In modern industrial production, coating is an indispensable part of the process. It not only affects the appearance of products but also directly influences their corrosion resistance, weather resistance, and service life. Among various coating technologies, electrophoretic painting (EDP) has become the mainstream process widely adopted in industries such as automobiles, home appliances, hardware, and building materials due to its excellent corrosion - resistant performance, high production efficiency, and good environmental protection characteristics. However, achieving ideal electrophoretic coating results is not easy, as it has strict technical requirements for the entire process. So, what are the key technical requirements for electrophoretic painting? Today, let’s delve into it.

　　First of all, electrophoretic painting technology has almost苛刻的要求 for the pre - treatment process. The quality of the electrophoretic coating largely depends on the cleanliness and activity of the workpiece surface. If the pre - treatment is not done well, even the highest - quality electrophoretic paint cannot adhere firmly, let alone provide corrosion protection. Therefore, a complete electrophoretic pre - treatment process usually includes degreasing, water washing, surface adjustment, derusting (for metal parts), water washing, phosphating (or passivation), and the final several water washes. Each step requires precise control of reagent concentration, temperature, time, and water quality. For example, incomplete degreasing can lead to poor paint film adhesion; poor phosphating film quality or contamination by impurities can affect the deposition and corrosion resistance of the electrophoretic paint. Especially the last…control is the key. This includes the temperature of the bath, electrophoretic voltage, electrophoretic time, anode - cathode area ratio, and bath agitation (air agitation or mechanical agitation). The temperature is usually controlled within a range of 1, excessive temperature can lead to the deterioration of the paint, while too low temperature can affect the throwing power. The electrophoretic voltage and time jointly determine the thickness of the paint film, which need to be precisely set according to the workpiece structure and requirements. Agitation is to ensure the uniformity of the bath composition, prevent precipitation, and ensure that the paint is evenly applied to all parts of the workpiece. At the same time, auxiliary equipment such as the electrodes, filters, heating / cooling systems in the electrophoretic tank also need to operate stably to ensure the accurate implementation of process parameters.

　　Finally, the post - treatment link cannot be ignored. After electrophoresis, the workpiece needs to be thoroughly rinsed with pure water to remove the floating paint on the surface, and then enter the baking and curing process. The baking temperature and time curve must be strictly carried out according to the recommended process of the electrophoretic paint to ensure that the paint film is fully cross - linked and cured, achieving the best physical and chemical properties. Too high temperature or too long time may cause yellowing and cracking of the paint film; too low temperature or too short time may lead to incomplete curing of the paint film and reduced performance.

　　In conclusion, the technical requirements for electrophoretic painting are a systematic project. From every detail of the pre - treatment, to the formula and stability of the electrophoretic paint itself, to the precise control of the electrophoretic process, and to the quality assurance of the post - treatment, every link is interlinked and indispensable. Only by strictly following these technical requirements can the quality of electrophoretic coating be ensured, providing reliable protection and an attractive appearance for products. For enterprises, understanding and mastering these technical requirements is an important guarantee for improving product competitiveness and achieving high - quality production.