In modern architectural decoration, home appliance manufacturing, and industrial equipment production, coated sheet is a commonly used sheet metal material due to its good corrosion resistance, decorative properties, and processing performance. It is widely used. However, in the actual application process, coated sheet metal often appears the phenomenon of 'blistering', which not only affects the appearance but may also reduce the service life and performance of the material. Therefore, how to effectively prevent the occurrence of blistering in the processing and use of coated sheet metal has become a focus of the industry.



One, The main reasons for the blistering of coated sheet



1. Improper surface treatment of the base material

The base layer of the coated sheet (such as cold-rolled steel plate, galvanized steel, etc.) must be treated with degreasing, phosphatizing, and passivation before coating. If the surface is not cleaned thoroughly or the treatment is uneven, it will lead to a decrease in the adhesion of the coating layer, causing blistering during subsequent processing or use.



2. Inadequate control of the coating process

Improper control of temperature, pressure, and time during the coating process may cause the bonding between the coating layer and the base material to be not firm, forming gaps and thus triggering the blistering phenomenon.



3. Excessive environmental humidity

If the humidity in the processing or storage environment is too high, moisture may seep into the space between the coating layer and the metal, causing local blistering when the temperature changes.



4. Physical damage during transportation and installation

Improper operation during handling or installation may cause local damage to the coating layer, which may also become a trigger for blistering.



Two, Countermeasures against blistering



1. Strengthen the quality control of base material pre-treatment

Ensure that the metal base material is thoroughly cleaned before coating, removing oil, rust, and other impurities. It is recommended to use advanced chemical treatment processes such as silane treatment and nano-coating to enhance surface adhesion.



2. Optimize the coating process parameters

Strictly control the temperature, time, and pressure during the coating process, adopt an automatic control system to ensure the stable quality of each batch of coated products. At the same time, choose appropriate adhesives and film materials to improve the bonding strength.



3. Improve the processing and storage environment

Keep the workshop dry, control the relative humidity below 60%, and reduce the impact of moisture on the coating layer. Avoid the coated sheet material contacting moisture or being exposed to direct sunlight during storage.



4. Standardize the handling and installation process

Use special tools during handling to avoid scratches or indentations; avoid excessive bending or striking during installation to reduce physical damage to the coating layer.



Three, Conclusion



The blistering problem of coated sheet metal is one of the key factors affecting its performance and service life. By improving the quality of pre-treatment of the base material, optimizing the coating process, strictly controlling the environmental conditions, and standardizing the operation procedures, this problem can be effectively avoided. Enterprises should establish a sound quality control system in the production and application process, eliminate the risk of blistering from the source, and ensure the stable performance and beautiful appearance of the products, meeting the customers' demand for high-quality materials.



Only through fine management at every link can the high quality and long service life of the coated sheet metal products truly be realized, and the continuous improvement of the overall technical level of the industry can be promoted.