Brushing method is an early, simple, and traditional manual coating method that is easy to operate and flexible, and can be applied to any shape of object. In addition to dry and poorly leveling coatings, it can also be applied to various coatings. The brushing method can allow the coating to penetrate, penetrate the pores on the metal surface, and enhance the adhesion between the coating film and the metal. The disadvantages are high labor intensity, low work efficiency, and poor coating appearance.
Scraping coating is a method that cannot be used for car painting with a scraper, used for the coating of liquid coatings with high viscosity and high solid content for users. The common safety issues with coating during scraping operations are cracking, peeling, and flipping, and the thickness of the coating is also difficult to achieve uniformity.
Dip coating is also a traditional Chinese painting technique. This method can immerse the coated object in a tank containing paint, then remove it and let the excess paint drip back into the tank, or use various mechanical design methods to shake off the excess paint. This method has a high risk of solvent loss, which can easily lead to environmental air quality pollution. It is not suitable for volatile coatings, and the thickness of the coating is not easy to be uniform. It is generally used for equipment or workpieces with complex social structures.
For example, in chemical plants, some equipment, such as combined heat exchangers, can be constructed using the full immersion coating method because the inner tubes cannot be sprayed. Galvanized aluminum steel pipes are mainly used for petrochemical furnace pipes, various heat exchanger pipes, fractionation tower pipes, etc.
Spray coating is a coating process that sprays paint from a nozzle onto the surface of the object to be coated, and the paint flows from top to bottom to completely cover the surface of the object to form a coating film. This method uses simple equipment, is relatively easy to achieve mechanized production, is easy to operate, and has high production efficiency, but the coating is uneven or incomplete. The coating thickness is not easily uniform. Spray coating consumes more solvent than immersion coating, which can also cause pollution problems.
Spraying is the process of using compressed air from data to generate negative pressure at the nozzle of the spray gun, which sprays the coating out of the container through the nozzle and quickly enters the high-speed compressed air flow in China. This causes the coating liquid to rapidly develop and diffuse in the gas phase, and is dispersed into mist like particles that are sprayed onto the coated object, evenly spreading on the surface. This law requires the sprayed coating to have a relatively low viscosity. Often added as a diluent in coatings. The advantages of spraying method are uniform distribution of coating thickness, smooth appearance, and high production efficiency.
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