在电解二氧化锰体系中,使用的阳极板通常具有易变型,电流密度低,电耗高等缺点.为了解决这些问题,文中选用工业纯钛作为基体,二氧化锰和二氧化锡作为复合活性涂层,采用简易的热分解方法制备出钛基复合涂层阳极.通过SEM测试涂层表面形貌,发现该阳极的涂层致密、呈较平整的层状.采用循环伏安曲线测试并计算积分面积和极化曲线对涂层配方进行研究,发现烧结温度为450℃,锡/锰比为6∶4时的阳极性能最优.与铅阳极和铅银合金阳极对比,用该复合涂层阳极电解得到的二氧化锰纯度更高,但其槽压比其它阳极低了约0.2 V左右,电流效率得到了提高,从而节约了电解过程中的能耗.因此,该复合涂层阳极适合做大型电极的阳极板.
Anode plates have some disadvantages in the electrolysis,such as easy distortion,low current density,high power consumption,et al.In order to solve these problems,the composite coating of MnO2 and SnO2 was prepared on titanium anode by a simple thermal decomposition method.The surface morphology of the composite coating was characterized by SEM.Results show that the coating is dense and smooth with a layer structure.The properties of composite coating are studied by testing the polarization curve,cyclic voltammetry curves and calculating the voltammetry curve integral area.It is showed that the optimum coating is Sn/Mn with a ratio 6 ∶ 4 sintering at 450 ℃.The composite coating anode has much obvious advantages,compared with lead anode,lead silver alloy anode and the titanium anode.Higher purity MnO2 has obtained by using the composite coating anode.The voltage is reduced about 0.2 V improved the current efficiency.Therefore,the composite coating anode is suitable for the anode plate of large electrodes.
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