Corrosion of carbon steel rebars in concrete structures significantly compromises their safety, reliability, and environmental performance. This work focuses on enhancing rebar corrosion resistance by repairing the defects of oxide scale. Here, sol-gel was employed as a carrier, by which Ce3+ and Ni2+ were transferred to the oxide scale defects based on the isoelectric point theory, and deposited at these defects with the pH variation as temperature. The repaired oxide scale showed enhanced uniform elemental distribution and improved electrochemical properties, maintaining integrity even under prolonged exposure to Cl−-rich environments. Notably, the impedance modulus at 0.01 Hz (|Z | 0.01Hz) of treated samples was six times higher than untreated ones, indicating superior performance against high electric fields. This strategy shows great potential for enhancing the durability of concrete structures.
{"title":"Repairment of carbon steel oxide scale using Ce³⁺ and Ni²⁺ doped sol-gel technique","authors":"Yanwei Zeng, Peng Xu, Tianguan Wang, Yuhao Xie, Guoqiang Liu, Huixuan Qian, Zhiyuan Feng, Bing Lei, Ping Zhang, Guozhe Meng","doi":"10.1038/s41529-024-00515-0","DOIUrl":"10.1038/s41529-024-00515-0","url":null,"abstract":"Corrosion of carbon steel rebars in concrete structures significantly compromises their safety, reliability, and environmental performance. This work focuses on enhancing rebar corrosion resistance by repairing the defects of oxide scale. Here, sol-gel was employed as a carrier, by which Ce3+ and Ni2+ were transferred to the oxide scale defects based on the isoelectric point theory, and deposited at these defects with the pH variation as temperature. The repaired oxide scale showed enhanced uniform elemental distribution and improved electrochemical properties, maintaining integrity even under prolonged exposure to Cl−-rich environments. Notably, the impedance modulus at 0.01 Hz (|Z | 0.01Hz) of treated samples was six times higher than untreated ones, indicating superior performance against high electric fields. This strategy shows great potential for enhancing the durability of concrete structures.","PeriodicalId":19270,"journal":{"name":"npj Materials Degradation","volume":" ","pages":"1-17"},"PeriodicalIF":6.6,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41529-024-00515-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-17DOI: 10.1038/s41529-024-00512-3
Felix Eckel, Daniel Van Opdenbosch, Katharina Sophie Schandl, Cordt Zollfrank
The molecular mass of biodegradable polymers often explains the varying biodegradation results in outdoor environments and determines the mechanical properties and embrittlement of polymer samples. Accordingly, we have investigated the relationship between the molecular mass of poly(butylene succinate) (PBS) and its tensile properties and mineralisation. With decreasing molecular mass, we found that Young’s modulus was rising while tensile strength and elongation at break were decreasing. A ductile-brittle transition was found between a Mw of 80,000 g/mol and 110,000 g/mol. The dependency of mechanical properties on molecular mass as determined after hydrolysis differed significantly from a study performed on freshly synthesised PBS. Biodegradation to CO2 by microorganisms in a mixture of field soil and compost soil was found to begin at a Mw between 8060 g/mol and 26,666 g/mol. These results are essential for estimating the service life of products made from PBS.
{"title":"Dependency of tensile properties and biodegradation on molecular mass during hydrolysis of poly(butylene succinate)","authors":"Felix Eckel, Daniel Van Opdenbosch, Katharina Sophie Schandl, Cordt Zollfrank","doi":"10.1038/s41529-024-00512-3","DOIUrl":"10.1038/s41529-024-00512-3","url":null,"abstract":"The molecular mass of biodegradable polymers often explains the varying biodegradation results in outdoor environments and determines the mechanical properties and embrittlement of polymer samples. Accordingly, we have investigated the relationship between the molecular mass of poly(butylene succinate) (PBS) and its tensile properties and mineralisation. With decreasing molecular mass, we found that Young’s modulus was rising while tensile strength and elongation at break were decreasing. A ductile-brittle transition was found between a Mw of 80,000 g/mol and 110,000 g/mol. The dependency of mechanical properties on molecular mass as determined after hydrolysis differed significantly from a study performed on freshly synthesised PBS. Biodegradation to CO2 by microorganisms in a mixture of field soil and compost soil was found to begin at a Mw between 8060 g/mol and 26,666 g/mol. These results are essential for estimating the service life of products made from PBS.","PeriodicalId":19270,"journal":{"name":"npj Materials Degradation","volume":" ","pages":"1-7"},"PeriodicalIF":6.6,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41529-024-00512-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-17DOI: 10.1038/s41529-024-00514-1
Georgios A. Kotsakis, Li Xie, Danyal A. Siddiqui, Diane Daubert, Daniel J. Graham, Francisco Javier Gil
Motivated by clinical problems of titanium implant degradation, we developed a workflow that enabled assessment of surface oxide dynamics as a function of clinical interventions and inflammation conditions. We found that mechanical damage led to decrease of stoichiometric TiO2 ratio in the passivation oxide film and further resulted in accelerated degradation under inflammatory anaerobic conditions. This method can be employed for the assessment of surface oxides to monitor implant safety.
