What Causes Roughness on the Surface of Electrophoretic Paint?

Publication time:2024/12/24 Reading volume:45 Source: Shenzhen Zhibang Technology Co., Ltd
  Electrophoretic painting technology, as an integral part of modern coating processes, is widely used in various fields such as automobiles, home appliances, and construction. However, in practic...

  Electrophoretic painting technology, as an integral part of modern coating processes, is widely used in various fields such as automobiles, home appliances, and construction. However, in practical applications, the issue of roughness on the surface of electrophoretic paint often arises, which not only affects the aesthetic appeal of the product but may also reduce its corrosion resistance and service life. So, what factors cause roughness on the surface of electrophoretic paint?

  An excessively high pigment-to-binder ratio in the bath is a significant cause of roughness on the electrophoretic paint surface. The pigment-to-binder ratio, which refers to the proportion of pigment to resin, directly influences the deposition effect of electrophoretic paint and the quality of the paint film. When the pigment-to-binder ratio is too high, the distribution of pigment particles in the bath becomes uneven, leading to a granular roughness on the paint film surface. Therefore, reasonably controlling the pigment-to-binder ratio of the bath is crucial to avoiding roughness on the electrophoretic paint surface.

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  The cleanliness of the coated workpieces and hangers entering the electrophoretic bath also significantly affects the surface quality of the electrophoretic paint. If there are oil stains, dust, and other impurities on the workpiece surface, or if there are磷化渣 (phosphating residue) that has not been cleaned off the hangers, these impurities will adhere to the paint film during the electrophoretic process, forming a rough paint surface. Therefore, enhancing the pretreatment of workpieces and hangers to ensure a clean and contamination-free surface is an effective measure to prevent roughness on the electrophoretic paint surface.

  The filtration system of the electrophoretic bath is essential for maintaining the cleanliness of the bath and preventing the混入 (incorporation) of impurities. If filtration is inadequate, mechanical impurities, oil stains, and other contaminants in the bath cannot be effectively removed. These impurities will deposit on the workpiece surface during the electrophoretic process, leading to rough paint films. Therefore, regularly replacing filter bags, cleaning filter tanks, and ensuring the normal operation of the filtration system are important steps in maintaining the quality of the electrophoretic paint surface.

  Additionally, a low content of co-solvent in the bath may also cause roughness on the electrophoretic paint surface. Co-solvents play a role in adjusting the viscosity of the bath and promoting pigment dispersion during the electrophoretic process. When the co-solvent content is insufficient, the fluidity of the bath deteriorates, and pigment particles are prone to aggregation, affecting the smoothness of the paint film. Therefore, regularly testing the co-solvent content according to technical requirements and maintaining it within the control range are necessary measures to prevent roughness on the electrophoretic paint surface.

  The rinsing process after electrophoresis cannot be overlooked. If rinsing is insufficient or not performed as required, with steps such as UF1, UF2, and pure water rinsing, residual bath solution and impurities will form adherents on the workpiece surface, leading to rough paint films. Therefore, enhancing the rinsing process after electrophoresis to ensure no residues on the workpiece surface is a critical step in improving the quality of the electrophoretic paint surface.

  In summary, roughness on the surface of electrophoretic paint is the result of multiple factors acting together. To improve the surface quality of electrophoretic paint, it is necessary to address multiple aspects, including the control of the pigment-to-binder ratio in the bath, the cleanliness of workpieces and hangers, the filtration system of the electrophoretic bath, the content of co-solvent, and the rinsing process after electrophoresis. Only by comprehensively strengthening management and control in these areas can we ensure that electrophoretic paint products have excellent surface quality and long-term corrosion resistance.


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