Electrophoretic coating is a special coating film forming method. It is the most practical construction process for water-based coatings. It is water-soluble, non-toxic and easy to automate. So far, some foreign commercial vehicle companies have had many years of experience in cathodic electrophoretic coating of complete vehicles, and China's commercial vehicle industry started late in this respect, which has acquired disadvantages in the process, but with the large-scale passenger car of Xiamen Golden Brigade The emergence of the car cathodic electrophoresis technology production line broke the original old production process and gradually became the main route of the domestic bus industry. The transformation of a passenger car painting process has already begun.
Electrophoresis technology application
Electrophoretic coating was invented in the late 1930s, but the development of this technology and its application in industrial production was after 1963. In the 1960s, Ford Motor Company first applied electrophoretic coating technology to automotive primers.
Since the early 1980s, FAW and II have first introduced foreign cathodic electrophoretic coating technology, especially in the 1990s. Due to the establishment of passenger vehicle joint ventures and coating joint ventures, China's automotive coating technology and coating have been promoted. The materials have reached the world's advanced level. Cathodic electrophoresis technology is currently the coating process that must be applied to passenger cars and some light commercial vehicles, and its application in passenger cars has been improved day by day, but it is rarely used in domestic large passenger cars. Most large passenger cars still use traditional ones. The backward process of spraying the primer.
In January 2007, Xiamen Golden Brigade began construction of a large passenger bus full-immersion, step-by-step, complete vehicle (body + chassis frame) pretreatment and cathodic electrophoresis primer production line at Haishu Bus Production Base. This project has been widely concerned from the start of construction to completion and production. Many experts and users have come to Xiamen Golden Brigade for inspection and observation, and highly praised the technical content of this production line and the quality of the gold passenger car.
The cathodic electrophoresis technology was first applied to the sea lion and the Coster models produced by Xiamen Golden Brigade. With the successful launch of the cathodic electrophoresis line for the large passenger car on May 8, 2008, the full range of models of the Golden Brigade adopted this technology, which also made gold Brigade is at the forefront of the industry in the coating process of large passenger cars.
Detailed electrophoresis technology
The main structure of the passenger car is composed of steel welding. Corrosion of the steel structure will directly damage the main structure of the passenger car. Therefore, the overall quality of the steel structure directly affects the service life of the passenger car. For the user, the better the corrosion quality of the steel structure, the longer the service life of the purchased vehicle, which reduces the maintenance and maintenance costs of the vehicle. Therefore, the cathodic electrophoresis technology has become the best for international bus manufacturers. selected.
Cathodic electrophoresis technology includes pre-treatment, degreasing, water washing, surface conditioning, phosphating, water washing, pure water washing, electrophoresis, ultrafiltration washing, pure water washing and other more than 10 pre-treatment electrophoresis procedures. Compared with the spray primer process, the primer coated by electrophoresis technology is a paint film formed on the surface by electrochemical reaction of metal materials. It is denser than conventional spray, has stronger adhesion, and has superior salt tolerance. Fog, heat and humidity resistance, and its anti-corrosion ability is much higher than other types of primer.
Cathodic electrophoretic coating has uniform paint film, strong adhesion, good flatness and ductility during drying, and can obtain a smooth, smooth and uniform coating film appearance; high cathodic electrophoresis, greatly improving the body Corrosion resistance of inner cavity, nip seam, etc.; using ultrafiltration membrane technology, the paint liquid can be recovered, which can make the utilization rate of paint up to 98%; because the production process is automated, it has the direct labor cost and shortened Many advantages such as working time and improving production efficiency. The fully immersed construction method of vehicle electrophoresis can make electrophoresis of parts that are not easy to be painted in the body cavity and cracks. The salt spray resistance test exceeds 1000h, and the whole vehicle can guarantee no rust and perforation for 10 years, which greatly extends the whole. The service life of the car.
Although the cathodic electrophoresis process is much more complicated and more stringent than the traditional painting process, the mechanized automatic transfer system and the rational layout of the process enable fast and efficient flow production, greatly improving the productivity and coating quality.
In addition, cathodic electrophoresis has a clear advantage in environmental protection. Cathodic electrophoretic paint is a water-soluble paint with very low organic solvent content, safety is much higher than general paint, no fire hazard. This not only saves the expenses of fire prevention measures of the plant, but also achieves zero emissions, in line with the industrial policies advocated by the state for energy conservation and emission reduction, and clean production for the benefit of society.
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Label: Forming method Appearance of coating film Coating material Coating technology Electrophoresis technology
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