热镀锌用锌铝镁合金的制备及组织结构分析  

Preparation and microstructural analysis of Zn-Al-Mg alloy for hot galvanizing

作　　者：翟永周 郭伟朋 李海龙 李自强 ZHAI Yong-zhou;GUO Wei-peng;LI Hai-long;LI Zi-qiang

机构地区：[1]河南豫光锌业有限公司,河南济源459000

出　　处：《中国有色冶金》2021年第5期69-72,77,共5页China Nonferrous Metallurgy

摘　　要：锌铝镁合金镀层具有优异的耐腐蚀性能、较高的切口自愈性和成形性能,高纯度锌铝镁合金的生产制备成为了国内外大型钢企的研究热点。河南豫光锌业有限公司采用工频感应炉制备了Zn-2%Al-2%Mg及Zn-5%Al-5%Mg两种热镀锌用锌铝镁合金,对其组织结构及成分偏析进行分析,表明合金组织呈均匀弥散分布,且无夹杂、氧化物存在;Zn-2%Al-2%Mg凝固组织主要由初生Zn相、Zn/MgZn_(2)二元共晶组织和Zn/MgZn_(2)/Al三元共晶组织组成;Zn-5%Al-5%Mg凝固组织中出现较多粗大的Al/MgZn_(2)二元共晶体和粗大的Mg_(2)Zn_(11)相。对Zn-2%Al-2%Mg进行重熔实验,结果表明重熔后无氧化渣存在;通过对合金锭横向及纵向进行取样分析,发现铝、镁横向偏析较小,纵向偏析在0.1%左右。本文对此次锌铝镁合金制备试验的详细过程及工艺参数进行了阐述,以期为相关研究人员提供参考。Thanks to the excellent corrosion resistance,high notch self-healing and formability of Zn-Al-Mg alloy coating,the preparation of high-purity Zn-Al-Mg alloy has become a research focus of large steel enterprises at home and abroad.Two Zn-2%Al-2%Mg and Zn-5%Al-5%Mg alloys for hot galvanizing were prepared by power frequency induction furnace in Henan Yuguang Zinc Industry Co.,Ltd.,and by analyzing the microstructure and composition segregation of the alloys,it is found that the microstructure of the alloys is uniformly dispersed,and there is no inclusion and oxide.The solidification microstructure of Zn-2%Al-2%Mg is mainly composed of primary Zn phase,Zn/MgZn_(2) binary eutectic structure and Zn/MgZn_(2)/Al ternary eutectic structure.There are lots of coarse Al/MgZn_(2) binary eutectic and coarse Mg_(2)Zn_(11) phase in the solidification microstructure of Zn-5%Al-5%Mg.The remelting experiment of Zn-2%Al-2%Mg shows that no oxide slag exists after remelting.Through the analysis of alloy ingot from transverse and longitudinal sampling,it is found that the transverse segregation of aluminum and magnesium is small,and the longitudinal segregation is about 0.1%.This paper provides a description on the detailed process and technological parameters of Zn-Al-Mg alloy preparation experiment,with an expectation to serve as a reference for researchers in this field.

关 键 词：锌铝镁合金 热镀锌 工频感应炉 组织结构 Zn-2%Al-2%Mg Zn-5%Al-5%Mg 成分偏析 生产制备 

分 类 号：TF125.21[冶金工程—粉末冶金]