The corrosion of carbon steels, including AISI 1018, API 5L Grade X65, and API 5CT P110, in aqueous drilling fluids was examined at 70 °C under both aerobic and anaerobic conditions. The corrosion behavior of these steels in aqueous drilling fluids is fundamentally different from that in brine (3 wt% NaCl) solutions due to the formation of a zero-valent copper-enriched film, which accelerates corrosion through galvanic mechanisms. The mechanism of copper film formation is proposed, and the key roles of metal composition, flow conditions, clay and barite microparticles, polymeric viscosifier, and oxygen scavengers in the reduction of Cu2+ at the steel electrode are identified.
{"title":"Formation of zero-valent copper film during corrosion of carbon steel in aqueous drilling fluids","authors":"Evgeny Barmatov, Isabelle Atheaux, Anatoly Medvedev","doi":"10.1016/j.corsci.2025.112754","DOIUrl":"10.1016/j.corsci.2025.112754","url":null,"abstract":"<div><div>The corrosion of carbon steels, including AISI 1018, API 5L Grade X65, and API 5CT P110, in aqueous drilling fluids was examined at 70 °C under both aerobic and anaerobic conditions. The corrosion behavior of these steels in aqueous drilling fluids is fundamentally different from that in brine (3 wt% NaCl) solutions due to the formation of a zero-valent copper-enriched film, which accelerates corrosion through galvanic mechanisms. The mechanism of copper film formation is proposed, and the key roles of metal composition, flow conditions, clay and barite microparticles, polymeric viscosifier, and oxygen scavengers in the reduction of Cu<sup>2+</sup> at the steel electrode are identified.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112754"},"PeriodicalIF":7.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-29DOI: 10.1016/j.corsci.2025.112752
Baoquan Xue , Jibo Tan , Xinqiang Wu , Ziyu Zhang , Wei Ke
316LN austenite stainless steel (AuSS) is a candidate structural material for the reactor vessel in lead-bismuth eutectic (LBE) cooled fast reactor. However, the potential risks of liquid metal embrittlement (LME) and the associated damage mechanisms for 316LN AuSS in LBE remain poorly understood. In this study, the micro-mechanisms of fatigue crack growth (FCG) of 316LN AuSS in oxygen-saturated liquid LBE at 200–400 °C were investigated by multiscale advanced characterization techniques. The FCG rate increased significantly when the LBE temperature exceeded 300 °C and the stress intensity range (ΔK) surpassed approximately 20 MPa·m0.5. Initially, 316 LN AuSS exhibited ductile cracking, which subsequently transitioned to quasi-cleavage and ultimately to cleavage cracking. As the crack propagated, the interaction between plastic deformation and liquid LBE wetting induced the evolution of the microstructures ahead of the crack tip, accompanied by an increase in LME sensitivity. The crack preferentially propagated along the deformation-induced microstructural interfaces, including twin boundaries and planar dislocation bands at cleavage crack tip. Liquid Pb-Bi atoms preferentially segregated at these microstructural interfaces, promoting brittle cracking. Even trace amounts of Pb atoms doped on the high-density dislocation walls can promote the interfacial cleavage cracking under conditions of high stress concentration ahead of the sharpened crack tip.
