In the modern industrial coating field, electrophoretic paint has become an indispensable coating in industries such as automobiles, machinery, and home appliances due to its excellent anti-corrosion properties and decorative effects. However, in practical applications, the problem of electrophoretic paint peeling off often troubles many enterprises. This not only affects the appearance quality of products but may also reduce the protective performance of products, causing considerable losses to enterprises. So, how should we deal with the problem of electrophoretic paint peeling off?

　　First of all, we need to start with the metal substrate. During the processing of metal workpieces, microstructural inhomogeneities may occur. For example, after hot rolling of die - castings, the surface may exhibit anisotropy. This difference will lead to uneven distribution of current density during the electrophoresis process, resulting in uneven film thickness. In addition, if there are impurities such as oil, rust, and welding slag on the substrate surface, they will hinder the uniform adhesion of electrophoretic paint. In the pre - treatment stage before electrophoresis, if the oil removal, rust removal, and phosphating processes are not handled properly, the remaining chemical substances or impurities will react with the electrophoretic paint, damaging the uniformity of the paint film and leading to peeling off. Therefore, before electrophoresis, the metal substrate must be strictly treated to ensure that the surface is clean, flat, without impurities and defects.

　　Process design and operation problems are also important factors leading to the peeling off of electrophoretic paint. The parameter setting of the electrophoresis tank liquid is a key link affecting the uniformity of the paint film. Voltage is the main driving force in the electrophoresis process. If the voltage setting is inappropriate, it will lead to uneven paint film thickness, which in turn is easy to peel off. The electrophoresis time, temperature, etc. also need to be strictly controlled. If the process parameters are not adjusted according to the actual situation of the workpiece, it will lead to uneven paint film formation. In addition, the operation skills of the operators are also crucial. If the operators lack experience and skills, they may not be able to operate the equipment properly, resulting in uneven coating. Therefore, enterprises should strengthen the training of operators to improve their operation skills.

　　Insufficient equipment maintenance and management can also lead to the peeling off of electrophoretic paint. The maintenance status of electrophoresis equipment is directly related to the quality of the paint film. If key components such as spray guns and nozzles are not cleaned and maintained for a long time, it will lead to nozzle blockage or uneven spraying, which in turn affects the uniformity of the paint film and makes the paint film easy to peel off. The cleanliness of the electrophoresis tank is also not to be ignored. If there are impurities or precipitates in the tank, they will contaminate the tank liquid and affect the quality of the paint film. Regularly cleaning the electrophoresis tank and removing impurities and precipitates in the tank are important measures to ensure the quality of the paint film.

　　The quality of the electrophoretic paint itself cannot be ignored. The quality stability of electrophoretic paint is the basis for ensuring the uniformity of the paint film. If the formula of the electrophoretic paint is unreasonable, and the proportion of pigments and resins is inappropriate, it may lead to a decrease in the physical properties and adhesion of the paint film, which in turn affects the uniformity of the paint film and causes peeling off. In addition, if the electrophoretic paint occurs layering, precipitation, and other phenomena during storage, it will lead to poor stability of the coating, and problems such as uneven color and particles will occur during coating, which will also make the paint film easy to peel off. Therefore, enterprises should choose high - quality, stable electrophoretic paint and manage it strictly according to the storage requirements.

　　In conclusion, the problem of electrophoretic paint peeling off is the result of the combined action of multiple factors. Enterprises should start from the aspects of metal substrate, process design and operation, equipment maintenance, and the quality of electrophoretic paint itself, strengthen quality control and equipment management in the production process, optimize process parameters, and choose high - quality electrophoretic paint products, so as to effectively solve the problem of electrophoretic paint peeling off and improve the quality and market competitiveness of products.