Pub Date : 2025-01-06DOI: 10.1016/j.corsci.2025.112689
Dou Hu , Xiaoxuan Li , Songlin Chen , Yutai Zhang , Zhe Fan , Kefei Yan , Qiangang Fu
Thermally sprayed Zr-Ta-Si-O coatings were investigated to overcome the oxygen blocking limitations of traditionally self-derived porous ZrO2 layer. The individual solid solution of Ta and Si into ZrO2 lattice was respectively found trapped in the rapid phase precipitation and volatile loss, thus exhibiting insufficient ablation property. The as-designed Zr0.92Ta0.04Si0.04O2 coating successfully acquired a near-zero linear recession rate (-0.10 μm/s) after 900 s cyclic ablation (2.4 MW/m2, 15 cycles). Key reasons can be attributed to a continuous sintering promotion and secondary phase precipitation limitation via large lattice distortion, where that of Zr7/8Ta1/16Si1/16O2 lattice exhibits over 200 % increase than Zr7/8Ta1/8O2 lattice.
{"title":"Design of long-term ablation protective Zr0.92Ta0.04Si0.04O2 coating via large lattice distortion and limited phase precipitation","authors":"Dou Hu , Xiaoxuan Li , Songlin Chen , Yutai Zhang , Zhe Fan , Kefei Yan , Qiangang Fu","doi":"10.1016/j.corsci.2025.112689","DOIUrl":"10.1016/j.corsci.2025.112689","url":null,"abstract":"<div><div>Thermally sprayed Zr-Ta-Si-O coatings were investigated to overcome the oxygen blocking limitations of traditionally self-derived porous ZrO<sub>2</sub> layer. The individual solid solution of Ta and Si into ZrO<sub>2</sub> lattice was respectively found trapped in the rapid phase precipitation and volatile loss, thus exhibiting insufficient ablation property. The as-designed Zr<sub>0.92</sub>Ta<sub>0.04</sub>Si<sub>0.04</sub>O<sub>2</sub> coating successfully acquired a near-zero linear recession rate (-0.10 μm/s) after 900 s cyclic ablation (2.4 MW/m<sup>2</sup>, 15 cycles). Key reasons can be attributed to a continuous sintering promotion and secondary phase precipitation limitation via large lattice distortion, where that of Zr<sub>7/8</sub>Ta<sub>1/16</sub>Si<sub>1/16</sub>O<sub>2</sub> lattice exhibits over 200 % increase than Zr<sub>7/8</sub>Ta<sub>1/8</sub>O<sub>2</sub> lattice.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112689"},"PeriodicalIF":7.4,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139731","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 : 2025-01-05DOI: 10.1016/j.corsci.2025.112688
Jie Yang , Zhengbin Wang , Qing Li , Zhixiang Xiao , Zhenyu Liu , Bolv Xiao , Zongyi Ma , Yugui Zheng
The effect of quenching rate on corrosion and mechanical properties of a novel Na2MoO4@CNT/Al-Zn-Mg-Cu composite is investigated. The results show that the corrosion resistance of this composite is not sensitive to quenching rate, maintaining a low corrosion rate of ∼0.01 mm/y in 0.6 mol/L NaCl solution and the highest resistance to intergranular and exfoliation corrosion. Besides, ultrahigh strength of this composite decreases but the elongation increases greatly with decreasing the quenching rate. The low quenching sensitivity to corrosion results from the formation of protective surface films promoted by surface enrichment of the MoO42- ions spontaneously released from exposed CNTs.
