Effect Of Coating Thickness On Electrochemical Properties Of Ru-Ir-Ti And Ta-Ir-Ti Metal Oxide Anode

With the development of Electrochemical which widely used in Electrolysis,Cathodic protection and Chlor-alkali industry,people never stop to find the anode with high-performance. The anode material with mixed metal oxides of Ru-Ir-Ti and Ta-Ir coated titanium revealing themselves with their excellent electrochemical activity and stability. This research devoted to use micro analysis to study the structure law of mixed metal oxides coating, use electrochemical method to study the electrochemical characteristics and accelerated life of the coating. Finally determined the range of the layer numbers which is effectively and economically.In the process of research producing the anode material with mixed metal oxides of Ru-Ir-Ti and Ta-Ir coated titanium with different layer numbers by pyrolysis method. The proportion of the major element is Ru:Ir: Ti(3:4:3,Ir:Ta(7:3).Use SEM and EPMA to study the microstructure, the element distribution rule and the variation of different coating layer thickness. By the test of chlorine and oxygen evolution potential, current efficiency, CV, EIS and accelerated life test in order to study the electrochemical activity and durability of the coating.The results showed that the thickness of coating increasing with the coating layers. Besides the Ru-Ir-Ti coating which has been coated 40 layers has a poor binding force and the structure of the surface is bad, all of the coating has a crack but structured surface, the structure of the coating is stable. The element distribution of the Ru-Ir-Ti coating show that ruthenium enrichment near the matrix in another hand iridium segregated on the surface. The element of the Ta-Ir coating is well distributed.By the study of electrochemical properties the research found that as the Ru-Ir-Ti coating got its longest accelerated life when layer number is 30, the Ta-Ir coating got its longest accelerated life when the layer number is 40.Exept the Ru-Ir-Ti coating which has been coated 40 layers, all of the coatings'chlorine evolution potential, oxygen evolution potential, current efficiency are similar. When the layer number of the two kinds of coating is 20 they show their best electrochemical characteristics. In the process of this research we inferred a range of layer number, in which the two kinds of coating can consideration to long accelerated life and better electrochemical characteristics. In the actual production process, you can create anode between the range of coating layers, which will help improve the effectiveness and economically of metal oxide anode.