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What is titanium anode? The full name of titanium anode is titanium base metal oxide coated titanium anode (MMO).Also known as KSA anode.(Size and shape stable anode). It takes titanium as the substrate, and brushes noble metal coating on the titanium substrate to make it have good electrocatalytic activity and conductivity.Classification of titanium anodes: according to the gas evolved from the anode in the electrochemical reaction, the chlorine evolved is called chlorine evolved anode, such as ruthenium-coated titanium electrode; the oxidation evolved is called oxygen evolved anode, such as iridium-coated titanium electrode and platinum titanium mesh/plate.Chlorine evolution anode (ruthenium coated titanium electrode): the content of chloride ion in the electrolyte is high: generally in hydrochloric acid environment, electrolytic seawater, electrolytic salt water environment.The corresponding products of our company are ruthenium iridium titanium anode and ruthenium iridium tin titanium anode.Oxygen evolution anode (iridium coated titanium electrode): The electrolyte is generally in sulfuric acid environment. 
Our products are iridium tantalum anode, iridium tantalum tin anode and high iridium anode.Platinum-plated anode (platinum titanium mesh/platinum titanium plate): titanium is the base material. The surface is plated with precious metal platinum, and the coating thickness is generally 1-5um (micron).The mesh size of platinum titanium mesh is generally 12.7 * 4.5mm or 6 * 3.5mmSelection of anode: If the customer is not clear about what anode should be used, we need the customer to provide the working environment and medium of anode:
1.Current density per square meter (The current intensity carried by a single anode divided by the electrode surface area)
2.Temperature
3.PH value
4.Composition and proportion of solution
5.Products or uses, etc
What is the role of metal oxide coating on titanium anode?
By covering different coatings, the conductivity and electrocatalytic activity can be enhanced, the electrolytic reaction process can be promoted, and the service life of the anode can be extended under different service conditions to achieve the expected service effect
Thickness of metal oxide coating on titanium anode:
The electrochemical catalytic reaction is mainly caused by the noble metal in the coating.Only when the noble metal content meets the use requirements can the normal operation of the anode product be guaranteed.The thickness is only a representation, which is mainly determined by the number of times of brushing and the concentration of solvent, and has no direct connection with the amount of noble metal content.On the contrary, the thick coating is easier to fall off
What is anode passivation?
What is metal passivation? When the iron wire is immersed in dilute nitric acid, the iron wire will soon dissolve, but when the iron wire is placed in concentrated nitric acid, the dissolution of the iron wire almost completely stops.At this time, if the iron wire is put back in dilute nitric acid, the iron wire is no longer dissolved, and the naked eye or even microscope can not see any change on the surface of the iron wire.People think that the iron wire is in a passive state at this timeThe working life of the anode has a certain period during the electric angle operation.When the voltage rises very high and no current actually passes through, the anode will lose its function. This phenomenon is called anode passivation
What are the main factors affecting the service life of anode:
1.Current density: the current density is inversely proportional to the anode service life.The higher the current, the shorter the anode service life.Our company's anode design current density is within 2000A/M2.It is recommended that the current density should not exceed 2000A/M2. In addition, try to avoid the current flickering
2.Titanium base material:The base material of the anode is generally pure titanium, which is required to be above TA1.If the purity of the base material used is not enough, the corrosion resistance will be greatly reduced, which has a great impact on the service life of the anode
3.Electrolyte: It is forbidden to contain fluorine ion, cyano ion and sulfur ion in the electrolyte. If there is any, it will have a great impact on the life of the anode.The content of chloride ion in the electrolyte should be controlled within 200PPM.
4.Reverse pole: Reverse pole is a method often used in anode repair, which can make the old coating that has been passivated fall off from the surface of the substrate.Therefore,it is forbidden to reach the pole in use.
5.Frequent power failure: under the condition of no current passing through, the coating will be greatly damaged if it is soaked in the solution for a long time.Therefore, it is best to apply a small current when the anode is not working to maintain the generation of the circuit.When it is not used for a long time, take the anode out of the liquid, wash it with clean water, and store it in the air.
6.Artificial damage:the anode surface shall be free of hard damage.If part of the coating is damaged, even a small scratch will cause the anode to be quickly corroded/passivated, and finally lead to failure.Therefore, the anode shall be handled with care during installation and use to avoid collision.
7.Short circuit. It is forbidden to contact the anode and cathode when the power is on.The instantaneous current caused by short circuit is very large, which can burn the electrode plate.
8.Temperature: temperature and anode life are also inversely proportional. Our company's design temperature of anode is 40-60 ℃. It is recommended that the temperature should not exceed 60 ℃.
Advantages of titanium anode (compared with lead anode and lead tin anode):
1.The size is stable (the matrix is not dissolved), and the pole spacing does not change, which can ensure the stability of the cell voltage.
2.Low working voltage, low power consumption, 20% less power saving than lead anode
3.The cathode product has high purity
4.It will not produce anode slime and pollute the tank
5.Light weight can reduce labor intensity
6.The matrix can be reused.
