Titanium electrode for sodium hypochlorite generator
Titanium electrode for sodium hypochlorite generator
The Titanium electrode is an important part of the sodium hypochlorite generator system. Baoji City Changsheng Titanium Company provides a kind of titanium electrode for the sodium hypochlorite generator, including an anode plate, a cathode plate and two fixed plates. The anode plate and the cathode plate are placed in two The two fixed plates are placed at intervals and passed through by the PVC shaft. One end of the PVC shaft is locked with a nut to fix the distance between the anode plate and the cathode plate. Both the end faces of the two fixed plates are provided with binding posts. The surface of the cathode plate is coated with ruthenium, iridium and titanium oxide coatings. The utility model improves the anti-reduction ability of the anode and is suitable for electrolytes with low chloride ion concentration. The oxygen potential is higher than that of ruthenium titanium, and it is not easy to release oxygen during the electrolysis of brine.
The production of titanium electrode
Because there is no national standard for electrode coating, domestic and foreign companies will formulate their own standards. The rare metal formula of the titanium electrode manufacturer will be made according to three conditions: 1. The concentration of dilute brine; 2. The service life is 3 years or 5 years; 3. It meets the requirements of the generator manufacturer for the number of grams per square meter of coating (this condition is not mentioned by many manufacturers. come out).
Regardless of whether the titanium electrode is domestic or foreign, at present, every electrode manufacturer uses titanium substrate as the carrier material, and the coating is a ruthenium-iridium coating system, that is, the final mixture of iridium dioxide and ruthenium dioxide on the titanium plate is a noble metal oxide coating. In terms of coating, each company has its own formula, mainly due to the different proportions of the precious metal ruthenium and iridium, as well as the amount of precious metal coated, and the difference in how many grams of precious metal ruthenium and iridium are coated per square meter.
In terms of the coating process and surface pretreatment, domestic and foreign manufacturers are basically the same at present. Titanium plates need two roughening treatments, mechanical sandblasting and oxalic acid etching, before coating. Titanium Electrodes produced by foreign brands in China When coating, the process of manual brushing is also adopted, and the process of thermal decomposition is used.
Key parameters for judging the performance of titanium electrodes:
① Enhanced lifetime test, the 5-year life of the electrode plate can reach 200 hours under the enhanced current of 20000A/square meter. This parameter is mainly to verify the ability of the anode plate to resist oxygen corrosion when the side reaction of the oxygen evolution reaction occurs.
② The chlorine analysis efficiency of the titanium electrode, this parameter is mainly the reaction plate under the same salinity, how much current is used to generate chlorine analysis, that is, the chlorine analysis ability of the titanium electrode.
③ The chlorine analysis potential is the potential of the electrode when the chlorine analysis reaction occurs. If the potential is low, the titanium electrode will save electricity. This parameter is basically the same as the ruthenium iridium formula.
Therefore, whether domestic or foreign electrode manufacturers meet the above three conditions, the quality is the best.
