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采用自制的稀土中间合金,利用直读光谱仪、金相显微镜(OM)、扫描电镜(SEM)和电化学工作站,研究了稀土La,Ce对紫杂铜精炼前后的化学成分、微观组织、力学性能和耐蚀性能的影响,并探讨了稀土除杂的热力学机制与稀土精炼提高耐腐蚀性能的机制。实验结果表明,稀土La,Ce精炼后,紫杂铜中的Pb,Sn,S含量明显降低,Bi,Al等杂质含量也有不同程度的降低;加入0.15%稀土La,Ce精炼后,紫杂铜的铸态组织明显细化;稀土La,Ce与铜基体形成了球状的Cu6RE第二相粒子,弥散分布于铜基体中;适量稀土La精炼后,紫杂铜的力学性能有较大改善;加0.10%La和0.15%Ce精炼后的紫杂铜在3.5%的Na Cl溶液中的耐蚀性能有较大改善,自腐蚀电流由精炼前的8.58μA·cm~(-2)分别下降到4.59和6.20μA·cm~(-2)。
The effects of rare earth elements La and Ce on the chemical composition, microstructure and mechanical properties before and after purification of purpurite were studied by direct reading spectrometer, optical microscope (OM), scanning electron microscope (SEM) and electrochemical workstation. And corrosion resistance, and discussed the rare earth impurity removal mechanism of thermodynamics and rare earth refining to improve the corrosion resistance mechanism. The experimental results show that the contents of Pb, Sn and S in purple copper are significantly decreased and the contents of impurities such as Bi and Al are decreased to some extent after the rare earth La and Ce are refined. After adding 0.15% rare earth La and Ce, The microstructure of the as-cast microstructure is obviously refined. The spheroidal Cu6RE second-phase particles are formed on the rare-earth La, Ce and copper matrix and dispersed in the copper matrix. The corrosion resistance of purple copper doped with 0.10% La and 0.15% Ce in 3.5% NaCl solution has been greatly improved, and the corrosion current decreased from 8.58μA · cm -2 before refining to 4.59% And 6.20μA · cm -2.