Reaction of Dross Formation in Continuous Galvanizing

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  • 連続溶融亜鉛メッキにおけるドロス生成反応について
  • レンゾク ヨウユウ アエン メッキ ニ オケル ドロス セイセイ ハンノウ ニ ツイテ

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A study has been carried out on the dross formation in continuous galvanizing in relation to the aluminiumcontent in the bath.<BR>Iron and aluminium concentrations in drosses formed in conventional galvanizing lines are determined.In the laboratory, Zn alloys containing 0.22% Pb, 0.13-4.60% Al and 0.066-0.24% Fe are molten ingraphite crucibles and held at 465°C for 40hrs before cooling. Using the sectioned ingots, spectroscopic analysisof the portions free from dross and quantitative microscopy analysis of dross compounds are performed:<BR>On the basis of these results, the amount of dross and that of aluminium consumed in the dross formationreaction in conventional processes are estimated. Conclusions derived are as follows:<BR>Drosses contain two compounds, namely δ and Fe2Al5.<BR>When the aluminium content in the bath is in the range of 0.09-0.14%, δ and Fe2Al5 can coexist. Inthis case the higher the aluminium content, the lower the fraction of δ-compound. When the aluminiumcontent is higher than 0.15% the δ-compound can not be found.<BR>The amount of the bottom dross is estimated to decrease rapidly with increasing the aluminium contentin the bath up to 0.14% and becomes negligible above 0.15% Al. The amount of the top dross, however, increasesrapidly with increasing the aluminium content up to 0.14% and decreases gradually above 0.15% Al.<BR>The amount of aluminium consumed in the dross formation reaction is estimated proportional to the amount of iron dissolved from sheets.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 60 (1), 96-103, 1974

    The Iron and Steel Institute of Japan

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