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Dissolution Behavior of Iron and Steel Materials in Liquid Magnesium

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Abstract

The dissolution of metallic elements from Fe and steel materials into pure liquid Mg was investigated with the aim of improving control of impurities in Mg during processes such as Mg-alloy production and Ti smelting. Pure Mg was melted between 1073 and 1323 K (800 and 1050 °C) for 24 to 96 hours in closed crucibles made of pure Fe, low-carbon steel, or austenitic stainless steel SUS316. From the experiments using the pure Fe crucible, the relationship between the solubility of Fe in liquid Mg [Csol,Fe (mass pct)] and temperature [T (K)] was determined to be log(Csol,Fe) = − 3.67 × 103/T + 2.48 (± 0.06), from which the standard Gibbs energy of Fe dissolution in liquid Mg was evaluated. The amount of Fe dissolved from low-carbon steel was the same as that from pure Fe. From SUS316, not only Fe but also Cr and Ni dissolved into liquid Mg; the Fe and Cr concentrations in liquid Mg did not change significantly over time, whereas the Ni concentration increased monotonically. Preferential Ni dissolution resulted in a Ni-poor layer on the SUS316 surface. Finally, using the experimental data of Fe dissolution from low-carbon steel, the Fe contamination route in the current Ti smelting process, where a large amount of Mg is used as a reducing agent, is discussed.

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Acknowledgments

The authors are grateful to Messrs. Chihiro Taki, Masanori Yamaguchi, Yosuke Inoue, and Meiji Watanabe of Toho Titanium Co., Ltd. for valuable suggestions. The authors thank Messrs. Eiji Shirane and Yoji Iwai of Toho Titanium Co., Ltd. for sample analysis. This paper is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO). This research was partly supported by the Japan Society for the Promotion of Science (JSPS) through the Grant-in-Aid for Scientific Research (S) (KAKENHI Grant No. 26220910).

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Authors and Affiliations

  1. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan

    Yu-ki Taninouchi, Katsuhiro Nose & Toru H. Okabe

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  1. Yu-ki Taninouchi
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  2. Katsuhiro Nose
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  3. Toru H. Okabe
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Correspondence to Yu-ki Taninouchi.

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Manuscript submitted March 12, 2018.

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Taninouchi, Yk., Nose, K. & Okabe, T.H. Dissolution Behavior of Iron and Steel Materials in Liquid Magnesium. Metall Mater Trans B 49, 3432–3443 (2018). https://doi.org/10.1007/s11663-018-1384-7

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