Pub Date : 2019-12-31DOI: 10.14773/CST.2019.18.6.243
Y. Shin, Kyehyun Cho
{"title":"Corrosion Behavior and Inhibition Studies of AZ31B Magnesium Alloy With and Without Cl- in the Alkaline Electrolytes in Addition with Various Inhibitor Additives","authors":"Y. Shin, Kyehyun Cho","doi":"10.14773/CST.2019.18.6.243","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.243","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48358826","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 : 2019-12-31DOI: 10.14773/CST.2019.18.6.267
Jin-seong Park, H. Seong, S. Kim
of them focused on the mechanical degradation of pre-charged steel under electrochemical cathodic polarization, and the corrosion behaviors on the steel surface were not considered. In particular, there have been a limited number of studies on the ef-fects of microstructural modifications by heat treatment on the corrosion and HE of ultra-strong automotive steel. Therefore, this study examined the corrosion-induced HE of ultra-strong steel samples prepared under different heat treatment conditions, and the controlling factors for corro-Effect The purpose of this study was to examine the influence of conditions for quenching and/or tempering on the corrosion and hydrogen diffusion behavior of ultra-strong automotive steel in terms of the localized plastic strain related to the dislocation density, and the precipitation of iron carbide. In this study, a range of analytical and experimental methods were deployed, such as field emission-scanning electron microscopy, electron back scatter diffraction, electrochemical permeation technique, slow-strain rate test (SSRT), and electrochemical polarization test. The results showed that the hydrogen diffusion parameters involving the diffusion kinetics and hydrogen solubility, obtained from the permeation experiment, could not be directly indicative of the resistance to hydrogen embrittlement (HE) occurring under the condition with low hydrogen concentration. The SSRT results showed that the partitioning process, leading to decrease in localized plastic strain and dislocation density in the sample, results in a high resistance to HE-induced by aqueous corrosion. Conversely, coarse iron carbide, precipitated during heat treatment, weakened the long-term corrosion resistance. This can also be a controlling factor for the development of ultra-strong steel with superior corrosion and HE resistance.
{"title":"Effect of Heat Treatment Conditions on Corrosion and Hydrogen Diffusion Behaviors of Ultra-Strong Steel Used for Automotive Applications","authors":"Jin-seong Park, H. Seong, S. Kim","doi":"10.14773/CST.2019.18.6.267","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.267","url":null,"abstract":"of them focused on the mechanical degradation of pre-charged steel under electrochemical cathodic polarization, and the corrosion behaviors on the steel surface were not considered. In particular, there have been a limited number of studies on the ef-fects of microstructural modifications by heat treatment on the corrosion and HE of ultra-strong automotive steel. Therefore, this study examined the corrosion-induced HE of ultra-strong steel samples prepared under different heat treatment conditions, and the controlling factors for corro-Effect The purpose of this study was to examine the influence of conditions for quenching and/or tempering on the corrosion and hydrogen diffusion behavior of ultra-strong automotive steel in terms of the localized plastic strain related to the dislocation density, and the precipitation of iron carbide. In this study, a range of analytical and experimental methods were deployed, such as field emission-scanning electron microscopy, electron back scatter diffraction, electrochemical permeation technique, slow-strain rate test (SSRT), and electrochemical polarization test. The results showed that the hydrogen diffusion parameters involving the diffusion kinetics and hydrogen solubility, obtained from the permeation experiment, could not be directly indicative of the resistance to hydrogen embrittlement (HE) occurring under the condition with low hydrogen concentration. The SSRT results showed that the partitioning process, leading to decrease in localized plastic strain and dislocation density in the sample, results in a high resistance to HE-induced by aqueous corrosion. Conversely, coarse iron carbide, precipitated during heat treatment, weakened the long-term corrosion resistance. This can also be a controlling factor for the development of ultra-strong steel with superior corrosion and HE resistance.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47563128","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 : 2019-12-31DOI: 10.14773/CST.2019.18.6.228
Hyejeong Ji, Chanyoung Jeong
{"title":"Fabrication of Superhydrophobic Aluminum Alloy Surface with Hierarchical Pore Nanostructure for Anti-Corrosion","authors":"Hyejeong Ji, Chanyoung Jeong","doi":"10.14773/CST.2019.18.6.228","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.228","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43393390","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 : 2019-12-31DOI: 10.14773/CST.2019.18.6.232
N. Lee, Y. H. Kim, T. Im, D. U. Lee, MinYoung Shon, M. Moon
{"title":"Analysis of PVDF Coating Properties with Addition of Hydrophobically Modified Fumed Silica","authors":"N. Lee, Y. H. Kim, T. Im, D. U. Lee, MinYoung Shon, M. Moon","doi":"10.14773/CST.2019.18.6.232","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.232","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42072829","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 : 2019-12-31DOI: 10.14773/CST.2019.18.6.258
G. Jung, Yong-ha Park, Dae-Jung Kim, C. Lim
