Pub Date : 2025-03-04DOI: 10.1016/j.corsci.2025.112846
Masashi Nishimoto , Jan Philipp Kollender , Izumi Muto , Achim Walter Hassel
The dissolution of Fe-15Cr alloy during potentiodynamic polarization in sulfuric acid was quantified in situ using inductively coupled plasma mass spectrometry. The potential dependence of the very low dissolution rates of Fe and Cr in the passive state was characterized. The selective dissolution of Fe was observed in the lower passive potential range, while Cr dissolved preferentially in the higher passive potential range. The discrepancy between the polarization curve and current from the Fe and Cr dissolution in the passive state was attributed to the formation of a passive film. The calculated film thickness was on the order of nanometers.
{"title":"In situ ICP-MS analysis of passivation process and selective dissolution of Fe-15Cr alloy in sulfuric acid","authors":"Masashi Nishimoto , Jan Philipp Kollender , Izumi Muto , Achim Walter Hassel","doi":"10.1016/j.corsci.2025.112846","DOIUrl":"10.1016/j.corsci.2025.112846","url":null,"abstract":"<div><div>The dissolution of Fe-15Cr alloy during potentiodynamic polarization in sulfuric acid was quantified in situ using inductively coupled plasma mass spectrometry. The potential dependence of the very low dissolution rates of Fe and Cr in the passive state was characterized. The selective dissolution of Fe was observed in the lower passive potential range, while Cr dissolved preferentially in the higher passive potential range. The discrepancy between the polarization curve and current from the Fe and Cr dissolution in the passive state was attributed to the formation of a passive film. The calculated film thickness was on the order of nanometers.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112846"},"PeriodicalIF":7.4,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551105","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}
Stability of electrochemical hydrogen charging to iron during potentiostatic polarization in a 3 wt% NaCl aqueous solution containing NH4SCN was investigated using electrochemical hydrogen permeation tests. The hydrogen absorption rate remained stable when the specimen was polarized at potentials of −0.9 V (vs. Ag/AgCl (3.33 M KCl)), −1.1 V, or −1.3 V. However, at polarization potential of −1.6 V, the hydrogen absorption rate fluctuated considerably over time. This fluctuation was attributed to changes in solution chemistry, where the proton concentration increased and the SCN– concentration decreased because of the oxidation reaction of SCN– on the Pt counter electrode.
{"title":"Stability of electrochemical hydrogen charging in NaCl aqueous solution containing NH4SCN: Effect of changes in solution chemistry","authors":"Saya Ajito, Yusuke Kabasawa, Hiroshi Kakinuma, Motomichi Koyama, Eiji Akiyama","doi":"10.1016/j.corsci.2025.112843","DOIUrl":"10.1016/j.corsci.2025.112843","url":null,"abstract":"<div><div>Stability of electrochemical hydrogen charging to iron during potentiostatic polarization in a 3 wt% NaCl aqueous solution containing NH<sub>4</sub>SCN was investigated using electrochemical hydrogen permeation tests. The hydrogen absorption rate remained stable when the specimen was polarized at potentials of −0.9 V (vs. Ag/AgCl (3.33 M KCl)), −1.1 V, or −1.3 V. However, at polarization potential of −1.6 V, the hydrogen absorption rate fluctuated considerably over time. This fluctuation was attributed to changes in solution chemistry, where the proton concentration increased and the SCN<sup>–</sup> concentration decreased because of the oxidation reaction of SCN<sup>–</sup> on the Pt counter electrode.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112843"},"PeriodicalIF":7.4,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551106","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 : 2025-03-01DOI: 10.1016/j.corsci.2025.112840
Wenyao Li , Jin Zhou , Jun Zhang , Hao Ren , Xingyuan Mei , Lining Xu , Feifei Zhang , Xiaoxin Zhang , Qingzhi Yan , Yang He , Lijie Qiao
With the increasing operating temperatures in fast neutron nuclear reactor designs, the incorporation of Cr, Si, and rare earth elements into the ferrite/martensite (F/M) steels has become common practice to bolster high-temperature mechanical properties and corrosion resistance. Nonetheless, weld joints often emerge as critical positions limiting the steel service life. Research on the service performances of weld joints in novel F/M steels enriched with Cr, Si, and especially rare earth elements remains lacking. Here, by studying a rare earth F/M steel and its weld joints, we systematically evaluated the corrosion resistance and degradation mechanism of laser-weld joints of the steels in liquid lead-bismuth eutectic alloy. Atomic-scale structural and chemical characterizations revealed that the welding process leads to a loss of solute Y and hence hinders the formation of the crucial Cr2O3-rich anti-oxidation layer. Without the protection, oxygen diffusion zone develops in the coarse columnar crystals in the weldment, which further undermines the density of the oxide scale. These findings provide critical fundamental information with insights for enhancing the service performance of weldments in advanced F/M steels.
