Effect of Oxide Scale on Hot Dip Zn-Al-Mg Alloy Coating Prepared by Reduction Combined with Induction Heating

Metals

Yongzhe Fan¹  Xue Zhao¹  An Du¹  Minyun Xu¹  Xiaoming Cao¹  Yijie Zhang¹  Ruina Ma¹ 

[1] School of Materials Science and Engineering, Hebei University of Technology, Key Lab for New Type of Functional Materials in Hebei Province, Tianjin Key Lab Material Laminating Fabrication and Interface, Tianjin 300132, China;

关键词: oxide scale;    reduction method;    Zn-Al-Mg alloy;    Fe-Al alloy layer;   

DOI  :  10.3390/met10111519

来源: DOAJ

【 摘 要 】

Hot dipping Zn-Al-Mg coatings were prepared by rapid induction heating combined with gas protection. The influence of oxide scale on the structure and surface quality of a hot-dip Zn-6Al-3Mg alloy coating was studied in this paper. The results showed that the reaction of Fe-Al was suppressed by the scale on the surface of the steel plate. When the thickness of scale was 10 μm and the steel entry temperature was 900 °C, the surface quality of the coating was good. The Zn-Al-Mg coatings mainly consisted of the ternary eutectic structure of Zn/Al/MgZn₂ and Fe₄Al₁₃ at the interface. When the scale thickness was 2–3 μm with the same steel entry temperature, the surface quality of the coating was poor, and serious stripe-like protrusion defects were formed on the surface of the coating, which was mainly caused by the Fe₄Al₁₃ phase separating from the substrate / coating interface into the overlay.

【 授权许可】

Unknown