将TiO_2和CeO_2颗粒添加到由50 g/L PbO和4 mol/LNaOH组成的镀液中,通过阳极电沉积的方法在铝基体上制备了α-PbO_2-TiO_2-CeO_2复合镀层,用作铝基二氧化铅电极的中间层.通过研究镀液中固体颗粒的质量浓度和各种工艺条件对α-PbO_2-TiO_2-CeO_2复合镀层外观及结合力的影响,确定了最佳配方和操作条件为:TiO_2 15 g/L,CeO_2 10g/L,温度40℃,电流密度0.5 A/dm~2,电沉积时间3 h.在此条件下所得的复合镀层综合性能较好,其TiO_2和CeO_2含量(质量分数)分别为3.77%和2.13%.扫描电镜结果显示,固体颗粒的掺杂能抑制α-PbO_2晶胞的长大,起到细化晶粒的作用.X射线衍射分析表明,固体颗粒的加入改变了α-PbO_2镀层晶粒的择优取向,降低了其衍射峰强度.
An α-PbO_2-TiO_2-CeO_2 composite was prepared on aluminum substrate by anodic electrodeposition from a 50 g/L PbO + 4 mol/L NaOH bath containing TiO_2 and CeO_2 particles, which is used as the interlayer for Al-based PbO_2 electrode. Based on the study of the effects of mass concentrations of solid particles and various process parameters on the appearance and adhesion of the composite, the optimal bath formulation and operation conditions were obtained as follows: TiO_2 15 g/L, CeO_2 10 g/L, current density 0.5 A/dm~2, temperature 40 ℃ and electrodeposition time 3 h. Under these conditions, the composite contains 3.77wt% TiO_2 and 2.13wt% CeO_2 and has good comprehensive performance. The scanning electron microscopic image indicates that the doping of particles restrains the growth of α-PbO_2 cell and refines crystal grains. The analysis of X-ray diffraction shows a change of preferred orientation of α-PbO_2 crystal grains and a decline in diffraction intensity of α-PbO_2 after doping solid particles.
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