The finishing steps are as follows, for the buyer’s reference
(1) Apply a coating liquid. The coating liquid is applied to the surface of the titanium substrate, usually by brush coating, or by electrostatic spraying or roll coating.
(2) Drying. Each coating is baked in an infrared lamp or a far-infrared lamp. The drying temperature is generally 100-200 ° C, and the solvent is slowly volatilized. The drying process is to volatilize the solvent completely. If the volatilization is not complete, the person is hot. In the oxidation process, the adhesion of the coating and the electrochemical performance of the electrode are affected.
(3) Thermal oxidation. Calcined in a furnace at the specified temperature for 10-15 minutes. If the thermal oxidation temperature is too high, on the one hand, the chlorine content in the coating layer is lowered to a low level, and the conductivity of the coating layer is deteriorated; on the other hand, the oxide crystal body is enlarged, and the crystal grains are excessively aggregated to lower the coating adhesion force, thereby making it The electrochemical performance deteriorates. The thermal oxidation temperature is too low, the oxidation is incomplete, the bonding force is poor, and the desired electrocatalytic performance is not obtained.
The oxidation temperature affects the structure, composition and properties of the coating, generally above 400 ° C, and RuO 2 and TiO 2 solid solution of rutile structure can be obtained.
When the coating is a platinum group metal oxide, such as RuO2, the heating atmosphere must be oxidizing, and the reducing atmosphere is not suitable.