{"title":"Effect of quenching rate of solution treatment on corrosion resistance and mechanical properties of a novel Na2MoO4@CNT/Al-Zn-Mg-Cu composite","authors":"Jie Yang , Zhengbin Wang , Qing Li , Zhixiang Xiao , Zhenyu Liu , Bolv Xiao , Zongyi Ma , Yugui Zheng","doi":"10.1016/j.corsci.2025.112688","DOIUrl":"10.1016/j.corsci.2025.112688","url":null,"abstract":"<div><div>The effect of quenching rate on corrosion and mechanical properties of a novel Na<sub>2</sub>MoO<sub>4</sub>@CNT/Al-Zn-Mg-Cu composite is investigated. The results show that the corrosion resistance of this composite is not sensitive to quenching rate, maintaining a low corrosion rate of ∼0.01 mm/y in 0.6 mol/L NaCl solution and the highest resistance to intergranular and exfoliation corrosion. Besides, ultrahigh strength of this composite decreases but the elongation increases greatly with decreasing the quenching rate. The low quenching sensitivity to corrosion results from the formation of protective surface films promoted by surface enrichment of the MoO<sub>4</sub><sup>2-</sup> ions spontaneously released from exposed CNTs.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112688"},"PeriodicalIF":7.4,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139867","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}
The corrosion stability of magnesium alloys can be substantially enhanced through surface modification and coating techniques. However, the relationships between the substrate microstructural aspects and resulting electrodeposited coatings remains largely unexplored. To address this, the present study investigates the development of hydroxyapatite coatings with varying morphologies on thermally treated AZ91 Mg alloy substrates. Development of an intermediate Mg(OH)2 layer at the AZ91 substrate during immersion in the coating electrolyte, under the influence of the micro-galvanic corrosion of the secondary phases / α-matrix coupling in the AZ91 microstructure, plays a critical role in determining the final coating morphology. Notably, the coating exhibits a finer morphology when applied to substrates with finer, intragranular β-phase precipitates resulting from aging treatment. The corrosion rate of the uncoated casting alloy reduced by 22 % and 12 % after solution treatment and aging, respectively, due to reduced cracking in the corrosion layer and enhanced passivation as a result of CaCO3 formation. The solution-treated AZ91 substrate yielded a nearly defect-free, uniform hydroxyapatite coating with the lowest corrosion current, while the as-cast sample produced a hydroxyapatite coating with defects, particularly over the sites, leading to higher corrosion currents. The polarization resistance (Rp) of the initial as-cast alloy increased about 7-fold after solution treatment followed by hydroxyapatite coating. Overall, the and -phases in AZ91 alloy contribute to micro-galvanic corrosion by acting as cathodic sites, significantly influencing both the resistance of bare alloy to corrosion and the morphology and protective efficacy of the hydroxyapatite layer.
{"title":"Microstructural tuning of AZ91 magnesium alloy for improved morphology and corrosion protection of electrodeposited hydroxyapatite coatings","authors":"Fatemeh Zahra Akbarzadeh , Mohammad Rajabi , Roohollah Jamaati , Annabel Braem","doi":"10.1016/j.corsci.2025.112678","DOIUrl":"10.1016/j.corsci.2025.112678","url":null,"abstract":"<div><div>The corrosion stability of magnesium alloys can be substantially enhanced through surface modification and coating techniques. However, the relationships between the substrate microstructural aspects and resulting electrodeposited coatings remains largely unexplored. To address this, the present study investigates the development of hydroxyapatite coatings with varying morphologies on thermally treated AZ91 Mg alloy substrates. Development of an intermediate Mg(OH)<sub>2</sub> layer at the AZ91 substrate during immersion in the coating electrolyte, under the influence of the micro-galvanic corrosion of the secondary phases / α-matrix coupling in the AZ91 microstructure, plays a critical role in determining the final coating morphology. Notably, the coating exhibits a finer morphology when applied to substrates with finer, intragranular β-phase precipitates resulting from aging treatment. The corrosion rate of the uncoated casting alloy reduced by 22 % and 12 % after solution treatment and aging, respectively, due to reduced cracking in the corrosion layer and enhanced passivation as a result of CaCO<sub>3</sub> formation. The solution-treated AZ91 substrate yielded a nearly defect-free, uniform hydroxyapatite coating with the lowest corrosion current, while the as-cast sample produced a hydroxyapatite coating with defects, particularly over the <span><math><mrow><mi>α</mi><mo>+</mo><mi>β</mi></mrow></math></span> sites, leading to higher corrosion currents. The polarization resistance (Rp) of the initial as-cast alloy increased about 7-fold after solution treatment followed by hydroxyapatite coating. Overall, the <span><math><mrow><msub><mrow><mi>Al</mi></mrow><mrow><mn>8</mn></mrow></msub><mspace></mspace><msub><mrow><mi>Mn</mi></mrow><mrow><mn>5</mn></mrow></msub></mrow></math></span> and <span><math><mi>β</mi></math></span>-phases in AZ91 alloy contribute to micro-galvanic corrosion by acting as cathodic sites, significantly influencing both the resistance of bare alloy to corrosion and the morphology and protective efficacy of the hydroxyapatite layer.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112678"},"PeriodicalIF":7.4,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139869","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 : 2025-01-03DOI: 10.1016/j.corsci.2025.112680
Yuan-Pei Gong , Peng-Peng Wu , Shao-Hua Zhang , Yue-Zhong Zhang , Bao-Sheng Liu , Guang-Ling Song
In this work, conversion solutions with pH of 6.2–7.5 were prepared by a new method of bubbling CO2 into a saturated Ca(OH)2 solution to refine the calcium carbonate coating (CCC) on pure Mg and AZ91 alloy. Effects of solution condition and Mg substrate on CCC formation were studied. The CCC had the same constituent on varied substrates. In the pH 6.2 solution, the CCC consisted of aragonite. Increasing solution pH led to increased calcite content in CCC. The CCC grain-refinement occurred on the AZ91 owing to the micro-galvanic effect. Both phase constituent and grain size significantly influenced the CCC protectiveness.
