Corrosion Science最新文献

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Revealing anti-corrosion mechanism of low-alloyed Mg-Gd-Zn-Zr alloy with ultra-low corrosion rate

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-07 DOI: 10.1016/j.corsci.2025.112931

Zhihao Xu , Jinghuai Zhang , Yuying He , Qiang Yang , Shujuan Liu , Tengfei Zhao , Hao Dong , Ruizhi Wu , Xiaobo Zhang , Xin Qiu

Poor corrosion resistance is the inherent weakness of common Mg alloys, and consequentially, it would be a long-standing challenge to improve the corrosion resistance of Mg alloys to reach or approach that of other stainless metals while maintaining mechanical properties. Here, we successfully develop a low-alloyed Mg-2Gd-0.6Zn-0.3Zr (wt%) alloy having an ultra-low corrosion rate of 0.09 mm y⁻¹ coupled with good mechanical properties. Its corrosion resistance in 3.5 wt% NaCl solution is superior to that of ultra-high-purity Mg and other comparative Mg alloys. The ultra-high corrosion resistance is mainly attributed to three key factors. The relatively uniform microstructure of alloy substrate in terms of potential is the basic factor. The corrosion film exhibits superior corrosion resistance and passivation effect as well as self-healing ability. The enrichment of alloying elements and the formation of ZrO₂, Gd₂O₃, and ZnO with Pilling Bedworth Ratio between 1 and 2 in the corrosion film are conducive to reduce macroscopic defects and thus improve the stability and compactness of the corrosion film, which is another key factor. Amorphous ZrO₂ plays an important role in rapid formation of compact film. The more important finding of this study is that this corrosion film has amorphous characteristics to a large extent, which is believed to avoid microscopic defects from grain boundaries as rapid channels for Cl^- transport, and this is the third key factor for further reduction to achieve the ultra-low corrosion rate for the developed alloy. Our findings are expected to inspire the development of real stainless Mg alloys.

{"title":"Revealing anti-corrosion mechanism of low-alloyed Mg-Gd-Zn-Zr alloy with ultra-low corrosion rate","authors":"Zhihao Xu , Jinghuai Zhang , Yuying He , Qiang Yang , Shujuan Liu , Tengfei Zhao , Hao Dong , Ruizhi Wu , Xiaobo Zhang , Xin Qiu","doi":"10.1016/j.corsci.2025.112931","DOIUrl":"10.1016/j.corsci.2025.112931","url":null,"abstract":"<div><div>Poor corrosion resistance is the inherent weakness of common Mg alloys, and consequentially, it would be a long-standing challenge to improve the corrosion resistance of Mg alloys to reach or approach that of other stainless metals while maintaining mechanical properties. Here, we successfully develop a low-alloyed Mg-2Gd-0.6Zn-0.3Zr (wt%) alloy having an ultra-low corrosion rate of 0.09 mm y<sup>−1</sup> coupled with good mechanical properties. Its corrosion resistance in 3.5 wt% NaCl solution is superior to that of ultra-high-purity Mg and other comparative Mg alloys. The ultra-high corrosion resistance is mainly attributed to three key factors. The relatively uniform microstructure of alloy substrate in terms of potential is the basic factor. The corrosion film exhibits superior corrosion resistance and passivation effect as well as self-healing ability. The enrichment of alloying elements and the formation of ZrO<sub>2</sub>, Gd<sub>2</sub>O<sub>3</sub>, and ZnO with Pilling Bedworth Ratio between 1 and 2 in the corrosion film are conducive to reduce macroscopic defects and thus improve the stability and compactness of the corrosion film, which is another key factor. Amorphous ZrO<sub>2</sub> plays an important role in rapid formation of compact film. The more important finding of this study is that this corrosion film has amorphous characteristics to a large extent, which is believed to avoid microscopic defects from grain boundaries as rapid channels for Cl<sup>-</sup> transport, and this is the third key factor for further reduction to achieve the ultra-low corrosion rate for the developed alloy. Our findings are expected to inspire the development of real stainless Mg alloys.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"251 ","pages":"Article 112931"},"PeriodicalIF":7.4,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806919","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}

