Pub Date : 2025-03-25DOI: 10.1016/j.corsci.2025.112885
Darja Rudomilova , Tomáš Prošek , Andreas Muhr , Gerald Luckeneder
Differences in hydrogen entry behaviour for bare steel, zinc-coated steel with artificial defects in the coating, and steel with intact zinc coating were studied using scanning Kelvin probe technique. Pit formation was a key factor in the hydrogen entry mechanism for bare steel specimens. The steel/zinc interface covered with zinc corrosion products is the principal area of hydrogen entry into sheets with artificial defects in zinc coating. Hydrogen uptake was also observed in intact zinc-coated steel. The presence of a long line defect in the zinc coating led to almost eight times higher hydrogen uptake compared to bare steel.
{"title":"Hydrogen entry into zinc-coated steel induced by atmospheric corrosion after local chloride deposition","authors":"Darja Rudomilova , Tomáš Prošek , Andreas Muhr , Gerald Luckeneder","doi":"10.1016/j.corsci.2025.112885","DOIUrl":"10.1016/j.corsci.2025.112885","url":null,"abstract":"<div><div>Differences in hydrogen entry behaviour for bare steel, zinc-coated steel with artificial defects in the coating, and steel with intact zinc coating were studied using scanning Kelvin probe technique. Pit formation was a key factor in the hydrogen entry mechanism for bare steel specimens. The steel/zinc interface covered with zinc corrosion products is the principal area of hydrogen entry into sheets with artificial defects in zinc coating. Hydrogen uptake was also observed in intact zinc-coated steel. The presence of a long line defect in the zinc coating led to almost eight times higher hydrogen uptake compared to bare steel.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112885"},"PeriodicalIF":7.4,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725829","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 : 2025-03-24DOI: 10.1016/j.corsci.2025.112870
Chia-Yu Chang , Jianyue Zhang , Xiaolei Guo , Jiashi Miao , Daehyun Cho , Alan A. Luo
There is a Fe tolerance limit in pure magnesium or Mg-Al based alloys, and it is critical to control Fe impurity within such tolerance to avoid accelerated corrosion in Mg alloys. In this paper, the effect of Fe concentration (20–204 ppm) on the corrosion rate of a new ZAXEM11000 (Mg-1.0Zn-1.0Al-0.4Ca-0.2Ce-0.6Mn) alloy is investigated. Surprisingly, the corrosion rate of the ZAXEM11000 alloy increases linearly with the Fe concentration, rather than exponentially, as would typically be expected after surpassing the Fe tolerance limit. In particular, the corrosion rate of the ZAXEM11000 alloy with 204 ppm Fe is only five times higher than that of the alloy with 20 ppm Fe. At low Fe contents, the Fe-containing secondary phases tend to segregate near grain boundaries. As the Fe content increases, a more dispersive distribution of Fe-containing secondary phases is observed throughout the entire Mg matrix, likely due to the increased amount of Al(Mn,Fe) phase formed during solidification. The high density of Fe-containing secondary phases, which causes trenching of the surrounding Mg matrix, accelerates the overall corrosion rate of the Mg alloys by enhanced galvanic corrosion with high density of noble secondary phases. The results indicate that the corrosion behavior of this alloy system may be dominated by the distribution and morphology of secondary phases, particularly Al-Mn-Fe phases, that develops as the Fe content increases. This study provides a pathway of creating Mg alloys with a high tolerance limit of Fe through alloying.
