Electrochemical dissolution behavior of IC21 nickel-based single crystal alloy under electrochemical machining conditions
IC21 alloy， as a new Ni3Al-based single crystal superalloy， has become an ideal material for manufacturing a new generation of aero-engine turbine guide vanes due to its high melting point， excellent high-temperature performance， and creep resistance performance. However， turbine guide vanes have co...
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Journal of Materials Engineering
2025-04-01
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| Series: | Cailiao gongcheng |
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| Online Access: | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000602 |
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| author | LI Shun LIU Weidong ZHAO Yonghua YUE Xiaoming |
| author_facet | LI Shun LIU Weidong ZHAO Yonghua YUE Xiaoming |
| author_sort | LI Shun |
| collection | DOAJ |
| description | IC21 alloy， as a new Ni3Al-based single crystal superalloy， has become an ideal material for manufacturing a new generation of aero-engine turbine guide vanes due to its high melting point， excellent high-temperature performance， and creep resistance performance. However， turbine guide vanes have complex structures， such as deep holes and deep and narrow slots， which are difficult to be processed efficiently by traditional machining techniques. Electrochemical machining has become the main method for processing such complex structures due to its advantages， such as no tool loss， high material removal rate， and no cutting stress and thermal effect. This paper focuses on the electrochemical dissolution behavior of IC21 nickel-based single crystal alloy in NaCl and NaNO3 electrolytes. The electrochemical reaction characteristics of IC21 alloy in different electrolytes are analysed by linear scanning voltammetric polarisation curve measurements. In addition， the dissolution characteristics and selective dissolution phenomena of the alloy under different electrolytes and current densities are investigated by current efficiency measurements and surface micro-morphology analysis. It is shown that IC21 alloy exhibits typical passivation-super-passivation transition phenomena in both NaCl and NaNO₃ electrolytes， in which the oxide layer formed in NaNO3 electrolyte exhibits higher stability. Current efficiency measurements show that the dissolution efficiency of IC21 alloy is more stable in NaCl electrolyte， and the dissolution efficiency in NaNO3 electrolyte gradually decreases with the increase of the current density， which exhibits different characteristics from the traditional theory. The dissolution surface morphology analysis further reveals the existence of the selective dissolution phenomenon of IC21 alloy under ECM conditions， and its microscopic mechanism is discussed. Based on the above experimental results， a theoretical model of electrochemical dissolution of IC21 alloy under different electrolyte and current density conditions is established， which provides a theoretical basis for the development and application of ECM processes for IC21 alloy. |
| format | Article |
| id | doaj-art-4d49df0221c945a3aa40eeff2df7b028 |
| institution | Kabale University |
| issn | 1001-4381 |
| language | zho |
| publishDate | 2025-04-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj-art-4d49df0221c945a3aa40eeff2df7b0282025-08-20T03:53:23ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43812025-04-0153413414210.11868/j.issn.1001-4381.2024.0006021001-4381（2025）04-0134-09Electrochemical dissolution behavior of IC21 nickel-based single crystal alloy under electrochemical machining conditionsLI Shun0LIU Weidong1ZHAO Yonghua2YUE Xiaoming3College of Aeronautical Engineering，Civil Aviation University of China，Tianjin 300300，ChinaCollege of Aeronautical Engineering，Civil Aviation University of China，Tianjin 300300，ChinaDepartment of Mechanical and Energy Engineering，Southern University of Science and Technology，Shenzhen 518055，Guangdong，ChinaSchool of Mechanical Engineering，Shandong University，Jinan 250061，ChinaIC21 alloy， as a new Ni3Al-based single crystal superalloy， has become an ideal material for manufacturing a new generation of aero-engine turbine guide vanes due to its high melting point， excellent high-temperature performance， and creep resistance performance. However， turbine guide vanes have complex structures， such as deep holes and deep and narrow slots， which are difficult to be processed efficiently by traditional machining techniques. Electrochemical machining has become the main method for processing such complex structures due to its advantages， such as no tool loss， high material removal rate， and no cutting stress and thermal effect. This paper focuses on the electrochemical dissolution behavior of IC21 nickel-based single crystal alloy in NaCl and NaNO3 electrolytes. The electrochemical reaction characteristics of IC21 alloy in different electrolytes are analysed by linear scanning voltammetric polarisation curve measurements. In addition， the dissolution characteristics and selective dissolution phenomena of the alloy under different electrolytes and current densities are investigated by current efficiency measurements and surface micro-morphology analysis. It is shown that IC21 alloy exhibits typical passivation-super-passivation transition phenomena in both NaCl and NaNO₃ electrolytes， in which the oxide layer formed in NaNO3 electrolyte exhibits higher stability. Current efficiency measurements show that the dissolution efficiency of IC21 alloy is more stable in NaCl electrolyte， and the dissolution efficiency in NaNO3 electrolyte gradually decreases with the increase of the current density， which exhibits different characteristics from the traditional theory. The dissolution surface morphology analysis further reveals the existence of the selective dissolution phenomenon of IC21 alloy under ECM conditions， and its microscopic mechanism is discussed. Based on the above experimental results， a theoretical model of electrochemical dissolution of IC21 alloy under different electrolyte and current density conditions is established， which provides a theoretical basis for the development and application of ECM processes for IC21 alloy.https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000602electrochemical machiningnickel-based single crystal superalloyelectrochemical dissolution mechanismselective dissolution behavior |
| spellingShingle | LI Shun LIU Weidong ZHAO Yonghua YUE Xiaoming Electrochemical dissolution behavior of IC21 nickel-based single crystal alloy under electrochemical machining conditions Cailiao gongcheng electrochemical machining nickel-based single crystal superalloy electrochemical dissolution mechanism selective dissolution behavior |
| title | Electrochemical dissolution behavior of IC21 nickel-based single crystal alloy under electrochemical machining conditions |
| title_full | Electrochemical dissolution behavior of IC21 nickel-based single crystal alloy under electrochemical machining conditions |
| title_fullStr | Electrochemical dissolution behavior of IC21 nickel-based single crystal alloy under electrochemical machining conditions |
| title_full_unstemmed | Electrochemical dissolution behavior of IC21 nickel-based single crystal alloy under electrochemical machining conditions |
| title_short | Electrochemical dissolution behavior of IC21 nickel-based single crystal alloy under electrochemical machining conditions |
| title_sort | electrochemical dissolution behavior of ic21 nickel based single crystal alloy under electrochemical machining conditions |
| topic | electrochemical machining nickel-based single crystal superalloy electrochemical dissolution mechanism selective dissolution behavior |
| url | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2024.000602 |
| work_keys_str_mv | AT lishun electrochemicaldissolutionbehaviorofic21nickelbasedsinglecrystalalloyunderelectrochemicalmachiningconditions AT liuweidong electrochemicaldissolutionbehaviorofic21nickelbasedsinglecrystalalloyunderelectrochemicalmachiningconditions AT zhaoyonghua electrochemicaldissolutionbehaviorofic21nickelbasedsinglecrystalalloyunderelectrochemicalmachiningconditions AT yuexiaoming electrochemicaldissolutionbehaviorofic21nickelbasedsinglecrystalalloyunderelectrochemicalmachiningconditions |