引用次数: 0

Stress corrosion cracking behavior of T91 steel in low oxygen concentration liquid lead-bismuth eutectic at 450°C

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-07 DOI: 10.1016/j.corsci.2025.112927

Qiang Lin , Ziyi Liu , Wenlong Zhao , Zhenxing Zhao , Bingjie Wu , Gang Chen , Xu Chen , Shouwen Shi

The compatibility issue of structural materials in liquid lead-bismuth eutectic environment significantly influences the safe operation of lead-cooled fast reactors, which becomes more complex in the presence of stress. However, the stress corrosion cracking behavior and mechanisms in liquid lead-bismuth eutectic environment remain unclear, especially at low oxygen concentration. In this study, the stress corrosion cracking behavior of T91 steel in low oxygen concentration liquid lead-bismuth eutectic environment at 450°C was investigated. The crack initiation mechanisms in T91 steel at the nano to micro scales are analyzed. It is found that stress promotes the formation of microchannels in the substrate. In addition, increasing stress also promotes the formation of low-angle grain boundaries, which enhance the diffusion of elements and the preferential formation of oxides at grain boundaries. The above process compromises the strength of grain boundaries and therefore results in the preferential initiation of microcracks at grain boundaries.

{"title":"Stress corrosion cracking behavior of T91 steel in low oxygen concentration liquid lead-bismuth eutectic at 450°C","authors":"Qiang Lin , Ziyi Liu , Wenlong Zhao , Zhenxing Zhao , Bingjie Wu , Gang Chen , Xu Chen , Shouwen Shi","doi":"10.1016/j.corsci.2025.112927","DOIUrl":"10.1016/j.corsci.2025.112927","url":null,"abstract":"<div><div>The compatibility issue of structural materials in liquid lead-bismuth eutectic environment significantly influences the safe operation of lead-cooled fast reactors, which becomes more complex in the presence of stress. However, the stress corrosion cracking behavior and mechanisms in liquid lead-bismuth eutectic environment remain unclear, especially at low oxygen concentration. In this study, the stress corrosion cracking behavior of T91 steel in low oxygen concentration liquid lead-bismuth eutectic environment at 450°C was investigated. The crack initiation mechanisms in T91 steel at the nano to micro scales are analyzed. It is found that stress promotes the formation of microchannels in the substrate. In addition, increasing stress also promotes the formation of low-angle grain boundaries, which enhance the diffusion of elements and the preferential formation of oxides at grain boundaries. The above process compromises the strength of grain boundaries and therefore results in the preferential initiation of microcracks at grain boundaries.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"251 ","pages":"Article 112927"},"PeriodicalIF":7.4,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820481","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}

引用次数: 0

Rust layer evolution and corrosion performance of Q500qENH weathering steel welded joints in salt-spray conditions

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-06 DOI: 10.1016/j.corsci.2025.112926

Kun Tang , Qinghua Zhang , Chuang Cui , Xiaopeng Yuan , Yapeng Li , Yan Ma

In this study, the microstructure, chemical composition, electrochemical properties, and evolution mechanism of the weld and base-metal rust layers formed on the Q500qENH weathering steel welded joints under salt-spray corrosion conditions were investigated. Through X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and energy-dispersive X-ray spectroscopy, the composition, microstructure, and elemental distribution of the rust layers were systematically characterized. Furthermore, electrochemical impedance spectroscopy and Tafel polarization methods were used to evaluate the corrosion resistance of the rust layers for different corrosion periods. Results showed that with prolonged corrosion time, the α-FeOOH content in the rust layer of the Q500qENH weathering steel welded joints increases significantly, while the γ-FeOOH content gradually decreases. The α-FeOOH/γ-FeOOH ratio in the weld rust layer remains consistently higher than that in the base-metal rust layer, exhibiting superior compactness and corrosion resistance. While the rust layer of the base metal displays a well-defined inner–outer stratification, the outer rust layer in the weld region is more complex, featuring cotton-ball-like, fibrous, and layered morphologies. Trace metal elements such as Cr, Ni, and Cu are enriched in the inner rust layers of both the weld and the base metal, forming compounds characterized by compact structures and corrosion-element adsorption effects. Electrochemical analyses indicate that the charge transfer resistance of the weld region is significantly higher than that of base metal.