{"title":"Unveiling liquid Pb-Bi embrittlement of 316LN stainless steel under fatigue crack propagation tests through multiscale advanced characterization","authors":"Baoquan Xue , Jibo Tan , Xinqiang Wu , Ziyu Zhang , Wei Ke","doi":"10.1016/j.corsci.2025.112752","DOIUrl":"10.1016/j.corsci.2025.112752","url":null,"abstract":"<div><div>316LN austenite stainless steel (AuSS) is a candidate structural material for the reactor vessel in lead-bismuth eutectic (LBE) cooled fast reactor. However, the potential risks of liquid metal embrittlement (LME) and the associated damage mechanisms for 316LN AuSS in LBE remain poorly understood. In this study, the micro-mechanisms of fatigue crack growth (FCG) of 316LN AuSS in oxygen-saturated liquid LBE at 200–400 °C were investigated by multiscale advanced characterization techniques. The FCG rate increased significantly when the LBE temperature exceeded 300 °C and the stress intensity range (ΔK) surpassed approximately 20 MPa·m<sup>0.5</sup>. Initially, 316 LN AuSS exhibited ductile cracking, which subsequently transitioned to quasi-cleavage and ultimately to cleavage cracking. As the crack propagated, the interaction between plastic deformation and liquid LBE wetting induced the evolution of the microstructures ahead of the crack tip, accompanied by an increase in LME sensitivity. The crack preferentially propagated along the deformation-induced microstructural interfaces, including twin boundaries and planar dislocation bands at cleavage crack tip. Liquid Pb-Bi atoms preferentially segregated at these microstructural interfaces, promoting brittle cracking. Even trace amounts of Pb atoms doped on the high-density dislocation walls can promote the interfacial cleavage cracking under conditions of high stress concentration ahead of the sharpened crack tip.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112752"},"PeriodicalIF":7.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-29DOI: 10.1016/j.corsci.2025.112753
Jianhua Chu, Ziyi Cheng, Panjun Dou, Xi Pan, Ziming Wang, Yutong Li, Na Tao, Qiang Yue, Lizhong Chang
The corrosion behaviour of MgO-C refractories by high manganese steel melt was investigated. The results demonstrated that corrosion mechanism of MgO-C refractories by manganese steel with a manganese content of less than 20 % is mainly decarburization reaction, while the corrosion for manganese content of 30 % is mainly reduction reaction of MgO by C and [Mn] as well as the penetration of Fe-Mn-Si melt, and the number of the MgO-rich inclusions significantly increase. The aluminium addition promotes the decarburization reaction, and the [Al] react with MgO directly to form Al2O3, follow by MgO·Al2O3 was generated at around the periclase in MgO-C refractories, and the inclusions mainly transform from TiN-AlN to TiN-MgO-AlN with MgO core.
{"title":"Corrosion behaviour of magnesia-carbon refractories by high manganese steel melts","authors":"Jianhua Chu, Ziyi Cheng, Panjun Dou, Xi Pan, Ziming Wang, Yutong Li, Na Tao, Qiang Yue, Lizhong Chang","doi":"10.1016/j.corsci.2025.112753","DOIUrl":"10.1016/j.corsci.2025.112753","url":null,"abstract":"<div><div>The corrosion behaviour of MgO-C refractories by high manganese steel melt was investigated. The results demonstrated that corrosion mechanism of MgO-C refractories by manganese steel with a manganese content of less than 20 % is mainly decarburization reaction, while the corrosion for manganese content of 30 % is mainly reduction reaction of MgO by C and [Mn] as well as the penetration of Fe-Mn-Si melt, and the number of the MgO-rich inclusions significantly increase. The aluminium addition promotes the decarburization reaction, and the [Al] react with MgO directly to form Al<sub>2</sub>O<sub>3</sub>, follow by MgO·Al<sub>2</sub>O<sub>3</sub> was generated at around the periclase in MgO-C refractories, and the inclusions mainly transform from TiN-AlN to TiN-MgO-AlN with MgO core.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112753"},"PeriodicalIF":7.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-28DOI: 10.1016/j.corsci.2025.112748
Siyan Wang , Hongyao Du , Zhiyue Shi , Litao Zhang , Canshuai Liu , Zhijie Yan , Jianqiu Wang , Cunyu Wang , Wenquan Cao , Minjie Liang
High-nitrogen martensitic stainless steel (HNMSS) is widely used in chemical, marine, and medical applications due to its excellent mechanical properties and corrosion resistance. However, pitting corrosion remains a major issue, particularly in chloride-containing environments. The tempering process after quenching affects both the mechanical properties and microstructure of HNMSS, but its influence on pitting behavior is not well understood. This study investigates the effect of tempering duration on the pitting corrosion of HNMSS in 3.5 wt% NaCl solution. The HNMSS was solution-treated at 1030°C for 30 min, followed by oil quenching and cryogenic treatment, and then tempered at 500°C for 1–100 h. Microstructure characterization was performed using XRD, SEM, and TEM. Potentiodynamic polarization and EIS were used to assess pitting behavior, while in-situ electrochemical techniques and SEM were employed to observe corrosion morphology. The results showed that after solution treatment, HNMSS contained significant undissolved primary Cr2N, with no chromium carbides. Secondary Cr2N appeared only after 100 h of tempering. Pitting sensitivity increased with longer tempering times, with the pitting potential decreasing from 0.348 V (cryogenic treatment) to 0.124 V after 2 h of tempering. Beyond 5 h, pitting occurred without anodic polarization, resulting in loss of passivation. This behavior is related to the decrease in chromium content in the matrix surrounding the primary Cr₂N, which drops to 7.47 at% after 100 h of tempering. The primary Cr₂N had a more significant impact on pitting sensitivity than the secondary Cr₂N.
