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采用二步重熔法制备了不同Pr含量的Pb-Pr合金阳极材料,通过材料力学性能测试、阳极腐蚀测试研究了稀土元素Pr对Pb-Pr合金阳极抗拉强度、耐腐蚀性的影响,并利用循环伏安曲线(CV)和线性极化曲线研究了Pr对Pb-Pr合金阳极电化学行为的影响。研究结果表明:合金抗拉强度随Pr含量增大而增大,当合金中Pr含量达到2.0%(质量分数)时,合金抗拉强度为21.1 MPa,较纯Pb抗拉强度提高了85.1%;稀土元素Pr添加量在1.0%以下时不会对铅基阳极腐蚀性能产生明显影响,当Pr添加量超过1.0%时,Pr的添加使得恒流极化时阳极生成的Pb O2膜层疏松、多孔,降低了铅基合金的耐腐蚀性,当合金中Pr含量达到2.0%时,腐蚀速率提高到13.78 g·cm-2·h-1,较纯Pb(13.10g·cm-2·h-1)提高了5.19%;稀土元素Pr能降低合金电极稳定电位,且电位值随稀土元素含量的增加而减小,Pr含量达到2.0%时,阳极稳定电位约为2.190 V,与纯铅阳极稳定电位(2.314 V)相比下降5.4%。
Pb-Pr alloy anode materials with different Pr contents were prepared by two-step remelting method. The effects of rare earth Pr on the tensile strength and corrosion resistance of Pb-Pr alloy anode were studied by mechanical properties test and anode corrosion test. The effect of Pr on the electrochemical behavior of Pb-Pr alloy anode was investigated by cyclic voltammetry (CV) and linear polarization curves. The results show that the tensile strength of the alloy increases with increasing Pr content. When the content of Pr reaches 2.0% (mass fraction), the tensile strength of the alloy is 21.1 MPa, which is 85.1% higher than the pure Pb. When the content of rare earth element Pr is less than 1.0%, the corrosion performance of lead-based anode will not be significantly affected. When the content of Pr exceeds 1.0%, the addition of Pr makes the anode layer of Pb O2 film loose at the constant current polarization, , The corrosion resistance of lead-based alloy was reduced. When the content of Pr in the alloy reached 2.0%, the corrosion rate increased to 13.78 g · cm-2 · h-1 and that of pure Pb (13.10g · cm-2 · h-1 ) Increased 5.19%. The rare earth element Pr reduced the stable potential of the alloy electrode, and the potential value decreased with the increase of rare earth element content. When the content of Pr reached 2.0%, the stable potential of the anode was about 2.190 V, (2.314 V) compared to 5.4%.