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- Film formation methods for electrophoretic coating
- 2023/4/13 Reading frequency:[838]
- Electrophoretic coating is a special method of film formation, which is a practical construction process for water-based coatings. It has the characteristics of water solubility, non-toxic, and easy automation control. So far, some foreign commercial vehicle companies have years of experience in cathodic electrophoretic coating of whole vehicles, while the commercial vehicle industry in China started relatively late in this field and has acquired disadvantages in this process. However, with the emergence of Xiamen Jinlv large passenger car cathodic electrophoretic technology production line, it has broken the original outdated production process and gradually become the main route of the domestic passenger car industry, A transformation in the painting process of passenger cars has already begun
Application of Electrophoresis Technology
Electrophoretic coating was invented in the late 1930s, but its development and application in industrial production were after 1963. In the 1960s, Ford Motor Company applied electrophoretic coating technology to automotive primers
Starting from the early 1980s, FAW and 2W first introduced cathodic electrophoresis from abroad. In the 1990s, due to the establishment of joint ventures in passenger cars and coatings, China's automotive coating technology and materials reached advanced levels. Cathodic electrophoresis technology is currently a coating process that must be applied to passenger cars and some light commercial vehicles, and its application in passenger cars has become increasingly perfect. However, it is rarely applied to large domestic buses, and most large buses still use the outdated traditional spraying primer process
In January 2007, Xiamen Jinlv began constructing a large-scale passenger car production line at the Haicang Bus Production Base, which includes full immersion, step-by-step, whole vehicle (body+chassis frame) pre-treatment, and cathodic electrophoretic primer. This project has received widespread attention from the start of construction to its completion and production. Many experts and users have come to Xiamen Jinlv for inspection and observation, and highly praised the technical content of this production line and the quality of Jinlv buses
Cathodic electrophoresis technology has long been applied to the Haishi and Coaster models produced by Xiamen Jinlv. With the successful production of the cathodic electrophoresis line for large passenger cars on May 8, 2008, Jinlv's entire series of models have adopted this technology, which has also led Jinlv in the field of painting technology for large passenger cars
Detailed explanation of electrophoresis technology
The main structure of the bus is composed of welded steel, and corrosion of the steel structure can directly damage the main structure of the bus. Therefore, the overall quality of the steel structure directly affects the service life of the bus. For users, the better the anti-corrosion quality of the steel structure, the longer the service life of the purchased vehicle, and the lower the later maintenance and repair costs of the vehicle. Therefore, cathodic electrophoresis technology has become the best choice for international mainstream bus production enterprises
Cathodic electrophoresis technology includes more than 10 pre-treatment and electrophoresis processes, including pre-treatment, degreasing, water washing, surface adjustment, phosphating, water washing, pure water washing, electrophoresis, ultrafiltration water washing, and pure water washing. Compared with the spray primer process, the primer coated with electrophoretic technology is a paint film formed on the surface by electrochemical reactions of metal materials, which is denser and has stronger adhesion than ordinary spraying. It also has strong salt spray resistance, moisture heat resistance, and corrosion resistance, which is much higher than other types of primers。
Due to the automation of the production process, cathodic electrophoresis has many advantages such as reducing direct labor costs, shortening operation time, and improving production efficiency. The full immersion construction method of whole vehicle electrophoresis enables the interior cavity, gaps and other parts that are not easy to paint to be electrophoretically coated. Its salt spray resistance test exceeds 1000 hours, and the whole vehicle can be guaranteed to be free from rust and perforation for 10 years, greatly extending its service life.
Although the cathodic electrophoretic process is much more complex and strictly managed than traditional paint spraying processes, through a mechanized automatic transmission system and reasonable arrangement of processes, rapid and efficient streamlined production can be achieved, greatly improving production capacity and coating quality.
In addition, cathodic electrophoresis technology has more obvious advantages in environmental protection. Cathodic electrophoretic paint is a water-soluble paint with extremely low organic solvent content, much higher safety than general paint, and no fire hazard. This not only saves the cost of factory fire prevention measures, but also achieves zero emissions, in line with the advocated industrial policies of energy conservation and emission reduction, clean production, and benefits society -
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