{"title":"Refinement and protectiveness of the calcium carbonate coating on Mg substrates","authors":"Yuan-Pei Gong , Peng-Peng Wu , Shao-Hua Zhang , Yue-Zhong Zhang , Bao-Sheng Liu , Guang-Ling Song","doi":"10.1016/j.corsci.2025.112680","DOIUrl":"10.1016/j.corsci.2025.112680","url":null,"abstract":"<div><div>In this work, conversion solutions with pH of 6.2–7.5 were prepared by a new method of bubbling CO<sub>2</sub> into a saturated Ca(OH)<sub>2</sub> solution to refine the calcium carbonate coating (CCC) on pure Mg and AZ91 alloy. Effects of solution condition and Mg substrate on CCC formation were studied. The CCC had the same constituent on varied substrates. In the pH 6.2 solution, the CCC consisted of aragonite. Increasing solution pH led to increased calcite content in CCC. The CCC grain-refinement occurred on the AZ91 owing to the micro-galvanic effect. Both phase constituent and grain size significantly influenced the CCC protectiveness.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112680"},"PeriodicalIF":7.4,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139866","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 : 2025-01-03DOI: 10.1016/j.corsci.2025.112677
Xueying Wang , Hongyi Liu , Boyang Pan , Mingjiang Sun , Xiaolong Ma , Ziyue Zhang , Aihua Liu , Yan Li
In this study, Zn was introduced into degradable iron by ion implantation and functionalized surfaces with a three-layer gradient structure (Zn/Fe) were obtained. The accelerated corrosion mechanism for Zn/Fe based on microstructure evolution has been revealed. Nanoscale Zn was distributed uniformly and diffusely in the implanted layer, forming a large number of micro primary cells with the iron matrix. High-density dislocations and lattice distortions were introduced by high-energy ion beams beyond the implantation region. Due to a combination of non-equilibrium phase mixing and high-density defect structures, Zn/Fe exhibited accelerated corrosion behavior during 120 days of in vitro immersion experiments.
{"title":"In vitro corrosion behavior of zinc ion-implanted absorbable iron in Hank’s solution","authors":"Xueying Wang , Hongyi Liu , Boyang Pan , Mingjiang Sun , Xiaolong Ma , Ziyue Zhang , Aihua Liu , Yan Li","doi":"10.1016/j.corsci.2025.112677","DOIUrl":"10.1016/j.corsci.2025.112677","url":null,"abstract":"<div><div>In this study, Zn was introduced into degradable iron by ion implantation and functionalized surfaces with a three-layer gradient structure (Zn/Fe) were obtained. The accelerated corrosion mechanism for Zn/Fe based on microstructure evolution has been revealed. Nanoscale Zn was distributed uniformly and diffusely in the implanted layer, forming a large number of micro primary cells with the iron matrix. High-density dislocations and lattice distortions were introduced by high-energy ion beams beyond the implantation region. Due to a combination of non-equilibrium phase mixing and high-density defect structures, Zn/Fe exhibited accelerated corrosion behavior during 120 days of in vitro immersion experiments.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112677"},"PeriodicalIF":7.4,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139863","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 : 2025-01-03DOI: 10.1016/j.corsci.2025.112679
Tianrun Li , Debin Wang , Jingping Cui , Ning Li , Suode Zhang , Jianqiang Wang
This work thoroughly investigated the effects of the L12 size upon the corrosion behavior for L12-strengthened HEAs. Compared with the single-phase homogenized HEA, HEAs strengthened by small-sized L12 exhibited higher pitting potential (Epit). Nevertheless, with the L12 coarsening, Epit decreases markedly. The exceptional corrosion behavior for small-sized L12-strengthened HEAs was attributed to the rapid repassivation of the remaining FCC matrix after the complete dissolution of L12, forming the uniform and Cr-enriched films. The deteriorated corrosion resistance induced by the larger L12 was ascribed to heterogeneous films due to the incomplete dissolution of L12 and the reduced pitting growth resistance.
