[China Aluminum Network] aluminum alloy production including casting, extrusion and oxidation three processes.
1. Casting is the first step in the production of aluminum. The main processes are: (1) Ingredients: According to the specific winning combination number required to be produced, the amount of each alloy component added is calculated and properly matched with various raw materials. (2) Smelting: The prepared raw materials are added into the smelting furnace according to the process requirements to be melted, and the impurities and gases in the melt are effectively removed through degassing and deslagging refining means. (3) Casting: The smelted aluminum liquid is cooled and cast into a variety of round cast rods under a certain casting process condition through a deep well casting system.
2. Extrusion: Extrusion is a means of forming a profile. First, molds were designed and manufactured according to the profiles of the profile products, and the heated round cast rods were extruded from the mold using an extruder. Commonly used grade 6063 alloy, when used in the extrusion also uses an air-cooled quenching process and artificial aging process to complete the heat treatment. Different brands of heat treatable alloys have different heat treatment regimes. After hardening, the W-20 Vickers hardness tester can be used for hardness testing.
3. Oxidation: Extrusion of aluminum alloy profiles, the corrosion resistance of the surface is not strong, must be surface treatment by anodizing to increase the aluminum corrosion resistance, wear resistance and appearance of the appearance. The main processes are: (1) Surface pretreatment: Chemical or physical methods are used to clean the surface of the profile, exposing the pure matrix to facilitate obtaining a complete and dense artificial oxide film. It is also possible to obtain a specular or matt (matte) surface by mechanical means. (2) Anodizing: After surface pretreatment of the profiles, anodization occurs on the surface of the substrate under certain process conditions to form a dense, porous, strong AL203 film layer. (3) Sealing: The pores of the pores of the porous oxide film formed after the anodization are closed, so that the oxide film is prevented from contamination, corrosion and abrasion resistance. The oxide film is colorless and transparent. By using the strong adsorption of the oxide film before sealing, some metal salts can be adsorbed and deposited in the film pores, which can make the appearance of the material besides the colors (silver white), such as: black, bronze, Gold and stainless steel and so on.