What are the causes of defects in the coating construction process
Coating construction is a key link in the field of industrial production and construction, which plays a very important role in protecting the substrate and enhancing the aesthetics. However, in the process of coating construction, there are often various defects, which affect the quality and performance of the coating.
Common defects in the process of coating construction In the process of coating construction, common defects include foaming, peeling, cracking, hanging, orange peel and other phenomena. These defects not only affect the aesthetics of the coating, but also reduce its protective performance and even lead to the failure of the coating.
Iii. Analysis of the causes of coating construction defects
1. The basic treatment before the coating construction is the basis for ensuring the quality of the coating. If the base is not handled properly, such as oil, moisture, rust, etc., it will lead to the adhesion between the coating and the base is reduced, and it is easy to flake and other defects.
2. Poor construction environment The construction environment has a great impact on the quality of the coating. Environmental factors such as humidity, temperature and air quality will affect the curing process of the coating. For example, in the construction of high temperature and high humidity environment, the coating is easy to bubble and crack; In the environment of poor air quality construction, the coating is prone to defects such as pinholes.
3. Improper selection of coatings The selection of coatings directly affects the quality of the coating. If the paint is not selected properly, such as type mismatch and poor quality, it will lead to various defects in the coating. In addition, improper ratio and dilution ratio of coatings can also lead to coating problems.
4. Construction process Improper construction process is a key factor affecting the quality of the coating. Such as spraying, rolling coating, brush coating and other process parameters are not properly controlled, will lead to coating flow, orange peel and other defects. In addition, improper control of coating thickness will also affect the quality of the coating. Too thick coating is prone to defects such as cracking and peeling, while too thin coating will affect its protective performance.
1. Strict base treatment to ensure that the base is clean, dry, no oil, no rust, and according to the actual situation for grinding, sandblasting and other treatment, improve the roughness of the base, enhance the adhesion of the coating and the base.
2. Control the construction environment During the construction process, we should pay attention to weather changes and avoid construction in high temperature and high humidity environment. At the same time, maintain good air quality and reduce the impact of pollutants such as dust.
3. Select the right paint according to the actual needs to choose the right type of paint and brand to ensure the quality of paint. At the same time, in strict accordance with the ratio and dilution ratio of the coating, to ensure that the performance of the coating is fully played.
4. Control the construction process Select the appropriate construction process according to the actual needs, and strictly control the process parameters. Such as spraying distance, rolling coating pressure, brush coating method, etc., to ensure coating quality. In addition, the thickness of the coating should be controlled to avoid being too thick or too thin.
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