{"title":"Size-dependent pitting corrosion behavior for L12-strengthened high-entropy alloys","authors":"Tianrun Li , Debin Wang , Jingping Cui , Ning Li , Suode Zhang , Jianqiang Wang","doi":"10.1016/j.corsci.2025.112679","DOIUrl":"10.1016/j.corsci.2025.112679","url":null,"abstract":"<div><div>This work thoroughly investigated the effects of the L1<sub>2</sub> size upon the corrosion behavior for L1<sub>2</sub>-strengthened HEAs. Compared with the single-phase homogenized HEA, HEAs strengthened by small-sized L1<sub>2</sub> exhibited higher pitting potential (<em>E</em><sub>pit</sub>). Nevertheless, with the L1<sub>2</sub> coarsening, <em>E</em><sub>pit</sub> decreases markedly. The exceptional corrosion behavior for small-sized L1<sub>2</sub>-strengthened HEAs was attributed to the rapid repassivation of the remaining FCC matrix after the complete dissolution of L1<sub>2</sub>, forming the uniform and Cr-enriched films. The deteriorated corrosion resistance induced by the larger L1<sub>2</sub> was ascribed to heterogeneous films due to the incomplete dissolution of L1<sub>2</sub> and the reduced pitting growth resistance.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112679"},"PeriodicalIF":7.4,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139727","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 : 2025-01-02DOI: 10.1016/j.corsci.2025.112674
Yiwen Chen , Shuo Ma , Jiang Ju , Kai Chen , Jingya Wang , Zhao Shen , Xiaoqin Zeng
The oxidation behavior of an AlCrFeCoNi2.1 eutectic high-entropy alloy (EHEA) at 800 ℃ in air was meticulously examined. Under steady-state oxidation conditions, the oxide scale predominantly features a continuous and dense Al2O3 layer, interspersed with blocky Fe2O3 and Cr2O3 formations. Beneath the original surface, a single FCC matrix layer emerges due to a phase transition from BCC to FCC, driven by the extensive consumption of Al in the formation of Al2O3. This unique duplex-layer structure, comprising an Al2O3-based oxide scale and an Al-depleted FCC matrix layer, markedly enhances the oxidation performance of the alloy.
{"title":"Phase transformation-mediated high-temperature oxidation in an AlCrFeCoNi2.1 EHEA alloy at elevated temperature","authors":"Yiwen Chen , Shuo Ma , Jiang Ju , Kai Chen , Jingya Wang , Zhao Shen , Xiaoqin Zeng","doi":"10.1016/j.corsci.2025.112674","DOIUrl":"10.1016/j.corsci.2025.112674","url":null,"abstract":"<div><div>The oxidation behavior of an AlCrFeCoNi<sub>2.1</sub> eutectic high-entropy alloy (EHEA) at 800 ℃ in air was meticulously examined. Under steady-state oxidation conditions, the oxide scale predominantly features a continuous and dense Al<sub>2</sub>O<sub>3</sub> layer, interspersed with blocky Fe<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> formations. Beneath the original surface, a single FCC matrix layer emerges due to a phase transition from BCC to FCC, driven by the extensive consumption of Al in the formation of Al<sub>2</sub>O<sub>3</sub>. This unique duplex-layer structure, comprising an Al<sub>2</sub>O<sub>3</sub>-based oxide scale and an Al-depleted FCC matrix layer, markedly enhances the oxidation performance of the alloy.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112674"},"PeriodicalIF":7.4,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139872","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 : 2025-01-02DOI: 10.1016/j.corsci.2024.112672
Mingyi Guo , Liujie Xu , Yunchao Zhao , Shengqiang Deng , Zhou Li , Shizhong Wei
The oxidation behavior of MoNbVTa0.5Crx (x = 0.25–1) refractory high entropy alloys (RHEAs) at 800 ℃ was studied. The oxidation resistance of the alloy significantly increased with the increase of Cr content. Due to the formation of dense CrNbO4/CrTaO4 oxide layers, MoNbVTa0.5Cr alloy exhibited promising oxidation resistance, with a specific mass gain of 47.76 mg/cm2 after 36 h of oxidation in air at 1100 ℃. The oxidation kinetics of MoNbVTa0.5Cr alloy at 800–1100 ℃ conformed to parabolic kinetics, and the internal oxidation of alloys was mainly caused by the inward diffusion of oxygen. This study provides valuable reference for the development of antioxidant RHEAs.
