Kaiyuan Zhai, Ling Guo, Ning Zhu, Jiayi Tang, Liusi Yu, Hu Wang, Juan Xie
The impact of temperature on CO2 corrosion were investigated by weight loss, in situ electrochemical measurements and characterization of corrosion product film. The results showed that with the increase of temperature, corrosion rate decreased remarkably, which can be ascribed to different product film formed on metal surface. As the temperature increased, the growth tendency of FeCO3 crystals on the (012) plane becomes more pronounced, ultimately forming a dense film. Synchrotron based computed laminography (SRCL) analysis proved the porosity of products decreased with the rising of temperature. The relationship between microstructure of product film and corrosion rate had also been proposed.
通过失重、原位电化学测量和腐蚀产物膜的表征，研究了温度对 CO2 腐蚀的影响。结果表明，随着温度的升高，腐蚀速率明显降低，这可归因于金属表面形成了不同的产物膜。随着温度的升高，FeCO3 晶体在 (012) 平面上的生长趋势越来越明显，最终形成了一层致密的膜。同步辐射计算机层析成像（SRCL）分析证明，产品的孔隙率随温度升高而降低。此外，还提出了产品薄膜的微观结构与腐蚀速率之间的关系。
{"title":"The Impact of Temperature on CO2 Corrosion and the Formation of Corrosion Product Film","authors":"Kaiyuan Zhai, Ling Guo, Ning Zhu, Jiayi Tang, Liusi Yu, Hu Wang, Juan Xie","doi":"10.5006/4529","DOIUrl":"https://doi.org/10.5006/4529","url":null,"abstract":"\u0000 The impact of temperature on CO2 corrosion were investigated by weight loss, in situ electrochemical measurements and characterization of corrosion product film. The results showed that with the increase of temperature, corrosion rate decreased remarkably, which can be ascribed to different product film formed on metal surface. As the temperature increased, the growth tendency of FeCO3 crystals on the (012) plane becomes more pronounced, ultimately forming a dense film. Synchrotron based computed laminography (SRCL) analysis proved the porosity of products decreased with the rising of temperature. The relationship between microstructure of product film and corrosion rate had also been proposed.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140372647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
QingLong Wu, Shangjun Gu, Jie Wang, Fulong Wei, Zhiying Li, Hui Yang, Changrong Li
In this study, a series of soaking experiments were conducted in simulated marine environment solution to explore the pitting corrosion behavior induced by four types of inclusions in micro-alloyed steel bars: Al2O3, MnS, Al2O3-(Ti,V,Nb)N and Al2O3-MnS-(Ti,V,Nb)N. In the early stage of corrosion, due to the high-density lattice distortion zone around the MnS and Al2O3 inclusions, along with the fact that these inclusions are not closely connected with the steel matrix, micro-cracks can occur leading to the initial corrosion of MnS in the Cl- environment. The corrosion rate of Al2O3 is the second highest after MnS, and clusters of Al2O3 can further accelerate the corrosion rate. The lattice distortion density around (Ti, V, Nb)N precipitates is significantly lower than that around MnS and Al2O3 inclusions. Additionally, (Ti, V, Nb)N is closely connected with the steel matrix without any micro-voids. Therefore, (Ti, V, Nb)N is not sufficient to induce pitting corrosion of the matrix. The trend of pitting corrosion induced by the four types of inclusions, Al2O3, MnS, Al2O3-(Ti,V,Nb)N, and Al2O3-MnS-(Ti,V,Nb)N, is as follows: MnS > Al2O3> Al2O3-MnS-(Ti,V,Nb)N > Al2O3-(Ti,V,Nb)N.