{"title":"Dynamic assessment of titanium surface oxides following mechanical damage reveals only partial passivation under inflammatory conditions","authors":"Georgios A. Kotsakis, Li Xie, Danyal A. Siddiqui, Diane Daubert, Daniel J. Graham, Francisco Javier Gil","doi":"10.1038/s41529-024-00514-1","DOIUrl":"10.1038/s41529-024-00514-1","url":null,"abstract":"Motivated by clinical problems of titanium implant degradation, we developed a workflow that enabled assessment of surface oxide dynamics as a function of clinical interventions and inflammation conditions. We found that mechanical damage led to decrease of stoichiometric TiO2 ratio in the passivation oxide film and further resulted in accelerated degradation under inflammatory anaerobic conditions. This method can be employed for the assessment of surface oxides to monitor implant safety.","PeriodicalId":19270,"journal":{"name":"npj Materials Degradation","volume":" ","pages":"1-6"},"PeriodicalIF":6.6,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41529-024-00514-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-16DOI: 10.1038/s41529-024-00511-4
Liang-Liang Wu, Hao-Jie Yan, Tao Fan, Qing-Qing Sun, Lian-Kui Wu, Fa-He Cao
In this study, SiO2 coating was electrodeposited on Ti45Al8.5Nb alloy to enhance its oxidation resistance at 900 °C. The focus was on the interaction between SiO2 coating and the alloy substrate, and specifically, the role of the Nb element in this context. The formation of a SiO2/(Ti, Nb)O2/Ti5Si3 + Al2O3 three-layer oxide scale significantly inhibits the inward diffusion of oxygen. Beyond the characteristic Ti5Si3 + Al2O3 layer at the interface, the Nb2Al phase embedded within Ti5Si3 was observed. Concurrently, the presence of a (Ti, Nb)O2 layer was confirmed. The relationship between the coating thickness and oxidation resistance was also investigated. It was found that the thickness of the SiO2 coating affects the density of the oxide scale and the inward diffusion rate of oxygen. Moreover, due to the good adhesion to the substrate, the derived oxide scale exhibited good anti-peeling performance when subjected to a cyclic oxidation test.
{"title":"The oxidation behavior and interfacial reaction between SiO2 coating and Ti45Al8.5Nb alloy","authors":"Liang-Liang Wu, Hao-Jie Yan, Tao Fan, Qing-Qing Sun, Lian-Kui Wu, Fa-He Cao","doi":"10.1038/s41529-024-00511-4","DOIUrl":"10.1038/s41529-024-00511-4","url":null,"abstract":"In this study, SiO2 coating was electrodeposited on Ti45Al8.5Nb alloy to enhance its oxidation resistance at 900 °C. The focus was on the interaction between SiO2 coating and the alloy substrate, and specifically, the role of the Nb element in this context. The formation of a SiO2/(Ti, Nb)O2/Ti5Si3 + Al2O3 three-layer oxide scale significantly inhibits the inward diffusion of oxygen. Beyond the characteristic Ti5Si3 + Al2O3 layer at the interface, the Nb2Al phase embedded within Ti5Si3 was observed. Concurrently, the presence of a (Ti, Nb)O2 layer was confirmed. The relationship between the coating thickness and oxidation resistance was also investigated. It was found that the thickness of the SiO2 coating affects the density of the oxide scale and the inward diffusion rate of oxygen. Moreover, due to the good adhesion to the substrate, the derived oxide scale exhibited good anti-peeling performance when subjected to a cyclic oxidation test.","PeriodicalId":19270,"journal":{"name":"npj Materials Degradation","volume":" ","pages":"1-15"},"PeriodicalIF":6.6,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41529-024-00511-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142251906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-10DOI: 10.1038/s41529-024-00510-5
Salil Sainis, Dan Persson, Karin Törne, Johan Tidblad, Dominique Thierry
