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Hot-dip Galvanizing of Carbon Steel after Cold Rolling with Oxide Scale and Hydrogen Descaling

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Abstract

A new processing method for producing hot-dip galvanized steel is designed and tested, in which pickling is skipped. Hot-roled low carbon steel sheets are roled with oxide scale in an experimental mil at room temperature, prior to annealing under a 20% hydrogen reducing atmosphere and galvanizing on a hotGdip galvanizing simulator. Micro-cracks formed in the oxide scale during cold rolling roughen the steel surface and enlarge the specific surface. Through-thickness cracks provide transport channels for hydrogen, and hence the reduction of oxide scale is enhanced. When the sheet is dipped in the zinc bath, cracks are submerged by liquated zinc and the defects are not distinct after hot-dip galvanizing. The overlay coating occludes with rough surface of the sheet, whereby a superior coating adherence is realized.

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning, 110819, China

    Yong-quan He (Doctor Candidate), Tao Jia, Xiao-jiang Liu, Guang-ming Cao, Zhen-yu Liu (Doctor, Professor) & Jun Li

  2. Baosteel Research Institute, Shanghai, 201900, China

    Jun Li

Authors
  1. Yong-quan He
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  2. Tao Jia
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  3. Xiao-jiang Liu
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  4. Guang-ming Cao
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  5. Zhen-yu Liu
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  6. Jun Li
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Corresponding authors

Correspondence to Yong-quan He or Zhen-yu Liu.

Additional information

Foundation Item: Item Sponsored by National Science and Technology Pilar Program of China (2011BAE13B04)

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He, Yq., Jia, T., Liu, Xj. et al. Hot-dip Galvanizing of Carbon Steel after Cold Rolling with Oxide Scale and Hydrogen Descaling. J. Iron Steel Res. Int. 21, 222–226 (2014). https://doi.org/10.1016/S1006-706X(14)60034-0

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60034-0

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