With its excellent casting performance and moderate cost, Zamac is widely used in a lot of kinds of cap products, such as perfume bottles, which are often paired with Zamac caps. However, the problem of Zamac caps losing paint occurs from time to time, which not only affects the aesthetics but also may bring trouble to users. This article will discuss the causes of Zamac caps losing paint and put forward corresponding prevention and solutions.

Surface treatment is the key link to ensure that the coating and the Zamac substrate are tightly bonded, and if not handled properly, it is very likely to lead to loss of color and paint. In the production, processing, and storage process, the surface is easily stained with oil; these oils will form a layer of isolation between the coating and the substrate, so that the coating can not be firmly attached. At the same time, the surface of Zamac exposed to the air for a long time will react with oxygen and moisture to form a layer of oxidized film. This layer of oxidized film will also impede the adhesion of the coating, which will lead to the coating partially bulging and falling off in pieces.

Surface pre-treatment is a key step to ensure that the coating can firmly adhere to the Zamac substrate, and the process must be strictly followed. The first step is degreasing, using alkaline cleaning agents, such as sodium hydroxide solution, or organic solvents, such as alcohol, etc., to clean the surface of the Zamac cap, to completely remove the oil on the surface. Then it is necessary to remove the rust or oxidized layer. The use of dilute hydrochloric acid or phosphoric acid for pickling can effectively dissolve the oxide film on the surface, exposing the fresh Zamac substrate, to create good conditions for the adhesion of the coating.

During painting or plating, if the process parameters are not reasonable, such as too high or too low temperature, too long or too short time, and inappropriate concentration of paint, it will lead to problems in the coating. For example, the coating may be unevenly thin or thick and have pinholes. Such a coating has poor protective properties and will wear out and fade quickly after use. In addition, incomplete curing of the coating is also a common process problem; incompletely cured coatings have poor adhesion and are prone to color loss and paint loss.

According to the use scenario of the Zamac cap, it is crucial to choose the right coating material and process. The following are several common programs for perfume bottle caps, electrostatic painting, and electroplating. In the process of use, it is also necessary to do a good job of protection according to the characteristics of the environment. If the caps are used in humid environments, such as bathrooms, the plating process is preferred because its water resistance is superior to spray painting.

In short, the Zamac cap color loss and paint loss problem, the core is to ensure that the coating and the substrate of good adhesion, and the coating of the external environment of effective protection. Manufacturers in the production process to strictly control the surface pretreatment and coating process; users in the use of the process should also pay attention to avoid unfavorable use of the environment. As long as we do a good job in these areas, we can effectively reduce the occurrence of Zamac cap color loss and paint loss phenomenon, and improve the quality and service life of the product.