Gd对有色金属电积用铅基阳极性能的影响

Influence of Gd on properties of Pb based anode for nonferrous electrowinning

采用二步重熔法制备不同Gd含量的Pb-Gd合金材料,采用抗拉强度测试、阳极失重法研究Gd对Pb-Gd合金力学性能和耐腐蚀性能的影响,并利用CV(循环伏安曲线)和XRD分析研究Gd含量对Pb-Gd合金阳极电化学性能及物相组成的影响。结果表明:合金抗拉强度随Gd含量的增大而增大,当Gd含量达到2.0%(质量分数)时,合金抗拉强度为19.1 MPa,比纯Pb的提高69.0%;添加Gd没有影响阳极表面氧化膜物相的基本组成,阳极的表面氧化膜主要由β-PbO2和PbO组成。稀土元素Gd能降低合金电极阳极稳定电位,且电位值随稀土元素含量的增加而减小。

The Pb-Gd alloy anodes with different Gd contents were prepared by two stage remelting method. The effects of Gd contents on the tensile strength and corrosion resistance of Pb-Gd alloy anodes were examined by mechanics performance and mass-loss method. The cyclic voltammetry curve (CV) and XRD were used to study the electrochemical behaviour and phase composition of the Pb-Gd alloy anode . The result show that the tensile strength of Pb-Gd alloy anode increase with increasing the Gd content, when Gd content is 2.0% (mass fraction), the tensile strength of Pb-Gd alloy anode reaches 19.1 MPa which increases by 69.0% comparing with that of pure Pb anode. Addition of Gd can not change the surface film of lead anode, its mainly composes ofβ-PbO 2 and PbO. But addition of Gd can reduce the anode steady potential, and the potential value decreases with increasing the rare earth metal content.