What is coated titanium anode?

Coated titanium anode, is used to be called DSA titanium anode (Dimensionally Stable An2ode dimensional Stable anode), also known as DSE(Dimensionally Stable Elec2trode), is a new type of insoluble anode material developed in the late 1960s.

Traditional anode materials are generally divided into three categories: platinum, graphite and lead alloy anode. Platinum price is expensive, graphite and lead alloy anode high current electrolysis occurs corrosion, corrosion resistance is poor, oxygen evolution potential. The electrochemical catalytic performance is low and the energy consumption is high, especially the toxic lead in the anode will dissolve in the solution, causing secondary pollution and degradation of the coating performance.

Application of coated titanium anode:

Coated titanium anode is mainly used in electrochemistry and electrometallurgy. The application fields of coated titanium anode are: chlor-alkali industry, chlorate production, hypochlorite production, perchlorate production, persulfate electrolysis, electrolytic organic synthesis, electrolytic extraction of non-ferrous metals, electrolytic silver catalyst production, electrolysis of copper foil, electrolytic oxidation recovery of mercury, water electrolysis, chlorine dioxide production, hospital sewage treatment, electroplating plant cyanide wastewater treatment, domestic water And food utensils disinfection, power plant cooling circulating water treatment, wool mill dyeing and finishing wastewater treatment, industrial water treatment, electrolytic acid and alkali ionized water, copper plate galvanized, basking, palladium plating, gold plating, lead plating, electrodialysis desalination of seawater, electrodialysis method for tetramethylammonium hydroxide, molten salt electrolysis, battery production, cathodic protection, production of anode foil, aluminum foil anodizing Etc. Widely used in chemical industry, metallurgy, water treatment, environmental protection, electroplating, electrolytic organic synthesis and other fields.

In recent years, there has been a new trend of coated titanium anode in surface treatment industry. For example, some nanomaterials are added to the coating to improve the electrocatalytic activity of the anode. For example, in some specific plating solution, by regulating the oxygen evolution potential of the coating, the generation of some impurity ions can be inhibited to ensure the stability of the plating solution. With the further research of coated titanium anode, its application prospect will be more and more broad.

Coated titanium anode is widely used in seawater treatment, brine, sodium hypochlorite production, wastewater treatment industry, electroplating industry, hydrometallurgy and other industries, product quality is stable, excellent performance, cost-effective, in the industry reputation is very good.

classification

Soluble anode and insoluble anode

Soluble anodes supplement metal ions and conduct electricity during electrolysis, while insoluble anodes only conduct electricity. The earliest insoluble anodes were graphite and lead series anodes. Titanium anodes began to be used in electrolysis and electroplating industries as a new technology in the 1970s. Insoluble anodes can be divided into two main categories: chlorine and oxygen evolution. Chlorine evolution anode is mainly used for chloride electrolytic liquid system, electroplating process of the anode chlorine gas release, so called chlorine evolution anode; Oxygen evolution anode is mainly used in sulfate, nitrate, hydrocyanate and other electrolytic liquid system, electroplating process of the anode has oxygen release, so called oxygen evolution anode. Oxygen evolution anodes of lead alloy and titanium anodes have the function of oxygen evolution, chlorine evolution or both according to the different catalytic coating on the surface.

Titanium anode for chlor-alkali industry

Compared with the graphite electrode, the diaphragm method is used to produce caustic soda. The operating voltage of the graphite anode is 8A/DM2, and the coating anode can be doubled to 17A/DM2. In this way, the product can be multiplied under the same electrolytic environment, and the product quality is high, high chlorine purity.

Titanium anode for electroplating

The insoluble anode for electroplating is to coat the titanium matrix (mesh, plate, strip, tube, etc.) with noble metal oxide coating with high electrochemical catalytic performance, and the coating contains high stability valve metal oxide. The new type of insoluble titanium anode has high electrochemical catalytic energy, oxygen evolution potential is about 0.5V lower than the lead alloy insoluble anode, energy saving, high stability, no pollution bath, light weight, easy to replace. The oxygen evolution overpotential of the new insoluble titanium anode is also lower than that of the platinized insoluble anode, but its life is more than 1 times longer. Widely used in various electroplating as anode or auxiliary anode, can replace the conventional lead based alloy anode, under the same conditions, can reduce the tank voltage, save energy consumption; Insoluble titanium anode has good stability (chemical, electrochemical) and long service life during electroplating. This anode is widely used in nickel plating, chrome plating, zinc plating, copper plating and other non-ferrous metal plating industries.

