采用线性电位扫描法、电位阶跃法,结合交流阻抗跟踪对铅在4.5mol·dm~(-3)H_2SO_4中-0.6V(vs.Hg/Hg_2SO_4/4.5mol·dm~(-3)H_2SO_4)极化20min形成的阳极硫酸铅膜的阴极还原进行研究.实验结果表明该膜大部分能被还原,其中的硫酸铅颗粒先在表面按扩散控制下的三维瞬时成核与生长机理被还原,然后Pb~(2+)自颗粒内径向扩散至已生成的铅层表面上进行还原.颗粒中微粒间的液膜为离子输运的主要途径. The potential of Pb in 4.5 mol · dm -3 H_2SO_4 -0.6V (vs.Hg_2SO_4 / 4.5 mol.dm -3 H_2SO_4) was investigated by linear potential sweep method and potentiometric step method with AC impedance. The cathodic reduction of anode lead sulfate film formed by polarization for 20min was studied.The experimental results show that most of the film can be reduced, and the lead sulfate particles are firstly reduced on the surface by the three-dimensional instantaneous nucleation and growth mechanism under diffusion control, and then Pb ~ (2+) diffuses radially from the inside of the particles to the surface of the formed Pb layer, and the liquid film between the particles in the particles is the main route of ion transport.