Additive manufacturing (AM), also known as 3D printing, is relatively new technology as a manufacturing method for metallic materials compared to conventional manufacturing techniques such as casting and metal working. The products from AM are made stacking metallic materials in a layer by layer fashion according to CAD-drawn 3D models. The technique allows immense freedom in a dimension of the produced parts, enabling fabrication of complex-shaped parts that are very difficult or sometimes impossible to be realized otherwise. This is beneficial in multiple ways. A total weight of AM parts and manufacturing process time can be hugely saved. The part that is originally made by joining of smaller parts can be made in a single piece, improving productivity and also eliminating joint problems. Due to the reasons described, additive manufacturing has been popular in many industrial and military fields of application for past decades [1,2,3]. However, it is not until recently that the technology starts to gain attention from the marine and shipbuilding industry. The effort to utilize the advantages of AM in the maritime sector has been made collaboratively by major shipyards and governmental bodies [4] for the special purpose parts. Classification societies are also making involvements in this current trend. However, it is not completely certain whether the 3D printed metallic parts can meet high expectations of the shipbuilding industries. In most cases, metallic parts for marine purposes are a subject of many demands, e.g., structural load carrying capabilities, anti-corrosion properties and other functional purposes. In this work, 3D printed 316L stainless steel and alloy 625, actively used corrosion resistance alloys (CRA) in shipbuilding, are evaluated to study on their corrosion resistance in seawater, as seawater is a very important liquid actively utilized by the ship for ballasting, firefighting, and many other utility purposes. Due to the presence of chloride ions in seawater, the liquid tends to offer very harsh conditions to many metals.
{"title":"Study on Corrosion Properties of Additive Manufactured 316L Stainless Steel and Alloy 625 in Seawater","authors":"G. Jung, Yong-ha Park, Dae-Jung Kim, C. Lim","doi":"10.14773/CST.2019.18.6.258","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.258","url":null,"abstract":"Additive manufacturing (AM), also known as 3D printing, is relatively new technology as a manufacturing method for metallic materials compared to conventional manufacturing techniques such as casting and metal working. The products from AM are made stacking metallic materials in a layer by layer fashion according to CAD-drawn 3D models. The technique allows immense freedom in a dimension of the produced parts, enabling fabrication of complex-shaped parts that are very difficult or sometimes impossible to be realized otherwise. This is beneficial in multiple ways. A total weight of AM parts and manufacturing process time can be hugely saved. The part that is originally made by joining of smaller parts can be made in a single piece, improving productivity and also eliminating joint problems. Due to the reasons described, additive manufacturing has been popular in many industrial and military fields of application for past decades [1,2,3]. However, it is not until recently that the technology starts to gain attention from the marine and shipbuilding industry. The effort to utilize the advantages of AM in the maritime sector has been made collaboratively by major shipyards and governmental bodies [4] for the special purpose parts. Classification societies are also making involvements in this current trend. However, it is not completely certain whether the 3D printed metallic parts can meet high expectations of the shipbuilding industries. In most cases, metallic parts for marine purposes are a subject of many demands, e.g., structural load carrying capabilities, anti-corrosion properties and other functional purposes. In this work, 3D printed 316L stainless steel and alloy 625, actively used corrosion resistance alloys (CRA) in shipbuilding, are evaluated to study on their corrosion resistance in seawater, as seawater is a very important liquid actively utilized by the ship for ballasting, firefighting, and many other utility purposes. Due to the presence of chloride ions in seawater, the liquid tends to offer very harsh conditions to many metals.","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48205995","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 : 2019-12-31DOI: 10.14773/CST.2019.18.6.300
S. Kim, Joong-ki Hwang, Sung Jin Kim, 김시온, 황중기, 김성진
{"title":"Effect of Alloying Elements (Cu, Al, Si) on the Electrochemical Corrosion Behaviors of TWIP Steel in a 3.5 % NaCl Solution, 3.5% NaCl 수용액 내 TWIP강의 부식거동에 미치는 합금원소 (Cu, Al, Si)의 영향","authors":"S. Kim, Joong-ki Hwang, Sung Jin Kim, 김시온, 황중기, 김성진","doi":"10.14773/CST.2019.18.6.300","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.300","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42238767","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 : 2019-12-31DOI: 10.14773/CST.2019.18.6.221
P. Rajala, M. Raulio, L. Carpén
{"title":"Sulphate Reducing Bacteria and Methanogenic Archaea Driving Corrosion of Steel in Deep Anoxic Ground Water","authors":"P. Rajala, M. Raulio, L. Carpén","doi":"10.14773/CST.2019.18.6.221","DOIUrl":"https://doi.org/10.14773/CST.2019.18.6.221","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41817153","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 : 2019-10-31DOI: 10.14773/CST.2019.18.5.196
Ki Tae Kim, Y. Kim