{"title":"Research on Pitting Corrosion of Micro-alloyed High Strength Steel Bars","authors":"QingLong Wu, Shangjun Gu, Jie Wang, Fulong Wei, Zhiying Li, Hui Yang, Changrong Li","doi":"10.5006/4479","DOIUrl":"https://doi.org/10.5006/4479","url":null,"abstract":"\u0000 In this study, a series of soaking experiments were conducted in simulated marine environment solution to explore the pitting corrosion behavior induced by four types of inclusions in micro-alloyed steel bars: Al2O3, MnS, Al2O3-(Ti,V,Nb)N and Al2O3-MnS-(Ti,V,Nb)N. In the early stage of corrosion, due to the high-density lattice distortion zone around the MnS and Al2O3 inclusions, along with the fact that these inclusions are not closely connected with the steel matrix, micro-cracks can occur leading to the initial corrosion of MnS in the Cl- environment. The corrosion rate of Al2O3 is the second highest after MnS, and clusters of Al2O3 can further accelerate the corrosion rate. The lattice distortion density around (Ti, V, Nb)N precipitates is significantly lower than that around MnS and Al2O3 inclusions. Additionally, (Ti, V, Nb)N is closely connected with the steel matrix without any micro-voids. Therefore, (Ti, V, Nb)N is not sufficient to induce pitting corrosion of the matrix. The trend of pitting corrosion induced by the four types of inclusions, Al2O3, MnS, Al2O3-(Ti,V,Nb)N, and Al2O3-MnS-(Ti,V,Nb)N, is as follows: MnS > Al2O3> Al2O3-MnS-(Ti,V,Nb)N > Al2O3-(Ti,V,Nb)N.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140223874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Oil and gas pipelines are susceptible to direct current interference from nearby third-party cathodic protection or direct current transmission systems. This paper proposes a new method for analyzing direct current interference and its mitigation measures. The proposed method is based on the boundary element method of analyzing cathodic protection systems and direct current interference. Infinity is used as the zero-potential point instead of the pipeline itself. The soil potential near the structure is divided into the cathode electric field, the anode electric field, and the electric field generated by direct current interference. The proposed method was validated to be effective for modeling these electric fields. The results indicate that interference shifts the pipeline’s body potential positively or negatively compared with that in its normal cathode state. The interference was categorized on the basis of whether it was generated by the anode or cathode electric field, and mitigation measures were designed for each type of interference through electric field cancellation.
{"title":"Modeling Direct-Current Interference on Pipelines with Zero Potential at Infinity Through Electric Field Decomposition","authors":"Liang Dong, Yan Shen, Tiansiyu Gan","doi":"10.5006/4466","DOIUrl":"https://doi.org/10.5006/4466","url":null,"abstract":"\u0000 Oil and gas pipelines are susceptible to direct current interference from nearby third-party cathodic protection or direct current transmission systems. This paper proposes a new method for analyzing direct current interference and its mitigation measures. The proposed method is based on the boundary element method of analyzing cathodic protection systems and direct current interference. Infinity is used as the zero-potential point instead of the pipeline itself. The soil potential near the structure is divided into the cathode electric field, the anode electric field, and the electric field generated by direct current interference. The proposed method was validated to be effective for modeling these electric fields. The results indicate that interference shifts the pipeline’s body potential positively or negatively compared with that in its normal cathode state. The interference was categorized on the basis of whether it was generated by the anode or cathode electric field, and mitigation measures were designed for each type of interference through electric field cancellation.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140250456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. K. Ola, Ishita Chopra, S. Gopalakrishnan, Veena Dhayal
In this work, acetoxime, zinc chloride and acetoxime adduct of zinc chloride, [ZnCl2.2{HON=C(CH3)2}] (ZA) were investigated as corrosion inhibitor's in 3.5%NaCl solution on mild steel. The electrochemical analysis was carried out using polarization measurements and electrochemical impedance technique and surface analysis was done by Scanning electron microscope coupled with Energy-dispersive X-ray spectroscopy. Using surface analysis and electrochemical data it was concluded that an inhibition synergy was developed when ZA was taken instead of acetoxime or zinc chloride alone in solution phase. Scanning electron microscope methods were used to examine the samples surface in the presence of inhibited solutions. The efficiency of inhibition increases with the increasing concentration and attained the values of 97.18% for the 3mM concentration of ZA.
