What is the correct way to use platinized titanium electrodes?
Platinum Coated Titanium Anode ：Platinum coated titanium electrode as anode material has four characteristics:
1. Strong corrosion resistance, durability and high temperature resistance, high stability, can be used in various media;
2. The cost is lower than pure gold and pure platinum anode, but it has similar electrochemical performance;
3. The overpotential is very high for the oxygen evolution reaction, and the overpotential for the hydrogen evolution reaction is very low;
4. It has the characteristics of high output current density, uniform conductivity and small loss, and is suitable for DSA insoluble anode.
Platinum-coated titanium anodes ： the correct use of platinum-coated titanium electrodes
1. Before using platinum-coated titanium electrodes, it is necessary to exclude (must be detected) the existence of "fluorine" ions and "phosphate" ions in the plating solution, and it is safe to confirm that there is no chemical composition that corrodes platinum-coated titanium electrodes. Use platinum-coated titanium electrodes, otherwise, the bottom substrate of platinum-coated titanium electrodes will be severely corroded, the platinum coating will fall off, and the service life will be shortened. Do not use hard chromium additives and recycled industrial chromic anhydride containing fluoride ions casually.
2. Reasonable selection of the best process: The current density of the platinum-coated titanium electrode is preferably below 50A/dm2, and the tank pressure is below 10V, otherwise the service life will be affected, and the anode will be seriously corroded and dissolved, and the coating will fall off, try to choose The process of anodizing reaction without the formation of solid oxides avoids the influence of thickening and passivation of oxides on the electrical conductivity of platinum-coated titanium electrodes. The reason for anode breakdown is determined by the inherent characteristics of the titanium material itself. When the cell pressure is greater than 10V, the titanium surface in contact with the platinum coating begins to dissolve slightly. At 12V, it breaks down completely. After the breakdown, the cell pressure we see can no longer be displayed. 12V can only see about 11V. At this time, the current can no longer be added, and the anode is damaged. Therefore, the pressure of the tank for safe use of platinum-coated titanium electrodes is set below 10V.
3. In principle, the surface area of the cathode should be smaller than the effective anode area (that is, the anode area under the liquid surface). It should not be used when the anode area is smaller than the cathode area, otherwise the anode will be easily broken down and cannot be used normally.
4. When the impedance of the plating tank increases, the tank pressure will also increase. When the tank pressure exceeds 10V, the current should not be increased, but the current should be adjusted appropriately, such as: the current is reduced by 10%, and the plating time is extended by 10%. .
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