The application of surface modification technology, including water jet and laser peening, was carried out in the early 2000s in many industries [1,2].The nuclear industry has tried to apply this technology to the parts of the primary and secondary sides because the technology can harden the surface and improve the fatigue strength, surface roughness and wear resistance, and form very high compressive stresses on the surface [3-7]. When SCC (Stress Corrosion Cracking) susceptible materials were used in corrosive environments under high tensile stress fields, generally, SCC could be easily induced [8]. Therefore, nuclear power plants are trying to apply various methods, including the substitution to high corrosion resistant materials, reduction of mechanical stress, weld overlay, weld inlay, weld onlay and water chemistry control [1]. However, the above methods have a difficulty because of high cost. As a result, the peening process is emerging in order to reduce the difficulty of the substitution and inspection costs. Since 2016, the nuclear industry in the USA has applied the peening process to nuclear vessels and steam generator, and tried its application to other parts and further research [1]. Applicable peening process includes shot [9-11], laser [12-16], water jet [17,18] and ultrasonic shot peening [19,20], and UNSM etc. Among the peening processes, it is well known that UNSM is very powerful [21]. In the UNSM process, the material is impacted with a hard rigid pin moving at a ultrasonic frequency, typically 20 kHz. A tungsten carbide (WC) tip is attached to an ultrasonic horn, which strikes the specimen surface up to 20,000 or more times per second with 1,000 to 10,000 shots per square millimeter in a very short time. The impact deforms the surface of the target material and converts its microstructure into nanocrystals [22]. The variables in the UNSM process are static load, amplitude, pitch and tip diameter, etc. Researches about mechanical properties and fatigue were performed by using the UNSM technology [23-26], but there is little to the study about the corrosion resistance. Recently, our research team reported the effect of UNSM on the corrosion resistance of stainless steel and Alloy 600. In the case of the stainless steel [27-29], the UNSM treatment improves the passivation film and pitting corrosion resistance, and reduces the chromium carbide Effect of the Amplitude in Ultrasonic Nano-crystalline Surface Modification on the Corrosion Properties of Alloy 600
{"title":"Effect of the Amplitude in Ultrasonic Nano-crystalline Surface Modification on the Corrosion Properties of Alloy 600","authors":"Ki Tae Kim, Y. Kim","doi":"10.14773/CST.2019.18.5.196","DOIUrl":"https://doi.org/10.14773/CST.2019.18.5.196","url":null,"abstract":"The application of surface modification technology, including water jet and laser peening, was carried out in the early 2000s in many industries [1,2].The nuclear industry has tried to apply this technology to the parts of the primary and secondary sides because the technology can harden the surface and improve the fatigue strength, surface roughness and wear resistance, and form very high compressive stresses on the surface [3-7]. When SCC (Stress Corrosion Cracking) susceptible materials were used in corrosive environments under high tensile stress fields, generally, SCC could be easily induced [8]. Therefore, nuclear power plants are trying to apply various methods, including the substitution to high corrosion resistant materials, reduction of mechanical stress, weld overlay, weld inlay, weld onlay and water chemistry control [1]. However, the above methods have a difficulty because of high cost. As a result, the peening process is emerging in order to reduce the difficulty of the substitution and inspection costs. Since 2016, the nuclear industry in the USA has applied the peening process to nuclear vessels and steam generator, and tried its application to other parts and further research [1]. Applicable peening process includes shot [9-11], laser [12-16], water jet [17,18] and ultrasonic shot peening [19,20], and UNSM etc. Among the peening processes, it is well known that UNSM is very powerful [21]. In the UNSM process, the material is impacted with a hard rigid pin moving at a ultrasonic frequency, typically 20 kHz. A tungsten carbide (WC) tip is attached to an ultrasonic horn, which strikes the specimen surface up to 20,000 or more times per second with 1,000 to 10,000 shots per square millimeter in a very short time. The impact deforms the surface of the target material and converts its microstructure into nanocrystals [22]. The variables in the UNSM process are static load, amplitude, pitch and tip diameter, etc. Researches about mechanical properties and fatigue were performed by using the UNSM technology [23-26], but there is little to the study about the corrosion resistance. Recently, our research team reported the effect of UNSM on the corrosion resistance of stainless steel and Alloy 600. In the case of the stainless steel [27-29], the UNSM treatment improves the passivation film and pitting corrosion resistance, and reduces the chromium carbide Effect of the Amplitude in Ultrasonic Nano-crystalline Surface Modification on the Corrosion Properties of Alloy 600","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45219288","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 : 2019-10-31DOI: 10.14773/CST.2019.18.5.175
Y. Jung, S. Baik
{"title":"Investigation of Pellet-Clad Mechanical Interaction in Failed Spent PWR Fuel","authors":"Y. Jung, S. Baik","doi":"10.14773/CST.2019.18.5.175","DOIUrl":"https://doi.org/10.14773/CST.2019.18.5.175","url":null,"abstract":"","PeriodicalId":43201,"journal":{"name":"Corrosion Science and Technology-Korea","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42865807","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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