{"title":"Corrosion behavior and mechanisms of rare-earth ferrite/martensite steel weldment in liquid lead-bismuth eutectic","authors":"Wenyao Li , Jin Zhou , Jun Zhang , Hao Ren , Xingyuan Mei , Lining Xu , Feifei Zhang , Xiaoxin Zhang , Qingzhi Yan , Yang He , Lijie Qiao","doi":"10.1016/j.corsci.2025.112840","DOIUrl":"10.1016/j.corsci.2025.112840","url":null,"abstract":"<div><div>With the increasing operating temperatures in fast neutron nuclear reactor designs, the incorporation of Cr, Si, and rare earth elements into the ferrite/martensite (F/M) steels has become common practice to bolster high-temperature mechanical properties and corrosion resistance. Nonetheless, weld joints often emerge as critical positions limiting the steel service life. Research on the service performances of weld joints in novel F/M steels enriched with Cr, Si, and especially rare earth elements remains lacking. Here, by studying a rare earth F/M steel and its weld joints, we systematically evaluated the corrosion resistance and degradation mechanism of laser-weld joints of the steels in liquid lead-bismuth eutectic alloy. Atomic-scale structural and chemical characterizations revealed that the welding process leads to a loss of solute Y and hence hinders the formation of the crucial Cr<sub>2</sub>O<sub>3</sub>-rich anti-oxidation layer. Without the protection, oxygen diffusion zone develops in the coarse columnar crystals in the weldment, which further undermines the density of the oxide scale. These findings provide critical fundamental information with insights for enhancing the service performance of weldments in advanced F/M steels.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112840"},"PeriodicalIF":7.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551109","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 : 2025-03-01DOI: 10.1016/j.corsci.2025.112839
Cuiwei Liu , Quer Chen , Cailin Wang , Mengze Zhu , Peixun Yang , Yuxing Li
Pipeline defects can significantly affect the hydrogen embrittlement behavior of materials during the transportation of hydrogen-blended natural gas through in-service pipelines. This study introduces an inner notched specimen that more accurately simulates wall thickness reduction at defect sites. The impact of the notch on the material’s mechanical properties was assessed through slow strain rate tensile tests. The hydrogen diffusion process was also analyzed using gaseous hydrogen permeation tests, which quantified changes in hydrogen flux due to the presence of the notch. Furthermore, microstructural characterization near the notch was performed using Electron Backscatter Diffraction (EBSD) to investigate the causes of the observed differences in test results induced by the defect. The findings indicate that susceptibility to hydrogen embrittlement at standard notches was lower than at inner notches with the same relative depth. Consequently, the critical safe hydrogen blending ratio determined from the standard notch may be conservative and should be reconsidered alongside results from the inner notch in practical applications. Notches positioned on the hydrogen-contacting side of the specimen increased the contact area between hydrogen and the metal surface, facilitating the dissociative adsorption of hydrogen molecules. This enhanced hydrogen adsorption and its subsequent penetration into the steel surface. In contrast, outer notches provided a different diffusion path for hydrogen atoms, with a greater decay in hydrogen concentration along the diffusion direction compared to smooth specimens. This led to fewer hydrogen atoms accumulating at the notch on the hydrogen-measuring side.