{"title":"The mechanisms underlying the effect of tempering time on the pitting behavior of high-nitrogen martensitic stainless steel","authors":"Siyan Wang , Hongyao Du , Zhiyue Shi , Litao Zhang , Canshuai Liu , Zhijie Yan , Jianqiu Wang , Cunyu Wang , Wenquan Cao , Minjie Liang","doi":"10.1016/j.corsci.2025.112748","DOIUrl":"10.1016/j.corsci.2025.112748","url":null,"abstract":"<div><div>High-nitrogen martensitic stainless steel (HNMSS) is widely used in chemical, marine, and medical applications due to its excellent mechanical properties and corrosion resistance. However, pitting corrosion remains a major issue, particularly in chloride-containing environments. The tempering process after quenching affects both the mechanical properties and microstructure of HNMSS, but its influence on pitting behavior is not well understood. This study investigates the effect of tempering duration on the pitting corrosion of HNMSS in 3.5 wt% NaCl solution. The HNMSS was solution-treated at 1030°C for 30 min, followed by oil quenching and cryogenic treatment, and then tempered at 500°C for 1–100 h. Microstructure characterization was performed using XRD, SEM, and TEM. Potentiodynamic polarization and EIS were used to assess pitting behavior, while in-situ electrochemical techniques and SEM were employed to observe corrosion morphology. The results showed that after solution treatment, HNMSS contained significant undissolved primary Cr<sub>2</sub>N, with no chromium carbides. Secondary Cr<sub>2</sub>N appeared only after 100 h of tempering. Pitting sensitivity increased with longer tempering times, with the pitting potential decreasing from 0.348 V (cryogenic treatment) to 0.124 V after 2 h of tempering. Beyond 5 h, pitting occurred without anodic polarization, resulting in loss of passivation. This behavior is related to the decrease in chromium content in the matrix surrounding the primary Cr₂N, which drops to 7.47 at% after 100 h of tempering. The primary Cr₂N had a more significant impact on pitting sensitivity than the secondary Cr₂N.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112748"},"PeriodicalIF":7.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-28DOI: 10.1016/j.corsci.2025.112751
Kejian Wei , Jiahong Wei , Guoqin Cao , Gang Cheng , Weihua Li , Junhua Hu , Sho Kano , Hiroaki Abe
Studying Zr(Cr, Fe)2 Laves phase oxidation is vital for deepening our understanding of the oxidation mechanism of accident tolerant fuel (ATF) Cr-coated Zr and Zr-based alloys. Here, an interesting oxidation phenomenon of Zr(Cr, Fe)2 Laves phase was confirmed for the first time. Meanwhile, this oxidation was accompanied by the Cr2O3 reduction. The lattice oxygen was transferred from Cr2O3 to Zr(Cr, Fe)2 Laves phases, and Cr2O3 was transformed into Cr while Zr(Cr, Fe)2 was oxidized into m-ZrO2, Cr and Fe. The reaction Gibbs Free energy (△r) value is around −980 kJ/mol without considering Fe, which verifies the feasibility of this interesting oxidation-reduction phenomenon.
