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Correct use of platinum-coated titanium electrodes
Platinum-coated titanium electrodes have four outstanding features as anode materials:
1. Corrosion resistance, durability and high temperature resistance are very strong, and the stability is extremely high, which can be used for various media;
2.Lower cost than pure gold and pure platinum anodes, but with similar electrochemical performance;
3. Overpotential for oxygen evolution reaction is very high, overpotential for 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 anodes.
Proper use of platinum-coated titanium electrode:
1. Before using a platinum-coated titanium electrode, you must first exclude (must be detected) the presence of "fluorine" and "phosphate" ions in the plating solution, and confirm that there is no corrosion of the platinum-coated titanium electrode.
The platinum-coated titanium electrode can be safely used only after the extremely chemical composition, otherwise, the base material of the platinum-coated titanium electrode will be severely corroded, the platinum coating will fall off, and the service life will be shortened.
Do not casually use hard-ming additives and fluoride ion recovery chromic anhydride.
2. Reasonably choose the best I art: The platinum-coated titanium electrode's current density is best to be less than 50A / dm2, and the groove voltage is less than 10V, otherwise it will affect the service life and seriously cause the sun.
Electro-corrosion and dissolution occur, and the plating layer is peeled off. Try to choose a process that does not generate solid oxides in the anodic oxidation reaction to avoid the thickening and passivation of oxides affecting the platinum-coated titanium electrode.
The cause of anode breakdown is determined by the inherent characteristics of titanium material. When the groove pressure is greater than 10V, the titanium surface in contact with the platinum coating begins to slightly dissolve. At 12V, the breakdown is complete.
The slot you can see can no longer display 12V, you can only see about 11V. At this time, the current cannot be added, and the anode is damaged, so it is safe to use a platinum-coated titanium electrode.
The tank pressure is below 10V.
3. In principle, the surface area of the cathode should be less than the effective anode area (that is, the anode area under the liquid surface), and it should not be used when the anode area is smaller than the cathode area, otherwise the anode is easy.
It was broken and can no longer be used normally.
4. When the resistance of the plating tank increases, the tank pressure will also increase. When the tank voltage exceeds 10V, the current should not be increased, but the current should be adjusted appropriately, such as: the current is reduced by 10%, and
10% longer plating time.
There are many reasons for the increase in impedance, mainly as follows:
Anodizing reaction over time, the oxide layer becomes thicker and passivated;
Because the titanium plate in contact with the bus bar has virtual contacts or the surface of the titanium plate is passivated at high temperature;
Reduce the content of conductive medium in the plating solution;
★ Anode breakdown, the bonding force between the platinum layer and the substrate is damaged;
* Poor contact between rectifier power and bus.
How anodic and cathodic coatings protect the base metal
Lead dioxide titanium anode