{"title":"Study on the hydrogen compatibility and hydrogen diffusion behavior of X42 steel with notch under gaseous hydrogen environment","authors":"Cuiwei Liu , Quer Chen , Cailin Wang , Mengze Zhu , Peixun Yang , Yuxing Li","doi":"10.1016/j.corsci.2025.112839","DOIUrl":"10.1016/j.corsci.2025.112839","url":null,"abstract":"<div><div>Pipeline defects can significantly affect the hydrogen embrittlement behavior of materials during the transportation of hydrogen-blended natural gas through in-service pipelines. This study introduces an inner notched specimen that more accurately simulates wall thickness reduction at defect sites. The impact of the notch on the material’s mechanical properties was assessed through slow strain rate tensile tests. The hydrogen diffusion process was also analyzed using gaseous hydrogen permeation tests, which quantified changes in hydrogen flux due to the presence of the notch. Furthermore, microstructural characterization near the notch was performed using Electron Backscatter Diffraction (EBSD) to investigate the causes of the observed differences in test results induced by the defect. The findings indicate that susceptibility to hydrogen embrittlement at standard notches was lower than at inner notches with the same relative depth. Consequently, the critical safe hydrogen blending ratio determined from the standard notch may be conservative and should be reconsidered alongside results from the inner notch in practical applications. Notches positioned on the hydrogen-contacting side of the specimen increased the contact area between hydrogen and the metal surface, facilitating the dissociative adsorption of hydrogen molecules. This enhanced hydrogen adsorption and its subsequent penetration into the steel surface. In contrast, outer notches provided a different diffusion path for hydrogen atoms, with a greater decay in hydrogen concentration along the diffusion direction compared to smooth specimens. This led to fewer hydrogen atoms accumulating at the notch on the hydrogen-measuring side.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112839"},"PeriodicalIF":7.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551110","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 : 2025-03-01DOI: 10.1016/j.corsci.2025.112838
Yongkuan Zhou , Jiajie Kang , Guozheng Ma , Lina Zhu , Qiang Da , Xulei Wu , Ruifeng Li , Bin Liu
The effects of Al, Ti and annealing temperature on the microstructure, phase structure, and corrosion resistance of the HVOF-sprayed AlxTiyCoCrFeNi coatings were investigated. Annealing treatment at 500 °C leads to homogenization within the coating structure as well as a reduction in the inhomogeneity of the chemical potential distribution, so the coatings annealed at 500 °C demonstrate outstanding corrosion resistance. However, an increase Al content correlates with a decrease in the passivation film thickness and densification, which ultimately leads to reduced corrosion resistance of the coating. Conversely, an increased trace Ti content enhances the corrosion resistance of high-entropy coatings.
{"title":"Influence of annealing treatment on the microstructure and corrosion resistance of AlxTiyCoCrFeNi high-entropy coatings","authors":"Yongkuan Zhou , Jiajie Kang , Guozheng Ma , Lina Zhu , Qiang Da , Xulei Wu , Ruifeng Li , Bin Liu","doi":"10.1016/j.corsci.2025.112838","DOIUrl":"10.1016/j.corsci.2025.112838","url":null,"abstract":"<div><div>The effects of Al, Ti and annealing temperature on the microstructure, phase structure, and corrosion resistance of the HVOF-sprayed Al<sub>x</sub>Ti<sub>y</sub>CoCrFeNi coatings were investigated. Annealing treatment at 500 °C leads to homogenization within the coating structure as well as a reduction in the inhomogeneity of the chemical potential distribution, so the coatings annealed at 500 °C demonstrate outstanding corrosion resistance. However, an increase Al content correlates with a decrease in the passivation film thickness and densification, which ultimately leads to reduced corrosion resistance of the coating. Conversely, an increased trace Ti content enhances the corrosion resistance of high-entropy coatings.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112838"},"PeriodicalIF":7.4,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534216","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 : 2025-02-28DOI: 10.1016/j.corsci.2025.112837
Changsheng Liu , Liwei Wang , Yuxue Wang , Huiyun Tian , Zhongyu Cui
The effect of hydrogen charging on the electrochemical behavior, surface properties, and the cracking processes of Ti-6Al-3Nb-2Zr-1Mo (Ti80) alloy base metal and welded joint is investigated. Hydrogen promotes the deterioration of the Ti80 including the destruction of the passive film, formation of the hydrides, initiation of the cracks, and decrease of the mechanical properties. The weld metal show much higher susceptibility to hydrogen because of the finer grains with lamellar structure. Hydrogen embrittlement mechanism differs from the hydrogen introducing approach. The hydrides, internal hydrogen, and hydrogen-stress interaction play different roles in the hydrogen damage process of the Ti80 alloy.
{"title":"Effect of hydrogen on the surface properties and cracking behavior of Ti-6Al-3Nb-2Zr-1Mo alloy welded joint","authors":"Changsheng Liu , Liwei Wang , Yuxue Wang , Huiyun Tian , Zhongyu Cui","doi":"10.1016/j.corsci.2025.112837","DOIUrl":"10.1016/j.corsci.2025.112837","url":null,"abstract":"<div><div>The effect of hydrogen charging on the electrochemical behavior, surface properties, and the cracking processes of Ti-6Al-3Nb-2Zr-1Mo (Ti80) alloy base metal and welded joint is investigated. Hydrogen promotes the deterioration of the Ti80 including the destruction of the passive film, formation of the hydrides, initiation of the cracks, and decrease of the mechanical properties. The weld metal show much higher susceptibility to hydrogen because of the finer grains with lamellar structure. Hydrogen embrittlement mechanism differs from the hydrogen introducing approach. The hydrides, internal hydrogen, and hydrogen-stress interaction play different roles in the hydrogen damage process of the Ti80 alloy.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112837"},"PeriodicalIF":7.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518964","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}
In this paper, the effects of basketweave structure and phase electronic structure regulation on the corrosion resistance of Ti-0.3Mo-0.8Ni alloy were investigated. With the increasement of the V quality fraction in the alloy, the lath length and orientation of α phases gradually become shorter and more. The microstructure transforms from lamellar structure to basketweave structure, which the content of the β phase and the ratio of β/α phase boundary are increased greatly. With the increasement of V quality fraction, the passivate film becomes denser, thicker and more stable, which is because the increasement of the ratio of α/β phase boundary makes the passivate film easier to form. In addition, the XPS results show that the proportion of TiO2 and metal oxides in the passivate film increases. The corrosion resistance increases with the addition of V content. Especially, the V quality fraction ≥ 4 wt.%, the corrosion resistance is greatly increased. It is because the V changes the electronic structure of the β and α phase, which reduces the density of electronic states near the Fermi level. Secondly, the content of β phase is greatly increased because of the basketweave structure, which also improves the corrosion resistance.
