Platinum coated titanium anodes-Platinum coated titanium electrodes have four characteristics as anode materials:
1. Strong corrosion resistance, durability and high temperature resistance, extremely high stability, can be used in 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.
Platinum coated titanium anode-the correct use of platinum coated titanium electrode
1. Before using a platinum-coated titanium electrode, it is necessary to exclude (must be detected) the presence of “fluorine” and “phosphate” ions in the plating solution. After confirming that there are no chemical components that corrode the platinum-coated titanium electrode, it can be safe. Use a platinum-coated titanium electrode. 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 use hard chromium additives and fluoride-containing recycled industrial chromic anhydride.
2. Reasonably choose the best process: The platinum-coated titanium electrode’s current density is best selected below 50A / dm2, and the tank pressure is below 10V, otherwise it will affect the service life, which will seriously cause the anode to appear electrolytic corrosion and dissolution, and the coating will fall off. The process of anodic oxidation without solid oxide formation prevents the thickening and passivation of oxides from affecting the conductive properties of platinum-coated titanium electrodes. 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, and it is completely broken at 12V. Only 12V can be seen at 12V. At this time, the current can no longer be applied, and the anode is damaged. Therefore, the tank pressure of the platinum electrode for titanium that is safe to use is set 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). It should not be used when the anode area is smaller than the cathode area, otherwise the anode is easily broken down and cannot be used normally.
4. When the resistance of the plating tank is increased, the tank voltage will also increase. When the tank voltage exceeds 10V, the current should not be increased, and the current should be adjusted appropriately, such as: the current is reduced by 10%, and the plating time is extended by 10%. .