{"title":"Rust layer evolution and corrosion performance of Q500qENH weathering steel welded joints in salt-spray conditions","authors":"Kun Tang , Qinghua Zhang , Chuang Cui , Xiaopeng Yuan , Yapeng Li , Yan Ma","doi":"10.1016/j.corsci.2025.112926","DOIUrl":"10.1016/j.corsci.2025.112926","url":null,"abstract":"<div><div>In this study, the microstructure, chemical composition, electrochemical properties, and evolution mechanism of the weld and base-metal rust layers formed on the Q500qENH weathering steel welded joints under salt-spray corrosion conditions were investigated. Through X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and energy-dispersive X-ray spectroscopy, the composition, microstructure, and elemental distribution of the rust layers were systematically characterized. Furthermore, electrochemical impedance spectroscopy and Tafel polarization methods were used to evaluate the corrosion resistance of the rust layers for different corrosion periods. Results showed that with prolonged corrosion time, the α-FeOOH content in the rust layer of the Q500qENH weathering steel welded joints increases significantly, while the γ-FeOOH content gradually decreases. The α-FeOOH/γ-FeOOH ratio in the weld rust layer remains consistently higher than that in the base-metal rust layer, exhibiting superior compactness and corrosion resistance. While the rust layer of the base metal displays a well-defined inner–outer stratification, the outer rust layer in the weld region is more complex, featuring cotton-ball-like, fibrous, and layered morphologies. Trace metal elements such as Cr, Ni, and Cu are enriched in the inner rust layers of both the weld and the base metal, forming compounds characterized by compact structures and corrosion-element adsorption effects. Electrochemical analyses indicate that the charge transfer resistance of the weld region is significantly higher than that of base metal.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"251 ","pages":"Article 112926"},"PeriodicalIF":7.4,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807293","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}

引用次数: 0

Experimental and modeling studies on the oxygen ingression behavior at the crevices of stainless steels in high-temperature water

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-05 DOI: 10.1016/j.corsci.2025.112897

Y. Soma , A. Komatsu , Y. Kaji , M. Yamamoto , T. Igarashi

Experimental

and modeling studies of the oxygen ingression at the crevices of stainless steels were conducted in high-temperature water (288°C). The limiting distance of oxygen ingression,

d_{\lim}

, was defined as the point beyond which the primary surface oxide changed (γ-Fe₂O₃–Fe₃O₄), regardless of crevice gap, oxygen concentration, and time. In situ measurements revealed increased electrical conductivity around the

d_{\lim}

position indicating ion enrichment due to a differential oxygen concentration cell.

d_{\lim}

increased with increasing crevice gap, oxygen concentration, and immersion time. Modeling study suggested that oxide layer growth reduced anodic dissolution and slowed oxygen consumption, allowing oxygen ingression with time.

引用次数: 0

Numerical simulation of corrosion in flanges under consideration of corrosion products and their porosity

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-05 DOI: 10.1016/j.corsci.2025.112898

Julian Schneider , Konstantin Kapfer , Marcel Mandel , Andreas Mittelbach , Lutz Krüger

The corrosion process of flanges formed by cataphoretically coated micro-alloyed cold-rolled steel and a polymer crevice former is investigated and simulated numerically using the finite element method (FEM). Boundary conditions are determined experimentally, including the effect of corrosion products on the diffusion of diluted species through the porous medium and the reaction kinetics on the surface of magnetite (Fe₃O₄) as a main corrosion product. Therefore, polarization curves are measured on sintered magnetite pellets. The experimental results as well as the temperature cycle in the test climate are used as boundary conditions in the numerical simulation. Finally, good agreement between the simulation and the experiment is achieved.