An approach involving the quantification of microstructure characterized by different techniques such as SEM, EDS, and SKPFM is statistically treated to provide a deeper insight into the influence of recycling AA6063 on localized corrosion susceptibility. Particularly, the intermetallic particles and the two forms of localized corrosion – pitting and intergranular corrosion are systematically documented, measured, and analyzed. Even trace amounts of Cu and Zn introduced into the alloy from recycling had a remarkable effect on the localized corrosion susceptibility. The study found that the initiation and early evolution of the two localized corrosions are in competition, and the predominance of one over the other is closely linked to the composition of the alloy, and microstructure. Recycled variants with higher trace Cu made the alloy more susceptible to pitting attack whereas higher trace Zn is linked with greater IGC susceptibility. The trace amount of higher Zn addition has a particularly beneficial effect on pitting susceptibility as it reduces the likelihood of pitting even in alloys with a higher trace Cu content. The SKPFM results obtained in this study provided a basis for the circumferential pitting susceptibility around intermetallic particles, as a higher volta potential difference (∆V) implied a higher driving force for corrosion. ∆V differences between the different variants were further explained based on trace recycled element distribution in the microstructure.
{"title":"The influence of recycling on the localized corrosion susceptibility of extruded AA6063 alloys","authors":"Salil Sainis, Dan Persson, Karin Törne, Johan Tidblad, Dominique Thierry","doi":"10.1038/s41529-024-00510-5","DOIUrl":"10.1038/s41529-024-00510-5","url":null,"abstract":"An approach involving the quantification of microstructure characterized by different techniques such as SEM, EDS, and SKPFM is statistically treated to provide a deeper insight into the influence of recycling AA6063 on localized corrosion susceptibility. Particularly, the intermetallic particles and the two forms of localized corrosion – pitting and intergranular corrosion are systematically documented, measured, and analyzed. Even trace amounts of Cu and Zn introduced into the alloy from recycling had a remarkable effect on the localized corrosion susceptibility. The study found that the initiation and early evolution of the two localized corrosions are in competition, and the predominance of one over the other is closely linked to the composition of the alloy, and microstructure. Recycled variants with higher trace Cu made the alloy more susceptible to pitting attack whereas higher trace Zn is linked with greater IGC susceptibility. The trace amount of higher Zn addition has a particularly beneficial effect on pitting susceptibility as it reduces the likelihood of pitting even in alloys with a higher trace Cu content. The SKPFM results obtained in this study provided a basis for the circumferential pitting susceptibility around intermetallic particles, as a higher volta potential difference (∆V) implied a higher driving force for corrosion. ∆V differences between the different variants were further explained based on trace recycled element distribution in the microstructure.","PeriodicalId":19270,"journal":{"name":"npj Materials Degradation","volume":" ","pages":"1-12"},"PeriodicalIF":6.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41529-024-00510-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-06DOI: 10.1038/s41529-024-00446-w
Pavel Anatolyevich Nikolaychuk, Ernst Kozeschnik
Aluminum and magnesium are the lightest structural metals, and therefore, various alloys based on them are widely used in both, automotive and aerospace industries. However, aluminum and magnesium are very easily affected by atmospheric and aqueous corrosion, and, therefore, the alloying elements should enhance their corrosion stability. In this work, the thermodynamic analysis of phase and chemical equilibria involving aluminum and magnesium alloys doped with silicon in oxygen–containing air environments, as well as the analysis of chemical and electrochemical equilibria involving these alloys in aqueous environments is conducted. The phase and chemical equiliibria in the Al–Mg, Al–Si, Mg–Si, and Al–Mg–Si systems at 298 K are considered, and the thermodynamic activities of the components of common Al–Mg–Si system alloys are calculated. The invariant chemical equilibria in the systems Al–Mg–O, Al–Si–O, Mg–Si–O at 298 K are considered, the isothermal section of the state diagrams of these systems are plotted, and the oxidation scheme of the Al–Mg–Si system alloys in excess oxygen is proposed. The chemical and electrochemical equilibria in the Al–Mg–Si–H2O system at 298 K are considered and presented in form of the activity – pH and the potential – pH diagrams, and the oxidation of the Al–Mg–Si system alloys in aqueous environments is discussed.
