Titanium alloy anode for electrolyzing manganese dioxide and its making process

Abstract

The titanium alloy anode for electrolyzing manganese dioxide consists of Mn not more than 9 wt%, Cr not more than 9 wt%, Ni not more than 55 wt%, Al not more than 6 wt%, Sn not more than 6 wt%, Zr not more than 6 wt%, B not more than 0.5 wt%, RE not more than 0.5 wt%, and Ti and inevitable impurity for the rest, and is made through mixing the materials, smelting in an arc furnace, casting, producing into wire and assembling into netted consumable anode. The anode is used for electrolyzing manganese dioxide, and has high inactivation resistance, capacity of maintaining the tank voltage within3.3 V in the current density of 100 A / sq m and under normal industrial electrolysis condition and high adhesion of product.

Description

technical field [0001] The invention relates to an anode, in particular to a titanium alloy anode material used in the production of electrolytic manganese dioxide and a manufacturing method for its structural assembly. Background technique [0002] Since manganese dioxide, the active material of zinc-manganese batteries, has been produced by electrolysis, the anode materials used in electrolysis have made great progress from graphite and lead to industrially pure titanium. The quality has improved by leaps and bounds, and it is clear that titanium has its unique advantages as an insoluble anode. However, pure titanium has an inherent passivation tendency as an anode, and passivation will occur at a slightly higher current density or lower electrolyte temperature, resulting in an increase in cell voltage and power consumption, so that electrolysis cannot continue. For this reason, people have adopted various methods to try to overcome the passivation tendency of pure titani...

AI Technical Summary

Problems solved by technology

However, pure titanium has an inherent passivation tendency as an anode, and passivation will occur at a slightly higher current density or lower electrolyte temperature, resulting in an increase in cell voltage and power consumption, making it impossible to continue electrolysis

For this reason, people have adopted various methods to try to overcome the passivation tendency of pure titanium, such as chemically treating the surface of titanium anodes, drilling holes, coating precious metals, and vacuum infiltrating anti-passivation elements on the surface of the anode to achieve anti-passivation. effect, but most of them have not achieved industrial application, and some have industrial application but the effect is not ideal

Recently, people have begun to explore the use of alloying methods to make anti-passivation titanium alloys. Among them, the Ti-Mn-Cr-Fe quaternary anti-passivation titanium alloy of Shanghai Iron and Steel Research Institute has been successfully applied in China's electrolytic manganese dioxide industry. A large number of applications have been carried out (Chinese Invention Patent No. 91107417.1, U.S. Invention Patent No. 5.733.428); however, the anode still has insurmountable defects, that is, the welding performance of the alloy is not good, and the welding and assembly of large anodes cannot be performed. The manufacturing process is difficult to control, which affects the mass production of large sheets and hinders larger-scale industrial applications; at the same time, the anode still has a tendency to increase the cell voltage after long-term use

In terms of anode assembly structure, except for the titanium alloy anode invented by Fang Pingwei et al., which adopts a strip structure with special-shaped cross-section, all titanium anodes used in industrial applications use flat perforated or corrugated plate structures. The former can overcome the cracking and delamination of manganese dioxide products. problems, and the latter still has product cracking and delamination, which causes fluctuations in the cell voltage and deteriorates product quality

For this reason, many scientific research institutions, manufacturers and people of insight have continuously developed and researched, but there is no better improvement method so far.

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