Fe对Al-Zn-Mg-Si熔融镀液中Cr含量的影响  

Influence of Fe on Cr content in Al-Zn-Mg-Si molten bath

作　　者：金鑫焱[1,2] 任玉苓 林传华[3] 王凯[1,2] JIN Xinyan;REN Yuling;LIN Chuanhua;WANG Kai(Baosteel Central Research Institute,Shanghai 201999,China;State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel),Shanghai 201999,China;Baosteel Cold Rolling Plant,Shanghai 200941,China)

机构地区：[1]宝山钢铁股份有限公司中央研究院,上海201999 [2]汽车用钢开发与应用技术国家重点实验室(宝钢),上海201999 [3]宝山钢铁股份有限公司冷轧厂,上海200941

出　　处：《有色金属科学与工程》2023年第5期633-640,共8页Nonferrous Metals Science and Engineering

摘　　要：以55%Al-Zn-2%Mg-1.6%Si熔融镀液为研究对象,在热镀锌模拟设备锌锅中研究了添加Cr和Fe的实验过程中,Fe对镀液中Cr含量的影响。结果表明,当镀液温度为630℃时,随着Al-10Cr中间合金锭的添加,镀液中Cr含量逐渐升高,在含量约0.15%最终稳定达到饱和,超过其饱和溶解度将形成主要成分为Al-Cr的底渣。在Cr饱和的镀液中加入足量的钢板,镀液的饱和Fe含量约0.53%,而Cr含量由0.15%显著降至0.026%,镀液中形成了Al-(Fe,Cr)-Si金属间化合物,以底渣形式析出。相图计算结果进一步证实,提高Fe含量会降低55%Al-Zn-2%Mg-1.6%Si熔融镀液中Cr的饱和溶解度,从而促使Cr析出形成底渣。Dissolution experiments of Cr and Fe in 55%Al-Zn-2%Mg-1.6%Si molten bath were carried out in the zinc pot of a hot-dip galvanizing process simulator to study the influence of Fe on the Cr content in the molten bath.With a continuous addition of Al-10Cr master alloy ingot,the Cr content of the alloy bath reached a saturated content of 0.15%when the bath temperature was 630℃.Above its saturated solubility,bottom dross with the main component of Al-Cr will be formed.When enough steel sheet was added to the Cr-saturated molten bath,the saturated Fe content of the bath reached approximately 0.53%,while the Cr content decreased significantly from 0.15%to 0.026%.Al-(Fe,Cr)-Si intermetallic compounds with relatively high content of Cr,Fe and Si were formed in the bath,precipitated as bottom dross.The calculation results of the phase diagram further confirm that increasing Fe content of 55%Al-Zn-2%Mg-1.6%Si molten bath significantly reduces the saturated solubility of Cr in the alloy bath,resulting in the precipitation of Cr to form bottom dross.

关 键 词：Al-Zn-Mg-Si 熔融镀液 饱和溶解度 CR 底渣 

分 类 号：TG146.2[一般工业技术—材料科学与工程]