铝和镁是最轻的结构金属，因此，以它们为基础的各种合金被广泛应用于汽车和航空航天工业。然而，铝和镁非常容易受到大气腐蚀和水腐蚀的影响，因此合金元素应增强其腐蚀稳定性。本研究对含氧空气环境中掺硅铝镁合金的相平衡和化学平衡进行了热力学分析，并对水环境中这些合金的化学平衡和电化学平衡进行了分析。研究考虑了 298 K 时 Al-Mg、Al-Si、Mg-Si 和 Al-Mg-Si 系统中的相平衡和化学平衡，并计算了常见 Al-Mg-Si 系统合金各组分的热力学活动。考虑了 298 K 下 Al-Mg-O、Al-Si-O、Mg-Si-O 体系的不变化学平衡，绘制了这些体系的等温段状态图，并提出了 Al-Mg-Si 体系合金在过量氧气中的氧化方案。考虑了 298 K 时 Al-Mg-Si-H2O 系统中的化学和电化学平衡，并以活度-pH 图和电位-pH 图的形式表示出来，还讨论了 Al-Mg-Si 系统合金在水环境中的氧化问题。
{"title":"Thermodynamic evaluation of the aerial and aqueous oxidation of Al – Mg, Al – Si and Al – Mg – Si system alloys at 298 K","authors":"Pavel Anatolyevich Nikolaychuk, Ernst Kozeschnik","doi":"10.1038/s41529-024-00446-w","DOIUrl":"10.1038/s41529-024-00446-w","url":null,"abstract":"Aluminum and magnesium are the lightest structural metals, and therefore, various alloys based on them are widely used in both, automotive and aerospace industries. However, aluminum and magnesium are very easily affected by atmospheric and aqueous corrosion, and, therefore, the alloying elements should enhance their corrosion stability. In this work, the thermodynamic analysis of phase and chemical equilibria involving aluminum and magnesium alloys doped with silicon in oxygen–containing air environments, as well as the analysis of chemical and electrochemical equilibria involving these alloys in aqueous environments is conducted. The phase and chemical equiliibria in the Al–Mg, Al–Si, Mg–Si, and Al–Mg–Si systems at 298 K are considered, and the thermodynamic activities of the components of common Al–Mg–Si system alloys are calculated. The invariant chemical equilibria in the systems Al–Mg–O, Al–Si–O, Mg–Si–O at 298 K are considered, the isothermal section of the state diagrams of these systems are plotted, and the oxidation scheme of the Al–Mg–Si system alloys in excess oxygen is proposed. The chemical and electrochemical equilibria in the Al–Mg–Si–H2O system at 298 K are considered and presented in form of the activity – pH and the potential – pH diagrams, and the oxidation of the Al–Mg–Si system alloys in aqueous environments is discussed.","PeriodicalId":19270,"journal":{"name":"npj Materials Degradation","volume":" ","pages":"1-26"},"PeriodicalIF":6.6,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41529-024-00446-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-03DOI: 10.1038/s41529-024-00507-0
Meihui Sun, Xingyu Xiao, Xuexu Xu, Jiangwen Li, Tan Zhao, Li Gong, Cuiwei Du, Xiaogang Li
The influence of co-regulating Mo and Sn on the corrosion resistance of low alloy steel in tropical marine atmospheric was investigated. The combined addition of Mo and Sn has been found to significantly improve the corrosion resistance of low alloy steel, augmenting the protective capabilities of the rust layer. This combined addition promotes the formation of protective compounds like α-FeOOH and FeCr2O4 within the alloy rust layer. Furthermore, it facilitates the conversion of Cr, Ni and Cu into corrosion-resistant oxides such as Cr2O3, NiFe2O4 and CuO, thereby enhancing the density of the rust layer. Additionally, as corrosion progresses over time, higher levels of Sn addition lead to increased Sn content within the inner rust layer, consequently bolstering the protective qualities of the rust layer. This comprehensive understanding sheds light on the synergistic effects of Mo and Sn in fortifying the corrosion resistance of low alloy steel, offering insights for the development of advanced corrosion-resistant materials in marine environments.
