What are the surface treatment processes for zinc alloy die-cast bag accessories?
Release Time : 2025-03-06
There are various surface treatment processes for zinc alloy die-cast bag accessories, which are designed to enhance their aesthetics, corrosion resistance and durability.
Pickling is a common method for surface treatment of zinc alloy die-castings. By soaking zinc die-castings in acidic solutions such as nitric acid, phosphoric acid, and sulfuric acid, the oxides and impurities on the surface can be effectively removed and the surface finish can be improved. The surface of zinc alloy die-castings after pickling is smoother, which is conducive to subsequent processing and painting.
Electroplating is another important method for surface treatment of zinc alloy die-castings. By plating a layer of metal film such as chromium, nickel, zinc, etc. on the surface of zinc die-castings, the corrosion resistance and aesthetics of the castings can be significantly improved. Before electroplating, the surface of the casting needs to be pre-treated to ensure good surface quality without looseness, cracks and other undesirable phenomena. After electroplating, zinc alloy die-castings not only have a metallic luster, but also effectively resist corrosion and wear.
Mechanical polishing is to use sanding belts, grinding wheels or polishing machines to remove the unevenness and roughness of the surface of zinc die-castings and improve the surface finish. Sandblasting, on the other hand, uses mechanical shot blasting to treat the surface of zinc alloy castings into a textured or hemp sand surface to enhance the texture and aesthetics of the castings. Both methods can significantly improve the appearance quality of zinc alloy die castings.
Spraying is a large-area coating method for surface treatment of zinc alloy die castings. The corrosion resistance and protective effect of castings can be significantly improved by forming a protective layer through spraying or coating. Epoxy resin, polyurethane and acrylic are common spray coatings. Before spraying, the surface of the casting needs to be cleaned and pretreated to ensure that the coating can be evenly attached to the surface of the casting. Sprayed zinc alloy die castings not only have a beautiful appearance, but also effectively resist corrosion and wear.
Chemical film-forming treatment, such as chromate treatment, can form a protective film on the surface of zinc alloy die castings to improve the corrosion resistance and aesthetics of the product. This treatment method forms a dense oxide film on the surface of the casting through chemical reaction, which effectively isolates the casting from the external environment, thereby extending the service life of the casting.
Electrostatic spraying is an efficient spraying method that can form a protective film for zinc alloy castings, making the surface of the castings smoother, more beautiful and more textured. Electrostatic spraying uses the principle of static electricity to evenly attach the paint to the surface of the casting to form a dense coating. This coating not only has excellent corrosion resistance and wear resistance, but also improves the beauty and texture of the casting.
In addition to the above common surface treatment processes, zinc alloy die-cast bag accessories can also be treated with metal wire drawing, anodizing and other surface treatment methods. Metal wire drawing is formed by grinding on the surface of zinc alloy die-castings to play a decorative role. Anodizing can form a dense oxide film on the surface of the casting, improving the corrosion resistance and hardness of the casting. These surface treatment methods can be selected and applied according to specific needs and product characteristics.
There are many surface treatment processes for zinc alloy die-cast bag accessories, and each process has its unique advantages and scope of application. When choosing a surface treatment process, it is necessary to comprehensively consider and select according to the specific needs and characteristics of the product.