Pub Date : 2025-03-18DOI: 10.1016/j.corsci.2025.112873
C. Hong, S.L. Lu, Y.G. Zhao, Z.H. Li, Y.H. Lu
Effects of temperature on ratchetting behavior and cracking mechanism of 316LN stainless steel in different temperature pressured water environments were studied. The results indicated that there was a threshold for the influence of water temperature on ratchetting life. When water temperature was lower than 100 ℃, the water temperature had little effect on ratchetting life, the ratchetting cracking mechanism was dominated by cyclic hardening. When water temperature was increased to 100 ℃ - 325 ℃, the slip-dissolution mechanism dominated the ratchetting cracking, and the ratchetting life was a power function relationship with water temperature, i.e., N = Nair(T/100)−0.183.
{"title":"Effects of temperature on ratchetting behavior and cracking mechanism of 316LN stainless steel in different temperature pressured water environments","authors":"C. Hong, S.L. Lu, Y.G. Zhao, Z.H. Li, Y.H. Lu","doi":"10.1016/j.corsci.2025.112873","DOIUrl":"10.1016/j.corsci.2025.112873","url":null,"abstract":"<div><div>Effects of temperature on ratchetting behavior and cracking mechanism of 316LN stainless steel in different temperature pressured water environments were studied. The results indicated that there was a threshold for the influence of water temperature on ratchetting life. When water temperature was lower than 100 ℃, the water temperature had little effect on ratchetting life, the ratchetting cracking mechanism was dominated by cyclic hardening. When water temperature was increased to 100 ℃ - 325 ℃, the slip-dissolution mechanism dominated the ratchetting cracking, and the ratchetting life was a power function relationship with water temperature, i.e., N = N<sub>air</sub>(T/100)<sup>−0.183</sup>.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112873"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643964","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 : 2025-03-14DOI: 10.1016/j.corsci.2025.112867
Liang Lv , Jingxuan Zhuo , Yifan Du, Kai Chen, Guiming Dang, Haoyun Xu, Haoran Gao, Yongxiang Guo, Shuqi Zheng
Currently, pipeline transportation is the most economical and safe method for transporting natural gas. X65 is one of the most commonly used steel grades for offshore oil and gas pipelines. While transporting of high-pressure hydrogen is efficient and economical, harsh natural environments, such as the continuous seawater fluctuation, can cause cyclic loading on the pipeline. Therefore, the effect of hydrogen and fatigue loading on X65 pipeline steel cannot be ignored. This study aims to explore the effects of hydrogen and air environments on crack initiation and propagation. Initially, tests on fatigue life and crack growth rate are performed in H2, in addition, scanning electron microscopy and electron backscatter diffraction analyses are conducted on the specimens. Results, indicate that crack initiation is influenced by the microstructure of X65 pipeline steel with inclusions acting as the source of crack initiation, and pearlite affecting the trend of crack propagation. Hydrogen exposure decreases the fatigue life in comparison with that in air by 85.5 % and increases the crack growth rate in comparison with that in air by approximately 20 times. In the air environment the distance between the stress-concentration region and the crack tip is almost equal to the size of two grains. In H2, the cracks deflect because of the rapid growth, and the deflected cracks divide the stress concentration area. This study provides insights into the effects of hydrogen and microstructure on the fatigue properties of X65 pipeline steel, offering a theoretical basis for future studies under different conditions.
