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Development and manufacturing process of titanium electrode.The earliest dates were from 1786 to now more than 200 years. Electrolysis is a process that converts electrical energy into chemical energy. The most representative caustic soda industry aqueous solution electrolysis industry can explain the development history of electrode materials.Saline electrolysis was initially used in the laboratory with platinum electrodes, natural carbon electrodes, natural graphite electrodes, magnetic iron oxide electrodes, and lead dioxide electrodes. These are the first electrode materials to be tested. Salt water electrolysis requires that the anode material has good point catalytic performance for chlorine precipitation, good durability, and has the ability to inhibit oxygen precipitation. The earliest electrodes used in industrial production were graphite electrodes. The graphite electrode can fully meet the above requirements when the salt water concentration is high. However, the graphite anode has the following disadvantages in the long-term production: high resistance.
Therefore, the power consumption is high; With the electrochemical reaction process, the loss of graphite electrode is large and the electrode distance changes, which causes the instability of electrolysis production. The active surface for the chlorination reaction is difficult to maintain.
Since the 1960s, the petrochemical industry has developed rapidly. Many large ethylene plants have been set up in various places, and the synthetic production of organic chlorides has increased greatly. This requires a big leap in chlor-alkali production. At this time, the graphite anode is required to have mechanical processing capacity. To open holes in the graphite anode, the processing performance of the graphite anode itself is not very good, and it requires new materials to replace it. The development of the metal anode is particularly important. Metal anodes have a long history of development. The earliest metal anodes were mainly platinum anodes, but they were expensive and could not be widely used.
From 1910 to 1940, sponge titanium was produced by magnesium thermal reduction and sodium thermal reduction. And mass production. Titanium as the substrate anode, also known as: valve type metal, has a stable oxide layer protection, so that the anode electrode can not pass, so in the condition of salt water electrolysis has good durability and stability. Metal titanium can be mechanical processing at will, can be made of titanium plate, titanium rod, titanium wire, titanium mesh, titanium tube, porous plate, etc. It is widely used.
In addition to the development of coating electrode in the 1960s, it is widely used in chemical industry, environmental protection, water and electricity solution, water treatment, electrometallurgy, electroplating, metal foil production, electromechanical synthesis, electrodialysis, cathodic protection and many other industries.To make a titanium anode is simply to brush or spray a noble metal oxide on top of a titanium material. At this stage, the inner titanium anode is mainly painted by brush. Such electrodes have a very wide range of applications. Titanium anode is also known as DSA anode because of its light and flexible production process. Compared with similar anodes, titanium anode has the following superior properties. The anode size is stable and the distance between electrodes does not change during the electrolysis process, which ensures that the electrolysis operation can be carried out under the condition of stable cell voltage. Low working voltage, small power consumption, DC power consumption can be reduced by 10-20%.
Titanium anode has long service life and strong corrosion resistance.
The solution of graphite anode and lead anode can be overcome, and the pollution of electrolyte and cathode products can be avoided. High current density, low overpotential, high electrode catalytic activity, can effectively capture high production efficiency. It can avoid the short circuit problem after the lead anode deformation and improve the current efficiency. The shape is easy to make and can be high precision. Titanium matrix can be reused. Low overpotential characteristic, the bubbles between the electrode surface and the electrode are easy to eliminate, which can effectively reduce the voltage of the electrolytic cell.
