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ALBC3 합금의 수소과전압 현상을 이용한 캐비테이션과 전기화학적 특성
박재철(Jae-Cheul Park),이승준(Seung-Jun Lee),김성종(Seong-Jong Kim) 한국표면공학회 2011 한국표면공학회지 Vol.44 No.6
In this study, the cavitation test and electrochemical experiments were conducted for ALBC3(Cu-Al) alloy that has an excellent corrosion resistance and cavitation characteristic in sea water. Based on the ASTMG32 regulation, the cavitation test was performed with the cavitation and cavitation erosion tester using piezoelectric effect. The electrochemical characteristics are evaluated with potentiostatic experiments in activation polarization potential range. As a result, cavitation damage is increased proportionally to temperature and time at 30 μm amplitude. It is appeared that acceleration period in weight loss presented over 6 hours under the cavitation environment in sea water. In addition, corrosion damages were observed at the potential range of -3.2~-1.4 V as the result of potensiostatic experiments during 12 hours in activation polarization potential range.
해양환경 하에서 동합금의 캐비테이션-부식손상 방지를 위한 방식정전류 기법 연구
박재철(Jae-Cheul Park),김성종(Seong-Jong Kim) 한국표면공학회 2012 한국표면공학회지 Vol.45 No.1
The galvanostatic tests for corrosion protection are conducted at various applied current densities during 93,600 sec, and evaluated in terms of the variations in current density with time and in the potential at the applied current density. In addition, the corrosion damage depth is analyzed with 3D analysis optical microscope after galvanostatic tests. In this study, it was investigated to decide condition of the corrosion protection gavalnostatic method for Cu-Al alloy that has an excellent corrosion resistance. In the galvanostatic test under the cavitation environment, the energy was reflected or cancelled out by the collision with the oxygen gas generated by the oxygen reduction action. The surface observation showed neither the cavitation damage nor the electrochemical damage in the current density over 0.01 A/㎠ in the dynamic state under the cavitation environment.
해상구조물의 방식설계 최적화를 위한 설계요건 분석 및 시간의존적 방식성능 해석
박재철(Jae-Cheul Park),최유열(Yoo-Youl Choi),편강일(Kang-Il Pyeon),천강우(Kang-Woo Chun),장화섭(Hwa-Sup Jang),노길태(Gill-Tae Roh) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.5
The offshore structures exposed to harsh corrosive such as the marine environment is essential for the quality management technique throughout the life cycle of initial design, construction and operation. Also, it should satisfy the design life and ensure the safety of the substructure with optimization of design process. This study focused on optimization of design condition for corrosion protection of wind turbine structure and computational analyzing was performed to evaluate the performance of corrosion protection with utilizing practical experimental data. We expect this analytical study contribute to improve the corrosion maintenance stability and economical efficiency of designing wind turbine structures. As a result, the design of cathodic protection system using sacrificial anodes required accurate identification of current density in order to meet the long term design life, which can be seen that a change of structure surface’s coating breakdown factor is one of the key influencing factors.
알루미늄 5456-H116 합금에 대하여 최적 마찰교반 프로세싱 조건 규명 및 기계적 특성 평가
박재철(Jae-Cheul Park),김성종(Seong-Jong Kim) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.1
Friction stir welding(FSW) was developed as a new solid state welding technique by The Welding Institute (TWI). On the basis of FSW, a new processing technique, friction stir processing (FSP), has recently been developed. FSP has been applied to cast aluminum alloy to modify the microstructure to enhance mechanical characteristic. FSP is a new solid state processing technique for microstructural modification in metallic materials. FSP has been applied to aluminum alloy to modify the microstructure to enhance mechanical characteristic. In this study, we investigated optimum condition friction stir processing with the evaluation of mechanical characteristic for 5456-H116 Al alloy. The mechanical characteristics of base metal similar with in 15 ㎜/min, 250 RPM with full screw probe. This condition is concluded that optimum friction stir processing condition. The result of this investigation will be able to application for repair of welding part for aluminum ship.