{"title":"The effects of hydrogen and microstructure on crack initiation and propagation of X65 pipeline steel","authors":"Liang Lv , Jingxuan Zhuo , Yifan Du, Kai Chen, Guiming Dang, Haoyun Xu, Haoran Gao, Yongxiang Guo, Shuqi Zheng","doi":"10.1016/j.corsci.2025.112867","DOIUrl":"10.1016/j.corsci.2025.112867","url":null,"abstract":"<div><div>Currently, pipeline transportation is the most economical and safe method for transporting natural gas. X65 is one of the most commonly used steel grades for offshore oil and gas pipelines. While transporting of high-pressure hydrogen is efficient and economical, harsh natural environments, such as the continuous seawater fluctuation, can cause cyclic loading on the pipeline. Therefore, the effect of hydrogen and fatigue loading on X65 pipeline steel cannot be ignored. This study aims to explore the effects of hydrogen and air environments on crack initiation and propagation. Initially, tests on fatigue life and crack growth rate are performed in H<sub>2</sub>, in addition, scanning electron microscopy and electron backscatter diffraction analyses are conducted on the specimens. Results, indicate that crack initiation is influenced by the microstructure of X65 pipeline steel with inclusions acting as the source of crack initiation, and pearlite affecting the trend of crack propagation. Hydrogen exposure decreases the fatigue life in comparison with that in air by 85.5 % and increases the crack growth rate in comparison with that in air by approximately 20 times. In the air environment the distance between the stress-concentration region and the crack tip is almost equal to the size of two grains. In H<sub>2</sub>, the cracks deflect because of the rapid growth, and the deflected cracks divide the stress concentration area. This study provides insights into the effects of hydrogen and microstructure on the fatigue properties of X65 pipeline steel, offering a theoretical basis for future studies under different conditions.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112867"},"PeriodicalIF":7.4,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632004","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 : 2025-03-13DOI: 10.1016/j.corsci.2025.112865
Haiyan Li, Huan Liu, Jianquan Li, Hong Yao
Corrosion resistance and mechanism of Inconel625 at 500–700 °C in high-parameter waste incinerators were investigated. In the deposit-corrosion condition, Cr/Mo in the coating would be dissolved, producing soluble products such as Na2CrO4/Na2MoO4. At 600/700°C, the risk of Cr loss in the form of CrO42- was increased from ∼30 % to ∼70 %. While in coupling corrosion environment (with HCl/SO2), chlorides of Ni/Fe were dominant in the soluble corrosion products due to the high partial pressure of Cl2. Though the corrosion rate was significantly accelerated during coupling corrosion, Inconel625 could form protective bilayer oxides and maintain its corrosion resistance in both conditions.
{"title":"High-temperature corrosion resistance of weld overlay In625 coating in aggressive environments of waste incinerators","authors":"Haiyan Li, Huan Liu, Jianquan Li, Hong Yao","doi":"10.1016/j.corsci.2025.112865","DOIUrl":"10.1016/j.corsci.2025.112865","url":null,"abstract":"<div><div>Corrosion resistance and mechanism of Inconel625 at 500–700 °C in high-parameter waste incinerators were investigated. In the deposit-corrosion condition, Cr/Mo in the coating would be dissolved, producing soluble products such as Na<sub>2</sub>CrO<sub>4</sub>/Na<sub>2</sub>MoO<sub>4</sub>. At 600/700°C, the risk of Cr loss in the form of CrO<sub>4</sub><sup>2-</sup> was increased from ∼30 % to ∼70 %. While in coupling corrosion environment (with HCl/SO<sub>2</sub>), chlorides of Ni/Fe were dominant in the soluble corrosion products due to the high partial pressure of Cl<sub>2</sub>. Though the corrosion rate was significantly accelerated during coupling corrosion, Inconel625 could form protective bilayer oxides and maintain its corrosion resistance in both conditions.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112865"},"PeriodicalIF":7.4,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632003","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 : 2025-03-13DOI: 10.1016/j.corsci.2025.112866
Rui Zhong , Jingxiao Zhao , Zhenjia Xie , Peng Han , Hua Wang , Jingliang Wang , Chengjia Shang
The present study examines the impact of different types of boundaries on hydrogen embrittlement in a bainitic steel. Different grain boundary distributions were obtained by austenitizing the steel at 1050°C and 950°C, respectively. The decrease in austenitization temperature refines the prior austenite grain, and leads to a higher density of prior austenite grain boundaries (PAGBs) and high-angle packet boundaries (HAPBs), while showing a lower density of block boundaries (BBs). PAGBs and HAPBs, due to their high overall misorientation angle (OMA), possess strong hydrogen-trapping capabilities. Owing to the high specific misorientation angles between {110} slip planes ({110}-SMA) of the adjacent sub-volumes, these boundaries significantly impede the movement of dislocation carrying hydrogen atoms, thereby facilitating the hydrogen enrichment at these boundaries. As a result, a higher density of PAGBs and HAPBs means a reduced hydrogen concentration per unit boundary area, which leads to a decreased susceptibility to hydrogen embrittlement. On the other hand, BBs exhibit high OMA but low {110}-SMA. Therefore, they do not impede dislocation movement significantly. Meanwhile, the majority of BBs are Σ3 boundaries, which have weak hydrogen-trapping capacity and serve as rapid diffusion channels for hydrogen. As a result, hydrogen atoms do not accumulate at Σ3 boundaries but rather accumulate at other boundaries in their vicinity. This work provides a new insight into the effect of different types of grain boundaries on hydrogen diffusion and hydrogen trapping efficacy and offers an approach for grain boundary design to alleviate hydrogen embrittlement in bainitic/martensitic steels.