{"title":"Greatly improving corrosion resistance of Ti alloy by regulating basketweave microstructure and phase electronic structure","authors":"Chaowen Zheng, Qi Wang, Ruirun Chen, Wei Wei, Xin Ding, Hengzhi Fu","doi":"10.1016/j.corsci.2025.112836","DOIUrl":"10.1016/j.corsci.2025.112836","url":null,"abstract":"<div><div>In this paper, the effects of basketweave structure and phase electronic structure regulation on the corrosion resistance of Ti-0.3Mo-0.8Ni alloy were investigated. With the increasement of the V quality fraction in the alloy, the lath length and orientation of α phases gradually become shorter and more. The microstructure transforms from lamellar structure to basketweave structure, which the content of the β phase and the ratio of β/α phase boundary are increased greatly. With the increasement of V quality fraction, the passivate film becomes denser, thicker and more stable, which is because the increasement of the ratio of α/β phase boundary makes the passivate film easier to form. In addition, the XPS results show that the proportion of TiO<sub>2</sub> and metal oxides in the passivate film increases. The corrosion resistance increases with the addition of V content. Especially, the V quality fraction ≥ 4 wt.%, the corrosion resistance is greatly increased. It is because the V changes the electronic structure of the β and α phase, which reduces the density of electronic states near the Fermi level. Secondly, the content of β phase is greatly increased because of the basketweave structure, which also improves the corrosion resistance.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112836"},"PeriodicalIF":7.4,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620512","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 : 2025-02-27DOI: 10.1016/j.corsci.2025.112806
Chengbin Guo , Peng Zou , Baoliang Ren , Yue Li , Zhenyu Chen
A magnetic nanocontainer (FexCo3-xO4) loaded with corrosion inhibitor molecules (benzotriazole, BTA) was prepared through a hydrothermal method, and a pH-controlled release system was designed (FexCo3-xO4@BTA-Cu). Under the 300 mT magnetic field distribution, the FexCo3-xO4@BTA-Cu can be evenly distributed in the epoxy coating. In addition, a hybrid coating with superhydrophobic and bactericidal properties was prepared on the surface of the first coating with evenly distributed magnetic particles. Compared with the pure EP coating, the composite coating exhibits superior corrosion resistance and self-healing performance. Moreover, the underlying anticorrosion, superhydrophobic, anti-icing, and antibacterial mechanisms of the composite coating were analyzed in depth.
{"title":"Study on the multifunctional composite coating with uniformly distributed nanofillers under magnetic field and excellent corrosion control","authors":"Chengbin Guo , Peng Zou , Baoliang Ren , Yue Li , Zhenyu Chen","doi":"10.1016/j.corsci.2025.112806","DOIUrl":"10.1016/j.corsci.2025.112806","url":null,"abstract":"<div><div>A magnetic nanocontainer (Fe<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub>) loaded with corrosion inhibitor molecules (benzotriazole, BTA) was prepared through a hydrothermal method, and a pH-controlled release system was designed (Fe<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub>@BTA-Cu). Under the 300 mT magnetic field distribution, the Fe<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub>@BTA-Cu can be evenly distributed in the epoxy coating. In addition, a hybrid coating with superhydrophobic and bactericidal properties was prepared on the surface of the first coating with evenly distributed magnetic particles. Compared with the pure EP coating, the composite coating exhibits superior corrosion resistance and self-healing performance. Moreover, the underlying anticorrosion, superhydrophobic, anti-icing, and antibacterial mechanisms of the composite coating were analyzed in depth.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112806"},"PeriodicalIF":7.4,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562852","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 : 2025-02-27DOI: 10.1016/j.corsci.2025.112815
Li Zhuoxuan , Dong Xiaomei , Wang Yuhao , Li Qiubo , Yong Xingyue , Wang Shaogang
The synergistic effects of corrosion and alternating stresses accelerate the failure of organic coatings during service. However, the influence of alternating stress on coating failure mechanisms remains insufficiently studied. In this study, X-ray diffraction topography (XRT) and scanning electron microscopy (SEM) were employed to analyze the environmental stress-induced formation and evolution of the micro-defects in a deteriorating organic coating. Electrochemical impedance spectroscopy (EIS) was used to investigate how these stress-induced micro-defects affect coating capacitance. The results showed that environmental stresses not only significantly alter the surface morphology of coated specimens but also promote the initiation and growth of both new and pre-existing micro-defects, leading to changes in their distribution. Additionally, applied stresses were found to favor the formation of non-spherical micro-defects more effectively than corrosion stress. Changes in the number and distribution of micro-defects directly influenced coating capacitance, which, in turn, impacted its protective performance. Overall, this study underscores the critical role of environmental stresses in initiating and propagating micro-defects within organic coating protective systems.
