1. What is a titanium anode?
Titanium anode is the anode in titanium-based metal oxide coating. According to the different surface catalytic coatings, it has the function of oxygen evolution and chlorine evolution respectively. Generally, electrode materials should have good electrical conductivity, small change in pole distance, strong corrosion resistance, good mechanical strength and processing performance, long life, low cost, and good electrocatalytic performance for electrode reaction. At present, titanium is the most suitable for the above Metals with comprehensive requirements, generally use industrial pure titanium TA1TA2
The role of the metal oxide coating on the titanium anode is: low resistivity, good electrical conductivity (titanium itself has poor electrical conductivity), the chemical composition of the precious metal coating is stable, the crystal structure is stable, the electrode size is stable, and corrosion resistance It has good electrocatalytic performance, and is beneficial to reduce the overpotential of oxygen evolution and chlorine evolution reaction and save electric energy.
2. The anodes in the metallurgical industry are divided into soluble anodes and insoluble anodes.
The soluble anode plays the role of supplementing metal ions and conducts electricity during the electrolysis process, while the insoluble anode only plays the role of conducting electricity. The earliest insoluble anodes were graphite and lead-based anodes. In the 1970s, titanium anodes began to be used in electrolysis and electroplating as a new technology. At present, insoluble anodes can be divided into two categories: chlorine evolution anodes and oxygen evolution anodes. Chlorine evolution anode is mainly used in chloride electrolyte system. During the electroplating process, chlorine gas is released from the anode, so it is called chlorine evolution anode; During the process, oxygen is released from the anode, so it is called an oxygen evolution anode. Lead alloy anodes are oxygen-evolution anodes, and titanium anodes have oxygen-evolution, chlorine-evolution functions or both according to their surface catalytic coatings.
3. Lead and lead alloy anode
The lead alloy anode belongs to the oxygen evolution anode, and the electrolyte for the oxygen evolution reaction is sulfuric acid and sulfate, which is mainly used in electrolytic metallurgy. Such anodes have the disadvantage that the geometry will change during electrolysis. , During the electrolysis process, the lead anode matrix is first converted into lead sulfate and then into lead oxide. Lead sulfate is an intermediate layer that acts as an insulator and acts as a chemical barrier to protect the lead matrix of the inner layer in a sulfuric acid environment. Lead oxide is an electrode in the actual sense in the outer layer, and oxygen evolution reaction occurs on it. The oxygen evolution potential of lead oxide is very high, and it rises rapidly with the increase of current density. This feature of lead alloy anode is that it is oxidized by its outer layer material. The inherent characteristics of lead - lead oxide is determined by a poor conductor of electricity. In addition, during the electrolysis process, the electrochemical performance of the lead oxide anode structure is constantly attenuated, and the generation of internal stress causes the oxide layer to fall off. In addition, the formation of lead peroxide also causes the oxide to dissolve continuously. The sulfuric acid as the intermediate layer The lead is converted into lead oxide again and becomes a new electrocatalytic active material of the outer oxide, and the lead matrix of the inner layer is oxidized again to form a new intermediate protective layer of lead sulfate. Therefore, during the electrolysis process, lead and its alloying elements are continuously dissolved into the electrolyte and precipitated, causing solution pollution (chemical precipitation in the solution) and pollution of cathode products (electrodeposition of pollutants on the surface of the cathode, and the purity of electrolytic copper cannot be very high. good is guaranteed).
4. Titanium anode
Compared with graphite anodes and lead alloy anodes, titanium anodes do not suffer from mechanical dimensional attenuation, so they are also called dimensionally stable anodes. Titanium anodes have the following advantages: stable geometric dimensions; diversity of geometric shapes; excellent stability of electrochemical and chemical properties; excellent electrocatalytic activity; low anode potential and insensitivity to changes in circuit density; energy saving and prolonged electrolysis Service life of the liquid; maintenance-free; long life (very important); high quality cathode product (no or very few impurities, uniform microstructure, such as electrolytic copper, zinc, nickel). Titanium anode is a double-layer composite structure consisting of a metal substrate and a coating on the substrate. The titanium substrate is used as a conductor, and the coating acts as an electrochemical catalyst for the oxygen evolution/chlorine evolution reaction. The oxygen evolution/chlorine evolution potential of this coating is low, and the oxygen evolution/chlorine evolution potential hardly changes with the current density. Titanium-based electrical conductor is a permanent material with a long coating life. It can be used to obtain an almost pure cathode product, which is pollution-free and energy-saving.
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Nicole
Company: Baoji Jimiyun Dynamic Co., Ltd
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