典型表面活性物质在汞、镉汞齐和铅汞齐电极上的吸附行为

本文采用DD-1型电镀参数测试仪,测定了汞、镉汞齐和铅汞齐电极在1MKCl的基底溶液中,四下基碘化铵等十二种典型有机表面活性物质在三种电极上的脱附电位。由于镉汞齐和铅汞齐电极的阳极溶解电位比较负,未观测到F^-、Cl^-、Br^-离子的吸附现象。I^-离子及同一有机表面活性物质在三种电极上的吸附活性顺序为:Hg>Pb(Hg)>Cd(Hg)。测试结果表明:同浓度的同一种表面活性物质,在三种电极上的脱附峰电位值之差小于10mV。反映了镉汞齐和铅汞齐电极在脱附峰电位时的表面性质接近于纯汞。

The Adsorption Behaviors of Typical Surface-Active Substances on Hg,Cd(Hg) and Pb(Hg) Electrodes

The interfacial capacity-potential curves of Hg,Cd(Hg)and Pb(Hg)electrodes and the desorption potentials" on the three electrodes in₁₂ typical surface-active organic substances in₁M KC₁ were measured by DD-1 typle electroplate parameter measurement meter.As anodic soluble potentials of Cd(Hg)and Pb(Hg)electrodes are more negative,the desorptions F^-,Cl^-,Br^-were not found.It was found that the sequence of surface activities of I-and the surface activities of same surface-active substances on the three electrodes usually follow Hg>Pb(Hg)>Cd(Hg).Given results show.The difference of desorption potentials on the three electrodes in same concentration and same surface-active substances was less 10mV.It was showed that the surface characters of Cd(Hg)and Pb(Hg)at the desorption potentials were as same as that of Hg.