{"title":"Mechanistic insight into the environmental stress-induced formation and evolution of the micro-defects in deteriorating organic coatings","authors":"Li Zhuoxuan , Dong Xiaomei , Wang Yuhao , Li Qiubo , Yong Xingyue , Wang Shaogang","doi":"10.1016/j.corsci.2025.112815","DOIUrl":"10.1016/j.corsci.2025.112815","url":null,"abstract":"<div><div>The synergistic effects of corrosion and alternating stresses accelerate the failure of organic coatings during service. However, the influence of alternating stress on coating failure mechanisms remains insufficiently studied. In this study, X-ray diffraction topography (XRT) and scanning electron microscopy (SEM) were employed to analyze the environmental stress-induced formation and evolution of the micro-defects in a deteriorating organic coating. Electrochemical impedance spectroscopy (EIS) was used to investigate how these stress-induced micro-defects affect coating capacitance. The results showed that environmental stresses not only significantly alter the surface morphology of coated specimens but also promote the initiation and growth of both new and pre-existing micro-defects, leading to changes in their distribution. Additionally, applied stresses were found to favor the formation of non-spherical micro-defects more effectively than corrosion stress. Changes in the number and distribution of micro-defects directly influenced coating capacitance, which, in turn, impacted its protective performance. Overall, this study underscores the critical role of environmental stresses in initiating and propagating micro-defects within organic coating protective systems.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112815"},"PeriodicalIF":7.4,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518962","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 : 2025-02-26DOI: 10.1016/j.corsci.2025.112828
Atharva S. Chikhalikar , Martin Tandler , Daniel E. Mack , Robert Vaßen , David L. Poerschke
This work employs burner rig testing to understand the modes of degradation of a CoNiCrAlY coated superalloy under thermo-cyclic service condition upon exposure to oxide, oxide-sulfate and sulfate deposits. The mixed oxide and oxide-sulfate deposits adhered to the Al2O3 TGO without reacting, likely due to the decomposition of sulfates and sequestration of reactive oxides into silicates. In contrast, sulfate-only deposits readily react with the TGO, forming less-protective calcium aluminates for all cycling conditions. While the TGO on the specimen heat treated isothermally remained protective, increased cycling frequency led to reaction product delamination depleting the Al-reservoir and oxidizing other coating elements.
{"title":"Effect of deposit composition and thermal cycling parameters on oxide- and sulfate-induced hot corrosion of CoNiCrAlY HVOF coatings","authors":"Atharva S. Chikhalikar , Martin Tandler , Daniel E. Mack , Robert Vaßen , David L. Poerschke","doi":"10.1016/j.corsci.2025.112828","DOIUrl":"10.1016/j.corsci.2025.112828","url":null,"abstract":"<div><div>This work employs burner rig testing to understand the modes of degradation of a CoNiCrAlY coated superalloy under thermo-cyclic service condition upon exposure to oxide, oxide-sulfate and sulfate deposits. The mixed oxide and oxide-sulfate deposits adhered to the Al<sub>2</sub>O<sub>3</sub> TGO without reacting, likely due to the decomposition of sulfates and sequestration of reactive oxides into silicates. In contrast, sulfate-only deposits readily react with the TGO, forming less-protective calcium aluminates for all cycling conditions. While the TGO on the specimen heat treated isothermally remained protective, increased cycling frequency led to reaction product delamination depleting the Al-reservoir and oxidizing other coating elements.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112828"},"PeriodicalIF":7.4,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600623","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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