{"title":"New insights from crystallography into the effect of boundaries on hydrogen embrittlement susceptibility of a 1000 MPa grade heavy gauge high-strength low-alloy steel","authors":"Rui Zhong , Jingxiao Zhao , Zhenjia Xie , Peng Han , Hua Wang , Jingliang Wang , Chengjia Shang","doi":"10.1016/j.corsci.2025.112866","DOIUrl":"10.1016/j.corsci.2025.112866","url":null,"abstract":"<div><div>The present study examines the impact of different types of boundaries on hydrogen embrittlement in a bainitic steel. Different grain boundary distributions were obtained by austenitizing the steel at 1050°C and 950°C, respectively. The decrease in austenitization temperature refines the prior austenite grain, and leads to a higher density of prior austenite grain boundaries (PAGBs) and high-angle packet boundaries (HAPBs), while showing a lower density of block boundaries (BBs). PAGBs and HAPBs, due to their high overall misorientation angle (OMA), possess strong hydrogen-trapping capabilities. Owing to the high specific misorientation angles between {110} slip planes ({110}-SMA) of the adjacent sub-volumes, these boundaries significantly impede the movement of dislocation carrying hydrogen atoms, thereby facilitating the hydrogen enrichment at these boundaries. As a result, a higher density of PAGBs and HAPBs means a reduced hydrogen concentration per unit boundary area, which leads to a decreased susceptibility to hydrogen embrittlement. On the other hand, BBs exhibit high OMA but low {110}-SMA. Therefore, they do not impede dislocation movement significantly. Meanwhile, the majority of BBs are Σ3 boundaries, which have weak hydrogen-trapping capacity and serve as rapid diffusion channels for hydrogen. As a result, hydrogen atoms do not accumulate at Σ3 boundaries but rather accumulate at other boundaries in their vicinity. This work provides a new insight into the effect of different types of grain boundaries on hydrogen diffusion and hydrogen trapping efficacy and offers an approach for grain boundary design to alleviate hydrogen embrittlement in bainitic/martensitic steels.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112866"},"PeriodicalIF":7.4,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628323","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 : 2025-03-12DOI: 10.1016/j.corsci.2025.112844
Emad H. Bartawi , Ghada Shaban , Calin D. Marioara , Ehsan Rahimi , Ruben Bjørge , Jonas K. Sunde , Yaiza Gonzalez-Garcia , Randi Holmestad , Rajan Ambat
Recycling Al alloys promotes greater sustainability, as the energy required to produce recycled alloys is only about 5 % of that needed to produce the same amount of primary alloys. However, the build-up of impurities, such as Zn, during the recycling process can negatively affect the corrosion resistance of recycled alloys. The results show that the susceptibility to intergranular corrosion increased with minor additions of zinc (≤ 0.06 wt%). Zn was found to segregate along the grain boundaries, and the STEM-EDS results indicate that the Zn incorporates into the structure of Mg-Si containing grain boundary precipitates.
