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한국부식방식학회(구 한국부식학회)> Corrosion Science and Technology

Corrosion Science and Technology update

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수록정보
수록범위 : 1권1호(2002)~19권4호(2020) |수록논문 수 : 830
Corrosion Science and Technology
19권4호(2020년 08월) 수록논문
최근 권호 논문
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KCI등재

1Effects of Ultrasonic Amplitude on Electrochemical Properties During Cavitation of Carbon Steel in 3.5% NaCl Solution

저자 : I. J. Jang , K. T. Kim , Y. R. Yoo , Y. S. Kim

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 19권 4호 발행 연도 : 2020 페이지 : pp. 163-173 (11 pages)

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Cavitation corrosion in many industrial plants has recently become a serious issue. Cavitation corrosion has generally been investigated using a vibratory method based on ASTM G32 standard, and the test can be divided into direct cavitation and indirect cavitation. Cavitation corrosion test uses the vibration frequency of the horn of 20 kHz with constant peak-to-peak displacement amplitude. In this work, the peak-to-peak amplitude was controlled from 15 μm to 85 μm, and electrochemical measurements were obtained during indirect cavitation. The relationship between cavitation corrosion rate and electrochemical properties was discussed. Corrosion steps of carbon steel at the initial stage under cavitation condition in 3.5 % NaCl can be proposed. When the cavitation strength is relatively low, corrosion of the steel is more affected by the electrochemical process than by the mechanical process; but when the cavitation strength is relatively high, corrosion of the steel is affected more by the mechanical process than by the electrochemical process. This work confirmed that the critical ultrasonic amplitude of 0.42 %C carbon steel is 53.8 μm, and when the amplitude is less than 53.8 μm, the corrosion effect during the cavitation corrosion process is higher than the mechanical effect.

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2Comprehensive Empirical Equation for Assessing Atmospheric Corrosion Progression of Steel Considering Environmental Parameters

저자 : Arjun Sil†and , Vanapalli Naveen Kumar

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 19권 4호 발행 연도 : 2020 페이지 : pp. 174-188 (15 pages)

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Atmospheric corrosion is a natural surface degradation process of metal due to changes in environmental parameters in the surrounding atmosphere. It is very sensitive to environmental parameters such as temperature, relative humidity, sulphur dioxide, and chloride, making it a major global economic challenge. Existing forecasting empirical corrosion models including the ISO standard are based on statistical analysis of experimental studies without considering the behavior of atmospheric parameters. The present study proposes a reliable global empirical model for estimating short and long-term atmospheric corrosion rates based on environmental parameters and corrosion mechanisms obtained from a parametric study. Repercussion of atmospheric corrosion rate due to individual and combined influences of environmental parameters specifies their importance in the estimation. New global empirical coefficients obtained for environmental parameters are statistically established (R2 =0.998) with 95% confidence limit. They are validated using experimental datasets of existing studies observed at 88 different continental locations. The current proposed model can predict atmospheric corrosion by means of corrosion formation mechanisms influenced by combined effects of environmental parameters, further abating applicability limitations of location and time.

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3지역난방수 공급관 에어벤트 부식 파손 분석

저자 : 이형준 ( Hyongjoon Lee ) , 채호병 ( Hobyung Chae ) , 조정민 ( Jeongmin Cho ) , 김우철 ( Woo Cheol Kim ) , 정준철 ( Joon Cheol Jeong ) , 김희산 ( Heesan Kim ) , 김정구 ( Jung-gu Kim ) , 이수열 ( Soo Yeol Lee )

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 19권 4호 발행 연도 : 2020 페이지 : pp. 189-195 (7 pages)

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Two air vents situated on a heat transport pipe in district heating system were exposed to the same environment for 10 years. However, one air vent was more corroded than the other. It also had a hole on the top of the front-end pipe. Comparative analysis was performed for these air vents to identify the cause of corrosion and establish countermeasures. Through experimental observation of the damaged part and analyses of powders sampled from air vents, it was found that corrosion was initiated at the top of the front-end pipe. It then spread to the bottom. Energy dispersive X-ray spectroscopy results showed that potassium and chlorine were measured from the corroded product in the damaged air vent derived from rainwater and insulation, respectively. The temperature of the damaged air vent was maintained at 75 ~ 120 °C by heating water. Rainwater-soaked insulation around the front-end pipe had been hydrolyzed. Therefore, the damaged air vent was exposed to an environment in which corrosion under insulation could be facilitated. In addition, ion chromatography and inductively coupled plasma measurements indicated that the matrix of the damaged front-end pipe contained a higher manganese content which might have promoted corrosion under insulation.

