IrO2Ta205 coated titanium anode has excellent electrocatalytic activity and electrochemical quality. It is widely used in the electrolysis industry with strong corrosion of electrolytic medium, harsh working environment and high current density. It is currently recognized as the best oxygen evolution electrode.
A. Copper foil production
The production process of electrolytic copper foil is to first oxidize electrolytic copper to obtain a copper sulfate solution, and then electrolyze it in a raw foil machine to produce raw foil. . It includes two major processes of electrolysis and electroplating.
The production process conditions of a copper foil company: the concentration of H2SO4 is 120g/L, 7~9kA/㎡, and the gap between cathode and anode is 12mm. The use of IrTa anode can meet the production requirements and solve the problem of extremely high production current density.
B. Electrochemical formation of aluminum foil
The electrolyte is 10%-15% ammonium adipate, and the current density is 400-1000A/㎡. Aluminum foil electrochemistry can be used as IrTa coated anode to solve the problem of high concentration of organic matter.
C. Steel plate galvanized
The electrolysis industry, which is a large power consumer, such as steel plate galvanizing production line, uses DSA with low overpotential instead of lead electrode with high overpotential, which can reduce the power consumption by lowering the electrode potential. The most suitable coating components are iridium oxide and tantalum oxide.
IrO2Ta205 coated anode can be used in galvanizing production line to replace lead alloy electrode. Among these anode materials, IrO2-based anode has the best electrode performance, which has low oxygen evolution overpotential, low consumption of electrocatalytic active layer, and little pollution to electrolyte.
The IrO2Ta205 anode has a long working life in electrogalvanizing with high current density, such as 10kA/㎡.
D. Thick copper plating on circuit board
The distance between cathode and anode is 10mm, and the concentration of H2SO4 is 2mol/L. IRO2·Ta205 coated titanium anode can be used to solve the problem of extremely high acidity.
E chrome
When a TV glass bulb company in Shenzhen manufactures TV sets and computer glass screens, under high temperature and weak alkaline molten glass frit corrosion, the surface of the steel mold for punching glass bulbs is easily corroded and appears uneven. In order to make a glass screen with a smooth surface, the surface of the steel mold should be plated with hexavalent hard chromium. IrTa coated anodes can be used instead of lead electrodes.
F. Rhodium plating
In recent years, people have become more and more interested in platinum jewelry. Platinum-plated jewelry is actually rhodium-plated. Rhodium plating adopts rhodium sulfate plating solution, which is highly acidic and corrosive. IrTa coated titanium anodes have been used in the rhodium plating industry.
G. Silver nitrate electrolysis
Crude silver can be refined by electrolysis, and the silver content in the electrolyte is about 80g/L. The concentration of HNO3 is 20g/L. Use the insoluble anode electrolysis method to recover silver, the anode uses IrTa coated titanium anode, and the cathode deposits silver. Finally, the electrolysis waste solution contains only about 10g/L of Ag and 150g/L of HNO3.
H. Electrolytic organic synthesis
Electrodialysis can directly produce high-purity tetramethylammonium hydroxide from tetramethylammonium chloride by direct electrolysis. The anode uses IrO2·Ta205
Coated titanium anode, the anode life is many times longer than that of general RuSnTi coating.
I. Electrometallurgy
In electrolytic metallurgy, zinc production is the most representative. For the electrolytic production of zinc, lead alloy anodes containing small amounts of silver, antimony or calcium have been used. The following problems arise with the use of lead anodes: Dimensional instability of the lead electrode; too high oxygen evolution overpotential of about 800mV; corrosion during anodic polarization. Lead ions dissolve in the electrolyte and deposit on the cathode, contaminating metal zinc and affecting product quality. Dimensionally stable anodes (DSA) coated with various metal oxides on titanium substrates, such as RuO2, IrO2, MnO2, Ta2O5, etc., have low oxygen overpotential and inert performance, and can be considered as oxygen evolution anodes for acidic solutions. IrO2 (70%, mole fraction)·Ta205 (30%, mole fraction) composition is considered to be the best oxygen evolution anode coating. Among the coating components, IrO2 is anodically polarized electrochemically active material, and Ta2O5 can improve the chemical stability of IrO2. The working life of Ti/IrO2·Ta205 anode is estimated to be 5-10 years.