{"title":"High temperature oxidation behavior and mechanism of MoNbVTa0.5Crx refractory high entropy alloys","authors":"Mingyi Guo , Liujie Xu , Yunchao Zhao , Shengqiang Deng , Zhou Li , Shizhong Wei","doi":"10.1016/j.corsci.2024.112672","DOIUrl":"10.1016/j.corsci.2024.112672","url":null,"abstract":"<div><div>The oxidation behavior of MoNbVTa<sub>0.5</sub>Cr<sub>x</sub> (x = 0.25–1) refractory high entropy alloys (RHEAs) at 800 ℃ was studied. The oxidation resistance of the alloy significantly increased with the increase of Cr content. Due to the formation of dense CrNbO<sub>4</sub>/CrTaO<sub>4</sub> oxide layers, MoNbVTa<sub>0.5</sub>Cr alloy exhibited promising oxidation resistance, with a specific mass gain of 47.76 mg/cm<sup>2</sup> after 36 h of oxidation in air at 1100 ℃. The oxidation kinetics of MoNbVTa<sub>0.5</sub>Cr alloy at 800–1100 ℃ conformed to parabolic kinetics, and the internal oxidation of alloys was mainly caused by the inward diffusion of oxygen. This study provides valuable reference for the development of antioxidant RHEAs.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112672"},"PeriodicalIF":7.4,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139651","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 : 2025-01-02DOI: 10.1016/j.corsci.2024.112671
Decang Zhang , Xiaoxin Zhang , Yong Guo , Jun Zhang , Hao Ren , Xian Zeng , Qingzhi Yan
The oxidation behavior of AFA steel was examined after exposure to LBE with 10−8, 10−6, and 10−3 wt.% oxygen at 600°C for 500 h. At 10−8 wt.% oxygen, a 50–200 nm oxide scale was formed with a discontinuous Cr2O3 and a compact Al2O3 layers, accompanied by nano-cavities in the substrate. At 10−6 wt.% oxygen, the Cr2O3 layer became continuous, nano-cavities disappeared, and the oxide scale thickness reduced to 50–100 nm. At 10−3 wt.% oxygen, a defective three-layered oxide scale formed, reaching a thickness of 3–5 μm. Additionally, a subsurface phase transformation layer was developed, characterized by associated NiAl/Ni3Al and M23C6.
{"title":"High-resolution characterization revealing the effect of dissolved oxygen in lead-bismuth eutectic (LBE) on oxide scale and subsurface phase transformation layer in alumina-forming austenitic (AFA) steel","authors":"Decang Zhang , Xiaoxin Zhang , Yong Guo , Jun Zhang , Hao Ren , Xian Zeng , Qingzhi Yan","doi":"10.1016/j.corsci.2024.112671","DOIUrl":"10.1016/j.corsci.2024.112671","url":null,"abstract":"<div><div>The oxidation behavior of AFA steel was examined after exposure to LBE with 10<sup>−8</sup>, 10<sup>−6</sup>, and 10<sup>−3</sup> wt.% oxygen at 600°C for 500 h. At 10<sup>−8</sup> wt.% oxygen, a 50–200 nm oxide scale was formed with a discontinuous Cr<sub>2</sub>O<sub>3</sub> and a compact Al<sub>2</sub>O<sub>3</sub> layers, accompanied by nano-cavities in the substrate. At 10<sup>−6</sup> wt.% oxygen, the Cr<sub>2</sub>O<sub>3</sub> layer became continuous, nano-cavities disappeared, and the oxide scale thickness reduced to 50–100 nm. At 10<sup>−3</sup> wt.% oxygen, a defective three-layered oxide scale formed, reaching a thickness of 3–5 μm. Additionally, a subsurface phase transformation layer was developed, characterized by associated NiAl/Ni<sub>3</sub>Al and M<sub>23</sub>C<sub>6</sub>.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"245 ","pages":"Article 112671"},"PeriodicalIF":7.4,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143139870","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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