{"title":"Effect of iron content on the corrosion rate of a new Mg-Zn-Al-Ca-Ce-Mn alloy system","authors":"Chia-Yu Chang , Jianyue Zhang , Xiaolei Guo , Jiashi Miao , Daehyun Cho , Alan A. Luo","doi":"10.1016/j.corsci.2025.112870","DOIUrl":"10.1016/j.corsci.2025.112870","url":null,"abstract":"<div><div>There is a Fe tolerance limit in pure magnesium or Mg-Al based alloys, and it is critical to control Fe impurity within such tolerance to avoid accelerated corrosion in Mg alloys. In this paper, the effect of Fe concentration (20–204 ppm) on the corrosion rate of a new ZAXEM11000 (Mg-1.0Zn-1.0Al-0.4Ca-0.2Ce-0.6Mn) alloy is investigated. Surprisingly, the corrosion rate of the ZAXEM11000 alloy increases linearly with the Fe concentration, rather than exponentially, as would typically be expected after surpassing the Fe tolerance limit. In particular, the corrosion rate of the ZAXEM11000 alloy with 204 ppm Fe is only five times higher than that of the alloy with 20 ppm Fe. At low Fe contents, the Fe-containing secondary phases tend to segregate near grain boundaries. As the Fe content increases, a more dispersive distribution of Fe-containing secondary phases is observed throughout the entire Mg matrix, likely due to the increased amount of Al(Mn,Fe) phase formed during solidification. The high density of Fe-containing secondary phases, which causes trenching of the surrounding Mg matrix, accelerates the overall corrosion rate of the Mg alloys by enhanced galvanic corrosion with high density of noble secondary phases. The results indicate that the corrosion behavior of this alloy system may be dominated by the distribution and morphology of secondary phases, particularly Al-Mn-Fe phases, that develops as the Fe content increases. This study provides a pathway of creating Mg alloys with a high tolerance limit of Fe through alloying.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112870"},"PeriodicalIF":7.4,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 : 2025-03-21DOI: 10.1016/j.corsci.2025.112879
Ahmet Hilmi Paksoy, Daniel Scotson, Esma Yilmaz, Ping Xiao
Regardless of the processing technique and resulting microstructure, when Environmental Barrier Coatings (EBCs) are exposed to high temperature in an air or steam environments, oxidation of the silicon bond coat forms a Thermally Grown Oxide (TGO). This study investigates the effect of steam oxidation on failure of air plasma sprayed (APS) EBCs consisting of a Yb2Si2O7 based topcoat and silicon bond coat, primarily focusing on changes at the topcoat and bond coat interface such as TGO thickness, interface roughness, pore size and pore morphology. Furthermore, it also explores the interfacial bonding behaviour at different length scales with scratch testing and in-situ cantilever beam bending. The findings reveal that the topcoat’s microstructure, including the crack network and grain size, influence the inhomogeneity in TGO thickness, while interfacial pore formation and non-uniform stress distribution weaken the TGO/topcoat interface.
{"title":"Interfacial characteristics and adhesion behaviour of ytterbium silicate environmental barrier coatings exposed to steam oxidation","authors":"Ahmet Hilmi Paksoy, Daniel Scotson, Esma Yilmaz, Ping Xiao","doi":"10.1016/j.corsci.2025.112879","DOIUrl":"10.1016/j.corsci.2025.112879","url":null,"abstract":"<div><div>Regardless of the processing technique and resulting microstructure, when Environmental Barrier Coatings (EBCs) are exposed to high temperature in an air or steam environments, oxidation of the silicon bond coat forms a Thermally Grown Oxide (TGO). This study investigates the effect of steam oxidation on failure of air plasma sprayed (APS) EBCs consisting of a Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub> based topcoat and silicon bond coat, primarily focusing on changes at the topcoat and bond coat interface such as TGO thickness, interface roughness, pore size and pore morphology. Furthermore, it also explores the interfacial bonding behaviour at different length scales with scratch testing and in-situ cantilever beam bending. The findings reveal that the topcoat’s microstructure, including the crack network and grain size, influence the inhomogeneity in TGO thickness, while interfacial pore formation and non-uniform stress distribution weaken the TGO/topcoat interface.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"251 ","pages":"Article 112879"},"PeriodicalIF":7.4,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776342","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}
Porous ZrB2-SiC ceramics are promising lightweight materials applied in harsh environments. However, excessive pores can degrade their mechanical properties and ablation resistance. This work aims to enhance the strength and ablation properties of porous ZrB2-SiC ceramic by depositing highly textured pyrolytic carbon (HTPyC) through the chemical vapor infiltration (CVI) method. The obtained ZrB2-SiC/HTPyC composite exhibited a low density of 2.97 ± 0.04 g/cm3 and superior mechanical properties. The Vickers hardness, longitudinal compressive stress, and radial compressive stress were 6.78 ± 1.0 GPa, 82.84 ± 6.48 MPa, and 91.96 ± 4.89 MPa, respectively, which were 129 %, 135 %, and 182 % higher than those of the original ZrB2-SiC porous ceramic. The ablation results revealed that the incorporation of HTPyC can significantly improve the ablation resistance of the ZrB2-SiC/HTPyC composite. After plasma flame ablation at 2300 °C for 120 s, the mass and linear ablation rates were 0.143 ± 0.013 mg/s and 0.583 ± 0.046 μm/s, respectively, contrasting with the rates of −4.888 ± 0.397 mg/s and 1.950 ± 0.214 μm/s for the ZrB2-SiC ceramic.
