Corrosion-induced damage and wrinkling of the coating
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Wrinkling is one of the forms of coating failure. From the appearance of the coating, wrinkling means that the surface is not smooth and completely dry; rather, it has an uneven texture with slight bulges. Wrinkling occurs due to the rapid drying of the coating surface, while the rest of the coating has not yet dried completely, resulting in different expansion rates on the inside and outside of the coating. Furthermore, wrinkling may also occur if the previous coat on the water cooler coating has not dried completely before the next coat is applied, or when the solvent used in the next coat rapidly swells and softens the previous coating film. If too much coating is applied, wrinkling may also occur sometimes. At this point, if severe rusting occurs beneath the coating, it will result in a loss of adhesion to the substrate. To prevent wrinkling, the coating process should be standardized, attention should be paid to the interval between coatings, the thickness of each coat should be controlled, and the drying temperature during heat curing must be properly managed.
What causes wrinkling in coatings? Coating wrinkling means that the paint surface appears uneven after it dries, with slight bulges on the surface. This is usually because the paint surface dries too quickly, while the paint underneath has not dried completely, resulting in different rates of contraction on the inside and outside. Sometimes, if topcoat is applied too quickly before the primer has dried, or if the solvents in the new paint soften the still-dry primer, wrinkles can also occur. Applying too much paint can also cause this problem. If the surface beneath the paint is severely rusted, wrinkling can also cause the paint layer to peel off directly. To avoid this, construction must be carried out according to the specifications: control the thickness of each coat of paint, allow sufficient drying time, and if baking is used, the temperature must also be properly controlled. .