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Introduction to the electrophoretic coating process

更新时间：2021-08-11 浏览：51

Electrophoretic coating is a common technique for coloring the product shell, which can be more uniformly colored than spraying. What we call electrophoretic coating is to immerse the coated object in water-soluble paint as the anode (anodic electrophoresis), and set up a corresponding cathode. Direct current is applied between the two poles. The physical and chemical effects of the current are used. A type of electrophoretic coating technology that makes the paint evenly spread on the object to be coated. Electrophoretic coating must use electrophoretic coating. Electrophoretic coating is usually called water-soluble paint. Electrophoretic coating and distilled water must be diluted in a certain proportion before use.

Electrophoretic coating generally includes four simultaneous processes:

1. Electrophoresis: Under the action of a direct current electric field, the positive and negatively charged colloidal particles move in the negative and positive direction, also known as swimming.

2. Electrolysis: oxidation and reduction reactions are carried out on the electrodes, but oxidation and reduction phenomena are formed on the electrodes.

3. Electrodeposition: Due to the effect of electrophoresis, the charged colloidal particles moved to the vicinity of the anode emit electrons on the surface of the template, and deposit in an insoluble state. At this time, the paint film is formed.

4. Electroosmosis: Under the action of an electric field, the solid phase does not move while the liquid phase moves. Electroosmosis causes the water content in the paint film to be gradually drained out of the paint film, and then forms a dense paint film with very low water content and high electrical resistance.