引用次数: 0

Revisiting a minimally destructive analytic approach for determining electrochemical kinetic parameters: Measuring aluminum corrosion across a wide pH range based on the Butler-Volmer equation

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-04 DOI: 10.1016/j.corsci.2025.112900

Seongkoo Cho , Stephen E. Weitzner , Alexandra Zagalskaya , Tim Hsu , Tuan Anh Pham , Homero Castaneda , Brandon C. Wood , Christine A. Orme

This study revisits the three-point sampling of the simplified Butler-Volmer equation to address the limitations of strong potentiodynamic polarization, which can introduce irreversible damage and uncertainty in corrosion analysis. The method extracts electrochemical kinetic parameters while minimizing polarization effects, evaluates noise sensitivity relative to overpotential, and accounts for errors from signal noise, OCP drift, ohmic resistance, and mass-transfer constraints. Verified against the Tafel extrapolation method for aluminum corrosion across a wide pH range, this low-polarization approach enables accurate evaluations with specific error estimates, offering a robust alternative to linear polarization resistance methods that assume constant Tafel slopes.

引用次数: 0

Mechanistic insights into electrochemical-mechanical coupling: PDM-based explanation for accelerated pitting corrosion of 09CrCuSb under low elastic stress

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-04 DOI: 10.1016/j.corsci.2025.112917

Zhiyuan Ning , Zhiheng Li , Qulan Zhou , Na Li , Digby D. Macdonald

The stress corrosion cracking (SCC) behavior of 09CrCuSb in sulfuric acid (70 wt%) under low constant tensile stress (0, 12, 24 MPa) was investigated. Chemical corrosion immersion, potentiodynamic polarization, and EIS experiments, coupled with XRD, SEM, and EDS analyses, revealed stress-induced localized dissolution accelerates pitting and pseudo-passive film degradation. A mechano-electrochemical model based on the Point Defect Model quantitatively linked stress with enhanced cation vacancy flux, reduced pseudo-passivation stability, and lower critical passivity breakdown potential. This framework advances the mechanistic understanding of SCC during crack initiation, providing valuable insights for predicting and preventing corrosion in industrial systems.

引用次数: 0

Unveiling the short-term oxidation behavior of nickel-base superalloy CMSX-4 in high-temperature air

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-03 DOI: 10.1016/j.corsci.2025.112915

Dan Zhao , Weidong Xuan , Guanlan Shao , Xueyu Che , Shujuan Wang , Jianbo Qi , Zhongming Ren

Nickel-based superalloys undergo oxidation in high-temperature corrosive environments, however, the oxidation behavior and mechanisms remain unclear. Combining multi-scale characterization techniques, Molecular Dynamics (MD) and density functional theory (DFT), this study investigated the oxidation behavior of the nickel-based superalloy CMSX-4 during the short-term oxidation in air at 1100 °C, with the aim of revealing the oxidation mechanism. The in-situ weight gain experiment demonstrates that the oxidation of the CMSX-4 alloy perfectly follows parabolic kinetics during the short-term oxidation stage. The sequence of oxidation for alloying elements is revealed to be influenced by diffusion, element concentration, and oxygen partial pressure. Specifically, Ni and Co elements preferentially undergo external oxidation, forming NiO and CoO on the surface of the alloy, while other elements experience internal oxidation. Initially, simple oxides form, and subsequently, some of these oxides react to produce complex spinel phases. Ultimately, a complex four-layer oxide scale develops, comprising an outer NiO and CoO layer, followed by a CoCr₂O₄ and TiTaO₄ layer, then a NiAl₂O₄ layer, and finally an innermost Al₂O₃ layer. The presence of a continuous, thick and dense Al₂O₃ layer ensured excellent oxidation resistance for CMSX-4 superalloys.

