The final steps are as follows, for the buyer’s reference
(1) Apply the liquid coating. The coating liquid is applied to the surface of the titanium substrate, usually by brush or electrostatic spraying or roller application.
(2) Drying. Each coating is fired in an infrared or far infrared lamp. The drying temperature is usually 100-200°C and the solvent slowly evaporates. The drying process consists of complete evaporation of the solvent. If the evaporation is not completed, the person is heated. During the oxidation process, it affects the adhesion of the coating and the electrochemical characteristics of the electrode.
(3) Thermal oxidation. Heat annealed in an oven at the specified temperature for 10-15 minutes. If the thermal oxidation temperature is too high, on the one hand, the chlorine content of the coating layer decreases to a low level and the conductivity of the coating layer deteriorates, on the other hand, the oxide crystal body increases and the crystal grains excessively aggregate to reduce the coating adhesion force, thus making its electrochemical performance deteriorate. The thermal oxidation temperature is too low, the oxidation is incomplete, the adhesion force is poor, and the desired electrocatalytic efficiency is not achieved.
The oxidation temperature affects the structure, composition, and properties of the coating, usually above 400° C, and a solid solution of RuO 2 and TiO 2 rutile structure can be obtained.
When the coating is a platinum group metal oxide, such as RuO2, the heating atmosphere must be oxidizing and a reducing atmosphere is not suitable.