{"title":"“Exploring the Inhibitory Potential of Acetoxime-Zinc Chloride Adduct in Saline Environments for Mild Steel Corrosion Protection”","authors":"S. K. Ola, Ishita Chopra, S. Gopalakrishnan, Veena Dhayal","doi":"10.5006/4398","DOIUrl":"https://doi.org/10.5006/4398","url":null,"abstract":"\u0000 In this work, acetoxime, zinc chloride and acetoxime adduct of zinc chloride, [ZnCl2.2{HON=C(CH3)2}] (ZA) were investigated as corrosion inhibitor's in 3.5%NaCl solution on mild steel. The electrochemical analysis was carried out using polarization measurements and electrochemical impedance technique and surface analysis was done by Scanning electron microscope coupled with Energy-dispersive X-ray spectroscopy. Using surface analysis and electrochemical data it was concluded that an inhibition synergy was developed when ZA was taken instead of acetoxime or zinc chloride alone in solution phase. Scanning electron microscope methods were used to examine the samples surface in the presence of inhibited solutions. The efficiency of inhibition increases with the increasing concentration and attained the values of 97.18% for the 3mM concentration of ZA.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140250894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The corrosion behavior of 3Cr steel and HP-13Cr stainless steel (SS) under high temperature and CO2 or H2S pressure environments was investigated by immersion tests and multiple characterizations of corrosion films, and analyzed by combining the Pourbaix diagram and kinetic calculations. At 180 °C/3.8 MPa CO2, both 3Cr steel and HP-13Cr SS exhibited double-layered corrosion films, comprising a crystalline FeCO3 outer layer and an inner Cr2O3 and Cr(OH)3 layer. Furthermore, at 180 °C/3.8 MPa H2S, the corrosion films of both steels consist of an outer crystalline pyrrhotite and pyrite layer and an inner Cr2O3 and Cr(OH)3 layer. The corrosion resistance of 3Cr in H2S is inferior to that of HP-13Cr SS due to the influence of stress corrosion cracking but is close to that of HP-13Cr SS in CO2. Therefore, 3Cr steel could be considered a cost-effective alternative to HP-13Cr SS in CO2 environments.
通过浸泡试验和腐蚀膜的多重表征，研究了 3Cr 钢和 HP-13Cr 不锈钢（SS）在高温和 CO2 或 H2S 压力环境下的腐蚀行为，并结合 Pourbaix 图和动力学计算进行了分析。在 180 °C/3.8 MPa CO2 条件下，3Cr 钢和 HP-13Cr SS 都表现出双层腐蚀膜，包括外层结晶的 FeCO3 和内层的 Cr2O3 和 Cr(OH)3。此外，在 180 °C/3.8 MPa H2S 条件下，两种钢的腐蚀膜都由外层结晶黄铁矿和黄铁矿层和内层 Cr2O3 和 Cr(OH)3 层组成。由于应力腐蚀开裂的影响，3Cr 在 H2S 中的耐腐蚀性不如 HP-13Cr SS，但与 HP-13Cr SS 在 CO2 中的耐腐蚀性接近。因此，在 CO2 环境中，3Cr 钢可被视为 HP-13Cr SS 的一种经济有效的替代品。
{"title":"Combining Thermodynamics and Kinetics to Investigate the Corrosion of 3Cr Steel and HP-13Cr Stainless Steel in Extreme Oil-Gas Environments","authors":"Hao Xue, Yang Zhao, Tao Zhang, Fuhui Wang","doi":"10.5006/4490","DOIUrl":"https://doi.org/10.5006/4490","url":null,"abstract":"\u0000 The corrosion behavior of 3Cr steel and HP-13Cr stainless steel (SS) under high temperature and CO2 or H2S pressure environments was investigated by immersion tests and multiple characterizations of corrosion films, and analyzed by combining the Pourbaix diagram and kinetic calculations. At 180 °C/3.8 MPa CO2, both 3Cr steel and HP-13Cr SS exhibited double-layered corrosion films, comprising a crystalline FeCO3 outer layer and an inner Cr2O3 and Cr(OH)3 layer. Furthermore, at 180 °C/3.8 MPa H2S, the corrosion films of both steels consist of an outer crystalline pyrrhotite and pyrite layer and an inner Cr2O3 and Cr(OH)3 layer. The corrosion resistance of 3Cr in H2S is inferior to that of HP-13Cr SS due to the influence of stress corrosion cracking but is close to that of HP-13Cr SS in CO2. Therefore, 3Cr steel could be considered a cost-effective alternative to HP-13Cr SS in CO2 environments.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140248722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Luntao Wang, Huiru Wang, N. Moradighadi, A. Seyeux, Alain Pailleret, S. Nešić, Philippe Marcus
ToF-SIMS 3D mapping and depth profiling were used to study the anodic iron dissolution mechanisms of mild steel in chloride containing aqueous CO2 environments. The technique detected adsorbed hydroxide and chloride intermediates formed duringthe corrosion process, which is consistent with the proposed multi-path reaction mechanism for anodic iron dissolution reaction. Despite the presence of aqueous carbonic species and their observed effect on the kinetics of iron dissolution, no additional adsorbed intermediates have been detected in aqueous CO2 environments, indicating that carbonic species do not directly participate in the iron dissolution reaction. ToF-SIMS 3D mapping results on characterization of the specimens immersed in a chloride containing solution with and without CO2 suggest that one role of aqueous carbonic species CO2 could be to accelerate the adsorption of chloride ions and formation of chloride intermediates.