{"title":"Enhanced mechanical and ablation properties of lamellar porous ZrB2-SiC ceramics by highly textured pyrolytic carbon","authors":"Ze Zhang , Wanxian Fang , Mingyu Zhang , Chen Zeng , Qizhong Huang","doi":"10.1016/j.corsci.2025.112882","DOIUrl":"10.1016/j.corsci.2025.112882","url":null,"abstract":"<div><div>Porous ZrB<sub>2</sub>-SiC ceramics are promising lightweight materials applied in harsh environments. However, excessive pores can degrade their mechanical properties and ablation resistance. This work aims to enhance the strength and ablation properties of porous ZrB<sub>2</sub>-SiC ceramic by depositing highly textured pyrolytic carbon (HTPyC) through the chemical vapor infiltration (CVI) method. The obtained ZrB<sub>2</sub>-SiC/HTPyC composite exhibited a low density of 2.97 ± 0.04 g/cm<sup>3</sup> and superior mechanical properties. The Vickers hardness, longitudinal compressive stress, and radial compressive stress were 6.78 ± 1.0 GPa, 82.84 ± 6.48 MPa, and 91.96 ± 4.89 MPa, respectively, which were 129 %, 135 %, and 182 % higher than those of the original ZrB<sub>2</sub>-SiC porous ceramic. The ablation results revealed that the incorporation of HTPyC can significantly improve the ablation resistance of the ZrB<sub>2</sub>-SiC/HTPyC composite. After plasma flame ablation at 2300 °C for 120 s, the mass and linear ablation rates were 0.143 ± 0.013 mg/s and 0.583 ± 0.046 μm/s, respectively, contrasting with the rates of −4.888 ± 0.397 mg/s and 1.950 ± 0.214 μm/s for the ZrB<sub>2</sub>-SiC ceramic.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112882"},"PeriodicalIF":7.4,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681739","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 : 2025-03-20DOI: 10.1016/j.corsci.2025.112881
Yuming Xie , Jianing Dong , Lianmei Wu , Wei Wang , Xiuwen Sun , Xiangchen Meng , Yongxian Huang
Despite renowned for high specific strength and electromagnetic shielding properties, Mg alloys still suffer from localized corrosion due to the active chemical nature of Mg and the potential difference between second phases and Mg matrix. In this paper, we mediated fine-grained microstructures of AZ31 Mg alloys towards enhanced corrosion resistance via severe plastic deformation process. The stability of the passive films was promoted with refined average grain sizes from 12.25 μm to 5.58 μm. Pitting corrosion was suppressed through the fragmentation of band-like Al8Mn5 phases into dispersed fine particles. Significant amount of Mg₁₇Al₁₂ phases were dissolved into the matrix, leading to an increase in their corrosion potential by 0.06 V. In-situ stress corrosion potential was improved from −1.36 V vs. SCE to −1.26 V vs. SCE under external tensile stress equal to 100 % yield stress. A novel mechanical-electrochemical modeling with stress and time-dependent exponent was established to evaluate the effect of microstructural factors on the corrosion responses of fine-grained Mg alloys. The formation of the surficial passive films was accelerated due to the homogenization and grain refinement to suppress the corrosion rate, calibrated by the time-dependent exponent from 21 to 60 which characterizes the passivation film formation rate. The equivalent corrosion depth of these specimens under the external tensile stress decreased to one tenth, attributed to the stress-enhanced adhesion of the passive films to the Mg alloy surfaces.
