The adhesion of powder coatings refers to the bonding strength between the coating and the substrate, and is one of the important indicators for evaluating the quality of coatings. There are many factors that affect the adhesion of powder coatings, mainly including the following aspects:
Substrate surface treatment: Substrate surface treatment can enhance the adhesion of coatings to substrates by improving surface roughness, cleaning, sandblasting, etc.
Substrate surface treatment: The adhesion of powder coatings is closely related to factors such as the cleanliness, smoothness, and roughness of the substrate surface. The presence of contaminants such as grease, dust, scale, rust, etc. on the surface of the substrate can have a negative effect on the adhesion of the coating. Therefore, it is necessary to properly clean and treat the surface of the substrate before painting, such as sandblasting, pickling, etc.
Coating conditions: The control of temperature, humidity and other conditions during coating can affect the adhesion of powder coatings.
The choice of coating process parameters will also affect the adhesion of the coating, such as spraying distance, spraying angle, coating thickness, etc. Excessive spraying distance will lead to poor powder fluidity, and incorrect spraying angle will also affect the uniformity and adhesion of the coating. Too much or too thin coating thickness will affect the adhesion, and the appropriate thickness should be selected according to the requirements of the substrate and the performance of the coating.
Coating formula: The proportion and type of different ingredients in the coating formula, additives, etc. will affect the coating adhesion.
The adhesion of powder coatings is affected by its own properties, such as particle shape, particle size distribution, glass transition temperature, curing reaction, etc. The shape and size of paint particles will affect their adhesion on the surface of the substrate. The finer the particle, the larger its surface area, and the easier it is to physically and chemically react with the surface of the substrate, thereby improving adhesion. At the same time, the speed and extent of the curing reaction will also affect the adhesion of the coating.
Coating Thickness: Excessive increase or decrease in coating thickness will affect coating adhesion.
Spraying process: The control of parameters such as spraying distance, Spray Gun angle, spraying speed and other parameters in the spraying process will also affect the adhesion of the coating.
Substrate Material: Substrate material also affects coating adhesion.
The adhesion of powder coatings is affected by many factors, which need to be considered and controlled comprehensively to ensure the quality and performance of the coating.
