Electrochemical growth of a corrosion-resistant multi-layer scale to enable an oxygen-evolution inert anode in molten carbonate

2018 ◽  
Vol 279 ◽  
pp. 250-257 ◽  
Author(s):  
Diyong Tang ◽  
Kaiyuan Zheng ◽  
Huayi Yin ◽  
Xuhui Mao ◽  
Donald R. Sadoway ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Inert Anode ◽  
Molten Carbonate ◽  
Corrosion Resistant ◽  
Electrochemical Growth

A new corrosion‐resistant material for use as an inert anode in electrolytic molten salt aluminium extraction systems

2004 ◽  
Vol 51 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Li Yuchun ◽  
Zhou Tao ◽  
Zhou Kechao ◽  
Liu Yong ◽  
Liu Fang ◽  
...  
Keyword(s):  
Molten Salt ◽  
Inert Anode ◽  
Resistant Material ◽  
Corrosion Resistant

scholarly journals Corrosion Behavior of Fe-Ni-Al Alloy Inert Anode in Cryolite Melts

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 399 ◽  
Author(s):  
Pingping Guan ◽  
Aimin Liu ◽  
Zhongning Shi ◽  
Xianwei Hu ◽  
Zhaowen Wang
Keyword(s):  
Inert Anode ◽  
Aluminum Electrolysis ◽  
Al Alloys ◽  
Al Alloy ◽  
Protective Film ◽  
Active Dissolution ◽  
Corrosion Resistant ◽  
Inert Anodes ◽  
Passivation Potential ◽  
Tafel Curve

Fe-Ni-based alloys are promising materials of inert anodes for use in aluminum electrolysis and adding Al can further improve the corrosion resistance. Fe-Ni-Al alloys with 1.4–8.6 wt.% Al were prepared by vacuum melting, and their corrosion as anodes during the production of pure Al (98.14–99.68%) by electrolysis was studied in a melt of NaF-AlF3-NaCl-CaF2-Al2O3 at 850 °C. The corrosion layer on the anode contains fluorine salt that corrodes the oxide film, and the inner layer is Ni-enriched while the outer layer is enriched with Fe and O due to the preferential oxidation of Fe. The electrolytically deposited oxide films on Fe-Ni-Al alloys with different compositions contains Fe2O3, Fe3O4, NiO, Al2O3, FeAl2O4, NiFe2O4, and other protective oxides, making the alloys very corrosion-resistant. The linear voltammetric curves can be divided into three parts: active dissolution, passivation transition, and over-passivation zones. The alloy with 3.9 wt.% Al (57.9Fe-38.2Ni-3.9Al) has a relatively negative passivation potential, and therefore, is easier to become passivated. According to the Tafel curve, this alloy shows a relatively positive corrosion potential as anode (1.20 V vs. Al/AlF3), and thus can form a protective film.

High-performance oxygen evolution electrocatalysis by boronized metal sheets with self-functionalized surfaces

2019 ◽  
Vol 12 (2) ◽  
pp. 684-692 ◽  
Author(s):  
Feifan Guo ◽  
Yuanyuan Wu ◽  
Hui Chen ◽  
Yipu Liu ◽  
Li Yang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
High Performance ◽  
Corrosion Resistant ◽  
Functionalized Surfaces ◽  
Metal Sheets

An effective boronization strategy is presented for transforming metal sheets into highly intrinsic active, stable and corrosion-resistant oxygen evolution electrodes.

scholarly journals Rearrangement of Oxide Scale on Ni-11Fe-10Cu-6Al Pre-Oxidized at 950 °C during Anodic Polarization in Molten Carbonate

2021 ◽  
Author(s):  
Xinhua Cheng ◽  
Kaifa Du ◽  
Dihua Wang
Keyword(s):  
Electric Field ◽  
Oxide Scale ◽  
Oxygen Evolution ◽  
Corrosion Protection ◽  
Anodic Polarization ◽  
Molten Carbonate ◽  
Inert Anodes ◽  
Structure Rearrangement

Abstract The effect of anodic polarization in molten Na2CO3-K2CO3 at 750 °C was investigated on the structure of oxide scale formed by pre-oxidation of Ni-11Fe-10Cu-6Al alloy at 950 °C in air. The pre-formed oxide scale evolves and rearranges under anodic polarization related to melt corrosion and non-uniformly distributed electric field. Both of pre-oxidized and as-rearranged electrodes can serve as inert anodes with oxygen evolution. Anodic polarization exhibits a negative rearrangement-destructivity effect for the pre-formed oxide scale with corrosion protection of the rearranged oxide scale decreasing. The structure rearrangement of pre-formed oxide scale is also discussed during anodic polarization in the melt.

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