{"title":"Effect of minor addition of Zn on precipitate crystal structures and intergranular corrosion in 6082 Al-Mg-Si alloys","authors":"Emad H. Bartawi , Ghada Shaban , Calin D. Marioara , Ehsan Rahimi , Ruben Bjørge , Jonas K. Sunde , Yaiza Gonzalez-Garcia , Randi Holmestad , Rajan Ambat","doi":"10.1016/j.corsci.2025.112844","DOIUrl":"10.1016/j.corsci.2025.112844","url":null,"abstract":"<div><div>Recycling Al alloys promotes greater sustainability, as the energy required to produce recycled alloys is only about 5 % of that needed to produce the same amount of primary alloys. However, the build-up of impurities, such as Zn, during the recycling process can negatively affect the corrosion resistance of recycled alloys. The results show that the susceptibility to intergranular corrosion increased with minor additions of zinc (≤ 0.06 wt%). Zn was found to segregate along the grain boundaries, and the STEM-EDS results indicate that the Zn incorporates into the structure of Mg-Si containing grain boundary precipitates.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112844"},"PeriodicalIF":7.4,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628322","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 : 2025-03-12DOI: 10.1016/j.corsci.2025.112860
Martin Otto , Thomas Hultsch , Viktoriia Shtefan , Volker Hoffmann , Sviatlana V. Lamaka , Thomas Gemming , Annett Gebert , Jochen Fröhlich , Mikhail L. Zheludkevich , Julia Hufenbach
The in vitro corrosion of Fe-30Mn-1C in a Ca-modified Hanks’ balanced salt solution was investigated for biodegradable cardiovascular stents with a rotating disc electrode. A blood flow-related approach was developed to adjust laminar flow conditions. Electrochemical monitoring revealed that intermediate flow caused maximum corrosion, while static and high flow conditions led to minimal corrosion. Surface analysis indicated the formation of a non-crystalline, nanoscopic degradation layer, whereby thickness, porosity and layer-disrupting defects are strongly affected by flow conditions. The interplay between laminar flow and the degradation layer was crucial for the steel degradation and discussed by employing a hydrodynamics-based corrosion scheme.
{"title":"Mechanisms of laminar flow controlled in vitro corrosion of a biodegradable Fe-Mn-C steel","authors":"Martin Otto , Thomas Hultsch , Viktoriia Shtefan , Volker Hoffmann , Sviatlana V. Lamaka , Thomas Gemming , Annett Gebert , Jochen Fröhlich , Mikhail L. Zheludkevich , Julia Hufenbach","doi":"10.1016/j.corsci.2025.112860","DOIUrl":"10.1016/j.corsci.2025.112860","url":null,"abstract":"<div><div>The <em>in vitro</em> corrosion of Fe-30Mn-1C in a Ca-modified Hanks’ balanced salt solution was investigated for biodegradable cardiovascular stents with a rotating disc electrode. A blood flow-related approach was developed to adjust laminar flow conditions. Electrochemical monitoring revealed that intermediate flow caused maximum corrosion, while static and high flow conditions led to minimal corrosion. Surface analysis indicated the formation of a non-crystalline, nanoscopic degradation layer, whereby thickness, porosity and layer-disrupting defects are strongly affected by flow conditions. The interplay between laminar flow and the degradation layer was crucial for the steel degradation and discussed by employing a hydrodynamics-based corrosion scheme.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112860"},"PeriodicalIF":7.4,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643966","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 : 2025-03-11DOI: 10.1016/j.corsci.2025.112862
Ping Huang , Debin Wang , Jingping Cui , Jiaqi Liu , Suode Zhang , Yinglei Ren , Keqiang Qiu , Jianqiang Wang
The corrosion resistance of Fe-based metallic glasses (MGs) with different Cr/Mo ratios in simulated wet storage environment for spent nuclear fuels were systematically examined. Results reveal that the Cr/Mo ratio exhibits different effects on the corrosion resistance of the Fe-based MGs at different potentials. At low potential, the passive current density decreases gradually with the increment of Cr/Mo ratio. This is related to the enrichment of Cr oxides and the reduction of defects densities in the passive film, which inhibit the diffusion of Cl− and the dissolution of the film. Interestingly, at high potential, as the Cr/Mo ratio increases, the corrosion property of the Fe-based MGs enhances initially and then deteriorates, and Cr10Mo5 alloy demonstrates the best corrosion resistance. This is because at the appropriate Cr/Mo ratio, the potential can encourage the accumulation of Mo in passive films while also promote film thickening. This process enhances the electronic work function of the passive film, which contributes to the improved corrosion resistance. This research provides a new perspective for the designing corrosion-resistant Fe-based MGs for the wet storage of spent nuclear fuels.
