铋对铅铋合金表面氧化膜生成的影响

Effect of Bisthum on The Formation of Lead Oxide on Pb-Bi Alloys

采用线性电位扫描(LSV)、电镜扫描(SEM)、交流阻抗(AC)及电感耦合等离子体原子发射光谱(ICP)测试技术研究了铅电极和不同铋含量的铅铋合金电极在硫酸溶液中氧化膜的生成情况。由恒电位0.9 V 20 m in后的线性电位扫描伏安曲线中PbO+PbO.PbSO4和PbSO4还原电量可知,铅(Ⅱ)氧化膜生成量在铋质量分数低于0.103%时不受铋含量的影响,但铋含量较高时,随铋含量增加而增长;由电阻与电位的关系曲线可知,铋含量较高时,随铋含量增加,氧化膜电阻减小,电导增强;在1.6 V恒电位20 m in后的线性电位扫描伏安曲线表明,铋对PbO2的生成影响规律与铅(Ⅱ)氧化膜的相同;电镜扫描显示,生成的氧化膜随铋含量增长,结构更加疏松;ICP分析表明,不同含量铅铋合金电极中铋溶出量,随铋含量增加而增加。

The formation of lead oxide, mono-oxide and dioxide, on Pb-Bi alloys in sulfuric solution was studied by means of linear sweeping vohammetry（ LSV）, scan electron spectroscopy（SEM） , AC vohammetry and inductively coupled plasma atomic emission spectrum （ICP）. The results obtained by LSV after applying a potential at 0.9 V for 20 min show that bismuth content lower than 0. 103% in the alloys does not affect the formation of mono-oxide, but it will accelerate the formation of the mono-oxide when its content in the alloys is higher. Z＇ versus E curves indicate that the conductance increases with bismuth content increasing; similar behavior for the effect of bismuth on the formation of dioxide as that of mono-oxide can be found from the results obtained by LSV after applying a potential at 1.6 V for 20 min. It is shown by SEM that the oxides have more pores on the alloys with high bismuth content. It is found from ICP analysis that the stripping amount of bismuth in the alloys increases with bismuth content increasing.