{"title":"An interesting oxidation-reduction phenomenon between the Zr(Cr,Fe)2 Laves phase and Cr2O3 under high temperature","authors":"Kejian Wei , Jiahong Wei , Guoqin Cao , Gang Cheng , Weihua Li , Junhua Hu , Sho Kano , Hiroaki Abe","doi":"10.1016/j.corsci.2025.112751","DOIUrl":"10.1016/j.corsci.2025.112751","url":null,"abstract":"<div><div>Studying Zr(Cr, Fe)<sub>2</sub> Laves phase oxidation is vital for deepening our understanding of the oxidation mechanism of accident tolerant fuel (ATF) Cr-coated Zr and Zr-based alloys. Here, an interesting oxidation phenomenon of Zr(Cr, Fe)<sub>2</sub> Laves phase was confirmed for the first time. Meanwhile, this oxidation was accompanied by the Cr<sub>2</sub>O<sub>3</sub> reduction. The lattice oxygen was transferred from Cr<sub>2</sub>O<sub>3</sub> to Zr(Cr, Fe)<sub>2</sub> Laves phases, and Cr<sub>2</sub>O<sub>3</sub> was transformed into Cr while Zr(Cr, Fe)<sub>2</sub> was oxidized into <em>m</em>-ZrO<sub>2</sub>, Cr and Fe. The reaction Gibbs Free energy (△<sub>r</sub><span><math><msubsup><mrow><mi>G</mi></mrow><mrow><mi>m</mi></mrow><mrow><mi>Θ</mi></mrow></msubsup></math></span>) value is around −980 kJ/mol without considering Fe, which verifies the feasibility of this interesting oxidation-reduction phenomenon.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112751"},"PeriodicalIF":7.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-28DOI: 10.1016/j.corsci.2025.112747
Zhangmin Zhang , Shaolong Liu , Qiang You , Yangyang Wang , Xinran Li , Fahe Cao , Jie Hu , Jiangxiong Wei , Qijun Yu , Guoqing Geng
Ag/AgCl chloride-sensing electrode has been designed to monitor chloride concentrations in reinforced concrete. However, the interface transformation of Ag/AgCl electrode in concrete pore solution is not clarified. In this work, the transformation process of the same Ag/AgCl electrode in cement extract was monitored by EIS and SECM, followed by surface analysis. Dense AgCl film degraded into porous one, but the exposed Ag substrate was activated temporarily by Cl- in 10 min. The Ag substrate without AgCl covered can be easily absorbed by OH-, leading to alterations in the electrode potential during Cl- response.
{"title":"Probing transformation of Ag/AgCl chloride-sensing electrode interface in concrete pore solution","authors":"Zhangmin Zhang , Shaolong Liu , Qiang You , Yangyang Wang , Xinran Li , Fahe Cao , Jie Hu , Jiangxiong Wei , Qijun Yu , Guoqing Geng","doi":"10.1016/j.corsci.2025.112747","DOIUrl":"10.1016/j.corsci.2025.112747","url":null,"abstract":"<div><div>Ag/AgCl chloride-sensing electrode has been designed to monitor chloride concentrations in reinforced concrete. However, the interface transformation of Ag/AgCl electrode in concrete pore solution is not clarified. In this work, the transformation process of the same Ag/AgCl electrode in cement extract was monitored by EIS and SECM, followed by surface analysis. Dense AgCl film degraded into porous one, but the exposed Ag substrate was activated temporarily by Cl<sup>-</sup> in 10 min. The Ag substrate without AgCl covered can be easily absorbed by OH<sup>-</sup>, leading to alterations in the electrode potential during Cl<sup>-</sup> response.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112747"},"PeriodicalIF":7.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-28DOI: 10.1016/j.corsci.2025.112750
Peng Zhou , Siyu Sun , Xiangyan Liu , Shuhan Meng , Zhuoyang Du , Zheyuan Tang , Dongyi Li , Jingli Sun , Yong Yuan , Bernard Tribollet , Tao Zhang , Fuhui Wang
The remanufacture of damaged conversion coatings requires a dry-in-place, no rinsing process. This work reports a novel brushing conversion treatment method. The SEM and TEM analyses demonstrate a porous but more compact structure, whereas electrochemical measurements prove an enhanced corrosion resistance of brushing conversion coatings, as compared with the conventional immersion coatings. The more compact structure was ascribed to the accelerated coating growth kinetics under the continuous brushing, and the enhanced corrosion resistance was attributed to the retard of the penetration of corrosive ions in the maze-like porous structure.