{"title":"Unveiling the short-term oxidation behavior of nickel-base superalloy CMSX-4 in high-temperature air","authors":"Dan Zhao , Weidong Xuan , Guanlan Shao , Xueyu Che , Shujuan Wang , Jianbo Qi , Zhongming Ren","doi":"10.1016/j.corsci.2025.112915","DOIUrl":"10.1016/j.corsci.2025.112915","url":null,"abstract":"<div><div>Nickel-based superalloys undergo oxidation in high-temperature corrosive environments, however, the oxidation behavior and mechanisms remain unclear. Combining multi-scale characterization techniques, Molecular Dynamics (MD) and density functional theory (DFT), this study investigated the oxidation behavior of the nickel-based superalloy CMSX-4 during the short-term oxidation in air at 1100 °C, with the aim of revealing the oxidation mechanism. The <em>in-situ</em> weight gain experiment demonstrates that the oxidation of the CMSX-4 alloy perfectly follows parabolic kinetics during the short-term oxidation stage. The sequence of oxidation for alloying elements is revealed to be influenced by diffusion, element concentration, and oxygen partial pressure. Specifically, Ni and Co elements preferentially undergo external oxidation, forming NiO and CoO on the surface of the alloy, while other elements experience internal oxidation. Initially, simple oxides form, and subsequently, some of these oxides react to produce complex spinel phases. Ultimately, a complex four-layer oxide scale develops, comprising an outer NiO and CoO layer, followed by a CoCr<sub>2</sub>O<sub>4</sub> and TiTaO<sub>4</sub> layer, then a NiAl<sub>2</sub>O<sub>4</sub> layer, and finally an innermost Al<sub>2</sub>O<sub>3</sub> layer. The presence of a continuous, thick and dense Al<sub>2</sub>O<sub>3</sub> layer ensured excellent oxidation resistance for CMSX-4 superalloys.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"251 ","pages":"Article 112915"},"PeriodicalIF":7.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792321","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}

引用次数: 0

From cast to wire-arc DED: An investigation on NAB alloy MIC resistance

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-03 DOI: 10.1016/j.corsci.2025.112910

Xiang Cai , Saike Chang , Mengmeng Yang , Shujun Li , Cheng Wang , Yanxin Qiao , Jian Zhou , Feng Xue

This paper presents a comparison of the microbiologically influenced corrosion (MIC) of the cast and multi-pass wire-arc directed energy deposition (DED) nickel-aluminum bronze (NAB) alloys in sulfate-reducing bacteria (SRB) solution. The corrosion of the alloys is concentrated in the large-sized κ phase and the residual β phase. Owing to the complete suppression of the precipitation of the large-size κ_Ⅰ phase and the reduction in the size of the remaining κ phase, the corrosion resistance of the wire-arc DED NAB alloys is higher than that of the cast alloys. The precipitated phases in the pre-deposition layer of the wire-arc DED NAB alloy in the lap zone are almost entirely converted to κ_Ⅲ and κ_Ⅳ phases, and the grain size of 6.7 μm is smaller than that of the substrate (12.6 μm). Thus, the corrosion sensitivity of the lap zone is higher, and the MIC resistance is lower than that of the substrate, the R_ct value after 30 d is 1.60 × 10⁵ Ω·cm² which is smaller than that of the substrate (1.96 ×10⁵ Ω·cm²).

{"title":"From cast to wire-arc DED: An investigation on NAB alloy MIC resistance","authors":"Xiang Cai , Saike Chang , Mengmeng Yang , Shujun Li , Cheng Wang , Yanxin Qiao , Jian Zhou , Feng Xue","doi":"10.1016/j.corsci.2025.112910","DOIUrl":"10.1016/j.corsci.2025.112910","url":null,"abstract":"<div><div>This paper presents a comparison of the microbiologically influenced corrosion (MIC) of the cast and multi-pass wire-arc directed energy deposition (DED) nickel-aluminum bronze (NAB) alloys in sulfate-reducing bacteria (SRB) solution. The corrosion of the alloys is concentrated in the large-sized κ phase and the residual β phase. Owing to the complete suppression of the precipitation of the large-size κ<sub>Ⅰ</sub> phase and the reduction in the size of the remaining κ phase, the corrosion resistance of the wire-arc DED NAB alloys is higher than that of the cast alloys. The precipitated phases in the pre-deposition layer of the wire-arc DED NAB alloy in the lap zone are almost entirely converted to κ<sub>Ⅲ</sub> and κ<sub>Ⅳ</sub> phases, and the grain size of 6.7 μm is smaller than that of the substrate (12.6 μm). Thus, the corrosion sensitivity of the lap zone is higher, and the MIC resistance is lower than that of the substrate, the <em>R</em><sub>ct</sub> value after 30 d is 1.60 × 10<sup>5</sup> Ω·cm<sup>2</sup> which is smaller than that of the substrate (1.96 ×10<sup>5</sup> Ω·cm<sup>2</sup>).</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"251 ","pages":"Article 112910"},"PeriodicalIF":7.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767538","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}

