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Development and Characteristics of Titanium Anode Materials

Nov. 19, 2021

Cathodic protection technology, as a metal corrosion protection measure, has been widely used in metallurgy, chemical industry, environmental protection and corrosion prevention. Cathodic protection is divided into sacrificial anode protection method and impressed current protection method. With the rise of MMO titanium anodes, the development of technology and the requirements of environmental protection, the impressed current protection method has been rapidly developed in developed countries at the end of the 20th century.

Titanium anode is the core part of external cathodic protection and has strict requirements on electrode performance because the soil usually contains SO42-, CO32-, OH-, Cl-, H+, etc.. This requires both oxygen and chloride evolution during the electrolysis process. Conventional electrodes can generally be divided into oxygen evolution electrodes and chlorine evolution electrodes. They can show excellent service performance in independent oxygen evolution or chlorine evolution electrochemical reactions, but their service performance is not satisfactory for the complex environment of mixed system of oxygen and chlorine evolution like cathodic protection.

iridium-ruthenium coated titanium anode

Di Noer technology Co., Ltd changed the preparation process of the traditional titanium anode greatly improves the performance, reduces the evolutionary potential of oxygen and chlorine, and greatly improves the service life of the electrode. Due to the use of titanium as the substrate, it is easy to process and shape, light weight, bringing convenience to handling and installation. Since the electrode surface is covered by an oxide layer with high catalytic activity, the potential of the titanium substrate exposed at some defects on the surface usually does not exceed 2 volts, so the titanium substrate does not produce breakdown damage to the surface passive film. The mixed metal oxide anode also has excellent physical, chemical and electrochemical properties. The coating has a resistivity of 10-7 Ω. M, is highly resistant to acidic environments, has low polarization and a very low consumption rate. By adjusting the composition of the oxide layer, it can be applied to different environments, such as seawater, freshwater and soil.

As a special functional material, the electrode material not only involves the energy consumption of the reaction, but also directly affects the yield and product of the reaction. The nature of the electrode material has a great influence on the whole pathway and selectivity of the electro-synthetic reaction, which is both the catalyst and the site where the electrode reaction is carried out. Therefore, the study of electrode materials becomes the key to the research of organic electrosynthesis. Electrode materials need to have the following characteristics.

①good electrical conductivity.

②good electrocatalytic properties and selectivity.

③Excellent chemical properties and corrosion resistance.

④ A certain mechanical strength and easy processing and molding.

⑤ Low price.

In the actual organic electrochemical system, it is extremely difficult to fully meet the above requirements, so various factors must be taken into consideration when selecting electrode materials.

Lead dioxide titanium electrode

The anode material is much smaller than the cathode material, but it is easier to make a choice because the anode material plays the role of auxiliary electrode in the electric reduction of the cathode. Available anode materials are: lead alloy, lead, titanium-based ruthenium oxide, titanium-based tantalum-iridium oxide, graphite, copper, stainless steel, etc.  Please feel free to send us a message and get the quote.