{"title":"Brushing conversion coating on magnesium alloys: A promising dry-in-place phosphate conversion treatment with high corrosion resistance for coating repair on Mg alloys","authors":"Peng Zhou , Siyu Sun , Xiangyan Liu , Shuhan Meng , Zhuoyang Du , Zheyuan Tang , Dongyi Li , Jingli Sun , Yong Yuan , Bernard Tribollet , Tao Zhang , Fuhui Wang","doi":"10.1016/j.corsci.2025.112750","DOIUrl":"10.1016/j.corsci.2025.112750","url":null,"abstract":"<div><div>The remanufacture of damaged conversion coatings requires a dry-in-place, no rinsing process. This work reports a novel brushing conversion treatment method. The SEM and TEM analyses demonstrate a porous but more compact structure, whereas electrochemical measurements prove an enhanced corrosion resistance of brushing conversion coatings, as compared with the conventional immersion coatings. The more compact structure was ascribed to the accelerated coating growth kinetics under the continuous brushing, and the enhanced corrosion resistance was attributed to the retard of the penetration of corrosive ions in the maze-like porous structure.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112750"},"PeriodicalIF":7.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-28DOI: 10.1016/j.corsci.2025.112749
Lijin Dong , Maozhang Wu , Dong Ling , Hongli Wang , Huaibei Zheng , Cheng Ma , Li Liu , Qinying Wang
Mechanical properties and hydrogen environment assisted cracking (HEAC) resistance of AerMet 100 steel after single and double aging treatments were investigated. The fracture toughness increased by 10 –25 % after double aging treatment due to the higher faction of reversed austenite. Stronger hydrogen traps formed after double aging treatment decreased hydrogen diffusion rates. The double aging treatment increased the KTH by 20–60 % while lowered the da/dtII by 25–70 %. The improvement of HEAC resistance was related to the suppressed hydrogen diffusion and partitioning to the crack tip by carbides and reversed austenite, along with the enhanced austenite stability by Ni enrichment.
{"title":"Improved mechanical properties and hydrogen environment assisted cracking resistance of a secondary hardening ultra-high strength steel via double aging treatment","authors":"Lijin Dong , Maozhang Wu , Dong Ling , Hongli Wang , Huaibei Zheng , Cheng Ma , Li Liu , Qinying Wang","doi":"10.1016/j.corsci.2025.112749","DOIUrl":"10.1016/j.corsci.2025.112749","url":null,"abstract":"<div><div>Mechanical properties and hydrogen environment assisted cracking (HEAC) resistance of AerMet 100 steel after single and double aging treatments were investigated. The fracture toughness increased by 10 –25 % after double aging treatment due to the higher faction of reversed austenite. Stronger hydrogen traps formed after double aging treatment decreased hydrogen diffusion rates. The double aging treatment increased the <em>K</em><sub>TH</sub> by 20–60 % while lowered the d<em>a</em>/d<em>t</em><sub>II</sub> by 25–70 %. The improvement of HEAC resistance was related to the suppressed hydrogen diffusion and partitioning to the crack tip by carbides and reversed austenite, along with the enhanced austenite stability by Ni enrichment.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112749"},"PeriodicalIF":7.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143175887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-28DOI: 10.1016/j.corsci.2025.112746
Mengtian Liang, Jinpeng Zhang, Jie Gao, Huaqing Yi, Bingbing Yin, Zhenhua Yang, Fugang Qi, Yi Yang
High-entropy alloys (HEAs) are promising for extreme environments, but their high-temperature oxidation resistance remains a significant challenge. We have combined experimental data with the first principles to investigate the effect of titanium content on AlCoCrNiTix HEAs at 900 ℃. Results show that optimal Ti doping reduces the oxidation rate by two orders of magnitude and promotes the formation of a protective α-Al2O3 scale. This contrasts with previous findings by demonstrating the critical role of Ti in stabilising the oxide layer and preventing spalling. Our results provide a theoretical basis for the design of AlCoCrNi-based HEAs with improved high-temperature performance.
