Pub Date : 2020-12-31DOI: 10.14773/CST.2020.19.6.310
Dongwook Shin, Seong-Jong Kim, 신동호, 김성종
{"title":"Investigation of Liquid Droplet Impingement Erosion Corrosion based on the Flow Rate of Anodized 5083-H321 Al Alloy in Seawater, 경질양극산화된 5083-H321 알루미늄 합금의 해수 내 액적충격침식부식 손상 연구","authors":"Dongwook Shin, Seong-Jong Kim, 신동호, 김성종","doi":"10.14773/CST.2020.19.6.310","DOIUrl":"https://doi.org/10.14773/CST.2020.19.6.310","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41331082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-31DOI: 10.14773/CST.2020.19.6.318
Hyun-kyu Hwang, Seong-Jong Kim, 황현규, 김성종
{"title":"Electrochemical Characteristics with Cavitation Amplitude Under Cavitation Erosion of 6061-T6 in Seawater, Al 6061-T6 합금의 해수 내 캐비테이션 진폭에 따른 캐비테이션-침식 조건하에서 전기화학적 특성","authors":"Hyun-kyu Hwang, Seong-Jong Kim, 황현규, 김성종","doi":"10.14773/CST.2020.19.6.318","DOIUrl":"https://doi.org/10.14773/CST.2020.19.6.318","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46759786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.14773/CST.2020.19.5.231
Y. Jung, Y. Choo
{"title":"Comparison of Quantitative Analysis of Radioactive Corrosion Products Using an EPMA and X-ray Image Mapping","authors":"Y. Jung, Y. Choo","doi":"10.14773/CST.2020.19.5.231","DOIUrl":"https://doi.org/10.14773/CST.2020.19.5.231","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48962173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.14773/CST.2020.19.5.265
M. G. Kim, B. Lim, K. T. Kim, H. Chang, H. B. Park, Young-Sik Kim, 김민기, 임부택, 김기태, 장현영, 박흥배, 김영식
토중 매설 배관의 외부 부식은 일반적으로 배관 표면에 보호 물질을 피복하여 사용하며, 그 효과를 극대화하기 위 해서 음극방식을 병행하여 사용할 수 있다 [1-3]. 그런데 산업현장에서 발견할 수 있는 부식방지 현황은 다음과 같이 요약할 수 있다; (1) 음극 방식을 사용하지 않는 경우, (2) 방식전압만 인가하고 관리를 하지 않는 경우, (3) 데이터 로거를 이용하여 방식전위를 모니터링하는 경우, (4) 실시 간으로 방식전위를 감시하는 경우, (5) 실시간으로 방식상 태를 감시하고 제어를 하는 경우 등이 있다 [4]. 이상과 같 이 다양한 방법으로 매설배관을 관리하고 있으나, 매설배관 외면의 피복 열화 및 손상이 유발될 수 있다. 예를 들어, 배관 설치 시 손상, 운전 및 작동 중 손상, 부적절한 표면 청소로 인한 손상 등 이 있다 [5-7]. 따라서 피복의 손상 및 열화가 유발되었을 때 손상부위를 정확히 탐상하여 이후 에 나타날지도 모르는 배관의 부식을 예방하는 것이 중요하 다 [8-10]. 원자력 발전소의 경우, 매설된 배관의 피복 결함에 대한 평가시 적절한 검사법을 사용하여야 한다. 가장 정확한 방 법은 배관에 대하여 직접 검사를 수행하는 것이다. 그러나 이러한 방법은 검사 면적이 커짐에 따라 비효율적이므로 일반적으로는 비 파괴적인 피복 결함 탐상을 실시한다 [11]. 배관 외면의 피복 결함 탐상 기술은 직류전원을 이 †Corresponding author: yikim@anu.ac.kr 김민기: 석사과정, 임부택: 박사과정 부장, 김기태: 박사후과정, 장현영: 실장, 박흥배: 부장, 김영식: 교수 다전극 탐상을 통한 토중 매설배관 피복결함 탐상 정확도의 개선