J. Electrochemical industrial purification
Although Ti/IrO anode is relatively expensive, it is still used in the electrochemical industrial purification process recently. This is due to the fact that Ti/IiO2 anodes are successfully used as oxygen evolution electrodes in moderately strong or weakly acidic solutions, while classical Ti/RuO2 electrodes cannot be used due to their short service life in low concentration chloride ion solutions. The TV/IrO2 anode can be used to remove cations in water (on the cathode), or to remove harmful substances in wastewater by anodic oxidation.
Ti/IrO2·Ta205 coated electrodes can be successfully used as oxygen evolution electrodes in the treatment of electroflotation wastewater containing dispersed peptides and oils. The stable cathode material is made of stainless steel, and the current density of both cathode and anode is 100-200A/㎡. The size of the bubbles (H2 and O2) produced by the electrochemical method is 50-100 μm to ensure the high efficiency of electric flotation, which can reach 99.5%, and can reduce the content of harmful substances in the wastewater. From the inlet concentration of 1 to 10g/L, Reduce to the outlet concentration of 1 ~ 10mg/L.
The flow rate of sewage passing through the electric tank is 12 ~ 16㎡/h, 4 ~ 6V, and the current is 300A. Ti/IrO2 anode (area 2㎡, Ir coating amount 12.3g/㎡, 65%IrO2, 35%Ta205) has a service life of more than 4 years in the cell.
K. High-speed tinned steel plate
The ruthenium-titanium-coated titanium anode used in the salt electrolysis industry has good electrocatalytic activity for chlorine analysis, and is used by more than 90% of the world's chlor-alkali enterprises, with a service life of up to 10 years. But it cannot be used in the electrochemical system of oxygen evolution, and its life is extremely short.
The iridium-based coated titanium anode has excellent oxygen evolution electrocatalytic activity and maintains high stability in the oxygen evolution electrochemical system. Since 1997, the iridium-based Coated titanium anodes are widely used, with a maximum life of about 1 year, replacing the original lead alloy electrodes.
If there are organic substances in the electrolyte, when oxygen is released from the anode, the problem of "high-speed loss of active coating in the presence of organic substances" will occur on the coated anode, and the service life is extremely short, even less than 1 day. The law of high-speed loss of active coating in the presence of organic matter is as follows:
(1) When the high-speed loss of the active coating occurs in the presence of organic matter, the potential of the electrode must rise significantly, even up to hundreds of millivolts.
(2) The rise of electrode potential in the presence of organic matter only occurs in the anode reaction of oxygen evolution, has no effect on the electrode potential of the anode reaction of chlorine evolution, and has no effect on the cathode reaction of hydrogen evolution.
(3) In the presence of organic matter, the electrode potential rises and the high-speed loss of the active coating does not occur on electrodes of other systems such as lead alloys, but only occurs on electrodes of platinum group metals and their oxide systems, which are platinum group metals and their oxides. A phenomenon unique to the electrode of the system.
Titanium platinum-plated electrodes have long been used in the high-speed tinplate (tinplate) production line of Ferrostan tin plating solution. Although Ferrostan tin plating solution contains high concentration of organic phenolic mineral acid (PSA), the service life of platinum-plated electrodes can reach 1 year.
The authors of the literature have developed a long-life platinum-group metal oxide-coated titanium electrode that is resistant to organic corrosion.
Three kinds of electrodes were prepared by thermal decomposition method. The A-type electrode is coated with IrO2 Ta205, the B-type electrode is coated with a layer of SnO2 on the A-type electrode coating, and the C-type electrode is added with SnO2 in the IrO2 Ta205 coating.
Table 3-11 shows the enhanced electrolytic accelerated test life of the three electrodes in the presence or absence of PSA electrolyte. In the electrolyte containing organic substance PSA, the lifetime of type A electrode is significantly shortened from 3120h to 122h, indicating that PSA, like other organic substances, also accelerates the deterioration of the electrode; but the presence of SnO2 slows down this deterioration. After the C-type electrode is improved, it is applied to a high-speed electroplated tin plate production line of a Ferrostan type tin plating solution, and the service life can reach 3 years.
Baoji JM-TITANIUM—Professional anode design and manufacturer
Over the years, we have been specialized in anode research and development, production and manufacturing, and our products are exported to many countries around the world. Various series of anodes can be designed and produced according to the actual environmental parameters of different users. You are welcome to visit and negotiate.
Nicole
Company: Baoji Jimiyun Dynamic Co., Ltd
Cuntry:China
Add:Baoti road,Jintai,Baoji city,Shaanxi,China
Cel:+86 13369210920
Gmail:nicole@jmyunti.com
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