Electrophoresis Coating
Electrophoresis Coating is a coating method that uses an external electric field to make the particles such as pigments and resins suspended in the electrophoretic liquid directional migrate and deposit on the surface of the substrate of one of the electrodes.In this process, the workpiece (that is, the object to be coated) is immersed in the anode or cathodic electrophoretic paint bath, at this time, the charged paint particles will rush to the workpiece under the action of the electric field, and then settle on the workpiece.In this way, a continuous and dense paint film with a thickness that meets the standard requirements can be formed on the surface of the workpiece, so as to achieve the purpose of spraying.
1. Electrophoretic paint and applicable industries (workpieces)
In the electrophoretic process, special electrophoretic paint is required.Electrophoretic paint is a kind of organic coating, mainly composed of additives, resins and pigments, and its main solution is a small amount of organic solvent and water.Electrophoretic paint can be roughly divided into two categories: epoxy electrophoretic paint and acrylic and polyurethane electrophoretic paint.The former is mainly used in large-scale industrial enterprises, which have higher requirements for anti-corrosion and anti-rust. It has various colors such as black, gray, red, yellow, etc. It is mainly used in the automobile industry, bicycle industry, motorcycle industry, home appliance industry, etc. The electrophoretic paint film is Opaque color.The latter is mainly aimed at decorative workpieces, light industrial products that require beautiful appearance and less corrosion resistance, such as glasses, lighters, locks, lamps, stationery, stationery, stationery and jewelry hairpin industries. This electrophoretic paint film is transparent and compatible with various The combination of various color pastes can achieve colorful and bright effects in various electroplating processes.
2. Example of the advantages of electrophoretic paint coating
The electrophoretic paint film has the advantages of full, uniform, smooth and smooth coating. The hardness, adhesion, corrosion resistance, impact performance and permeability of the electrophoretic paint film are obviously superior to other coating processes; water-soluble paint is used and dissolved in water Medium, saving a lot of organic solvents, greatly reducing air pollution and environmental hazards, safe and hygienic, while avoiding the hidden danger of fire; high coating efficiency, small loss of coating, and the utilization rate of coating can reach 90% to 95%; Coating film Uniform thickness, strong adhesion, good coating quality, uniform and smooth paint film can be obtained on various parts of the workpiece, such as the inner layer, depressions, welds, etc., which solves the problem of coating complex shape workpieces by other coating methods; The production efficiency is high, and the construction can realize automatic continuous production, which greatly improves labor efficiency.
3.The main process and main process equipment of the electrophoresis process
The electrophoretic coating process generally consists of four main processes: pretreatment before coating, electrophoretic coating, cleaning after electrophoresis, and drying of electrophoretic coating film. The main equipment includes: (1) Tank body (2) Stirring circulation system (3) Electrode device (4) Paint liquid temperature adjustment device (5) Paint supply device (6) Ultrafiltration device (7) Ventilation device (8) Power supply device (9) Washing device after swimming (10) Paint storage device
