Crystal Structure Analysis of Top Dross in Molten Zinc Bath by First Principles Calculation and Synchrotron X-ray Diffraction

Konishi Takeshi, Sawada Hideaki, Doi Takashi, Ushioda Kohsaku

doi:10.2355/tetsutohagane.tetsu-2019-088

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第一原理計算と放射光X線回折による溶融亜鉛めっき浴中のトップドロスの結晶構造解析
ダイイチゲンリケイサントホウシャコウ Xセンカイセツニヨルヨウユウアエンメッキヨクチュウノトップドロスノケッショウコウゾウカイセキ
Crystal Structure Analysis of Top Dross in a Molten Zinc Bath by First Principle Calculation and Synchrotron X-ray Diffraction

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<p>In a molten zinc bath in a continuous galvanizing line, the top dross particles crystallize as a Zn-containing intermetallic Fe₂Al₅ compound, which generates surface defects in the final product by easily adhering to the steel sheets. The present study focused on analysis of the crystal structure of a top dross by first principles calculation and synchrotron X-ray diffraction of the top dross prepared in a laboratory. The following results were obtained: first principles calculation on the top dross suggested that two Al atoms at four of the partially occupied Al sites in the Fe₂Al₅ structure proposed by Mihalkovič et al., were replaced by two Zn atoms. In addition, the Al atoms at both the types of partially occupied Al sites in Fe₂Al₅ proposed by Burkhardt et al., were equally replaced by Zn atoms. The proposed crystal structure of the top dross was verified by conducting X-ray diffraction profile analysis using RIETAN-FP simulations as well as the experimentally determined lattice constant of the Zn-containing top dross.</p>

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ISIJ International

ISIJ International 61 (3), 929-936, 2021-03-15

The Iron and Steel Institute of Japan

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