The so-called electrophoretic coating is to immerse the object in a water-soluble paint as an anode (anode electrophoresis), and a corresponding cathode, which is connected with a direct current between the two poles, and the physicochemical action caused by the current makes the coating A coating technique that is evenly applied to an object to be coated. Electrophoretic paint must use electrophoretic paint. Electrophoretic paint is usually called water-soluble paint. Electrophoresis paint and distilled water must be diluted in a certain proportion before use. Electrophoretic coating generally consists of four simultaneous processes:
1. Electrophoresis: Under the action of DC electric field, positive and negative charged colloidal particles move to the negative and positive direction, also known as swimming.
2. Electrolysis: The oxidation-reduction reaction is carried out on the electrodes, respectively, and oxidation and reduction phenomena are formed on the electrodes.
3. Electrodeposition: Due to electrophoresis, charged colloidal particles moving to the vicinity of the anode emit electrons in the template body, and are deposited in an insoluble state, and precipitated, and the paint film is formed at this time.
4, electroosmosis: under the action of electric field, the solid phase does not move, and the liquid phase moves. The electroosmosis causes the water content in the paint film to be gradually discharged to the outside of the coating film, and finally forms a dense paint film which is almost incapable of passing current, has a very low water content, and has a relatively high electrical resistance.
5, iron red epoxy electrophoresis paint as an example: the electrophoretic paint is modified epoxy resin, butanol, ethanolamine, talc powder, iron red material composition, electrophoretic paint mixed with distilled water, under the action of DC electric field, ie Separation into positively charged cations and negatively charged anions, and a series of complex physical and chemical colloidal chemistry, electrochemical changes.
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