Custom Architectural Aluminum Extrusion Profiles

What methods are used in the sealing process used in the production of architectural aluminum extrusion profiles? How to ensure the anti-pollution, corrosion resistance and wear resistance of the oxide film?

In the production process of architectural aluminum extrusion profiles, the sealing process is an indispensable step after anodizing, which is directly related to the weather resistance, anti-pollution ability and overall durability of the oxide film. The sealing processes we use mainly include hot water sealing and nickel salt sealing. These two methods have their own advantages and can be flexibly selected according to the specific needs of the product and the preferences of customers.
Hot water sealing process: This process uses the high temperature of boiling water to cause physical and chemical changes in the pores in the oxide film to form a dense closed structure. The characteristics of hot water sealing are simple operation, relatively low cost, and can effectively seal most of the pores and improve the corrosion resistance of the oxide film. We ensure the uniformity and integrity of the pore closure by precisely controlling the sealing temperature and optimizing the sealing time, thereby improving the overall performance of the product.
Nickel salt sealing process: Compared with hot water sealing, nickel salt sealing can form a more dense and uniform sealing layer on the surface of the oxide film, providing stronger corrosion resistance and wear resistance. This process involves soaking anodized aluminum architectural profile in a specific solution, causing the nickel ions in the solution to react chemically with the oxide film to generate water-insoluble compounds that effectively seal the pores. We use advanced nickel salt sealing formulas, combined with precisely controlled process parameters such as pH, temperature, time, etc., to ensure the best sealing effect while avoiding problems such as surface contamination or uneven color that may be caused by improper treatment.
After ensuring the high-quality implementation of the sealing process, we further enhance the anti-pollution, corrosion resistance and wear resistance of the oxide film through the following technical means:
Optimize the anodizing process: Anodizing is a key step in forming an oxide film, which directly affects the subsequent sealing effect and the performance of the final product. We use high-purity aluminum as raw material, and generate an oxide film with uniform thickness and dense structure by precisely controlling parameters such as oxidation current density, electrolyte composition and temperature. This oxide film is not only highly corrosion-resistant, but also has excellent wear resistance and insulation, laying a solid foundation for subsequent sealing treatment.
Surface pretreatment: Before anodizing, we will conduct strict surface pretreatment on aluminum materials, including degreasing, rust removal, polishing and other steps to thoroughly remove pollutants and impurities on the surface, ensure that the oxide film can grow on a clean and uniform substrate, thereby improving the bonding strength and overall quality of the oxide film and the substrate.
High-quality post-sealing treatment: In addition to selecting a suitable sealing process, we also pay attention to post-sealing treatment, such as using cold water to remove surface residues, and then performing appropriate drying treatment to avoid secondary corrosion caused by residual moisture. In addition, we will also perform secondary processing on the sealed products according to customer needs, such as coloring treatment after anodizing, which not only enriches the color selection of the product, but also further enhances its decorativeness and weather resistance.
Advanced testing equipment and quality control: In order to ensure that the performance of each batch of products can meet the highest standards, we are equipped with the most advanced and complete testing equipment in the industry, including film thickness and paint film testers, metallographic microscopes, Vickers hardness testers, test flatness platforms, three-coordinate measuring machines, image measuring machines, etc. These equipment can accurately measure the thickness, hardness, flatness and geometric dimensions of the oxide film and other key indicators to ensure that the products meet the most stringent international standards and customer requirements. At the same time, we implement a strict quality control process. From the entry of raw materials to the delivery of finished products, each process is strictly inspected to ensure the reliability of the final product.