{"title":"Enhancing the Reliability of Coating Flaw Detection for Pipes Buried in Soil Using a Multi-Electrode Detector, 다전극 탐상을 통한 토중 매설배관 피복결함 탐상 정확도의 개선","authors":"M. G. Kim, B. Lim, K. T. Kim, H. Chang, H. B. Park, Young-Sik Kim, 김민기, 임부택, 김기태, 장현영, 박흥배, 김영식","doi":"10.14773/CST.2020.19.5.265","DOIUrl":"https://doi.org/10.14773/CST.2020.19.5.265","url":null,"abstract":"토중 매설 배관의 외부 부식은 일반적으로 배관 표면에 보호 물질을 피복하여 사용하며, 그 효과를 극대화하기 위 해서 음극방식을 병행하여 사용할 수 있다 [1-3]. 그런데 산업현장에서 발견할 수 있는 부식방지 현황은 다음과 같이 요약할 수 있다; (1) 음극 방식을 사용하지 않는 경우, (2) 방식전압만 인가하고 관리를 하지 않는 경우, (3) 데이터 로거를 이용하여 방식전위를 모니터링하는 경우, (4) 실시 간으로 방식전위를 감시하는 경우, (5) 실시간으로 방식상 태를 감시하고 제어를 하는 경우 등이 있다 [4]. 이상과 같 이 다양한 방법으로 매설배관을 관리하고 있으나, 매설배관 외면의 피복 열화 및 손상이 유발될 수 있다. 예를 들어, 배관 설치 시 손상, 운전 및 작동 중 손상, 부적절한 표면 청소로 인한 손상 등 이 있다 [5-7]. 따라서 피복의 손상 및 열화가 유발되었을 때 손상부위를 정확히 탐상하여 이후 에 나타날지도 모르는 배관의 부식을 예방하는 것이 중요하 다 [8-10]. 원자력 발전소의 경우, 매설된 배관의 피복 결함에 대한 평가시 적절한 검사법을 사용하여야 한다. 가장 정확한 방 법은 배관에 대하여 직접 검사를 수행하는 것이다. 그러나 이러한 방법은 검사 면적이 커짐에 따라 비효율적이므로 일반적으로는 비 파괴적인 피복 결함 탐상을 실시한다 [11]. 배관 외면의 피복 결함 탐상 기술은 직류전원을 이 †Corresponding author: yikim@anu.ac.kr 김민기: 석사과정, 임부택: 박사과정 부장, 김기태: 박사후과정, 장현영: 실장, 박흥배: 부장, 김영식: 교수 다전극 탐상을 통한 토중 매설배관 피복결함 탐상 정확도의 개선","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46130160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.14773/CST.2020.19.5.239
Yezhai Yang, Seong-Jong Kim, 양예진, 김성종
{"title":"Characteristics of Cavitation-Erosion Damage with Amplitude in Seawater of 5052-O Al Alloy for Ship, 선박용 5052-O 알루미늄 합금의 해수 내 진폭 변수에 따른 캐비테이션-침식 손상 특성","authors":"Yezhai Yang, Seong-Jong Kim, 양예진, 김성종","doi":"10.14773/CST.2020.19.5.239","DOIUrl":"https://doi.org/10.14773/CST.2020.19.5.239","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44750087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-31DOI: 10.14773/CST.2020.19.5.250
Yezhai Yang, Seong-Jong Kim, 양예진, 김성종
{"title":"Investigation on Cavitation-Erosion Damage with the Cavitation Amplitude of Al Alloy Materials in Seawater, 해수 내 다양한 알루미늄 선박용 재료의 캐비테이션 진폭에 따른 캐비테이션-침식 손상 연구","authors":"Yezhai Yang, Seong-Jong Kim, 양예진, 김성종","doi":"10.14773/CST.2020.19.5.250","DOIUrl":"https://doi.org/10.14773/CST.2020.19.5.250","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45665965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hyun-kyu Hwang, Dong-Ho Shin, Kwang-Hu Jung, and Seong-Jong Kim Graduate school, Mokpo national maritime university, Haeyangdaehak-ro, Mokpo-si, Jeollanam-do, 58628, Korea Maritime safety training team, Korea institute of maritime and fisheries technology, Haeyang-ro, Busan metropolitan city, 49911, Korea Division of marine engineering, Mokpo national maritime university, Haeyangdaehak-ro, Mokpo-si, Jeollanam-do, 58628, Korea (Received September 23, 2020; Revised October 14, 2020; Accepted October 14, 2020)
Hyun-kyu Hwang、Dong Ho Shin、Kwang Hu Jung和Seong Jong Kim研究生院，全罗南道海阳道，韩国海洋安全训练队，韩国海洋和渔业技术研究所，釜山广域市海阳路，49911，韩国海洋工程部，韩国海洋大学，海阳道，韩国全罗南道木浦寺，58628（2020年9月23日收到；2020年10月14日修订；2020年11月14日接受）
