Hey, folks! Today, let’s talk about the common defects in electrophoretic paint. This is a headache in the industrial sector, especially in the manufacturing of cars, appliances, and furniture. After all the hard work of electrophoresis, the surface of the product may have small pits, scratches, uneven color, or pinholes, making you feel like all your previous efforts were in vain. Although electrophoretic paint is great, operational or environmental changes can lead to defects. The most common defects fall into several categories:

　　Pinholes and bubbles: These look like small holes punctured by needles, sometimes accompanied by bubbles. This may be due to inadequate pretreatment, with residual oil, rust, or treatment solution on the surface, hindering the normal deposition of the paint film. It could also be due to impurities in the bath or insufficient agitation, preventing the gas from escaping in time.

　　Particles: Small particles appear on the surface of the paint film, affecting the appearance. This is mostly caused by poor filtration of the bath, bringing in impurities; or insufficient environmental cleanliness, with dust, flying insects, etc., falling into the bath; or possibly wear and tear from equipment shedding particles.

　　Sagging and orange peel: Sagging is when the paint film flows down like a waterfall in areas where it is too thick, and orange peel is when the surface is uneven, like an orange peel. This is usually related to excessive voltage, high bath temperature, slow lifting speed of the workpiece, or insufficient dripping time after exiting the bath.

　　Uneven color and gloss: The same workpiece or batch of products have inconsistent color depth and gloss. This may be due to uneven voltage distribution, inconsistent bath temperature or agitation leading to uneven paint film thickness, or baking conditions, paint film thickness, and surface defects affecting the result.

　　Poor adhesion: The paint film looks shiny, but it peels off with a light scratch. This is a serious problem, mostly caused by inadequate pretreatment, such as incomplete degreasing, poor quality or damage to the phosphating film, leading to poor adhesion between the paint film and the substrate. It could also be due to insufficient baking or rust on the workpiece.

　　Facing these defects, the key is prevention first and timely treatment. Strictly control the quality of pretreatment to ensure the cleanliness of the workpiece surface. Regularly check and maintain electrophoretic equipment, keep the bath clean, and control parameters such as temperature and pH value. Optimize process parameters to ensure uniform paint film. Strengthen on-site management to reduce dust and standardize operations.

　　In short, although there are many defects in electrophoretic paint, understanding the causes and doing a good job in prevention and control can reduce these “face” problems and let the product wear a perfect protective coat". If you have encountered special defects in electrophoretic paint, please share your stories and experiences in the comments section, and let’s learn from each other!