Corrosion Science and Technology-Korea最新文献_第7页

Corrosion Failure Analysis of Air Vents Installed at Heat Transport Pipe in District Heating System 区域供热系统热传导管道通风口腐蚀失效分析

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Corrosion Science and Technology-Korea Pub Date : 2020-01-01 DOI: 10.14773/CST.2020.19.4.189

Hyongjoon Lee, H. Chae, J. Cho, W. Kim, J. Jeong, Heesan Kim, Jung-Gu Kim, S. Lee

{"title":"Corrosion Failure Analysis of Air Vents Installed at Heat Transport Pipe in District Heating System","authors":"Hyongjoon Lee, H. Chae, J. Cho, W. Kim, J. Jeong, Heesan Kim, Jung-Gu Kim, S. Lee","doi":"10.14773/CST.2020.19.4.189","DOIUrl":"https://doi.org/10.14773/CST.2020.19.4.189","url":null,"abstract":"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.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":"19 1","pages":"189-195"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66633275","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}

引用次数: 0

Effects of Ultrasonic Amplitude on Electrochemical Properties During Cavitation of Carbon Steel in 3.5% NaCl Solution 超声振幅对碳钢在3.5% NaCl溶液中空化过程中电化学性能的影响

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Corrosion Science and Technology-Korea Pub Date : 2020-01-01 DOI: 10.14773/CST.2020.19.4.163

I. J. Jang, Ki Tae Kim, Y. Yoo, Young-Sik Kim

{"title":"Effects of Ultrasonic Amplitude on Electrochemical Properties During Cavitation of Carbon Steel in 3.5% NaCl Solution","authors":"I. J. Jang, Ki Tae Kim, Y. Yoo, Young-Sik Kim","doi":"10.14773/CST.2020.19.4.163","DOIUrl":"https://doi.org/10.14773/CST.2020.19.4.163","url":null,"abstract":"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.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":"19 1","pages":"163-173"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66633221","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}

引用次数: 2

Corrosion Resistance of Mg-Added Galvannealed Steel Sheets with Nano-Composite Coating 纳米复合镀层加镁镀锌钢板的耐蚀性

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Corrosion Science and Technology-Korea Pub Date : 2020-01-01 DOI: 10.14773/CST.2020.19.2.57

D. Jo, Sang-Man Yun, D. Paik, M. Kim, M. Hong

引用次数: 0

Analysis of the Corrosion Behavior According to the Characteristics of Sigma Phase Formed in Super Austenitic Stainless Steel 根据超级奥氏体不锈钢形成的Sigma相特征分析其腐蚀行为

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Corrosion Science and Technology-Korea Pub Date : 2020-01-01 DOI: 10.14773/CST.2020.19.4.203

Ye Eun Kim, Jin-seong Park, D. Cho, Seunggab Hong, S. Kim

{"title":"Analysis of the Corrosion Behavior According to the Characteristics of Sigma Phase Formed in Super Austenitic Stainless Steel","authors":"Ye Eun Kim, Jin-seong Park, D. Cho, Seunggab Hong, S. Kim","doi":"10.14773/CST.2020.19.4.203","DOIUrl":"https://doi.org/10.14773/CST.2020.19.4.203","url":null,"abstract":"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.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":"19 1","pages":"203-210"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66632827","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}

引用次数: 0

Corrosion and Photo-Reflection Behavior of Aluminum and Stainless Steel During Immersion Test in Salt Solution 铝和不锈钢在盐溶液浸泡试验中的腐蚀和光反射行为

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Corrosion Science and Technology-Korea Pub Date : 2020-01-01 DOI: 10.14773/CST.2020.19.3.109

S. Cho, H. Na, Hye-Ri Cho, Jong-Ju Moon, T. Ahn, H. Jang

引用次数: 0

Comprehensive Empirical Equation for Assessing Atmospheric Corrosion Progression of Steel Considering Environmental Parameters 考虑环境参数的钢大气腐蚀过程综合经验方程

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Corrosion Science and Technology-Korea Pub Date : 2020-01-01 DOI: 10.14773/CST.2020.19.4.174

