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Electrochemical derusting in molten Na2CO3-K2CO3

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Abstract

The formation of a rust layer on iron and steels surfaces accelerates their degradation and eventually causes material failure. In addition to fabricating a protective layer or using a sacrificial anode, repairing or removing the rust layer is another way to reduce the corrosion rate and extend the lifespans of iron and steels. Herein, an electrochemical healing approach was employed to repair the rust layer in molten Na2CO3-K2CO3. The rusty layers on iron rods and screws were electrochemically converted to iron in only several minutes and a metallic luster appeared. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) analyses showed that the structures of the rust layer after healing were slightly porous and the oxygen content reached a very low level. Thus, high-temperature molten-salt electrolysis may be an effective way to metalize iron rust of various shapes and structures in a short time, and could be used in the repair of cultural relics and even preparing a three-dimensional porous structures for other applications.

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Acknowledgements

This work is financially supported by the Fundamental Research Funds for the Central Universities (No. N172505002), the National Natural Science Foundation of China (No. 51704060), the National Thousand Youth Talent Program of China, and the 111 Project (No. B16009).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education, Shenyang, 110819, China

    Dong-yang Zhang, Xue Ma, Hong-wei Xie, Xiang Chen, Jia-kang Qu, Qiu-shi Song & Hua-yi Yin

  2. Key Laboratory of Data Analytics and Optimization for Smart Industry of Ministry of Education, Northeastern University, Shenyang, 110819, China

    Hua-yi Yin

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  1. Dong-yang Zhang
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  2. Xue Ma
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  3. Hong-wei Xie
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  4. Xiang Chen
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Correspondence to Hua-yi Yin.

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Zhang, Dy., Ma, X., Xie, Hw. et al. Electrochemical derusting in molten Na2CO3-K2CO3. Int J Miner Metall Mater 28, 637–643 (2021). https://doi.org/10.1007/s12613-020-2068-2

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  • DOI: https://doi.org/10.1007/s12613-020-2068-2

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