Electrostatic powder coating most of the factors that affect adhesion are as follows:
1. Improper treatment of the sheet metal substrate before spraying, residual oil, water or release agent on the surface, and no suitable surface treatment on the surface of the metal material.
2. The surface of the sheet metal substrate is too smooth, resulting in poor adhesion of the spray powder on it.
3. The bottom coating is placed for too long, the recoating interval cycle is too long or the coating is baked excessively, which affects its own adhesion and interlayer bonding.
4. The coating is not completely dry or the powder is not evenly sprayed.
5. Substrate polarity low surface adsorption bottom, such as nylon, PP material, etc., need to be surface pretreatment process.
Corresponding to the poor adhesion organized a few solutions: 1:
1. Clean the surface of the substrate.
2. For the smooth surface of the spraying, the need for appropriate grinding treatment before spraying.
3. Improve the weather resistance and temperature change resistance of the powder, etc.
4. Strengthen the control of painting, control the construction process, control the proper film thickness and reduce the number of recoating.
5. Pre-treatment of the substrate, adhesion promoter can be used to improve the adhesion between the substrate and the coating.
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