研究了在热带海洋大气中共同调节 Mo 和 Sn 对低合金钢耐腐蚀性的影响。研究发现，Mo 和 Sn 的联合添加能显著提高低合金钢的耐腐蚀性，增强锈层的保护能力。这种联合添加可促进合金锈层中α-FeOOH 和 FeCr2O4 等保护性化合物的形成。此外，它还有助于将 Cr、Ni 和 Cu 转化为 Cr2O3、NiFe2O4 和 CuO 等耐腐蚀氧化物，从而提高锈层的密度。此外，随着腐蚀时间的推移，锡添加量的增加会导致内锈层中锡含量的增加，从而提高锈层的保护质量。这种全面的认识揭示了 Mo 和 Sn 在增强低合金钢耐腐蚀性方面的协同作用，为开发海洋环境中的先进耐腐蚀材料提供了启示。
{"title":"Effect of Mo and Sn co-regulation on low alloy steel corrosion in tropical marine atmosphere","authors":"Meihui Sun, Xingyu Xiao, Xuexu Xu, Jiangwen Li, Tan Zhao, Li Gong, Cuiwei Du, Xiaogang Li","doi":"10.1038/s41529-024-00507-0","DOIUrl":"10.1038/s41529-024-00507-0","url":null,"abstract":"The influence of co-regulating Mo and Sn on the corrosion resistance of low alloy steel in tropical marine atmospheric was investigated. The combined addition of Mo and Sn has been found to significantly improve the corrosion resistance of low alloy steel, augmenting the protective capabilities of the rust layer. This combined addition promotes the formation of protective compounds like α-FeOOH and FeCr2O4 within the alloy rust layer. Furthermore, it facilitates the conversion of Cr, Ni and Cu into corrosion-resistant oxides such as Cr2O3, NiFe2O4 and CuO, thereby enhancing the density of the rust layer. Additionally, as corrosion progresses over time, higher levels of Sn addition lead to increased Sn content within the inner rust layer, consequently bolstering the protective qualities of the rust layer. This comprehensive understanding sheds light on the synergistic effects of Mo and Sn in fortifying the corrosion resistance of low alloy steel, offering insights for the development of advanced corrosion-resistant materials in marine environments.","PeriodicalId":19270,"journal":{"name":"npj Materials Degradation","volume":" ","pages":"1-14"},"PeriodicalIF":6.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41529-024-00507-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-03DOI: 10.1038/s41529-024-00503-4
Christina Margarita Charalampidou, Nicoleta Siskou, Dimitris Georgoulis, Stavros K. Kourkoulis, Mikhail Zheludkevich, Nikolaos D. Alexopoulos
The effect of artificial-ageing on corrosion behaviour of aluminium alloy (AA)2024-T3 was investigated. The natural ageing which takes place during the aircraft''s lifespan was simulated with isothermal heat-treatments at 190 °C. Electrochemical impedance spectroscopy measurements were performed in different heat-treated specimens to examine the prevailing corrosion mechanisms. Additionally, pre-corroded tensile specimens from different heat-treatment conditions were mechanically tested to assess the corrosion-induced degradation. Different forms of corrosion were revealed in the investigated ageing tempers; intense localized attack was noticed in the initial (T3) and under-aged (UA) tempers. UA condition exhibited the highest susceptibility to corrosion propagation followed by T3, according to the charge transfer resistance RCT and degradation rate of tensile elongation at fracture Af ( ≈ 0.118) and ( ≈ 0.103), respectively. Corrosion-induced degradation rates for the peak-aged (PA) and over-aged (OA) tempers ( ≈ 0.042 and 0.054, respectively) were almost one third of UA, attributed to volume fraction and size of the precipitated second-phase particles.
