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作者:

Wang, Zengjie (Wang, Zengjie.) | Xue, Jilai (Xue, Jilai.) | Feng, Luxing (Feng, Luxing.) | Dai, Fangyin (Dai, Fangyin.)

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EI Scopus

摘要:

Corrosion resistance in cryolitic melts is the most important property for inert anode used in aluminum electrolysis. Ni-Fe-Cr alloy anodes were prepared with a protective layer on their surface through a pre-oxidation procedure, and corrosion tests were carried out in a laboratory aluminum electrolysis cell at 950 °C. The microstructures of the anodes before and after the electrolysis were inspected using XRD and SEM techniques. It is found that a starting protective layer formed after 10-20 hour pre-oxidation could be sufficient to make the anode maintaining function during the corrosion tests. A corrosion layer with varying thickness on the metal anodes at a current density of 0.75 A/cm2 was formed in aluminum electrolysis in the cryolitic melts, where various metal fluorides were involved in the surface reactions. Detailed analysis revealed that the chemical compositions of the corrosion-oxide protective layers on the metal anodes varied due to selective corrosion and migration of Fe, Ni, Cr, and O crossing the interface. The results may provide useful technical data for materials design and process development for metal inert anode that can maintain the function through a dynamic oxide protective layer during aluminum electrolysis. Copyright © 2014 by The Minerals, Metals & Materials Society.

关键词:

Aluminum corrosion Anodes Chemical analysis Chromium alloys Corrosion Corrosion protection Corrosion resistance Corrosive effects Dealloying Electrolysis Fluorine compounds Iron alloys Light metals Nickel alloys Surface reactions Ternary alloys Welds

作者机构:

  • [ 1 ] [Wang, Zengjie]College of Materials Science and Engineering, Beijing University of Technology, Pingleyuan 100, Beijing 100124, China
  • [ 2 ] [Xue, Jilai]School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Beijing 100083, China
  • [ 3 ] [Feng, Luxing]School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Beijing 100083, China
  • [ 4 ] [Dai, Fangyin]School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Beijing 100083, China

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ISSN: 0147-0809

年份: 2014

页码: 1315-1319

语种: 英文

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