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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 |
| Zhi-feng Li1,Yong-quan He2,Guang-ming Cao1,Jun-jian Tang1,Xiang-jun Zhang1,Zhen-yu Liu1 |
1 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China
2 School of Mechatronics Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450015, Henan, China |
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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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Received: 14 November 2016
Published: 18 October 2017
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2017, Vol. 24 
