التفاصيل البيبلوغرافية
| العنوان: |
Anodic Dissolution Behavior of Al Alloys Containing Al6Fe or β- AlFeSi in EmImCl--AlCl3 Electrolyte During Electrorefining. |
| المؤلفون: |
Junji Nunomura, Hisayoshi Matsushima, Yoshihiko Kyo, Yoichi Kojima, Mikito Ueda |
| المصدر: |
Journal of The Electrochemical Society; Dec2023, Vol. 170 Issue 12, p1-11, 11p |
| مصطلحات موضوعية: |
TERNARY alloys, BINARY metallic systems, INTERMETALLIC compounds, ALLOYS, ELECTROLYTES, LIQUID alloys, SCANNING electron microscopy |
| مستخلص: |
To produce over 99.9% of high-purity Al from Al alloys containing Al6Fe or β-AlFeSi through electrorefining, their anodic dissolution and cathodic electrodeposition characteristics should be clarified. In this study, the anodic dissolution and cathodic electrodeposition behavior of Al--Fe binary and Al--Fe--Si ternary alloys were investigated in an EmImCl--AlCl3 ionic liquid electrolyte at 323 K. Anodic polarization measurements, constant potential electrolysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), field-emission SEM (FE-SEM), and energy dispersive spectroscopy (EDS) were used to study the anode and electrodeposits on the cathode. Constant potential electrolysis showed that Fe dissolved from Al6Fe in the Al--Fe anode at 0.7 V vs Al/Al(III) and from β-AlFeSi in the Al--Fe--Si anode at 1.4 V and was co-deposited with Al on the cathode. Notably, Si did not dissolve from β-AlFeSi at either potential. A combination of controlled anodic dissolution potential and the use of the Al alloy containing β-AlFeSi further suppressed the dissolution and cathodic co-deposition of Fe, affording high-purity Al on the cathode. This suggests that Al alloys with intermetallic compounds that are less likely to dissolve Fe at the anode are optimal for obtaining over 99.9% of high-purity Al from Al alloys containing Fe in the electrorefining method. [ABSTRACT FROM AUTHOR] |
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