Electrochemical Preparation of Fe 0.5 CoNiCuSn x Medium Entropy Alloys and Their Corrosion Properties

The exploration of efficient preparation methods and corrosion-resistant medium entropy alloys (MEAs) has attracted significant attentions in recent years. In this paper, powdery Fe 0.5 CoNiCuSn x (x = 0, 0.05, 0.08, and 0.1) MEAs were prepared by the one-step electrochemical reduction of metal oxid...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2021-12, Vol.168 (12), p.121503
Main Authors: Huang, Jian, Wang, Peilin, Du, Kaifa, Yin, Huayi, Wang, Dihua
Format: Article
Language:English
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Summary:The exploration of efficient preparation methods and corrosion-resistant medium entropy alloys (MEAs) has attracted significant attentions in recent years. In this paper, powdery Fe 0.5 CoNiCuSn x (x = 0, 0.05, 0.08, and 0.1) MEAs were prepared by the one-step electrochemical reduction of metal oxides in molten Na 2 CO 3 -K 2 CO 3 using a Ni11Fe10Cu oxygen-evolution inert anode. The effects of Sn on the structures, morphologies, and corrosion behaviors of the prepared MEAs were systematically investigated. The electrolytic MEAs exhibited a single face-centered cubic phase at x≤0.05, and the CuSn-rich phase would be segregated in the alloys at 0.08 ≤ x ≤ 0.1. Moreover, increasing Sn reduced the particles size of MEAs, and Sn improved the corrosion resistance of MEAs in 0.5 M H 2 SO 4 , 1 M KOH, and 3.5% NaCl solutions. The electrolytic MEA(Sn 0.05 ) exhibited the best corrosion resistance, which had the corrosion current densities of 3.7 × 10 −5 A cm −2 (0.5 M H 2 SO 4 ), 1.2 × 10 −5 A cm −2 (1 M KOH), and 1.6 × 10 −5 A cm −2 (3.5 wt% NaCl) at room temperature. Overall, this paper not only provides a green approach to preparing Sn-containing MEAs, but also offers an efficient way to control structures and morphologies, thereby improving the corrosion resistance.
ISSN:0013-4651
1945-7111
DOI:10.1149/1945-7111/ac3d05