The corrosion behavior of a Ni0.91Cr0.04Cu0.05 anode for the electroreduction of Fe2O3 in molten NaOH

Donghua Tian; Handong Jiao; Jiusan Xiao; Mingyong Wang; Shuqiang Jiao

doi:10.1016/j.jallcom.2018.08.073

The corrosion behavior of a Ni_0.91Cr_0.04Cu_0.05 anode for the electroreduction of Fe₂O₃ in molten NaOH

Donghua Tian, Handong Jiao, Jiusan Xiao^*, Mingyong Wang, Shuqiang Jiao

^*Corresponding author for this work

University of Science and Technology Beijing

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Stable inert anode is crucial to the electrochemical production of iron and oxygen from Fe₂O₃ as cathode in molten NaOH. A low-cost Ni_0.91Cr_0.04Cu_0.05 inert anode is proposed and the corrosion behaviors are studied by polarization curves, Tafel plots, electrochemical impedance spectroscope (EIS). The results indicate that the Ni_0.91Cr_0.04Cu_0.05 anode is more stable than Ni_0.82Cr_0.18 and graphite. A passivation layer consisting of (Ni_0.8Cu_0.2)O and little Cr₂O₃ is formed, preventing the Ni_0.91Cr_0.04Cu_0.05 anode from corroding. The corrosion rate of Ni_0.91Cr_0.04Cu_0.05 is 6.36 × 10⁻⁵ g cm⁻² h⁻¹ after 24 h electrolysis. The remarkable result indicates the Ni_0.91Cr_0.04Cu_0.05 alloy is a promising inert anode in NaOH melt for a green metallurgical extraction process.

Original language	English
Pages (from-to)	977-982
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	769
DOIs	https://doi.org/10.1016/j.jallcom.2018.08.073
Publication status	Published - 15 Nov 2018
Externally published	Yes

Keywords

Electrolysis
Inert anode
Molten NaOH
NiCrCu alloy

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10.1016/j.jallcom.2018.08.073

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title = "The corrosion behavior of a Ni0.91Cr0.04Cu0.05 anode for the electroreduction of Fe2O3 in molten NaOH",

abstract = "Stable inert anode is crucial to the electrochemical production of iron and oxygen from Fe2O3 as cathode in molten NaOH. A low-cost Ni0.91Cr0.04Cu0.05 inert anode is proposed and the corrosion behaviors are studied by polarization curves, Tafel plots, electrochemical impedance spectroscope (EIS). The results indicate that the Ni0.91Cr0.04Cu0.05 anode is more stable than Ni0.82Cr0.18 and graphite. A passivation layer consisting of (Ni0.8Cu0.2)O and little Cr2O3 is formed, preventing the Ni0.91Cr0.04Cu0.05 anode from corroding. The corrosion rate of Ni0.91Cr0.04Cu0.05 is 6.36 × 10−5 g cm−2 h−1 after 24 h electrolysis. The remarkable result indicates the Ni0.91Cr0.04Cu0.05 alloy is a promising inert anode in NaOH melt for a green metallurgical extraction process.",

keywords = "Electrolysis, Inert anode, Molten NaOH, NiCrCu alloy",

author = "Donghua Tian and Handong Jiao and Jiusan Xiao and Mingyong Wang and Shuqiang Jiao",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = nov,

day = "15",

doi = "10.1016/j.jallcom.2018.08.073",

language = "English",

volume = "769",

pages = "977--982",

journal = "Journal of Alloys and Compounds",

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T1 - The corrosion behavior of a Ni0.91Cr0.04Cu0.05 anode for the electroreduction of Fe2O3 in molten NaOH

AU - Tian, Donghua

AU - Jiao, Handong

AU - Xiao, Jiusan

AU - Wang, Mingyong

AU - Jiao, Shuqiang

PY - 2018/11/15

Y1 - 2018/11/15

N2 - Stable inert anode is crucial to the electrochemical production of iron and oxygen from Fe2O3 as cathode in molten NaOH. A low-cost Ni0.91Cr0.04Cu0.05 inert anode is proposed and the corrosion behaviors are studied by polarization curves, Tafel plots, electrochemical impedance spectroscope (EIS). The results indicate that the Ni0.91Cr0.04Cu0.05 anode is more stable than Ni0.82Cr0.18 and graphite. A passivation layer consisting of (Ni0.8Cu0.2)O and little Cr2O3 is formed, preventing the Ni0.91Cr0.04Cu0.05 anode from corroding. The corrosion rate of Ni0.91Cr0.04Cu0.05 is 6.36 × 10−5 g cm−2 h−1 after 24 h electrolysis. The remarkable result indicates the Ni0.91Cr0.04Cu0.05 alloy is a promising inert anode in NaOH melt for a green metallurgical extraction process.

AB - Stable inert anode is crucial to the electrochemical production of iron and oxygen from Fe2O3 as cathode in molten NaOH. A low-cost Ni0.91Cr0.04Cu0.05 inert anode is proposed and the corrosion behaviors are studied by polarization curves, Tafel plots, electrochemical impedance spectroscope (EIS). The results indicate that the Ni0.91Cr0.04Cu0.05 anode is more stable than Ni0.82Cr0.18 and graphite. A passivation layer consisting of (Ni0.8Cu0.2)O and little Cr2O3 is formed, preventing the Ni0.91Cr0.04Cu0.05 anode from corroding. The corrosion rate of Ni0.91Cr0.04Cu0.05 is 6.36 × 10−5 g cm−2 h−1 after 24 h electrolysis. The remarkable result indicates the Ni0.91Cr0.04Cu0.05 alloy is a promising inert anode in NaOH melt for a green metallurgical extraction process.

KW - Electrolysis

KW - Inert anode

KW - Molten NaOH

KW - NiCrCu alloy

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U2 - 10.1016/j.jallcom.2018.08.073

DO - 10.1016/j.jallcom.2018.08.073

M3 - Article

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SN - 0925-8388

VL - 769

SP - 977

EP - 982

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

The corrosion behavior of a Ni_0.91Cr_0.04Cu_0.05 anode for the electroreduction of Fe₂O₃ in molten NaOH

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Keywords

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