{"title":"Unraveling the relationship between severe plastic deformation and corrosion responses of AZ31 Mg alloys","authors":"Yuming Xie , Jianing Dong , Lianmei Wu , Wei Wang , Xiuwen Sun , Xiangchen Meng , Yongxian Huang","doi":"10.1016/j.corsci.2025.112881","DOIUrl":"10.1016/j.corsci.2025.112881","url":null,"abstract":"<div><div>Despite renowned for high specific strength and electromagnetic shielding properties, Mg alloys still suffer from localized corrosion due to the active chemical nature of Mg and the potential difference between second phases and Mg matrix. In this paper, we mediated fine-grained microstructures of AZ31 Mg alloys towards enhanced corrosion resistance via severe plastic deformation process. The stability of the passive films was promoted with refined average grain sizes from 12.25 μm to 5.58 μm. Pitting corrosion was suppressed through the fragmentation of band-like Al<sub>8</sub>Mn<sub>5</sub> phases into dispersed fine particles. Significant amount of Mg₁₇Al₁₂ phases were dissolved into the matrix, leading to an increase in their corrosion potential by 0.06 V. <em>In-situ</em> stress corrosion potential was improved from −1.36 V vs. SCE to −1.26 V vs. SCE under external tensile stress equal to 100 % yield stress. A novel mechanical-electrochemical modeling with stress and time-dependent exponent was established to evaluate the effect of microstructural factors on the corrosion responses of fine-grained Mg alloys. The formation of the surficial passive films was accelerated due to the homogenization and grain refinement to suppress the corrosion rate, calibrated by the time-dependent exponent from 21 to 60 which characterizes the passivation film formation rate. The equivalent corrosion depth of these specimens under the external tensile stress decreased to one tenth, attributed to the stress-enhanced adhesion of the passive films to the Mg alloy surfaces.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112881"},"PeriodicalIF":7.4,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681740","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 : 2025-03-19DOI: 10.1016/j.corsci.2025.112875
Yuan Dong , Lu Wang , Renquan Wang , Ziyuyang Zheng , Keji Yue , Liyu Zhou , Jun Li , Ying Liu
This paper reported a hybrid strategy leveraging machine learning and experimental methods for high-throughput screening for compounds with erosion resistance to Nd-Fe-B melts. With structure and energy features, nine compounds were selected by the surrogate models, and the erosion thresholds were obtained. The failure behavior and mechanism of h-BN and MoB2 were discussed, and BN-TiB2 composite with excellent stability was discovered to solve the exfoliation problem faced by the commercial quenching nozzle. This study not only provided alternatives for the quenching nozzle, but also offered a high throughput method for screening materials with erosion resistance to alloy melt.
{"title":"Accelerated discovery of compounds with erosion resistance to Nd-Fe-B melt by machine learning","authors":"Yuan Dong , Lu Wang , Renquan Wang , Ziyuyang Zheng , Keji Yue , Liyu Zhou , Jun Li , Ying Liu","doi":"10.1016/j.corsci.2025.112875","DOIUrl":"10.1016/j.corsci.2025.112875","url":null,"abstract":"<div><div>This paper reported a hybrid strategy leveraging machine learning and experimental methods for high-throughput screening for compounds with erosion resistance to Nd-Fe-B melts. With structure and energy features, nine compounds were selected by the surrogate models, and the erosion thresholds were obtained. The failure behavior and mechanism of h-BN and MoB<sub>2</sub> were discussed, and BN-TiB<sub>2</sub> composite with excellent stability was discovered to solve the exfoliation problem faced by the commercial quenching nozzle. This study not only provided alternatives for the quenching nozzle, but also offered a high throughput method for screening materials with erosion resistance to alloy melt.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112875"},"PeriodicalIF":7.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681742","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 : 2025-03-19DOI: 10.1016/j.corsci.2025.112874
Bin Gong , Zhihao Chen , Wei Zhang , Chuyue Cai , Hengtong Xia , Bin Xu , Wenzhong Yang
This study introduces a novel strategy for developing a self-healing anticorrosion coating for AZ31 Mg alloy, achieved by incorporating L-aspartic acid (L-Asp)-modified MXene sheets and Ce3 + inhibitors into a polyacrylonitrile (PAN) electrospun three-dimensional vascular network within an epoxy matrix. The L-Asp modification improves MXene dispersion and stability, while the f-MXene-Ce3+@PAN network facilitates the controlled release of Ce3+ inhibitors in response to environmental stimuli. Electrochemical evaluation demonstrates notable enhancements in corrosion resistance, with the coating exhibiting robust barrier properties under intact conditions and efficient self-healing upon damage. This approach represents a promising advancement in long-term corrosion protection for aggressive environments.