Lead and lead alloy anode

Lead alloy anode belongs to oxygen evolution anode, oxygen evolution reaction electrolyte for sulfuric acid and sulfate, mainly used for electrolytic metallurgy. The anode has the disadvantage that its geometry changes during electrolysis. In the electrolytic process, the lead anode matrix is converted first to lead sulfate and then to lead oxide. Lead sulfate is an intermediate layer, which acts as an insulator and a chemical barrier to protect the inner lead matrix in the sulfuric acid environment. The outer layer of lead oxide is a practical electrode, where oxygen evolution occurs. The oxygen evolution potential of lead oxide is very high and increases rapidly with the increase of current density. This characteristic of lead alloy anode is determined by the inherent characteristic of its outer material, lead oxide, which is a bad conductor of electricity. In addition, in the process of electrolysis, the electrochemical performance of the anode structure of lead oxide continues to decay, and the generation of its internal stress leads to the shedding of layers of oxides. In addition, the generation of lead peroxide also leads to the continuous dissolution of oxides. The lead sulfate as the intermediate layer is converted to lead oxide again, becoming a new electrocatalytic active substance of the outer oxide, and the lead matrix in the inner layer is oxidized again. A new intermediate protective layer of lead sulfate is formed. Therefore, in the process of electrolysis, lead and its alloying elements continue to dissolve into the electrolyte and precipitate, resulting in solution contamination (chemical precipitation in the solution) and cathode product contamination (electrodeposition of pollutants on the cathode surface, and the purity of copper electrolyzed can not be well guaranteed).

Coated titanium anode

Coated titanium Anode, is commonly known as DSA(Dimensionally Stable Anode), also known as DSE(Dimensionally Stable anode), is a new type of insoluble anode material developed in the end of the 1960s. DSA coated titanium anode is mainly used in electrochemistry and electrometallurgy.

DSA  The application fields of coated titanium anode are: chlor-alkali industry, chlorate production, hypochlorite production, perchlorate production, persulfate electrolysis, electrolytic organic synthesis, electrolytic extraction of non-ferrous metals, electrolytic silver catalyst production, electrolysis of copper foil, electrolytic oxidation recovery of mercury, water electrolysis, chlorine dioxide production, hospital sewage treatment, electroplating plant cyanide wastewater treatment, domestic water And food utensils disinfection, power plant cooling circulating water treatment, wool mill dyeing and finishing wastewater treatment, industrial water treatment, electrolytic acid and alkali ionized water, copper plate galvanized, rhodium plating, palladium plating, gold plating, lead plating, electrodialysis desalination, electrodialysis method to tetramethylammonium hydroxide, molten salt electrolysis, battery production, cathodic protection, the production of anode foil, aluminum foil anodizing Etc. Widely used in chemical industry, metallurgy, water treatment, environmental protection, electroplating, electrolytic organic synthesis and other fields.

Titanium anode introduction:

Titanium anode is processed on the basis of industrial titanium coated with a layer of metal oxide, this oxide is called MMO, generally divided into ruthenium titanium anode and iridium titanium anode, product shape is generally customized, plate, mesh, tube, silk and so on. Now with the development of industrial economy, the traditional single oxide has not been able to meet the needs of some enterprises, Yide technology after continuous research and development, adjust the coating formula, developed three, four and other multi-element titanium anode noble metal oxide coating, can significantly improve the performance of titanium anode.

Type of titanium anode:

1, chlorine out titanium anode (ruthenium coating titanium electrode) : electrolyte chloride ion content is high: generally in the environment of hydrochloric acid and electrolytic seawater, electrolytic salt water environment.

2, titanium oxide evolution anode (iridium series coated titanium electrode) : electrolyte is generally sulfuric acid environment.

3. Platinum-plated titanium anode (platinum-coated anode) : titanium is the substrate, and the surface is plated with precious metal platinum.

Application field of titanium anode:

Industrial wastewater treatment, electroplating wastewater treatment, electrolysis extraction of non-ferrous metals, cathodic protection, electrolytic gold foil generation, electrolytic functional water, seawater desalination, electroplating industry and electrolytic organic synthesis and other industries and fields.

At present, the domestic research and development of titanium anode is constantly expanding the field and application, but the technology is still lagging behind developed countries, still need further in-depth research in related fields.