Arjun Sil, Vanapalli Naveen Kumar

{"title":"Comprehensive Empirical Equation for Assessing Atmospheric Corrosion Progression of Steel Considering Environmental Parameters","authors":"Arjun Sil, Vanapalli Naveen Kumar","doi":"10.14773/CST.2020.19.4.174","DOIUrl":"https://doi.org/10.14773/CST.2020.19.4.174","url":null,"abstract":"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.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":"19 1","pages":"174-188"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66633259","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}

引用次数: 1

Inhibition of Pitting Corrosion Failure of Copper Tubes in Wet Sprinkler Systems 湿式喷水灭火系统中铜管点蚀失效的抑制

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Corrosion Science and Technology-Korea Pub Date : 2020-01-01 DOI: 10.14773/CST.2020.19.2.89

S. Suh, Youngjoon Suh, Jonghyuk Lee, H. Kwon

{"title":"Inhibition of Pitting Corrosion Failure of Copper Tubes in Wet Sprinkler Systems","authors":"S. Suh, Youngjoon Suh, Jonghyuk Lee, H. Kwon","doi":"10.14773/CST.2020.19.2.89","DOIUrl":"https://doi.org/10.14773/CST.2020.19.2.89","url":null,"abstract":"The inhibition of pitting corrosion failure of copper sprinkler tubes in wet sprinkler systems was studied. First, an apparatus and technology for removing air in the sprinkler tubes by vacuum pumping and then filling the tubes with water were developed. Using this apparatus and technology, three methods for inhibiting the pitting corrosion of the copper sprinkler tubes installed in several apartment complexes were tested. The first one was filling the sprinkler tubes with water bubbled by high-pressure nitrogen gas to reduce the dissolved oxygen concentration to lower than 2 ppm. In the second method, the dissolved oxygen concentration of water was further reduced to lower than 0.01 ppm by sodium sulfite. In the third method, the sprinkler tubes were filled with benzotriazole (BTAH) dissolved in water. The third method was the most effective, reducing the failure frequency of the sprinkler tubes due to pitting corrosion by more than 80%. X-ray photoelectron spectroscopy analyses confirmed that a Cu-BTA layer was well coated on the inside surface of the corrosion pit, protecting it from corrosion. A potentiodynamic polarization test showed that BTAH should be very effective in reducing the corrosion rate of copper in the acidic environment of the corrosion pit.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":"19 1","pages":"89-99"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66633099","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}

引用次数: 1

Effects of Na 2 S, NaCl, and H 2 O 2 Concentrations on Corrosion of Aluminum, AA1100의 부식에 미치는 Na 2 S, NaCl, H 2 O 2 농도의 영향 Effects of Na 2 S, NaCl, and H 2 O 2 Concentrations on Aluminum, Na 2 S, NaCl, H 2 O 2浓度对AA1100腐蚀的影响

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Corrosion Science and Technology-Korea Pub Date : 2019-12-31 DOI: 10.14773/CST.2019.18.6.312

J. Lee, H. Jang, 이주희, 장희진

引用次数: 0

Effect of Applied Voltage on the Reliability of Coating Flaw Detection of Pipe with Different Buried Depths 外加电压对不同埋深管道涂层探伤可靠性的影响

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Corrosion Science and Technology-Korea Pub Date : 2019-12-31 DOI: 10.14773/CST.2019.18.6.277

