Electrophoretic coating is a painting technique that involves immersing the object to be coated (such as a steel mold) into a water-soluble paint as the anode (anodic electrophoresis) while setting up a corresponding cathode. A direct current is applied between the two electrodes, and the physical and chemical action of the current produces a uniform coating on the object.

Electrophoretic painting requires the use of electrophoretic paint, commonly known as water-soluble paint. The paint and distilled water must be diluted in specific proportions before use.

Electrophoresis typically involves four simultaneous processes:

Electrophoresis: Under the influence of a DC electric field, colloidal particles with positive and negative charges move in the positive and negative directions, respectively, also known as swimming.

2. Electrolysis: Oxidation-reduction reactions occur at the electrodes, but oxidation-reduction phenomena are formed on the electrodes.

3. Electrodeposition: Due to electrophoresis, charged colloidal particles moving towards the anode emit electrons at the template surface, precipitating in an insoluble state. This is when the paint film forms.

4. Electroosmosis: Under the influence of an electric field, the solid phase remains stationary while the liquid phase moves. Electroosmosis gradually removes moisture from the paint film, leading to a dense, low moisture content, high-resistance paint film through ***. This film is nearly impermeable to electricity.

For example, using ferric red epoxy electrostatic paint: This electrostatic paint is composed of modified epoxy resin, butanol, ethanolamine, talc, and ferric red. When mixed with distilled water, the electrostatic paint is separated into positively charged cations and negatively charged anions under the action of a DC electric field, undergoing a series of complex physical, chemical, colloidal chemical, and electrochemical changes.