What is the surface treatment process of Environmental Protection Black Zinc Hexagonal Screw?

Before surface treatment, environmental protection black zinc hexagonal screws need to undergo strict cleaning and degreasing steps. This step is to remove oil, impurities and oxide layers on the surface of the screws to ensure that the coating can be evenly and firmly attached to the surface of the screws. The cleaning process usually includes immersion in alkaline or acidic solutions, as well as high-pressure water washing and ultrasonic cleaning to ensure thorough cleaning.

Next is galvanizing, which is the core link of the surface treatment of environmental protection black zinc hexagonal screws. Unlike traditional galvanizing processes, environmental protection black zinc plating uses a more environmentally friendly electrolyte formula during the electroplating process, reducing the emission of harmful substances. During galvanizing, the screws are immersed in an electrolyte containing zinc ions. Through the action of electric current, the zinc ions are reduced to metallic zinc on the surface of the screws to form a dense galvanized layer. This galvanized layer not only improves the corrosion resistance of the screws, but also provides a good foundation for subsequent black treatment.

After the galvanized layer is formed, the screws need to be black treated to obtain a unique black appearance. Black treatment is usually achieved by chemical conversion film, that is, a specific chemical solution is used to react with the zinc coating to form a stable black compound film on its surface. This step not only gives the screw a beautiful black appearance, but also further enhances its corrosion resistance. Environmentally friendly black zinc plating also pays attention to environmental protection during the black treatment process, ensuring that the chemical solution used meets environmental standards and reduces the impact on the environment.

After completing the black treatment, the environmentally friendly black zinc hexagonal screws must undergo a series of subsequent treatment steps, such as cleaning, drying and coating with protective oil, to consolidate the coating effect and improve its weather resistance. The screws will undergo a strict inspection procedure, including appearance inspection, dimensional measurement and performance testing, to ensure that their quality meets the standards.

The surface treatment process of environmentally friendly black zinc hexagonal screws is a complex and delicate process, which integrates multiple links such as cleaning, galvanizing, black treatment and subsequent treatment. Through this series of process treatments, the screws not only obtain excellent corrosion resistance and beauty, but also achieve environmentally friendly protection.