{"title":"Electrospun fibers as delivery channels for inhibitors: Enhancing active protection in anti-corrosive coatings","authors":"Bin Gong , Zhihao Chen , Wei Zhang , Chuyue Cai , Hengtong Xia , Bin Xu , Wenzhong Yang","doi":"10.1016/j.corsci.2025.112874","DOIUrl":"10.1016/j.corsci.2025.112874","url":null,"abstract":"<div><div>This study introduces a novel strategy for developing a self-healing anticorrosion coating for AZ31 Mg alloy, achieved by incorporating L-aspartic acid (L-Asp)-modified MXene sheets and Ce<sup>3 +</sup> inhibitors into a polyacrylonitrile (PAN) electrospun three-dimensional vascular network within an epoxy matrix. The L-Asp modification improves MXene dispersion and stability, while the f-MXene-Ce<sup>3+</sup>@PAN network facilitates the controlled release of Ce<sup>3+</sup> inhibitors in response to environmental stimuli. Electrochemical evaluation demonstrates notable enhancements in corrosion resistance, with the coating exhibiting robust barrier properties under intact conditions and efficient self-healing upon damage. This approach represents a promising advancement in long-term corrosion protection for aggressive environments.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112874"},"PeriodicalIF":7.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681732","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 : 2025-03-19DOI: 10.1016/j.corsci.2025.112876
Chaoneng Dai , Zhangkang An , Shengfeng Guo , Jingfeng Wang
The microstructure, corrosion behavior, and mechanism of Mg-Er-Ni alloys with LPSO and Mg₂Ni eutectic phases are investigated, focusing on the effects of γ' phase introduction before and after low-temperature heat treatment. After heat treatment, the corrosion rate increases by 6.1–37.7 %, primarily due to the formation of new galvanic corrosion pairs caused by the high potential of the γ' phase, which also promotes corrosion propagation. Moreover, alloys with discontinuous intergranular LPSO and a high number density of intracrystalline lamellar γ' phases exhibit excellent degradation properties. This provides new insight for designing as-cast Mg alloys for fracturing tool with higher strength and faster degradation.
{"title":"A new strategy for enhancement of the degradation rate of Mg-Er-Ni alloys by introducing lamellar γ´-functional strengthening phase","authors":"Chaoneng Dai , Zhangkang An , Shengfeng Guo , Jingfeng Wang","doi":"10.1016/j.corsci.2025.112876","DOIUrl":"10.1016/j.corsci.2025.112876","url":null,"abstract":"<div><div>The microstructure, corrosion behavior, and mechanism of Mg-Er-Ni alloys with LPSO and Mg₂Ni eutectic phases are investigated, focusing on the effects of γ' phase introduction before and after low-temperature heat treatment. After heat treatment, the corrosion rate increases by 6.1–37.7 %, primarily due to the formation of new galvanic corrosion pairs caused by the high potential of the γ' phase, which also promotes corrosion propagation. Moreover, alloys with discontinuous intergranular LPSO and a high number density of intracrystalline lamellar γ' phases exhibit excellent degradation properties. This provides new insight for designing as-cast Mg alloys for fracturing tool with higher strength and faster degradation.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112876"},"PeriodicalIF":7.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681741","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 : 2025-03-19DOI: 10.1016/j.corsci.2025.112868
M. Karri , A. Verma , J.B. Singh
Alloy 693 is emerging as a better choice of structural material over Alloy 690 for the vitrification of nuclear waste in molten glass. Alloy 693 derives this advantage because of its superior high temperature corrosion resistance and mechanical strength due to the addition of Al and Ti. Alloy 693 forms coherent precipitates of strengthening γ′-phase particles, and also improves corrosion properties due to enhanced growth kinetics of the Cr2O3. Alloy 693 also tends to form precipitates of the Cr-rich α-phase, in addition to γ′-phase particles, both of which dissolve at temperatures above 1000°C. A limited published work reports better glass corrosion resistance of Alloy 693 over Alloy 690 in a borosilicate and Fe-phosphate glass melts, however, only at temperatures higher than 1000°C, which stabilizes two alloys in a single γ-phase. Present study reports the effect of γ′- and α-phase precipitates on the corrosion behaviour of Alloy 693 in a borosilicate glass melt at 900°C and 1000°C. Alloy 690 exposed under identical glass exposure condition has been used as a benchmark for comparison. The study demonstrates that, during initial period of glass exposure, Alloy 693 exhibits a corrosion resistance much lower than Alloy 690. The identification of corrosion mechanism has shown that the presence of unbounded Al in the alloy promotes higher metal loss, at least during initial periods of glass exposure, while the metal loss significantly reduces after the precipitation of γ′-phase particles in Alloy 693. Effect of γ'-phase and α-phase particles on the corrosion behaviour of Alloy 693 is discussed in the light of availability of Al and Cr solutes on the development of protective Cr2O3 layer.
