The solution to the problem of paint film peeling caused by poor adhesion of metal hardware paint can be divided into two main steps: first, we need to understand the reasons for the paint loss of metal spray paint, and then find ways to enhance adhesion for these reasons.
The main reasons for metal paint peeling may include the following:
1.Insufficient surface pretreatment: Oil, oxide layer, rust, etc. on the metal surface will affect the adhesion of the paint layer. Before painting, it is important to ensure that the metal surface is clean and smooth, free of oil or other impurities.
2.Painting process problems: improper setting of pressure, distance, angle and other parameters during painting may lead to a decrease in the adhesion of the paint layer. The pressure, distance and angle of the spray gun need to be adjusted to ensure that the paint layer is uniform and dense.
3.Paint quality issues: If the paint used is of poor quality, or has expired, then its adhesion will also be greatly reduced. It is necessary to use a paint of reliable quality and ensure that it is used within the expiration date.
4.Metal surface properties: Some metal surfaces, such as aluminum, zinc, etc., may inherently difficult to adhere to paint. In this case, a targeted primer or a special painting process is required to enhance the adhesion.
For the above reasons, we can find the following ways to enhance the adhesion of metal spray paint:
1.Deepen surface pretreatment: Use sandpaper, sander and other tools to remove oxide and rust from the metal surface to ensure that the surface is clean and smooth. Detergents or solvents are then used to remove the oil from the surface, and it is allowed to dry before painting.
2.Optimize the painting process: adjust the pressure, distance and angle of the spray gun according to the characteristics of the metal surface and the nature of the paint to find the best spraying parameters. You can also try multiple sprays to increase the thickness and adhesion of the paint layer.
3.Use adhesion enhancement paints: There are specialized adhesion enhancement paints that can form a chemical bond between the paint layer and the metal surface, which can improve adhesion. You can consult a professional paint seller or manufacturer to choose the right paint for adhesion enhancement.
4.Use a targeted primer: For metal surfaces that are difficult to adhere to, you can try to use a targeted primer, such as a special primer for metals such as aluminum and zinc. These primers can form a high adhesion base layer on the metal surface, providing a better adhesion base for the upper paint layer.
5.Use other spraying techniques: If none of the above methods can solve the problem, you can consider using other spraying techniques, such as electrostatic spraying, fluidized bed spraying, etc. These technologies can provide greater paint adhesion, but may require higher equipment and operating costs.
6.Primer metal adhesion treatment agent: The metal adhesion treatment agent is sprayed on the surface of metal hardware material in the form of primer to enhance the wettability of the paint film on the metal surface and enhance the adhesion between the two, so that the paint film can be firmly adhered to the metal surface, the use method is simple and stable, compared with the traditional method, it is simple and easy to operate and has a high effect, which is a common solution.
Through the above solutions, we can effectively enhance the adhesion of metal paint and reduce the problem of paint peeling. However, it should be noted that each solution has its applicability and limitations, and you need to choose the most suitable solution according to the actual situation. At the same time, different metal hardware materials need different resistance testing after painting, and the selection and matching of metal adhesion treatment agents can be carried out according to different requirements.