The surface coating of the galvanized sheet peels off and peels off. How to repair it?
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This post was last edited by Wang Wei2 on 2023-9-8 11:25. The surface coating of galvanized sheets peels off and peels off. How to repair it for the second time? The picture below is of a certain tower equipment. The surface was coated with polyurethane anti-corrosion paint. After less than a year of use, it started to peel off. What is the cause and how to select materials for repair?
The peeling and layering of the surface coating is caused by some reasons. There may be the following reasons:: 1. Improper treatment of the base material before painting, such as oil stains, rust, etc. on the base material. 2. Improper selection of coating formula or poor quality. 3. The construction process is incorrect, such as the paint is applied too thin and is not completely dry. In this case, you can perform the following repair steps: 1. Clean and remove aging coating: Completely remove the surface coating to ensure the substrate surface is clean and smooth. 2. Repair the base material: On damaged parts, repair the base material, such as filling in dents, eradicating bulges, etc. 3. Repaint: Choose an appropriate paint formula and good quality paint for recoating. Pay attention to the coating being evenly applied and the thickness meeting the requirements. 4.Construction operations: Follow the correct construction technology and operating requirements, including paint dilution ratio, coating method, drying time, etc. In summary, to repair coating peeling and layering problems, you need to first clean and remove the aged coating, repair the base material, recoat, and pay attention to the correctness of construction operations. At the same time, it is more important to choose suitable materials and follow correct construction procedures when selecting coatings to prevent similar problems from happening again. .