利用 ToF-SIMS 三维绘图和深度剖析技术研究了低碳钢在含有氯化物的二氧化碳水环境中的阳极溶铁机理。该技术检测到了腐蚀过程中形成的吸附氢氧化物和氯化物中间产物，这与所提出的阳极铁溶解反应的多路径反应机制相一致。尽管存在水溶液中的碳酸物种并观察到其对铁溶解动力学的影响，但在二氧化碳水溶液环境中没有检测到额外的吸附中间产物，这表明碳酸物种并不直接参与铁溶解反应。对浸入含氯化物溶液（含二氧化碳和不含二氧化碳）中的试样进行表征的 ToF-SIMS 3D 绘图结果表明，水溶液中碳酸物种二氧化碳的一个作用可能是加速氯离子的吸附和氯化物中间产物的形成。
{"title":"Investigation of iron dissolution mechanism in acidic solutions with and without dissolved CO2 – Part II: ToF-SIMS 3D mapping","authors":"Luntao Wang, Huiru Wang, N. Moradighadi, A. Seyeux, Alain Pailleret, S. Nešić, Philippe Marcus","doi":"10.5006/4512","DOIUrl":"https://doi.org/10.5006/4512","url":null,"abstract":"\u0000 ToF-SIMS 3D mapping and depth profiling were used to study the anodic iron dissolution mechanisms of mild steel in chloride containing aqueous CO2 environments. The technique detected adsorbed hydroxide and chloride intermediates formed duringthe corrosion process, which is consistent with the proposed multi-path reaction mechanism for anodic iron dissolution reaction. Despite the presence of aqueous carbonic species and their observed effect on the kinetics of iron dissolution, no additional adsorbed intermediates have been detected in aqueous CO2 environments, indicating that carbonic species do not directly participate in the iron dissolution reaction. ToF-SIMS 3D mapping results on characterization of the specimens immersed in a chloride containing solution with and without CO2 suggest that one role of aqueous carbonic species CO2 could be to accelerate the adsorption of chloride ions and formation of chloride intermediates.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140423020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Woo-Hyuk Lee, Geon-il Kim, Myeong-Cheol Kim, S. Ko, Yoon-Ho Lee, Ju-Seung Song, Jung-Gu Kim
This study investigated the corrosion behavior of ADC12 and A365 aluminum alloys for automotive parts in the context of the growing use of aluminum parts in electric vehicles. Only ADC12 exhibited the formation of Al(OH)3 particle layer after corrosion, which was attributed to the micro-galvanic effect influenced by the geometry characteristics of its microstructure. Results revealed that ADC12 was prone to the formation of Al(OH)3 particle layers due to the geometric effects of Si and θ-Al2Cu, which facilitates the isolation of α-Al. The distribution of band-shaped galvanic currents, concentrated in a small α-Al matrix region, was primarily governed by the geometry of Si, creating a preferred structure for α-Al isolation. Additionally, the geometry of θ-Al2Cu contributed to a significant increase in electrochemical kinetics, particularly at the tri-metallic coupled region, further enhancing the susceptibility of the isolation. As a result, the formation of the Al(OH)3 particle layer was attributed to the corrosion of isolated α-Al particles, generated through the synergistic effect of micro-galvanic corrosion. Moreover, the corrosion attack progressed along the eutectic Si network, accompanied by θ-Al2Cu. Overall, the corrosion mechanism of ADC12 and A365 alloy was proposed.
