Use and maintenance of titanium anode products
Precautions for electrode use
1. The titanium electrode has a black surface after oxidation and sintering. The uncoated surface is blue and does not have electrode performance. The black side corresponds to the cathode.
2. Once the acid cleaning of the titanium electrode substrate is completed, all subsequent production and processing procedures and use procedures must be carried out strictly and carefully. Wear clean gloves to jam the ends or edges of the anode when moving, and it is best to touch the uncoated part. Any scratches on the coating surface are strictly prohibited. Be careful when installing and handling, and the coating surface must not be scratched, otherwise local corrosion will occur soon.
Note: The titanium substrate itself is not conductive. The outer layer of the precious metal oxide coating has electrocatalytic activity, conductivity, and oxidation resistance, but its thickness is only about 20 microns. If it is scratched or damaged, it will be electrolytic In the process, the electrode will corrode from the damage first, which will affect the quality and effect of the entire electrode.
3. The electrolyte should be stable, especially not containing cyanide and fluoride ions. These impurities will seriously corrode the titanium matrix and affect the service life of the anode.
4. Add a filter device before the electrolyte enters the electrolytic cell. It must not contain metal particles with a diameter greater than 0.1mm to prevent excessive accumulation and cause short circuit between the anode and the anode. Shielding anode performance. If the plate is fouled, it needs to be cleaned with dilute hydrochloric acid, and not brushed.
5. When electrolytic recovery of metals such as copper, nickel, gold, silver, cobalt, etc., the cathode attachment should not be too thick to prevent the short-circuit breakdown of the cathode and anode caused by the small distance between the electrodes or the formation of metal punctures. Need to be cleaned regularly.
6. The distance between cathode and anode can be set according to actual production, generally 5-25mm. Generally speaking, the pole pitch will increase the voltage drop, but it should not be too small, otherwise the cathode scale generated on the cathode surface will easily cause the pole plate short circuit; therefore, the design of the pole pitch needs to be determined according to the structural state of the product.
7. Avoid extreme use. Once the noble metal oxide coating is used as a cathode, the surface undergoes a reduction reaction and is easily transformed into a metal element, which cannot be effectively combined with the titanium base, causing the coating to fall off.
8. It is not advisable to soak in the solution in the power-off mode for a long time when the machine is shut down. It is best to load a small current of about 5a to protect the plates.
9. When the machine is stopped or under other maintenance conditions, add dilute acid or clean the electrode surface with clean water, but do not use nylon or mechanical substances to wash it.
10. The temperature of the electrolyte should not be too high when working. The ideal temperature is 25-40℃. If conditions permit, a heat exchange device can be added to keep the electrode in the best environment.
11. The normal working current density is within 2000a/m2. Excessive current will cause the reaction to be too intense, the coating will fall off, and the anode life will be shortened;
12. When starting up, load current to the electrolyzer step by step, do not rise to the position all at once, and also when stopping.
13. Keep the anode clean during production and use, and must not be contaminated with oil or other attachments, so as not to affect the electrolysis effect and electricity
Electrolysis effect and electrode life.
14. The anode is alive, ensuring the stability of production is more conducive to extending the life cycle. If the anode coating falls off, repair the coating in time to avoid excessively high cell voltage.