Al含量对热镀锌−铝合金镀层组织结构的影响  

Effect of aluminum content in zinc bath on microstructure of hot-dipped Zn-Al alloy coating

作　　者：金永清 郭太雄[2] 董学强[2] 周兵 JIN Yongqing;GUO Taixiong;DONG Xueqiang;ZHOU Bin(Cold Rolling Plant of Panzhihua Steel&Vanadium Co.,Ltd.,Panzhihua 617000,China;Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,China)

机构地区：[1]攀钢集团攀枝花钢钒有限公司冷轧厂,四川攀枝花617000 [2]攀钢集团研究院有限公司,四川攀枝花617000

出　　处：《电镀与涂饰》2023年第10期18-23,共6页Electroplating & Finishing

摘　　要：在改良森吉米尔法热镀锌机组上采用Al质量分数分别为8%、10%、12%和15%的镀浴,制备了Zn-Al合金镀层,利用扫描电镜(SEM)和能谱仪(EDS)分析了它们的微观组织结构。结果表明,Zn-Al合金镀层由先共晶富Al相和Zn-Al二元共晶组织组成,其中二元共晶组织由富Al相和富Zn相组成。随着镀浴中Al质量分数增大,Zn-Al合金镀层的先共晶富Al相的含量增大,枝晶变粗、变多,逐渐转变为网络结构;Zn-Al二元共晶组织的占比则减少,逐渐由网格状变为细条状。Zn-Al alloy coatings were prepared in a zinc bath with a mass fraction of Al 8%,10%,12%,and 15%respectively on a modified Semgemir hot-dipping line.The microstructures of the Zn-Al alloy coatings were analyzed using scanning electron microscope(SEM)and energy-dispersive spectrometer(EDS).The results showed that all of the prepared Zn-Al alloy coatings were composed of pre-eutectic Al-rich phase and Zn-Al binary eutectic,the latter of which consisted of Al-rich phase and Zn-rich phase.With the increasing of Al content in zinc bath,the proportion of pre-eutectic Al-rich phase in Zn-Al alloy coating was increased,the dendrite in it became more and larger,and gradually transferred to be a network structure,while the proportion of Zn-Al binary eutectic structure was decreased and changed from grid shape into thin strip.

关 键 词：热浸镀 锌−铝合金 铝含量 微观结构 共晶组织 

分 类 号：TQ153.2[化学工程—电化学工业]