 거칠게 나타난다. This paper studies on the wear corrosion behavior of induction hardening high strength cast iron in the acidic environments. In a variety of pH solutions, wear corrosion behavior of GC 300 with a variety of contact pressures was investigated, and corrosion wear behavior after immersion test was considered. Also, electrochemical polarization test for GC 300 was carried out in various pH solutions. The main results are as following: In the strong acidic environment, wear corrosion rate of GC 300 appears highly and in the neutral environment is stable. Also, graphitic corrosion in the strong acidic environment occurs. The corrosion current density of GC 300 becomes high in a order of pH 1 > pH 2 > pH 4 > pH 6.5.
해양환경 중에서 Glass Flake 라이닝 강재의 부식과 캐비테이션 침식 방지에 관한 연구
임우조(Uh Joh Lim),김성훈(Seong Hoon Kim) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
Port facilities and marine structures used in marine environment were encountered to corrosion damages because of the influence of CI-. Generally, to protect these accidents, mainly applied anti-corrosion paint and epoxy coating. But it was still remained erosion-corrosion damage such as impingement erosion, cavitation erosion, deposit attack. There was needs to develope the new coating materials to protective those corrosion damages.<br/> This paper, polyester glass flake, vinylester glass flake lining and epoxy coating for SS400 were investigated electrochemical tests and cavitation erosion test for corrosion behaviour under sea water.<br/> The main results obtained are as follows ;<br/> 1) Surface of epoxy coating appear erosion pin hole but surface of polyester glass flake and vinylester glass flake lining do not appear erosion pin hole after impingement-cavitation erosion test in sea water.<br/> 2) Weight loss of polyester glass flake and vinylester glass flake lining do not occur after impingement-cavitaton erosion test in sea water.<br/> 3) Corrosion current density of polyester glass flake lining less drained than epoxy coating and substrate under corrosion potential..<br/> 4) Corrosion current density of vinylester glass flake lining with three coating less drained than that of polyester glass flake lining with two coating.
임우조(Uh Joh Lim),윤병두(Byoung Du Yun) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
The crevice corrosion of local corrosion occur when the gap exist on metal surface. This crevice corrosion happen to region such as flange of pipe, contact part of casing, under gasket and packing, between valve disk and seat of pump etc. Especially The crevice corrosion of mild steel(SS 400) get serious.<br/> This paper was studied on the crevice corrosion of SS 400 in fluid environment. In 0%, 2%, 3.5%, 5% NaCl solution, the aspect of the crevice corrosion and polarization behavior under the crevice corrosion was investigated. And Weight loss rate of SS 400 with crevice and non-crevice was measured according to the NaCI concentration.<br/> The main results obtained are as follows :<br/> 1) Under crevice corrosion, the corrosion potential become less noble as the concentration of NaCl solution increased.<br/> 2) The current density under open circuit potential was high drained as concentration of NaCl solution increased by 3.5% but the concentration increased over 3.5%, the current density was low drained.<br/> 3) The weight loss rate of SS400 was increased as concentration of NaCl solution increased by 3.5%, but the concentration increased over 3.5%, that of SS400 was decreased.<br/> 4) Effect of oxygen for crevice corrosion in the concentration of 3.5% NaCl solution become sensitive than that of 0% NaCl solution.