研究了人工老化对铝合金 (AA)2024-T3 腐蚀性能的影响。通过 190 °C 等温热处理模拟了飞机寿命期间发生的自然老化。对不同的热处理试样进行了电化学阻抗光谱测量，以研究主要的腐蚀机制。此外，还对不同热处理条件下的预腐蚀拉伸试样进行了机械测试，以评估腐蚀引起的降解。在所研究的老化温度中发现了不同形式的腐蚀；在初始温度（T3）和欠老化温度（UA）中发现了强烈的局部侵蚀。根据电荷转移电阻 RCT 和断裂处拉伸伸长率 Af ( ≈ 0.118) 和 ( ≈ 0.103) 的降解率，UA 条件对腐蚀扩展的敏感性最高，其次是 T3。峰值老化（PA）和超老化（OA）温度下的腐蚀诱导降解率（分别≈ 0.042 和 0.054）几乎是 UA 的三分之一，这归因于析出的第二相颗粒的体积分数和大小。
{"title":"Corrosion of aluminium alloy AA2024-Τ3 specimens subjected to different artificial ageing heat treatments","authors":"Christina Margarita Charalampidou, Nicoleta Siskou, Dimitris Georgoulis, Stavros K. Kourkoulis, Mikhail Zheludkevich, Nikolaos D. Alexopoulos","doi":"10.1038/s41529-024-00503-4","DOIUrl":"10.1038/s41529-024-00503-4","url":null,"abstract":"The effect of artificial-ageing on corrosion behaviour of aluminium alloy (AA)2024-T3 was investigated. The natural ageing which takes place during the aircraft''s lifespan was simulated with isothermal heat-treatments at 190 °C. Electrochemical impedance spectroscopy measurements were performed in different heat-treated specimens to examine the prevailing corrosion mechanisms. Additionally, pre-corroded tensile specimens from different heat-treatment conditions were mechanically tested to assess the corrosion-induced degradation. Different forms of corrosion were revealed in the investigated ageing tempers; intense localized attack was noticed in the initial (T3) and under-aged (UA) tempers. UA condition exhibited the highest susceptibility to corrosion propagation followed by T3, according to the charge transfer resistance RCT and degradation rate of tensile elongation at fracture Af ( ≈ 0.118) and ( ≈ 0.103), respectively. Corrosion-induced degradation rates for the peak-aged (PA) and over-aged (OA) tempers ( ≈ 0.042 and 0.054, respectively) were almost one third of UA, attributed to volume fraction and size of the precipitated second-phase particles.","PeriodicalId":19270,"journal":{"name":"npj Materials Degradation","volume":" ","pages":"1-19"},"PeriodicalIF":6.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41529-024-00503-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-02DOI: 10.1038/s41529-024-00496-0
Pierre Frugier, Nicole Godon, Yves Minet
The MOS model (acronym coming from the French MOdèle Simplifié) was born from the desire to have a simple tool that can quantify the contribution of the diffusive reactive environment to the alteration of a vitrified nuclear waste package in deep geological disposal conditions. In the model, this environmental contribution consists partly of the ability of iron, metallic casing corrosion products, and argillite to consume silicon, and partly of the brake on diffusive transport provided by silicon through the successive layers of environmental material. It is a modeling tool serving as an intermediary between operational modeling for the calculation of the source term from the glass, mathematically more simple and giving higher upper margins, and models that use geochemistry and transport, giving greater accuracy for the interactions between glass and its environment. The goal of the MOS model is to calculate the possible impact of silicon reactive diffusion on the alteration rate within the different layers of material surrounding nuclear glass. This article lists the simplifying hypotheses on which the MOS is based, presents the digital resolution method for an environment consisting of several successive layers with different reactivity and transport properties, and explains the model’s implementation.
MOS 模型（缩写来自法文 MOdèle Simplifié）的诞生源于人们对一种简单工具的渴望，这种工具可以量化扩散反应环境对深地质处置条件下玻璃化核废料包的改变所起的作用。在该模型中，这种环境贡献部分包括铁、金属套管腐蚀产物和闪长岩消耗硅的能力，部分包括硅通过连续的环境材料层对扩散传输的抑制作用。它是一种建模工具，介于计算玻璃源项的操作建模和使用地球化学和迁移的模型之间，前者在数学上更简单，上限也更高，后者则能更精确地计算玻璃与其环境之间的相互作用。MOS 模型的目标是计算硅反应扩散对核玻璃周围不同物质层内的蚀变率可能产生的影响。本文列出了 MOS 所依据的简化假设，介绍了由具有不同反应性和传输特性的多个连续层组成的环境的数字解析方法，并解释了该模型的实施。
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