B. Lim, M. G. Kim, Kwang-Tae Kim, H. Y. Chang, Young-Sik Kim

{"title":"Effect of Applied Voltage on the Reliability of Coating Flaw Detection of Pipe with Different Buried Depths","authors":"B. Lim, M. G. Kim, Kwang-Tae Kim, H. Y. Chang, Young-Sik Kim","doi":"10.14773/CST.2019.18.6.277","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.277","url":null,"abstract":"these limitations, the area potential and earth current (APEC) survey was recently proposed [25]. This method uses 3 reference electrodes. Gas pipelines were usually buried at a constant depth in the soil, but the pipelines in nuclear power plants were buried with different depth and multiple layers. Therefore, detection reliability for coating flaws in nuclear power plants was low and thus detail survey conditions are needed. As described above, three kinds of survey method have an advantage and a disadvantage. Many researchers External corrosion control of buried pipe can be achieved by the combination of barrier coating and cathodic protection. Coating damage and deterioration can be induced by many reasons; damage during handling and laying, enhanced failure at low temperatures, failure during commissioning and operation, disbanding due to inadequate surface cleaning, rock penetration during installation and service etc. This work focused on the effect of survey conditions on the reliability of coating flaw detection of buried pipes. The effects of applied voltage and anode location on the detection reliability of coating flaw of buried pipe in soil with the resistivity of ca . 25.8 k Ω ·cm were discussed. Higher applied voltage increased the detection reliability, regardless of buried depth, but deeper burial depth reduced the reliability. The location of the anode has influenced on the detection reliability. This behaviour may be induced by the variation of current distribution by the applied voltage and buried depth. From the relationship between the applied voltage and reliability, the needed detection potential to get a desire detection reliability can be calculated to get 100% detection reliability using the derived equation.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":"18 1","pages":"277-284"},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47446278","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}

引用次数: 1

Erosion Corrosion Characteristics of Al5052-O and Al6061-T6 Aluminum Alloys with Flow Rate of Seawater, 해수 유속 변화에 따른 Al5052-O와 Al6061-T6 알루미늄 합금의 침식부식 특성 Erosion Corrosion Characteristics of Al5052-O and Al6061-T6 Aluminum Alloys with Flow Rate of Seawater，Al5052-O和Al6061-T6铝合金随海水流速变化的侵蚀腐蚀特性

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Corrosion Science and Technology-Korea Pub Date : 2019-12-31 DOI: 10.14773/CST.2019.18.6.292

Young-Bok Kim, Seong-Jong Kim, 김영복, 김성종

{"title":"Erosion Corrosion Characteristics of Al5052-O and Al6061-T6 Aluminum Alloys with Flow Rate of Seawater, 해수 유속 변화에 따른 Al5052-O와 Al6061-T6 알루미늄 합금의 침식부식 특성","authors":"Young-Bok Kim, Seong-Jong Kim, 김영복, 김성종","doi":"10.14773/CST.2019.18.6.292","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.292","url":null,"abstract":"최근 조선산업의 급격한 성장으로 선박은 점차 고속, 고 출력 및 경량화로 발전하고 있으며, 이에 따라 고속 운항하 는 선박의 선체 재료는 수압, 조류, 파랑 등에 의한 유체충격 이 증가하여 침식 손상 발생이 더욱 용이해졌다. 그리고 물 리적인 침식과 더불어 강전해질인 해양환경 하에서의 전기 화학적인 부식이 복합적으로 작용하여 침식부식 (erosion corrosion) 손상이 발생하게 된다 [1-3]. 이러한 침식부식을 방지하기 위해 해양환경용 선박 재료 의 다양한 연구들이 현재까지 지속적으로 진행되고 있다. 그 일례로 Yeom 등 [1]은 인공해수에서 해양구조용 강 용 접부에 대하여 유속과 pH를 변화시켜 침식부식 시험한 결 과, 중성일 때 유속이 증가함에 따라 손상도가 증가하는 경 향을 나타냈다. 그리고 Lee 등 [2]은 Cu-Ni계 분말재를 용사피복한 강에 증류수와 해수를 혼입한 강전해질, 약전해 질의 수용액으로 일정한 유속에서 침식부식을 연구한 결과, Cu-Ni 용사피복재는 모재 대비 부식억제 효율이 약전해질 에서 96%이고, 강전해질에서 92%로 내식성이 크게 향상 된다는 사실을 규명하였다. 한편 Lim 등 [4]은 원통다관형 해수 유속 변화에 따른 Al5052-O와 Al6061-T6 알루미늄 합금의 침식부식 특성","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":"18 1","pages":"292-299"},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48890878","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}

引用次数: 2