{"title":"The influence of initial microstructure on interaction behaviour of Alloy 693 in borosilicate glass melt","authors":"M. Karri , A. Verma , J.B. Singh","doi":"10.1016/j.corsci.2025.112868","DOIUrl":"10.1016/j.corsci.2025.112868","url":null,"abstract":"<div><div>Alloy 693 is emerging as a better choice of structural material over Alloy 690 for the vitrification of nuclear waste in molten glass. Alloy 693 derives this advantage because of its superior high temperature corrosion resistance and mechanical strength due to the addition of Al and Ti. Alloy 693 forms coherent precipitates of strengthening γ′-phase particles, and also improves corrosion properties due to enhanced growth kinetics of the Cr<sub>2</sub>O<sub>3</sub>. Alloy 693 also tends to form precipitates of the Cr-rich α-phase, in addition to γ′-phase particles, both of which dissolve at temperatures above 1000°C. A limited published work reports better glass corrosion resistance of Alloy 693 over Alloy 690 in a borosilicate and Fe-phosphate glass melts, however, only at temperatures higher than 1000°C, which stabilizes two alloys in a single γ-phase. Present study reports the effect of γ′- and α-phase precipitates on the corrosion behaviour of Alloy 693 in a borosilicate glass melt at 900°C and 1000°C. Alloy 690 exposed under identical glass exposure condition has been used as a benchmark for comparison. The study demonstrates that, during initial period of glass exposure, Alloy 693 exhibits a corrosion resistance much lower than Alloy 690. The identification of corrosion mechanism has shown that the presence of unbounded Al in the alloy promotes higher metal loss, at least during initial periods of glass exposure, while the metal loss significantly reduces after the precipitation of γ′-phase particles in Alloy 693. Effect of γ'-phase and α-phase particles on the corrosion behaviour of Alloy 693 is discussed in the light of availability of Al and Cr solutes on the development of protective Cr<sub>2</sub>O<sub>3</sub> layer.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112868"},"PeriodicalIF":7.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681737","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 : 2025-03-19DOI: 10.1016/j.corsci.2025.112877
Jingtao Wang , Jiabao Zhang , Zhaoyang Zhang , Hao Zhu , Kun Xu , Yang Liu , Wei Xue , Tianlong Li
The complexation mechanism, passivation-related behaviors and interface structures of 07Cr16Ni6 in K3Cit solution were clarified. Cit3– contend against OH− for cationic, leading to the formation of tetra- or hexa-dentate complexes. The anodic dissolution behaviors revealed passive and transpassive behaviors. Passivation film presented a more capacitive, thicker, stable inner film and a weaker, thinner outer film, and the external and internal films were around 3 nm and 24 nm, respectively. Current efficiency increases gently, then rises steeply, finally stabilizes. The lath-type martensite dispersed on machined surface improved substantially as the current density increased. Finally, the anodic dissolution characteristic models and a high quality round hole were fabricated. The experimental results have proved the feasibility to manufacture high-quality metallic bipolar plates through electrochemical machining on 07Cr16Ni6 alloy in K3Cit solution.
{"title":"Anodic dissolution and passivation mechanisms of 07Cr16Ni6 in K3Cit solution and its electrochemical machining for microstructure","authors":"Jingtao Wang , Jiabao Zhang , Zhaoyang Zhang , Hao Zhu , Kun Xu , Yang Liu , Wei Xue , Tianlong Li","doi":"10.1016/j.corsci.2025.112877","DOIUrl":"10.1016/j.corsci.2025.112877","url":null,"abstract":"<div><div>The complexation mechanism, passivation-related behaviors and interface structures of 07Cr16Ni6 in K<sub>3</sub>Cit solution were clarified. Cit<sup>3–</sup> contend against OH<sup>−</sup> for cationic, leading to the formation of tetra- or hexa-dentate complexes. The anodic dissolution behaviors revealed passive and transpassive behaviors. Passivation film presented a more capacitive, thicker, stable inner film and a weaker, thinner outer film, and the external and internal films were around 3 nm and 24 nm, respectively. Current efficiency increases gently, then rises steeply, finally stabilizes. The lath-type martensite dispersed on machined surface improved substantially as the current density increased. Finally, the anodic dissolution characteristic models and a high quality round hole were fabricated. The experimental results have proved the feasibility to manufacture high-quality metallic bipolar plates through electrochemical machining on 07Cr16Ni6 alloy in K<sub>3</sub>Cit solution.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"250 ","pages":"Article 112877"},"PeriodicalIF":7.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681734","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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