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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ժҪ 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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	Jun-jian TANG
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	Xiang-Jun Zhang
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�ؼ�� �� Hot-rolling plates, Hydrogen reduction, eutectoid structure, micro-hardness, corrosion resistance

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.

Key words�� Hot-rolling plates Hydrogen reduction eutectoid structure micro-hardness corrosion resistance

�ո��: 2016-11-14 ��: 2017-10-18

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Zhi-feng Li,Yong-quan He,Guang-ming Cao,Jun-jian Tang,Xiang-jun Zhang,Zhen-yu Liu. 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]. �й��ڿ��, 2017, 24(10): 1032-1040. Zhi-feng Li,Yong-quan He,Guang-ming Cao,Jun-jian Tang,Xiang-jun Zhang,Zhen-yu Liu. Effects of Al contents on microstructure and properties of hot-dip Zn-Al alloy coatings on hydrogen reduced hot-rolled steel without acid pickling. Chinese Journal of Iron and Steel, 2017, 24(10): 1032-1040.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/CN/ �� http://gt.chinamet.cn/Jweb_gtyjxb_en/CN/Y2017/V24/I10/1032

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