{"title":"Potential-dependent Cr/Mo ratio effect on the passivity of Fe-based metallic glass in simulated wet storage environment of spent nuclear fuels","authors":"Ping Huang , Debin Wang , Jingping Cui , Jiaqi Liu , Suode Zhang , Yinglei Ren , Keqiang Qiu , Jianqiang Wang","doi":"10.1016/j.corsci.2025.112862","DOIUrl":"10.1016/j.corsci.2025.112862","url":null,"abstract":"<div><div>The corrosion resistance of Fe-based metallic glasses (MGs) with different Cr/Mo ratios in simulated wet storage environment for spent nuclear fuels were systematically examined. Results reveal that the Cr/Mo ratio exhibits different effects on the corrosion resistance of the Fe-based MGs at different potentials. At low potential, the passive current density decreases gradually with the increment of Cr/Mo ratio. This is related to the enrichment of Cr oxides and the reduction of defects densities in the passive film, which inhibit the diffusion of Cl<sup>−</sup> and the dissolution of the film. Interestingly, at high potential, as the Cr/Mo ratio increases, the corrosion property of the Fe-based MGs enhances initially and then deteriorates, and Cr<sub>10</sub>Mo<sub>5</sub> alloy demonstrates the best corrosion resistance. This is because at the appropriate Cr/Mo ratio, the potential can encourage the accumulation of Mo in passive films while also promote film thickening. This process enhances the electronic work function of the passive film, which contributes to the improved corrosion resistance. This research provides a new perspective for the designing corrosion-resistant Fe-based MGs for the wet storage of spent nuclear fuels.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112862"},"PeriodicalIF":7.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620513","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 : 2025-03-11DOI: 10.1016/j.corsci.2025.112852
Peng-Chong Lu , Hao Feng , Hua-Bing Li , Ming-Hong Ling , Hai-Jian Wang , Hong-Chun Zhu , Shu-Cai Zhang , Zhuo-Wen Ni , Zhong-Qiu Liu , Zhou-Hua Jiang
Through electrochemical and mechanical tests, microstructural characterization and thermodynamic assessment, this work demonstrated that magnesium (Mg) treatment enhanced the mechanical properties of high-nitrogen martensitic stainless steel (HNMSS), while reduced its corrosion resistance due to the coupling effects of anodic dissolution and chemical dissolution of MgO, MgS and their composite inclusions. Subsequently, Mg&Ce composite treatment was proposed to comprehensively enhance the corrosion resistance and mechanical properties of HNMSS. After Mg&Ce treatment, the inclusions were modified to Ce2O2S, CeN and Mg3N2, which all exhibited tendency of chemical dissolution. However, the formation of ammonium following the slight dissolution of CeN and Mg3N2 could inhibit the propagation of localized corrosion. Eventually, the advantages of Mg&Ce treatment were discussed, establishing an effective method for producing high-cleanliness and high-performance HNMSS.
