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Arabian Journal for Science and Engineering

, Volume 43, Issue 11, pp 6285–6295 | Cite as

The Effect of La on the Oxidation and Corrosion Resistance of \(\hbox {Cu}_{52}\hbox {Ni}_{30}\hbox {Fe}_{18}\) Alloy Inert Anode for Aluminum Electrolysis

  • Liu Ying
  • Zhang Yong’an
  • Wang Wei
  • Li Dongsheng
  • Ma Junyi
  • Du Juan
Research Article - Chemical Engineering
  • 11 Downloads

Abstract

The effect of La on the high-temperature oxidation and corrosion performance of ternary \(\hbox {Cu}_{52}\hbox {Ni}_{30}\hbox {Fe}_{18}\) alloy inert anode for aluminum electrolysis in low-temperature KF–NaF–\(\hbox {AlF}_{3}\) electrolyte was studied. The results indicate that the oxidation kinetics of (\(\hbox {Cu}_{52}\hbox {Ni}_{30}\hbox {Fe}_{18})_{1{-}x}\hbox {La}_{x}\) (x = 0, 0.5, 1, 2 wt%) alloys at \(850\,^{\circ }\hbox {C}\) under 1 atm oxygen atmosphere follow the parabolic law. The oxidation scales are stratified state, which contains the Cu oxide as the external layer. While the internal layer of the oxidation products are the mixture of Fe oxide, Ni oxide and nickel ferrite. The Cu outward diffusion oxidation is the dominant factor for the \(\hbox {Cu}_{52}\hbox {Ni}_{30}\hbox {Fe}_{18}\) alloy during high temperature oxidation. After adding La to the \(\hbox {Cu}_{52}\hbox {Ni}_{30}\hbox {Fe}_{18}\) alloy, the oxidation mechanism has become the combined action with outward diffusion of Cu and internal diffusion of O to form the Ni/Fe oxide underneath the outmost CuO layer. The corrosion resistance of \(\hbox {Cu}_{52}\hbox {Ni}_{30}\hbox {Fe}_{18}\) alloy anode during the aluminum electrolysis is further improved by adding 0.5 wt% La. Compared with \(\hbox {Cu}_{52}\hbox {Ni}_{30}\hbox {Fe}_{18 }\)alloy, the corrosion rate of the \(\hbox {Cu}_{52}\hbox {Ni}_{30}\hbox {Fe}_{18 }\)alloy with 0.5 wt% addition of La has reduced from 1.9 to 1.8 cm/a.

Keywords

Aluminum electrolysis Inert anode Cu–Ni–Fe alloy Rare earth La High-temperature oxidation 

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Notes

Acknowledgements

This work was financially supported by the Major Science and Technology Programs of CHALCO(ZB2013CBBCe1). The authors thank the Zhengzhou Non-ferrous Metals Research Institute Co. Ltd of CHALCO for supporting this work.

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Nonferrous Metals and ProcessesGeneral Research Institute for Nonferrous MetalsBeijingChina
  2. 2.Zhengzhou Non-ferrous Metals Research Institute Co. Ltd of CHALCOZhengzhouChina
  3. 3.School of Metallurgy and EnvironmentCentral South UniversityChangshaChina

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