引用次数: 0

Revealing the mechanism of corrosion products deposition in Cr-coated fuel cladding

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science

Pub Date : 2025-04-03 DOI: 10.1016/j.corsci.2025.112916

Tao Huang , Fujie Zhou , Shixin Gao , Huifang Yue , Kun Zhang , Kai Chen , Hua Pang , Zhao Shen , Lefu Zhang

This study investigates the corrosion and deposition behavior of Cr-coated and uncoated Zr alloys, tested simultaneously under simulated reactor conditions using an internally heated loop system. Results demonstrate that the deposition layers on Cr-coated surfaces are consistently thicker than those on uncoated Zr alloys, with this distinction amplified under higher evaporation rates. At lower evaporation rates, porous layers predominantly composed of Ni(Fe,Cr)₂O₄ nanoparticles form, whereas higher rates lead to a duplex deposit structure with porous outer layers of Ni(Fe,Cr)₂O₄ and dense inner layers of CrOOH and Fe₂O₃. A dissolution-redeposition mechanism is proposed, wherein Cr dissolution produces Cr(VI), later reduced and redeposited as Cr(III) on both Cr-coated and Zr alloy surfaces. Thermodynamic analyses reveal Cr initially integrates into spinel phases (Ni(Fe_1.6Cr_0.4)O₄) until saturation, after which it precipitates as CrOOH. These findings provide insights into corrosion and deposition behavior and the implications of Cr coatings in reactor environments.

{"title":"Revealing the mechanism of corrosion products deposition in Cr-coated fuel cladding","authors":"Tao Huang , Fujie Zhou , Shixin Gao , Huifang Yue , Kun Zhang , Kai Chen , Hua Pang , Zhao Shen , Lefu Zhang","doi":"10.1016/j.corsci.2025.112916","DOIUrl":"10.1016/j.corsci.2025.112916","url":null,"abstract":"<div><div>This study investigates the corrosion and deposition behavior of Cr-coated and uncoated Zr alloys, tested simultaneously under simulated reactor conditions using an internally heated loop system. Results demonstrate that the deposition layers on Cr-coated surfaces are consistently thicker than those on uncoated Zr alloys, with this distinction amplified under higher evaporation rates. At lower evaporation rates, porous layers predominantly composed of Ni(Fe,Cr)<sub>2</sub>O<sub>4</sub> nanoparticles form, whereas higher rates lead to a duplex deposit structure with porous outer layers of Ni(Fe,Cr)<sub>2</sub>O<sub>4</sub> and dense inner layers of CrOOH and Fe<sub>2</sub>O<sub>3</sub>. A dissolution-redeposition mechanism is proposed, wherein Cr dissolution produces Cr(VI), later reduced and redeposited as Cr(III) on both Cr-coated and Zr alloy surfaces. Thermodynamic analyses reveal Cr initially integrates into spinel phases (Ni(Fe<sub>1.6</sub>Cr<sub>0.4</sub>)O<sub>4</sub>) until saturation, after which it precipitates as CrOOH. These findings provide insights into corrosion and deposition behavior and the implications of Cr coatings in reactor environments.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"251 ","pages":"Article 112916"},"PeriodicalIF":7.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783755","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}

引用次数: 0

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