{"title":"A strategy to overcome the negative effect of Mg treatment on localized corrosion and enhance the performance of high-nitrogen martensitic stainless steel by Mg&Ce composite treatment","authors":"Peng-Chong Lu , Hao Feng , Hua-Bing Li , Ming-Hong Ling , Hai-Jian Wang , Hong-Chun Zhu , Shu-Cai Zhang , Zhuo-Wen Ni , Zhong-Qiu Liu , Zhou-Hua Jiang","doi":"10.1016/j.corsci.2025.112852","DOIUrl":"10.1016/j.corsci.2025.112852","url":null,"abstract":"<div><div>Through electrochemical and mechanical tests, microstructural characterization and thermodynamic assessment, this work demonstrated that magnesium (Mg) treatment enhanced the mechanical properties of high-nitrogen martensitic stainless steel (HNMSS), while reduced its corrosion resistance due to the coupling effects of anodic dissolution and chemical dissolution of MgO, MgS and their composite inclusions. Subsequently, Mg&Ce composite treatment was proposed to comprehensively enhance the corrosion resistance and mechanical properties of HNMSS. After Mg&Ce treatment, the inclusions were modified to Ce<sub>2</sub>O<sub>2</sub>S, CeN and Mg<sub>3</sub>N<sub>2</sub>, which all exhibited tendency of chemical dissolution. However, the formation of ammonium following the slight dissolution of CeN and Mg<sub>3</sub>N<sub>2</sub> could inhibit the propagation of localized corrosion. Eventually, the advantages of Mg&Ce treatment were discussed, establishing an effective method for producing high-cleanliness and high-performance HNMSS.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112852"},"PeriodicalIF":7.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628417","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 : 2025-03-11DOI: 10.1016/j.corsci.2025.112863
Weiping Zhang , Yanqiang Qiao , Xiping Guo , Longfei Li , Xi Nan
A dense and well-bonded MoSi2/(Nb,X)Si2 composite coating was developed on Nb-Si based alloy by the combination of Si pack cementation with pre-oxidation and then Mo-Si slurry sintering. The formation of a SiO2 scale with proper thickness by pre-oxidation on (Nb,X)Si2 layer, can significantly improve the interface bonding between MoSi2 layer and (Nb,X)Si2 layer, as well as the compactness of MoSi2 layer. The MoSi2/(Nb,X)Si2 composite coating exhibits excellent oxidation resistance at 1250 ℃ and 1350 ℃, which can be attributed to the dense structure of MoSi2 layer, the sufficient Si source from (Nb,X)Si2 layer and the good interfacial bonding.
{"title":"Excellent oxidation resistance: A dense and well-bonded MoSi2/(Nb,X)Si2 composite coating on Nb-Si based alloy","authors":"Weiping Zhang , Yanqiang Qiao , Xiping Guo , Longfei Li , Xi Nan","doi":"10.1016/j.corsci.2025.112863","DOIUrl":"10.1016/j.corsci.2025.112863","url":null,"abstract":"<div><div>A dense and well-bonded MoSi<sub>2</sub>/(Nb,X)Si<sub>2</sub> composite coating was developed on Nb-Si based alloy by the combination of Si pack cementation with pre-oxidation and then Mo-Si slurry sintering. The formation of a SiO<sub>2</sub> scale with proper thickness by pre-oxidation on (Nb,X)Si<sub>2</sub> layer, can significantly improve the interface bonding between MoSi<sub>2</sub> layer and (Nb,X)Si<sub>2</sub> layer, as well as the compactness of MoSi<sub>2</sub> layer. The MoSi<sub>2</sub>/(Nb,X)Si<sub>2</sub> composite coating exhibits excellent oxidation resistance at 1250 ℃ and 1350 ℃, which can be attributed to the dense structure of MoSi<sub>2</sub> layer, the sufficient Si source from (Nb,X)Si<sub>2</sub> layer and the good interfacial bonding.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112863"},"PeriodicalIF":7.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620510","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 : 2025-03-11DOI: 10.1016/j.corsci.2025.112849
Sumit Kumar , Srinivasan Swaminathan , Rene Hesse , Hennig Goldbeck , Wenjin Ding , Alexander Bonk , Thomas Bauer
Solar Salt (60 wt% NaNO3,40 wt% KNO3), used in Concentrated Solar Power (CSP) Thermal Energy Storage (TES) technology, can decompose into various products at elevated temperatures, with oxide ions being one of the known corrosive byproducts. The study mimics Solar Salt aging by intentionally adding sodium peroxide (Na2O2) and sodium oxide (Na2O) at concentrations of 0.005–0.33 wt% to investigate their role in the corrosion of austenitic stainless steel at 600°C in typical operating conditions. Salt chemistry (nitrite, nitrate, oxide ions, and metal cations) was analyzed every 24 h, and steel corrosion after 168 h was assessed by weight change, corrosion rate, phase analysis, and cross-sectional morphology. Results reveal that at or above 0.135 wt% added Na2O2/Na2O leads to a quasi-steady-state equilibrium of oxide ions in the salt. Interestingly, at these concentrations, the presence of steel further decreases oxide ion concentration. Furthermore, above 0.135 wt%, the corrosion rate increases significantly, along with increased spallation, porosity and disintegration of the corrosion layer, forming a non-protective layer. This study highlights the critical role of oxide ions in the corrosion process.
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