The titanium anode is the anode in the titanium-based metal oxide coating. According to the different catalytic coatings on the surface, it has the function of oxygen evolution and chlorine evolution. Generally, electrode materials should have good electrical conductivity, small change in pole pitch, strong corrosion resistance, good mechanical strength and processing performance, long life, low cost, and good electrocatalytic performance for electrode reactions. Titanium is currently the most satisfactory. For metals required for comprehensive requirements, industrial pure titanium TA1\TA2 is generally used
The role of the metal oxide coating on the titanium anode is: low electrical resistivity, good electrical conductivity (titanium itself has poor electrical conductivity), stable chemical composition of the precious metal coating, stable crystal structure, stable electrode size, and corrosion resistance Good, long life, with good electrocatalytic performance, which is beneficial to reduce the overpotential of oxygen evolution and chlorine evolution reactions and save electric energy.
What are the classifications of titanium anodes?
The soluble anode plays the role of replenishing metal ions and conduction during the electrolysis process, while the insoluble anode only plays the role of conduction. The earliest insoluble anodes were graphite and lead anodes. Titanium anodes began to be used in electrolysis and electroplating industries as a new technology in the 1970s. 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. Chlorine gas is released from the anode during electroplating process, so it is called chlorine evolution anode. Oxygen evolution anode is mainly used in electrolyte systems such as sulfate, nitrate, hydrocyanate, etc., electroplating Oxygen is released from the anode during the process, so it is called the oxygen evolution anode. Lead alloy anode oxygen evolution anode, titanium anode has the function of oxygen evolution, chlorine evolution or both according to the different catalytic coating on the surface.
Compared with graphite anodes and lead alloy anodes, titanium anodes do not have the disadvantage of mechanical dimensional attenuation, so they are also called dimensional stability 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 insensitive to changes in circuit density; energy saving and prolonged electrolysis The service life of the liquid; maintenance-free; long life (very important); high-quality cathode products (no impurities or very few impurities, uniform microstructure, such as electrolytic copper, zinc, nickel). The titanium anode is a double-layer composite structure consisting of a metal substrate and a coating on the substrate. The titanium substrate acts as a conductor, and the coating functions 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 conductor is a permanent material with a long coating life. It can be used to obtain almost completely pure cathode products, pollution-free and energy-saving.
