In the myriad colors of modern industry, electrophoretic coating holds a unique charm. It not only provides metal products with a tough protective film to resist the erosion of time but also brings a smooth, mirror-like visual effect, enhancing the overall quality of products. From the cars we drive every day to the indispensable home appliances in our homes, the presence of electrophoretic coating is ubiquitous. However, like any sophisticated process, electrophoretic coating is not always smooth sailing, and various problems often arise during the coating process. Today, let’s talk about those troublesome common problems in electrophoretic coating.

　　First and foremost, the most intuitive and most bothersome issue is surface defects.” This includes the previously mentioned rough surface, which feels unpleasant to the touch. There is also the orange peel phenomenon,” where the coating surface looks like the skin of an orange, with uneven bumps, affecting the aesthetic appearance. Even more annoying are pinholes” and bubbles,” these tiny holes not only damage the integrity of the coating but may also become the starting point for future corrosion. These problems are often related to the stability of the electrophoretic liquid, incomplete pre-treatment, improper baking conditions, and other factors, requiring careful investigation.

　　Secondly, the issue of coating uniformity” also frequently occurs. Ideally, the electrophoretic coating should be evenly applied to the surface of the workpiece. However, in actual operations, we may find uneven coating thickness.” For example, the coating on the edges and corners of the workpiece may be thicker, while the coating on the flat surfaces or recesses may be thinner. This is usually related to the distribution of the electric field, the hanging method of the workpiece, the temperature and solid content of the electrophoretic liquid, and other factors. Uneven coating thickness not only affects the appearance but also directly impacts the anti-corrosion performance. The thicker areas may waste materials, while the thinner areas may provide insufficient protection.

　　Furthermore, poor adhesion” is also a problem that cannot be ignored. If the electrophoretic coating does not adhere firmly to the substrate, peeling and blistering may occur during use, significantly shortening the service life of the product. Poor adhesion often stems from the pre-treatment process, such as incomplete degreasing, poor quality of the phosphating film, or the presence of water stains, all of which destroy the bond between the coating and the substrate, rendering the protective layer ineffective.

　　In addition, there are issues such as color deviation” and insufficient gloss.” The color of products in the same batch may vary in depth, or the gloss may not meet the expected standards. This not only affects the appearance but may also cause customers to doubt the quality of the product. This may be related to improper control of parameters such as the formula of the electrophoretic liquid, its aging degree, construction voltage, and baking time.

　　Facing these diverse common problems, we are not helpless. The key lies in establishing a sound quality control system, starting from the source, strictly controlling the quality of pre-treatment, finely managing the parameters of the electrophoretic process, and ensuring stable baking conditions. At the same time, strengthening daily tank liquid maintenance and testing to detect and solve potential problems in a timely manner. Electrophoretic coating is both a technical skill and an art of experience. Only through continuous learning and summarization can we effectively avoid these common problems and ensure that every product can be adorned with a perfect, tough, and beautiful outer layer.