Ce添加对Zn-0.6Cu-0.3Ti合金组织与耐蚀性能的影响  

Effect of Ce on Microstructure and Corrosion Resistance of Zn-0.6Cu-0.3Ti Alloy

作　　者：倪雅[1] 施方长 戚继球[2] NI Ya;SHI Fangchang;QI Jiqiu(Jiangsu CUMT Dazheng Surface Engineering Technology CO.,Ltd.,Xuzhou 221000,China;School of Materials and Physics,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]江苏中矿大正表面工程技术有限公司,徐州221000 [2]中国矿业大学材料与物理学院,徐州221116

出　　处：《中国腐蚀与防护学报》2023年第4期803-811,共9页Journal of Chinese Society For Corrosion and Protection

摘　　要：将稀土Ce添加到Zn-0.6Cu-0.3Ti合金中,设计熔炼Zn-0.6Cu-0.3Ti-(0.3~0.6)Ce系列合金,采用X射线衍射仪(XRD)、扫描电镜(SEM)、电化学腐蚀测试等研究了Ce添加对Zn-0.6Cu-0.3Ti合金组织与耐蚀性能的影响。结果表明,添加稀土Ce后,Zn-0.6Cu-0.3Ti合金中析出CeZn5微米颗粒,其分布于Zn基体内部或者相界面处,促进Zn基体以枝晶方式生长,并细化Zn枝晶和二次枝晶。Ce的添加在整体上提高了Zn-Cu-Ti合金的自腐蚀电位,降低合金的自腐蚀电流密度,添加0.3%Ce后,Zn-0.6Cu-0.3Ti合金的自腐蚀电流从2.76×10^(-3)A/cm^(2)快速降低到5.85×10^(-4)A/cm^(2),腐蚀时间越长,Ce含量对Zn-Cu-Ti-Ce合金腐蚀性能的影响越弱。含Ce合金阻抗谱只有一个容抗弧,在腐蚀初期,Ce含量对容抗弧半径影响较小,随着腐蚀时间的延长,Ce的影响越来越明显,总体呈增大趋势。A series of cast Ce-containing Zn-alloys Zn-0.6Cu-0.3Ti-(0.3-0.6)Ce was prepared,and the effect of Ce addition on the microstructure and corrosion resistance of Zn-0.6Cu-0.3Ti alloy were investigated by means of X-ray diffractometer,scanning electron microscope and electrochemical corrosion test.The results showed that due to the addition of the rare earth Ce,CeZn5 micron particles emerged in the alloys,which were distributed inside the Zn matrix or at phase boundaries,promoting the growth of the Zn matrix as dendrites and refining the Zn dendrites and secondary dendrites.Correspondingly,the free-corrosion current density of Zn-0.6Cu-0.3Ti alloy decreased rapidly from 2.76×10^(-3)A/cm^(2)to 5.85×10^(-4)A/cm^(2)after the doping of 0.3%Ce.The effect of Ce content on the corrosion properties of Zn-Cu-Ti-Ce alloy becomes weaker as the corrosion time increases.The impedance spectra of the alloy containing Ce has only one capacitive arc,in the early stage of corrosion,the influence of Ce content on the radius of the capacitive arc is small,with the extension of corrosion time,the influence of Ce becomes more and more obvious,and the overall trend is increasing.

关 键 词：Zn-Cu-Ti合金和涂层 Ce添加 组织特征 腐蚀性能 

分 类 号：TG174[金属学及工艺—金属表面处理]