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Effects of Al contents on microstructure and properties of hot-dip Zn-Al alloy coatings on hydrogen reduced hot-rolled steel without acid pickling

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Abstract

A new hot-dip galvanizing method was employed on hot-rolled low carbon steel. The effects of Al contents on microstructure, micro-hardness and corrosion resistance of Zn-Al alloy coatings were systematically investigated. Phase composition, microstructure and element distribution in Zn-Al alloy coatings were analyzed using X-ray diffraction (XRD) and electron probe micro analysis (EPMA), respectively. It is found that Al content (0.6–6. 0 wt. %) in galvanizing zinc affects surface quality and adhesion between coatings and matrix in the newly developed method. In addition, with increasing Al content, micro-hardness significantly increased due to the increase in Zn-Al eutectoid phases. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) also revealed that increase in Al plays a noticeable role in improving the corrosion resistance of Zn-Al alloy coatings.

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Authors and Affiliations

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

    Zhi-feng Li, Guang-ming Cao Ph.D. (Assoc. Prof.), Jun-jian Tang, Xiang-jun Zhang & Zhen-yu Liu Ph.D. (Prof.)

  2. School of Mechatronics Engineering, Zhengzhou University of Aeronautics, 450015, Zhengzhou, Henan, China

    Yong-quan He

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  1. Zhi-feng Li
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  2. Yong-quan He
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  3. Guang-ming Cao Ph.D.
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  4. Jun-jian Tang
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  5. Xiang-jun Zhang
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  6. Zhen-yu Liu Ph.D.
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Correspondence to Guang-ming Cao Ph.D. or Zhen-yu Liu Ph.D..

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Li, Zf., He, Yq., Cao, Gm. et al. Effects of Al contents on microstructure and properties of hot-dip Zn-Al alloy coatings on hydrogen reduced hot-rolled steel without acid pickling. J. Iron Steel Res. Int. 24, 1032–1040 (2017). https://doi.org/10.1016/S1006-706X(17)30150-4

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  • DOI: https://doi.org/10.1016/S1006-706X(17)30150-4

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