Ag和RE含量对Pb-Ag-RE合金阳极电化学性能的影响

发布时间：2018-08-06 17:54

【摘要】：采用恒流极化、计时电位、塔菲尔曲线、扫描电子显微镜(SEM)和X射线衍射(XRD)对比研究不同Ag和RE含量Pb-Ag-RE合金阳极的析氧行为和腐蚀行为。结果表明:减少Ag含量将导致阳极析氧过电位升高,阳极的腐蚀速率增大。RE的加入有利于促进高阻抗成分Pb SO4、Pb O向α-Pb O2和β-Pb O2转化,进而提高阳极的析氧活性,降低阳极电位。此外,RE可以提高氧化膜的致密度,细化Pb-Ag合金的晶界和枝晶界,减轻合金基底的晶间腐蚀。因此,RE可以有效改善Pb-Ag合金阳极的析氧活性和耐腐蚀性能,微量的RE可以部分取代Pb-Ag阳极中的Ag。
[Abstract]:The oxygen evolution and corrosion behavior of Pb-Ag-RE alloy anode with different Ag and RE contents were studied by means of constant current polarization, chronopotentiometry, Tafel curve, scanning electron microscope (SEM) (SEM) and X-ray diffraction (XRD). The results show that the reduction of Ag content leads to the increase of anodic oxygen evolution overpotential, and the increase of anodic corrosion rate. The addition of RE can promote the conversion of Pb so 4 O 4 O 4 to 伪 -Pb O 2 and 尾 -Pb O 2, thus increase the oxygen evolution activity of the anode and decrease the anode potential. In addition, RE can increase the density of the oxide film, refine the grain boundary and dendrite boundary of Pb-Ag alloy, and reduce the intergranular corrosion of the alloy substrate. Therefore, the oxygen evolution activity and corrosion resistance of Pb-Ag alloy anode can be effectively improved by RE. Trace RE can partially replace Ag in Pb-Ag anode.
【作者单位】：中南大学冶金与环境学院;中南大学难冶有色金属资源高效利用国家工程实验室;
【基金】：国家“十二五”科技支撑计划课题(2012BAA03B04) 国家自然科学基金资助项目(51204208,51374240) 湖南省自然科学基金资助项目(13JJ1003) 第54批博士后科学基金资助项目(2013M540638)
【分类号】：TG146.33

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