Effects of Samarium on the Properties of the Anodic Pb(Ⅱ) Oxides Film Formed on Pb in Sulfuric Acid Solution

摘要

The effects of samarium on the properties of the anodic Pb(Ⅱ) oxides films formed on lead at 0.9 V (vs. Hg/Hg_2SO_4) in 4.5 mol/L H_2SO_4 solution were studied using linear sweep voltam-metry (LSV), electrochemical impedance spectroscopy (EIS) and scanning electron micrographs (SEM). The experimental results show that adding Sm to lead metal can inhibit the growth of the Pb(Ⅱ) oxides film effectively, and reduce the resistance of the PbO oxides film obviously. The addition of Sm increases the porosity of the anodic film, which may cause the increase of the ionic conductance produced by the interstitial liquid among the PbO particles in the film and lead to the decrease of the resistance of the anodic film.