{"title":"Enhancing the oxidation resistance of AlCoCrNi high-entropy alloy via Ti-induced microstructural modifications","authors":"Mengtian Liang, Jinpeng Zhang, Jie Gao, Huaqing Yi, Bingbing Yin, Zhenhua Yang, Fugang Qi, Yi Yang","doi":"10.1016/j.corsci.2025.112746","DOIUrl":"10.1016/j.corsci.2025.112746","url":null,"abstract":"<div><div>High-entropy alloys (HEAs) are promising for extreme environments, but their high-temperature oxidation resistance remains a significant challenge. We have combined experimental data with the first principles to investigate the effect of titanium content on AlCoCrNiTi<sub><em>x</em></sub> HEAs at 900 ℃. Results show that optimal Ti doping reduces the oxidation rate by two orders of magnitude and promotes the formation of a protective α-Al<sub>2</sub>O<sub>3</sub> scale. This contrasts with previous findings by demonstrating the critical role of Ti in stabilising the oxide layer and preventing spalling. Our results provide a theoretical basis for the design of AlCoCrNi-based HEAs with improved high-temperature performance.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"246 ","pages":"Article 112746"},"PeriodicalIF":7.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-27DOI: 10.1016/j.corsci.2025.112703
Christopher L. Alexander , Stanley C. Agbakansi , Wesley Vitor Dantas De Carvalho Bezerra
Electrochemical impedance spectroscopy (EIS) is widely employed in laboratory investigations of steel corrosion in concrete. However, the complex geometry of reinforced concrete specimens presents significant challenges due to nonuniform current distributions, leading to frequency dispersion in the impedance response. This study explores the influence of specimen geometry on the impedance response of steel in concrete, focusing on the effects of current distribution and the resulting frequency dispersion.
A finite element model was developed to simulate the impedance response of singly reinforced concrete beam specimens, revealing key insights into the geometric factors that contribute to frequency dispersion. A characteristic length is defined for cases where the beam length exceeds that of the counter electrode, allowing determination of the frequencies influenced by the geometry induced dispersion. Evidence is presented to suggest that frequency dispersion may not be avoidable considering the typical resistivity range of concrete.
To address this issue, a mathematical expression is described that relates the apparent polarization resistance to the true polarization resistance by accounting for geometric factors and concrete resistivity. Recommendations are also provided for minimizing the effects of geometry-induced frequency dispersion in laboratory measurements, particularly by optimizing specimen geometry.
{"title":"Addressing geometric influences on electrochemical impedance spectroscopy for accurate corrosion assessment in steel-reinforced concrete beams","authors":"Christopher L. Alexander , Stanley C. Agbakansi , Wesley Vitor Dantas De Carvalho Bezerra","doi":"10.1016/j.corsci.2025.112703","DOIUrl":"10.1016/j.corsci.2025.112703","url":null,"abstract":"<div><div>Electrochemical impedance spectroscopy (EIS) is widely employed in laboratory investigations of steel corrosion in concrete. However, the complex geometry of reinforced concrete specimens presents significant challenges due to nonuniform current distributions, leading to frequency dispersion in the impedance response. This study explores the influence of specimen geometry on the impedance response of steel in concrete, focusing on the effects of current distribution and the resulting frequency dispersion.</div><div>A finite element model was developed to simulate the impedance response of singly reinforced concrete beam specimens, revealing key insights into the geometric factors that contribute to frequency dispersion. A characteristic length is defined for cases where the beam length exceeds that of the counter electrode, allowing determination of the frequencies influenced by the geometry induced dispersion. Evidence is presented to suggest that frequency dispersion may not be avoidable considering the typical resistivity range of concrete.</div><div>To address this issue, a mathematical expression is described that relates the apparent polarization resistance to the true polarization resistance by accounting for geometric factors and concrete resistivity. Recommendations are also provided for minimizing the effects of geometry-induced frequency dispersion in laboratory measurements, particularly by optimizing specimen geometry.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"247 ","pages":"Article 112703"},"PeriodicalIF":7.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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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