Physical treatment of titanium plates
① with 180 mesh sandpaper size 70mm × 30mm × 2mm titanium plate edge part of the smooth, Titanium Plate to eliminate the edge effect of the electrode.
② with 600 mesh yarn will be the surface of the titanium plate polished bright, so that the titanium plate surface oxide can be completely removed.
③ With 120 mesh roving in the two vertical direction of the grinding, the main grinding electrode 30mm × 30mm area (the degradation of organic matter occurred mainly in this area), the purpose is to increase the titanium plate surface roughness, improve its mechanical adhesion , The surface of the titanium substrate after grinding will form a hole, so that the electrocatalytic activity of the oxide in the coating is attached to the hole to produce a special fit, Titanium Plate so that the coating on the substrate adhesion more closely to prevent the coating off.
Chemical treatment of titanium plate surface
(1) alkaline washing
As the titanium matrix in the process of easy to contaminate the oil, it should be in the further treatment before the oil removal. The removal step is:
① Wash the polished titanium plate with distilled water and blot the moisture on the surface of the titanium plate using filter paper.
② the titanium plate into the concentration of 40% NaOH solution, Titanium Plate the amount of NaOH solution to completely submerged titanium plate prevail;
③ immersed in NaOH solution in the titanium plate into the constant temperature water bath 80 ℃, constant temperature heating 2 hours;
④ After removing the titanium plate, rinse its surface with hot water until the sodium hydroxide solution on the surface of the titanium plate is completely washed off and the washing wastewater reaches neutral (pH = 7).
After pickling, the surface of the titanium substrate will form uneven uneven surface, with a large specific surface area, can improve the electrochemical performance of the electrode, enhance the bonding between the substrate and the metal oxide coating, thereby improving the electrode Conductivity, to extend its service life, while the titanium substrate can remove the surface of the oxide. In this experiment, the titanium matrix was pickled with oxalic acid solution . The steps are:
① the alkaline washing of titanium plate into the mass concentration of 15% oxalic acid solution, Titanium Plate the amount of oxalic acid solution to submerged titanium plate completely prevail;
② the titanium plate into the constant temperature water bath 90 ℃, constant temperature heating 2 hours;
③ remove the titanium plate, the use of distilled water titanium plate surface of the oxalic acid and titanium oxalate washed out, then the surface of the titanium plate should be uneven gray Ma Ma;
④ the pretreatment of titanium plate into the mass concentration of 1% of the oxalic acid solution to spare.
Titanium matrix treatment
Titanium plates of 50 mm × 12 mm × 2 mm were sandwiched by sandpaper to remove the surface oxide layer and degreased in a 5% (mass fraction, same) sodium carbonate solution (boiling state) and then placed in a 10% Oxalic acid solution (boiling state) in the acid corrosion 2 ~ 3 h to form a uniform gray surface removal, first rinse with distilled water, and then shake in the ultrasonic cleaning 15 min after drying, Titanium Plate placed in anhydrous ethanol in reserve.
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