한국재료부식학회

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Page : 120 - 128 DOWNLOAD
SA508 Gr3 Cl2 저합금강과 용접부의 290℃ 수화학 환경에서 피로균열거동 분석
AUTHORs : 조평연 ( Pyung Yeon Cho ) , 김정현 ( Jeong Hyeon Kim ) , 장창희 ( Chang Heui Jang ) , 조현철 ( Hyun Chul Cho )

Page : 135 - 140 DOWNLOAD
분극저항에 의한 온라인 부식속도 측정 시스템에 관한 연구
AUTHORs : 문전수 ( Jeon Soo Moon ) , 이재근 ( Jae Kun Lee ) , 이재봉 ( Jae Bong Lee ) , 박필양 ( Pyl Yang Park )

Page : 157 - 164 DOWNLOAD
Examination on Required Cover Depth to Prevent Reinforcement
In first experiment series, this paper is devoted for examining progress of reinforcement corrosion due to carbonation in concrete and to quantify uncarbonation depth to protect reinforcement from corroding. The tolerance of cover depth should be considered in order to prevent carbonation-induced corrosion. From
the relationship between the weight loss of reinforcement and corrosion current density for a given time, therefore, the tolerance of cover depth to prevent carbonation-induced corrosion is computed. It is observed that corrosion occurs when the distance between carbonation front and reinforcement surface (uncarbonated depth) is smaller than 5 mm.As a secondary purpose of this study, it is investigated to examine the interaction between carbonation and chloride penetration and their effects on concrete. This was examined experimentally
under various boundary conditions. For concrete under the double condition, the risk of deterioration due to carbonation was not severe. However, it was found that the carbonation of concrete could significantly accelerate chloride penetration. As a result, chloride penetration in combination with carbonation is a serious cause of deterioration of concrete.
KEYWORDs : carbonation, chloride penetration, reinforcement corrosion, uncarbonation depth, deterioration
AUTHORs : In-Seok Yoon

Page : 165 - 172 DOWNLOAD
Effect of Surface Pretreatment on the Corrosion Resistance of
The corrosion resistance of epoxy-coated carbon steel was evaluated. The carbon steel surface was subjected to different treatment methods such as steel grit blasting with different size, steel shot ball blasting and power tool treatment. To study the effect of the treatments, the topology of the treated surface was observed
by optical 3D microscopy and a pull-off adhesion test was conducted. The corrosion resistance of the epoxy-coated carbon steel was further examined by electrochemical impedance spectroscopy (EIS) combined with hygrothermal cyclic testing. The results of EIS indicated that the epoxy-coated carbon steel treated with
steel grit blasting showed an improved corrosion resistance compared to untreated epoxy-coated surfaces or surfaces subjected to shot ball blasting and power tool treatments.
KEYWORDs : EIS, Epoxy, Blasting, Hygrothermal, Adhesion
AUTHORs : DongHo Lee, JinHwan Park, and MinYoung Shon†

Page : 173 - 178 DOWNLOAD
탄소강배관 다중 UT 측정두께를 활용한 감육여부 판별법 개발
To manage the wall thinning of carbon steel piping in nuclear power plants, the utility of Korea has performed thickness inspection for some quantity of pipe components during refueling outages and determined whether repair or replacement after evaluating UT (Ultrasonic Test) data. When the existing UT data evaluation methods, such as Band, Blanket, PTP (Point to Point) Methods, are applied to a certain pipe component, unnecessary re-inspecting situations may be generated even though the component does not thinned. In those cases, economical loss caused by repeated inspection and problems of maintaining the pipe integrity followed by decreasing of newly inspected components may be generated. EPRI (Electric Power Research Institute) in USA has suggested several statistical
methods, TPM (Total Point Method), LSS (Least Square Slope) Method, etc. to distinguish whether multiple inspecting components have thinned or not. This paper presents the analysis results for multiple inspecting components over three times based on both NAM (Near Area of Minimum) Method developed by KEPCO-E&C and the other methods suggested by EPRI.
KEYWORDs : pipe wall thinning, multiple inspection, ANOVA-1 method, TPM, NAM method
AUTHORs : 황경모†? 윤훈? 이찬규

Page : 179 - 183 DOWNLOAD
API RP 581 Code를 기반으로한 LNG 플랜트의 Risk-Based Inspection(RBI) 기술 개발
As one of promising solutions to overcome high oil price and energy crisis, the construction market of high value-added LNG plants is spotlighted world widely. The purpose of this study is to introduce LNG-RBI system to develop risk assessment technology with RAM(Reliability, Availability, Maintainability) modules against overseas monopolization. After analyzing relevant specific features and their technical levels, risk assessment program, non-destructive reliability evaluation strategy and safety criteria unification class are derived as core technologies.
These IT-based convergence technologies can be used for enhancement of LNG plant efficiency, in which the modular parts are related to a system with artificial optimized algorithms as well as diverse databases of facility inspection and diagnosis fields.
KEYWORDs : information technology, LNG plant, reliability, risk based inspection, risk assessment
AUTHORs : 최송천†, 최재붕, 황인주

Page : 184 - 190 DOWNLOAD
동합금의 워터캐비테이션피닝에 의한 내구성과 부식특성 평가
Cu alloy is widely used for marine applications due to its excellent ductility and high resistance for corrosion as wells as cavitation. However, long term exposure of the material to marine environments may result in damages caused by cavitation and corrosion. Water cavitation peening has been introduced in order to improve resistance of Cu alloy to corrosion and cavitation. The technology induces compressive residual stress onto the surface, and thus enhances the fatigue strength and life. In this study, the characteristics of the material were investigated by using water cavitaiton peening technique, and results showed that 2 minutes of water cavitation peening indicated the considerable improvement in hardness.
On the other hand, over 10 minutes of water cavitation peening accelerated damages to the surface. In the case of ALBC3, water cavitation peening in the range of 2 to 10 minutes has shown the excellent durability and corrosion resistance while minimizing surface damages.
KEYWORDs : Cu alloy, cavitation, compressive residual stress, water cavitation peening, plastic deformation
AUTHORs : 김성종? 한민수†? 김민성

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