{"title":"Effect of Tri-Metallic Micro-galvanic Corrosion on Localized Corrosion Based on Numerical Simulation: Geometric Effect of Intermetallic Compounds","authors":"Woo-Hyuk Lee, Geon-il Kim, Myeong-Cheol Kim, S. Ko, Yoon-Ho Lee, Ju-Seung Song, Jung-Gu Kim","doi":"10.5006/4377","DOIUrl":"https://doi.org/10.5006/4377","url":null,"abstract":"\u0000 This study investigated the corrosion behavior of ADC12 and A365 aluminum alloys for automotive parts in the context of the growing use of aluminum parts in electric vehicles. Only ADC12 exhibited the formation of Al(OH)3 particle layer after corrosion, which was attributed to the micro-galvanic effect influenced by the geometry characteristics of its microstructure. Results revealed that ADC12 was prone to the formation of Al(OH)3 particle layers due to the geometric effects of Si and θ-Al2Cu, which facilitates the isolation of α-Al. The distribution of band-shaped galvanic currents, concentrated in a small α-Al matrix region, was primarily governed by the geometry of Si, creating a preferred structure for α-Al isolation. Additionally, the geometry of θ-Al2Cu contributed to a significant increase in electrochemical kinetics, particularly at the tri-metallic coupled region, further enhancing the susceptibility of the isolation. As a result, the formation of the Al(OH)3 particle layer was attributed to the corrosion of isolated α-Al particles, generated through the synergistic effect of micro-galvanic corrosion. Moreover, the corrosion attack progressed along the eutectic Si network, accompanied by θ-Al2Cu. Overall, the corrosion mechanism of ADC12 and A365 alloy was proposed.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140420571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Accurate measurements of corrosion potential are important for assessing the likelihood of internal localized corrosion and stress corrosion cracking (SCC) of carbon steel tanks used for storing radioactive wastes. Reference electrodes in underground radioactive waste storage tanks are challenging to deploy, and more difficult to extract and replace frequently due to radiological exposure and disposal constraints. Hence, electrodes that exhibit stable performance over long periods of immersion in these waste environments are desirable. The present study evaluates the stability of reference electrodes used in radioactive waste storage tanks over a much longer period than previously studied. Long-term tests of Ag/AgCl and Hg/HgO reference electrodes were performed in nonradioactive simulants formulated from wastes stored at the Hanford site. Electrode degradation, which was studied by a variety of in-situ and ex-situ evaluation techniques, was correlated to changes in electrode fill chemistry from waste intrusion via the porous frit junction. An intentional contamination study was performed to better understand and predict contamination effects on electrode potential drift.
{"title":"Long-Term Performance of Reference Electrodes in Alkaline Radioactive Waste Storage Environments","authors":"S. Chawla, Kenneth Evans, Sheewa Feng, N. Sridhar","doi":"10.5006/4520","DOIUrl":"https://doi.org/10.5006/4520","url":null,"abstract":"\u0000 Accurate measurements of corrosion potential are important for assessing the likelihood of internal localized corrosion and stress corrosion cracking (SCC) of carbon steel tanks used for storing radioactive wastes. Reference electrodes in underground radioactive waste storage tanks are challenging to deploy, and more difficult to extract and replace frequently due to radiological exposure and disposal constraints. Hence, electrodes that exhibit stable performance over long periods of immersion in these waste environments are desirable. The present study evaluates the stability of reference electrodes used in radioactive waste storage tanks over a much longer period than previously studied. Long-term tests of Ag/AgCl and Hg/HgO reference electrodes were performed in nonradioactive simulants formulated from wastes stored at the Hanford site. Electrode degradation, which was studied by a variety of in-situ and ex-situ evaluation techniques, was correlated to changes in electrode fill chemistry from waste intrusion via the porous frit junction. An intentional contamination study was performed to better understand and predict contamination effects on electrode potential drift.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140423237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wei Zhang, Mingyang Zhou, Yuanjie Fu, Xi Qiu, Jijun Yang
FeCrAlY coatings deposited on the outer surface of the cladding tube by the magnetron sputtering with varying bias voltages (0 V to -500 V) were corroded at 550 – 600 °C in oxygen-saturated and oxygen-poor LBE for 500 – 1000 h. The increased bias voltage led to the Al content decreased and the Y content increased. The coating changed from columnar crystals to equiaxed crystals with the increase of bias voltage. The decreased bias voltage makes an improved corrosion resistance. The fundamental process governing the evolution of microstructure and corrosion resistance in the FeCrAlY coatings was discussed.