{"title":"Investigation on Electrochemical Corrosion and Stress Corrosion Cracking Characteristics of Anodized 5083-H321 Alloy in Natural Seawater, 양극산화된 5083-H321 합금의 천연해수 내 전기화학적 부식 및 응력부식균열 특성에 관한 연구","authors":"Hyun-kyu Hwang, Dongwook Shin, Kwang-Hu Jung, Seong-Jong Kim, 황현규, 신동호, 정광후, 김성종","doi":"10.14773/CST.2020.19.5.259","DOIUrl":"https://doi.org/10.14773/CST.2020.19.5.259","url":null,"abstract":"Hyun-kyu Hwang, Dong-Ho Shin, Kwang-Hu Jung, and Seong-Jong Kim Graduate school, Mokpo national maritime university, Haeyangdaehak-ro, Mokpo-si, Jeollanam-do, 58628, Korea Maritime safety training team, Korea institute of maritime and fisheries technology, Haeyang-ro, Busan metropolitan city, 49911, Korea Division of marine engineering, Mokpo national maritime university, Haeyangdaehak-ro, Mokpo-si, Jeollanam-do, 58628, Korea (Received September 23, 2020; Revised October 14, 2020; Accepted October 14, 2020)","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44422606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.14773/CST.2020.19.4.E1
Young-Bok Kim, Seong-Jong Kim
{"title":"Erratum to: Effect of Flow Rate on Erosion Corrosion Damage and Damage Mechanism of Al5083-H321 Aluminum Alloy in Seawater Environment","authors":"Young-Bok Kim, Seong-Jong Kim","doi":"10.14773/CST.2020.19.4.E1","DOIUrl":"https://doi.org/10.14773/CST.2020.19.4.E1","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45786730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.14773/CST.2020.19.4.196
Jeongmin Cho, Hobyung Chae, Heesan Kim, Jung-Gu Kim, W. Kim, Joon Cheol Jeong, Soo Yeol Lee, 조정민, 채호병, 김희산, 김정구, 김우철, 정준철, 이수열
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.
{"title":"Failure Analysis of Air Vent Connected with Heat Supply Pipeline Under Manhole, 맨홀에 설치된 지역난방 열공급관 에어벤트의 전단부 파손 원인 규명","authors":"Jeongmin Cho, Hobyung Chae, Heesan Kim, Jung-Gu Kim, W. Kim, Joon Cheol Jeong, Soo Yeol Lee, 조정민, 채호병, 김희산, 김정구, 김우철, 정준철, 이수열","doi":"10.14773/CST.2020.19.4.196","DOIUrl":"https://doi.org/10.14773/CST.2020.19.4.196","url":null,"abstract":"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.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42530609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-31DOI: 10.14773/CST.2020.19.4.211
M. G. Kim, B. Lim, K. T. Kim, H. Chang, Heung-Bae Park, Young-Sik Kim, 김민기, 임부택, 김기태, 장현영, 박흥배, 김영식
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.
{"title":"Effects of Rectifier and Copper Grid Interference on the Detection Reliability of Coating Flaws on Buried Pipes, 매설 배관 피복 결함 탐상 정확도에 미치는 인접 정류기 및 접지 구리망 간섭의 영향","authors":"M. G. Kim, B. Lim, K. T. Kim, H. Chang, Heung-Bae Park, Young-Sik Kim, 김민기, 임부택, 김기태, 장현영, 박흥배, 김영식","doi":"10.14773/CST.2020.19.4.211","DOIUrl":"https://doi.org/10.14773/CST.2020.19.4.211","url":null,"abstract":"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.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47297756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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