KCI등재

4맨홀에 설치된 지역난방 열공급관 에어벤트의 전단부 파손 원인 규명

저자 : 정민 ( Jeongmin Cho ) , 채호병 ( Hobyung Chae ) , 김희산 ( Heesan Kim ) , 김정구 ( Jung-gu Kim ) , 김우철 ( Woo Cheol Kim ) , 정준철 ( Joon Cheol Jeong ) , 이수열 ( Soo Yeol Lee )

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 19권 4호 발행 연도 : 2020 페이지 : pp. 196-202 (7 pages)

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The air vent connected to a heat supply pipeline in the district heating system has been used to eliminate the existing air in the pipe, which has a detrimental effect on corrosion durability and heat efficiency. Recently, the air vent installed under a manhole for 22 years was corroded and several pinholes were detected in the front-end of the air vent. To identify the cause of the failure, thickness reduction, corrosion products, and water quality were examined. The corrosion damage was significant at the outside of the front-end of the air vent where the insulator was covered. While a thin oxide layer was formed in the interior of the tube, the coarse and porous corrosion products consisting of magnetite and hematite were found externally. Water flowing into the thermal insulator was absorbed by the insulator following hydrolysis. The hydrolyzed insulator ejected the corrosion factors such as Cl-, SO4 2-, and NH4 +. The findings suggest that the corrosion under insulation due to rain water is the main cause of the underlying failure in the air vent.

KCI등재

5슈퍼 오스테나이트계 스테인리스강의 시그마상 특성에 따른 부식거동 분석

저자 : 김예은 ( Ye Eun Kim ) , 박진성 ( Jin-seong Park ) , 조동민 ( Dong Min Cho ) , 홍승갑 ( Seung Gab Hong ) , 김성진 ( Sung Jin Kim )

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 19권 4호 발행 연도 : 2020 페이지 : pp. 203-210 (8 pages)

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The corrosion behavior of super austenitic stainless steel was studied by examining the characteristics of the sigma phase formed in the steel. A range of experimental and analytical methods was employed, including potentiodynamic polarization tests, critical pitting temperature tests, transmission electron microscopy, and energy-dispersive spectroscopy. Three steel samples with different sigma phase levels were obtained by intentionally adjusting the manufacturing process. The results showed that the corrosion resistance of the samples was strongly dependent upon the size and distribution of the sigma phase precipitated in the samples. The larger the size of the sigma phase, the higher the Mo content in the sigma phase and the higher the depletion level of Mo at the interface between the matrix/sigma phase, the more samples with a coarse-sized sigma phase were susceptible to localized pitting corrosion at the interface. These results suggest that various manufacturing processes, such as welding and the post-heat treatment of the steel, should be optimized so that both the size and fraction of the sigma phase precipitated in the steel are small to improve the resistance to localized corrosion.

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6매설 배관 피복 결함 탐상 정확도에 미치는 인접 정류기 및 접지 구리망 간섭의 영향

저자 : 김민기 ( M. G. Kim ) , 임부택 ( B. T. Lim ) , 김기태 ( K. T. Kim ) , 장현영 ( H. Y. Chang ) , 박흥배 ( H. B. Park ) , 김영식 ( Y. S. Kim )

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 19권 4호 발행 연도 : 2020 페이지 : pp. 211-223 (13 pages)

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The external corrosion of buried piping can be controlled using both coating and cathodic protection. Several factors are involved in the damage and deterioration of the coating on pipes. There are many detection methods for coating defects on pipes and the direct current voltage gradient (DCVG) method is one of the most powerful methods. However, the detection reliability of DCVG can be affected by interferences such as stray current, metal objects connected to rectifiers, and copper grids. Therefore, this study focused on the interference effects of rectifiers and a copper grid on the reliability of coating flaw detection. As the length of the interference pipe connected to the rectifier increased, the reliability decreased. In contrast, as the distance between the pipe and the copper grid increased, the reliability of the coating flaw detection increased. The detection results produced by the DCVG method were discussed using current and potential simulations for a pipe with a rectifier and copper grid interference in the soil.

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7해수분위기에서 스테인리스강 배관 소켓 용접부의 선택적 부식

저자 : 부명환 ( Myung-hwan Boo ) , 이장욱 ( Jang-wook Lee ) , 이종훈 ( Jong-hoon Lee )

발행기관 : 한국부식방식학회(구 한국부식학회) 간행물 : Corrosion Science and Technology 19권 4호 발행 연도 : 2020 페이지 : pp. 224-230 (7 pages)

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Stainless steel has excellent corrosion resistance. The drawback is that pitting occurs easily due to the concentration of chloride. In addition, corrosion of socket weld, which is structurally and chemically weaker than the other components of the pipe, occurs rapidly. Since these two phenomena overlap, pinhole leakage occurs frequently in the seawater pipe socket welds made of stainless steel at the power plants. To analyze this specific corrosion, a metallurgical analysis of the stainless steel socket welds, where the actual corrosion occurred during the power plant operation, was performed. The micro-structure and chemical composition of each socket weld were analyzed. In addition, selective corrosion of the specific micro-structure in a mixed dendrite structure comprising γ-austenite (gamma-phase iron) and δ-ferrite (iron at high temperature) was investigated based on the characteristic micro-morphology and chemical composition of the corroded area. Finally, the different corrosion stages and characteristics of socket weld corrosion are summarized.

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

(2006)홍길동 외 1명심리학41회 피인용

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