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在Pb-0.3%Ag合金基体表面制备了Pb-0.3%Ag/Pb-Co_3O_4复合惰性阳极材料,研究了不同正向脉冲平均电流密度(2-5A·dm~(-2))和镀液中Co_3O_4颗粒浓度(10-40 g/L)下制备的复合惰性阳极材料电化学性能,在50 g·L~(-1)Zn~(2+),150 g·L~(-1)H_2SO_4,35℃溶液中测试了阳极极化曲线、循环伏安曲线和塔菲尔曲线,获得了析氧动力学参数、伏安电荷、腐蚀电位和腐蚀电流。结果表明:在3 A/dm~2正向脉冲平均电流密度和30 g/LCo3O4颗粒浓度下制备的Pb-0.3%Ag/Pb-Co_3O_4复合惰性阳极材料具有较高的电催化活性,较低的析氧过电位,较好的电极反应可逆性和耐腐蚀性。在500 A/m~2测试电流密度下的析氧过电位为0.891 V,比Pb-1%Ag合金降低280 mV;伏安电荷q~*为0.725 C·cm~(-2),比Pb-1%Ag合金提高26.5%;腐蚀电流也明显低于Pb-1%Ag合金。复合惰性阳极材料活性表面积大,活性物质数量多提高了在[ZnSO_4+H_2SO_4]溶液中的析氧电催化活性。沉积层晶粒细小而均匀,组织结构致密,真实表面缺陷少提高了耐腐蚀性。
Pb-0.3% Ag / Pb-Co_3O_4 composite inert anode materials were prepared on the surface of Pb-0.3% Ag alloy substrate. The effects of different forward pulse average current densities (2-5A · dm -2) The electrochemical performance of the composite inert anode materials prepared under the condition of Co_3O_4 particle concentration (10-40 g / L) was studied under the conditions of 50 g · L -1 Zn 2+, 150 g · L -1 H 2 SO 4, The anodic polarization curves, cyclic voltammetry curves and Tafel curves were tested in 35 ℃ solution. The kinetic parameters of oxygen evolution, voltammetric charges, corrosion potential and corrosion current were obtained. The results show that Pb-0.3% Ag / Pb-Co_3O_4 composite inert anode materials prepared at an average forward current density of 3 A / dm ~ 2 and a particle concentration of 30 g / L of CO 3 have higher electrocatalytic activities, Oxygen evolution potential, better electrode reversibility and corrosion resistance. The oxygen evolution overpotential was 0.891 V at 500 A / m 2 test current density, 280 mV lower than that of Pb-1% Ag alloy. The voltammetric charge q ~ * was 0.725 C · cm -2, -1% Ag alloy increased 26.5%; corrosion current is also significantly lower than the Pb-1% Ag alloy. The composite inert anode material has a large active surface area and a large number of active materials which increase the oxygen evolution electrocatalytic activity in [ZnSO 4 + H 2 SO 4] solution. Sediment fine and uniform grains, dense microstructure, less real surface defects to improve corrosion resistance.