Method for surface pre-treatment of titanium electrode substrate

Abstract

The invention belongs to the field of metal material and relates to a method for surface treatment of a titanium electrode substrate. The service life and the electrocatalysis performance of the titanium electrode are greatly increased by the abrasive blasting pretreatment to the substrate. The abrasive blasting treatment is carried out on the titanium substrate; the nozzle pressure of an abrasive blasting machine is 0.3-0.5MPa; the Al2O3 grinding medium of 70-90 meshes is adopted; the blasting angle is 45-90 degrees; the distance from the nozzle to a workpiece is 1-2cm; the coarsening time is 15-30s; the titanium substrate is then pickled for pickling treatment in a 10wt.% of oxalic acid solution for 1.5-2.5 hours at the temperature of 90-95 DEG C; a Ti/IrO2.Ta2O5 oxide coating electrode is prepared on the obtained substrate by a thermal decomposition method, wherein the Ir is chloro-iridic acid, Ta is tantalum pentachloride and the molar ratio of Ir to Ta is 7:3; a coating solution is uniformly coated on the pre-treated titanium substrate by a soft hair brush; the titanium substrate is dried for 10min at the temperature of 120 DEG C, is subsequently arranged in a box-type resistance furnace and sintered for 10min at the temperature of 450 DEG C; the above operations of coating, drying and sintering are repeatedly carried out by 5-20 times; and the final sintering is carried out for 1h at the temperature of 450 DEG C. The method provides optimum pretreatment parameters, greatly prolongs the service life of the titanium electrode, effectively improves the electrocatalytic activity and greatly reduces the running and repairing cost for the electrode.

Description

Technical field: [0001] The invention belongs to the field of metal materials, and relates to a method for pretreating the surface of a titanium electrode substrate. The service life and electrocatalytic performance of the titanium electrode are greatly increased through the sandblasting pretreatment of the substrate. Background technique: [0002] In recent years, Ti-based IrO 2 -Ta 2 o 5 Due to their excellent electrocatalytic activity and electrochemical stability, the electrode has been widely used in the electrolysis industry with strong corrosion and harsh working environment. Oxygen evolution catalytic activity and its own electrochemical stability, that is, service life, are two important performance indicators of titanium anodes, and both are indispensable. In order to improve the performance of oxide anodes, the tight bonding between the coating and the base metal is an important factor. Therefore, before the oxide anodic coating, the substrate must be subjecte...

AI Technical Summary

Problems solved by technology

However, Ir and Ta are precious metals and are expensive, so the significance of improving their electrocatalytic activity and service life is self-evident

From the above analysis, the sandblasting pretreatment of the substrate has a very important impact on the life of the obtained electrode, but from the current literature, there is no data on the impact of the sandblasting process parameters on the service life of the titanium electrode. The impact of the electrocatalytic activity of the titanium electrode and the optimal parameters of the titanium substrate sandblasting pretreatment are blank. Therefore, a large number of reports in the literature have shown that the service life of the iridium-tantalum-coated titanium electrode with the substrate pretreated by sandblasting and the interaction between the catalytic activity are not comparable

Images