通过磁控溅射法在不同偏置电压（0 V 至 -500 V）下沉积在包壳管外表面的铁铬铝铍镀层在氧气饱和和氧气贫乏的 LBE 中于 550 - 600 °C 下腐蚀了 500 - 1000 h。随着偏压的增加，涂层从柱状晶变成了等轴晶。偏压的降低使耐腐蚀性得到改善。讨论了支配 FeCrAlY 涂层微观结构和耐腐蚀性演变的基本过程。
{"title":"Effect of bias voltage on the microstructure and LBE corrosion resistance of the FeCrAlY coating","authors":"Wei Zhang, Mingyang Zhou, Yuanjie Fu, Xi Qiu, Jijun Yang","doi":"10.5006/4509","DOIUrl":"https://doi.org/10.5006/4509","url":null,"abstract":"\u0000 FeCrAlY coatings deposited on the outer surface of the cladding tube by the magnetron sputtering with varying bias voltages (0 V to -500 V) were corroded at 550 – 600 °C in oxygen-saturated and oxygen-poor LBE for 500 – 1000 h. The increased bias voltage led to the Al content decreased and the Y content increased. The coating changed from columnar crystals to equiaxed crystals with the increase of bias voltage. The decreased bias voltage makes an improved corrosion resistance. The fundamental process governing the evolution of microstructure and corrosion resistance in the FeCrAlY coatings was discussed.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140439342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Houwei Zhang, Qing Zheng, Dengyun Wang, Ming Liu, Gang Li, Lining Xu, Lijie Qiao
This study simulates the behavior of 2205 duplex stainless steel in an actual service environment under hydrogen charging/releasing cycles. Electrochemical and immersion experiments are conducted to compare the pitting susceptibility and corrosion behavior of 2205 DSS under single hydrogen charging and several hydrogen charging/releasing cycles. The results reveal that under single hydrogen charging, pits preferentially initiate and propagate within the austenite phase; this finding is consistent with the results of previous studies. However, under cyclic hydrogen charging/releasing cycles, pits initiate at the phase boundary and propagate along it. Moreover, a hydrogen microprint technique is used to characterize the hydrogen enrichment sites in 2205 duplex stainless steel. The results demonstrate that pits preferentially initiate at the same hydrogen enrichment sites. The study creates a schematic of hydrogen redistribution and hypothesizes that under actual service conditions, the phase boundary, rather than the austenite phase, is the primary site for pitting corrosion because of its transformation into a hydrogen enrichment site from a hydrogen trap.
{"title":"Influence of the interaction of hydrogen with the phase boundary of duplex stainless steel on corrosion","authors":"Houwei Zhang, Qing Zheng, Dengyun Wang, Ming Liu, Gang Li, Lining Xu, Lijie Qiao","doi":"10.5006/4519","DOIUrl":"https://doi.org/10.5006/4519","url":null,"abstract":"\u0000 This study simulates the behavior of 2205 duplex stainless steel in an actual service environment under hydrogen charging/releasing cycles. Electrochemical and immersion experiments are conducted to compare the pitting susceptibility and corrosion behavior of 2205 DSS under single hydrogen charging and several hydrogen charging/releasing cycles. The results reveal that under single hydrogen charging, pits preferentially initiate and propagate within the austenite phase; this finding is consistent with the results of previous studies. However, under cyclic hydrogen charging/releasing cycles, pits initiate at the phase boundary and propagate along it. Moreover, a hydrogen microprint technique is used to characterize the hydrogen enrichment sites in 2205 duplex stainless steel. The results demonstrate that pits preferentially initiate at the same hydrogen enrichment sites. The study creates a schematic of hydrogen redistribution and hypothesizes that under actual service conditions, the phase boundary, rather than the austenite phase, is the primary site for pitting corrosion because of its transformation into a hydrogen enrichment site from a hydrogen trap.","PeriodicalId":10717,"journal":{"name":"Corrosion","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140440419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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