Preparation method of titanium-based anode surface composite coating for electrolytic manganese dioxide

Abstract

The invention discloses a preparation method of a titanium-based anode surface composite coating for electrolytic manganese dioxide. The preparation method comprises the following steps: sequentially carrying out polishing, alkali washing and etching treatment on an industrial pure titanium sheet; then fully mixing a tin tetrachloride ethanol solution with a manganese nitrate ethanol solution according to a molar ratio that Sn : Mn = 6 : 4, thus preparing a coating mixed solution; painting the titanium sheet, and putting and drying the painted titanium sheet in a drying oven of which the temperature is 70 to 90 DEG C for 10 to 30 minutes; then calcining the dried titanium sheet on an electric furnace for 1 to 20 minutes, taking the titanium sheet out of the electric furnace after ending the calcination, and naturally cooling under a room temperature; finally, naturally cooling to the room temperature after putting and sintering the titanium sheet in a muffle furnace under 400 to 600 DEG C for 1 hour, and repeating the operation for 2 to 4 times, thus obtaining the titanium-based anode surface composite coating for the electrolytic manganese dioxide on the surface of the titanium sheet. According to the preparation method disclosed by the invention, the operation is simple, and the energy consumption is reduced; the prepared composite coating is dense and is in a rugged laminar shape; a titanium-based anode modified by the composite coating is applied to the electrolytic manganese dioxide, so that the voltage of an electrolytic tank can be effectively reduced.

Description

Technical field [0001] The invention belongs to the technical field of electrolytic anode surface composite coating, and particularly relates to a method for preparing a titanium-based anode surface composite coating for electrolytic manganese dioxide. Background technique [0002] In the electrolytic manganese dioxide industry, the speed, selectivity (direction), current efficiency, energy consumption and the quality of the final product electrolytic manganese dioxide have a greater impact on the electrolytic anode to electrode reaction. The anode is very constrained. In the electrolysis of manganese dioxide, for anode materials, due to the oxidation reaction at the anode and the usually harsh reaction conditions, it is easy to cause anode loss, and the electrode is required to have electrochemical catalytic performance for the deposited manganese dioxide, and has a lower overpotential And lower cell pressure, so the choice of anode material is one of the problems in the electr...

AI Technical Summary

Problems solved by technology

The coated anode used earlier was manganese dioxide-modified titanium-based anode. This anode has certain disadvantages: the surface of the manganese dioxide coating has many cracks and large porosity. After a period of use, the electrolyte will penetrate the active layer and Matrix reaction to generate TiO 2 The middle layer, which leads to the increase of anode resistance and the passivation of the anode

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